Freestyle Types (freestyle.types)

This module contains core classes of the Freestyle Python API, including data types of view map components (0D and 1D elements), base classes for user-defined line stylization rules (predicates, functions, chaining iterators, and stroke shaders), and operators.

Class hierarchy:

class freestyle.types.AdjacencyIterator

Class hierarchy: Iterator > AdjacencyIterator

Class for representing adjacency iterators used in the chaining process. An AdjacencyIterator is created in the increment() and decrement() methods of a ChainingIterator and passed to the traverse() method of the ChainingIterator.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (AdjacencyIterator) – An AdjacencyIterator object.

__init__(vertex, restrict_to_selection=True, restrict_to_unvisited=True)

Builds a AdjacencyIterator object.

Parameters

  • vertex (ViewVertex) – The vertex which is the next crossing.

  • restrict_to_selection (bool) – Indicates whether to force the chaining to stay within the set of selected ViewEdges or not.

  • restrict_to_unvisited (bool) – Indicates whether a ViewEdge that has already been chained must be ignored ot not.

is_incoming

True if the current ViewEdge is coming towards the iteration vertex, and False otherwise.

Type

bool

object

The ViewEdge object currently pointed to by this iterator.

Type

ViewEdge

class freestyle.types.BBox

Class for representing a bounding box.

__init__()

Default constructor.

class freestyle.types.BinaryPredicate0D

Base class for binary predicates working on Interface0D objects. A BinaryPredicate0D is typically an ordering relation between two Interface0D objects. The predicate evaluates a relation between the two Interface0D instances and returns a boolean value (true or false). It is used by invoking the __call__() method.

__init__()

Default constructor.

__call__(inter1, inter2)

Must be overload by inherited classes. It evaluates a relation between two Interface0D objects.

Parameters

  • inter1 (Interface0D) – The first Interface0D object.

  • inter2 (Interface0D) – The second Interface0D object.

Returns

True or false.

Return type

bool

name

The name of the binary 0D predicate.

Type

str

class freestyle.types.BinaryPredicate1D

Base class for binary predicates working on Interface1D objects. A BinaryPredicate1D is typically an ordering relation between two Interface1D objects. The predicate evaluates a relation between the two Interface1D instances and returns a boolean value (true or false). It is used by invoking the __call__() method.

__init__()

Default constructor.

__call__(inter1, inter2)

Must be overload by inherited classes. It evaluates a relation between two Interface1D objects.

Parameters

  • inter1 (Interface1D) – The first Interface1D object.

  • inter2 (Interface1D) – The second Interface1D object.

Returns

True or false.

Return type

bool

name

The name of the binary 1D predicate.

Type

str

class freestyle.types.Chain

Class hierarchy: Interface1D > Curve > Chain

Class to represent a 1D elements issued from the chaining process. A Chain is the last step before the Stroke and is used in the Splitting and Creation processes.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (Chain) – A Chain object.

__init__(id)

Builds a chain from its Id.

Parameters

id (Id) – An Id object.

push_viewedge_back(viewedge, orientation)

Adds a ViewEdge at the end of the Chain.

Parameters

  • viewedge (ViewEdge) – The ViewEdge that must be added.

  • orientation (bool) – The orientation with which the ViewEdge must be processed.

push_viewedge_front(viewedge, orientation)

Adds a ViewEdge at the beginning of the Chain.

Parameters

  • viewedge (ViewEdge) – The ViewEdge that must be added.

  • orientation (bool) – The orientation with which the ViewEdge must be processed.

class freestyle.types.ChainingIterator

Class hierarchy: Iterator > ViewEdgeIterator > ChainingIterator

Base class for chaining iterators. This class is designed to be overloaded in order to describe chaining rules. It makes the description of chaining rules easier. The two main methods that need to overloaded are traverse() and init(). traverse() tells which ViewEdge to follow, among the adjacent ones. If you specify restriction rules (such as “Chain only ViewEdges of the selection”), they will be included in the adjacency iterator (i.e, the adjacent iterator will only stop on “valid” edges).

__init__(restrict_to_selection=True, restrict_to_unvisited=True, begin=None, orientation=True)

Builds a Chaining Iterator from the first ViewEdge used for iteration and its orientation.

Parameters

  • restrict_to_selection (bool) – Indicates whether to force the chaining to stay within the set of selected ViewEdges or not.

  • restrict_to_unvisited (bool) – Indicates whether a ViewEdge that has already been chained must be ignored ot not.

  • begin (ViewEdge or None) – The ViewEdge from which to start the chain.

  • orientation (bool) – The direction to follow to explore the graph. If true, the direction indicated by the first ViewEdge is used.

__init__(brother)

Copy constructor.

Parameters

brother (ChainingIterator) –

init()

Initializes the iterator context. This method is called each time a new chain is started. It can be used to reset some history information that you might want to keep.

traverse(it)

This method iterates over the potential next ViewEdges and returns the one that will be followed next. Returns the next ViewEdge to follow or None when the end of the chain is reached.

Parameters

it (AdjacencyIterator) – The iterator over the ViewEdges adjacent to the end vertex of the current ViewEdge. The adjacency iterator reflects the restriction rules by only iterating over the valid ViewEdges.

Returns

Returns the next ViewEdge to follow, or None if chaining ends.

Return type

ViewEdge or None

is_incrementing

True if the current iteration is an incrementation.

Type

bool

next_vertex

The ViewVertex that is the next crossing.

Type

ViewVertex

object

The ViewEdge object currently pointed by this iterator.

Type

ViewEdge

class freestyle.types.Curve

Class hierarchy: Interface1D > Curve

Base class for curves made of CurvePoints. SVertex is the type of the initial curve vertices. A Chain is a specialization of a Curve.

__init__()

Default Constructor.

__init__(brother)

Copy Constructor.

Parameters

brother (Curve) – A Curve object.

__init__(id)

Builds a Curve from its Id.

Parameters

id (Id) – An Id object.

push_vertex_back(vertex)

Adds a single vertex at the end of the Curve.

Parameters

vertex (SVertex or CurvePoint) – A vertex object.

push_vertex_front(vertex)

Adds a single vertex at the front of the Curve.

Parameters

vertex (SVertex or CurvePoint) – A vertex object.

is_empty

True if the Curve doesn’t have any Vertex yet.

Type

bool

segments_size

The number of segments in the polyline constituting the Curve.

Type

int

class freestyle.types.CurvePoint

Class hierarchy: Interface0D > CurvePoint

Class to represent a point of a curve. A CurvePoint can be any point of a 1D curve (it doesn’t have to be a vertex of the curve). Any Interface1D is built upon ViewEdges, themselves built upon FEdges. Therefore, a curve is basically a polyline made of a list of SVertex objects. Thus, a CurvePoint is built by linearly interpolating two SVertex instances. CurvePoint can be used as virtual points while querying 0D information along a curve at a given resolution.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (CurvePoint) – A CurvePoint object.

__init__(first_vertex, second_vertex, t2d)

Builds a CurvePoint from two SVertex objects and an interpolation parameter.

Parameters

  • first_vertex (SVertex) – The first SVertex.

  • second_vertex (SVertex) – The second SVertex.

  • t2d (float) – A 2D interpolation parameter used to linearly interpolate first_vertex and second_vertex.

__init__(first_point, second_point, t2d)

Builds a CurvePoint from two CurvePoint objects and an interpolation parameter.

Parameters

  • first_point (CurvePoint) – The first CurvePoint.

  • second_point (CurvePoint) – The second CurvePoint.

  • t2d (float) – The 2D interpolation parameter used to linearly interpolate first_point and second_point.

fedge

Gets the FEdge for the two SVertices that given CurvePoints consists out of. A shortcut for CurvePoint.first_svertex.get_fedge(CurvePoint.second_svertex).

Type

FEdge

first_svertex

The first SVertex upon which the CurvePoint is built.

Type

SVertex

second_svertex

The second SVertex upon which the CurvePoint is built.

Type

SVertex

t2d

The 2D interpolation parameter.

Type

float

class freestyle.types.CurvePointIterator

Class hierarchy: Iterator > CurvePointIterator

Class representing an iterator on a curve. Allows an iterating outside initial vertices. A CurvePoint is instantiated and returned through the .object attribute.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (CurvePointIterator) – A CurvePointIterator object.

__init__(step=0.0)

Builds a CurvePointIterator object.

Parameters

step (float) – A resampling resolution with which the curve is resampled. If zero, no resampling is done (i.e., the iterator iterates over initial vertices).

object

The CurvePoint object currently pointed by this iterator.

Type

CurvePoint

t

The curvilinear abscissa of the current point.

Type

float

u

The point parameter at the current point in the stroke (0 <= u <= 1).

Type

float

class freestyle.types.FEdge

Class hierarchy: Interface1D > FEdge

Base Class for feature edges. This FEdge can represent a silhouette, a crease, a ridge/valley, a border or a suggestive contour. For silhouettes, the FEdge is oriented so that the visible face lies on the left of the edge. For borders, the FEdge is oriented so that the face lies on the left of the edge. An FEdge can represent an initial edge of the mesh or runs across a face of the initial mesh depending on the smoothness or sharpness of the mesh. This class is specialized into a smooth and a sharp version since their properties slightly vary from one to the other.

FEdge()

Default constructor.

FEdge(brother)

Copy constructor.

Parameters

brother (FEdge) – An FEdge object.

FEdge(first_vertex, second_vertex)

Builds an FEdge going from the first vertex to the second.

Parameters

  • first_vertex (SVertex) – The first SVertex.

  • second_vertex (SVertex) – The second SVertex.

first_svertex

The first SVertex constituting this FEdge.

Type

SVertex

id

The Id of this FEdge.

Type

Id

is_smooth

True if this FEdge is a smooth FEdge.

Type

bool

nature

The nature of this FEdge.

Type

Nature

next_fedge

The FEdge following this one in the ViewEdge. The value is None if this FEdge is the last of the ViewEdge.

Type

FEdge

previous_fedge

The FEdge preceding this one in the ViewEdge. The value is None if this FEdge is the first one of the ViewEdge.

Type

FEdge

second_svertex

The second SVertex constituting this FEdge.

Type

SVertex

viewedge

The ViewEdge to which this FEdge belongs to.

Type

ViewEdge

class freestyle.types.FEdgeSharp

Class hierarchy: Interface1D > FEdge > FEdgeSharp

Class defining a sharp FEdge. A Sharp FEdge corresponds to an initial edge of the input mesh. It can be a silhouette, a crease or a border. If it is a crease edge, then it is borded by two faces of the mesh. Face a lies on its right whereas Face b lies on its left. If it is a border edge, then it doesn’t have any face on its right, and thus Face a is None.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (FEdgeSharp) – An FEdgeSharp object.

__init__(first_vertex, second_vertex)

Builds an FEdgeSharp going from the first vertex to the second.

Parameters

  • first_vertex (SVertex) – The first SVertex object.

  • second_vertex (SVertex) – The second SVertex object.

face_mark_left

The face mark of the face lying on the left of the FEdge.

Type

bool

face_mark_right

The face mark of the face lying on the right of the FEdge. If this FEdge is a border, it has no face on the right and thus this property is set to false.

Type

bool

material_index_left

The index of the material of the face lying on the left of the FEdge.

Type

int

material_index_right

The index of the material of the face lying on the right of the FEdge. If this FEdge is a border, it has no Face on its right and therefore no material.

Type

int

material_left

The material of the face lying on the left of the FEdge.

Type

Material

material_right

The material of the face lying on the right of the FEdge. If this FEdge is a border, it has no Face on its right and therefore no material.

Type

Material

normal_left

The normal to the face lying on the left of the FEdge.

Type

mathutils.Vector

normal_right

The normal to the face lying on the right of the FEdge. If this FEdge is a border, it has no Face on its right and therefore no normal.

Type

mathutils.Vector

class freestyle.types.FEdgeSmooth

Class hierarchy: Interface1D > FEdge > FEdgeSmooth

Class defining a smooth edge. This kind of edge typically runs across a face of the input mesh. It can be a silhouette, a ridge or valley, a suggestive contour.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (FEdgeSmooth) – An FEdgeSmooth object.

__init__(first_vertex, second_vertex)

Builds an FEdgeSmooth going from the first to the second.

Parameters

  • first_vertex (SVertex) – The first SVertex object.

  • second_vertex (SVertex) – The second SVertex object.

face_mark

The face mark of the face that this FEdge is running across.

Type

bool

material

The material of the face that this FEdge is running across.

Type

Material

material_index

The index of the material of the face that this FEdge is running across.

Type

int

normal

The normal of the face that this FEdge is running across.

Type

mathutils.Vector

class freestyle.types.Id

Class for representing an object Id.

__init__(first=0, second=0)

Build the Id from two numbers.

Parameters

  • first (int) – The first number.

  • second (int) – The second number.

__init__(brother)

Copy constructor.

Parameters

brother (Id) – An Id object.

first

The first number constituting the Id.

Type

int

second

The second number constituting the Id.

Type

int

class freestyle.types.IntegrationType

Class hierarchy: int > IntegrationType

Different integration methods that can be invoked to integrate into a single value the set of values obtained from each 0D element of an 1D element:

  • IntegrationType.MEAN: The value computed for the 1D element is the mean of the values obtained for the 0D elements.

  • IntegrationType.MIN: The value computed for the 1D element is the minimum of the values obtained for the 0D elements.

  • IntegrationType.MAX: The value computed for the 1D element is the maximum of the values obtained for the 0D elements.

  • IntegrationType.FIRST: The value computed for the 1D element is the first of the values obtained for the 0D elements.

  • IntegrationType.LAST: The value computed for the 1D element is the last of the values obtained for the 0D elements.

class freestyle.types.Interface0D

Base class for any 0D element.

__init__()

Default constructor.

get_fedge(inter)

Returns the FEdge that lies between this 0D element and the 0D element given as the argument.

Parameters

inter (Interface0D) – A 0D element.

Returns

The FEdge lying between the two 0D elements.

Return type

FEdge

id

The Id of this 0D element.

Type

Id

name

The string of the name of this 0D element.

Type

str

nature

The nature of this 0D element.

Type

Nature

point_2d

The 2D point of this 0D element.

Type

mathutils.Vector

point_3d

The 3D point of this 0D element.

Type

mathutils.Vector

projected_x

The X coordinate of the projected 3D point of this 0D element.

Type

float

projected_y

The Y coordinate of the projected 3D point of this 0D element.

Type

float

projected_z

The Z coordinate of the projected 3D point of this 0D element.

Type

float

class freestyle.types.Interface0DIterator

Class hierarchy: Iterator > Interface0DIterator

Class defining an iterator over Interface0D elements. An instance of this iterator is always obtained from a 1D element.

__init__(brother)

Copy constructor.

Parameters

brother (Interface0DIterator) – An Interface0DIterator object.

__init__(it)

Construct a nested Interface0DIterator that can be the argument of a Function0D.

Parameters

it (SVertexIterator, CurvePointIterator, or StrokeVertexIterator) – An iterator object to be nested.

at_last

True if the iterator points to the last valid element. For its counterpart (pointing to the first valid element), use it.is_begin.

Type

bool

object

The 0D object currently pointed to by this iterator. Note that the object may be an instance of an Interface0D subclass. For example if the iterator has been created from the vertices_begin() method of the Stroke class, the .object property refers to a StrokeVertex object.

Type

Interface0D or one of its subclasses.

t

The curvilinear abscissa of the current point.

Type

float

u

The point parameter at the current point in the 1D element (0 <= u <= 1).

Type

float

class freestyle.types.Interface1D

Base class for any 1D element.

__init__()

Default constructor.

points_begin(t=0.0)

Returns an iterator over the Interface1D points, pointing to the first point. The difference with vertices_begin() is that here we can iterate over points of the 1D element at a any given sampling. Indeed, for each iteration, a virtual point is created.

Parameters

t (float) – A sampling with which we want to iterate over points of this 1D element.

Returns

An Interface0DIterator pointing to the first point.

Return type

Interface0DIterator

points_end(t=0.0)

Returns an iterator over the Interface1D points, pointing after the last point. The difference with vertices_end() is that here we can iterate over points of the 1D element at a given sampling. Indeed, for each iteration, a virtual point is created.

Parameters

t (float) – A sampling with which we want to iterate over points of this 1D element.

Returns

An Interface0DIterator pointing after the last point.

Return type

Interface0DIterator

vertices_begin()

Returns an iterator over the Interface1D vertices, pointing to the first vertex.

Returns

An Interface0DIterator pointing to the first vertex.

Return type

Interface0DIterator

vertices_end()

Returns an iterator over the Interface1D vertices, pointing after the last vertex.

Returns

An Interface0DIterator pointing after the last vertex.

Return type

Interface0DIterator

id

The Id of this Interface1D.

Type

Id

length_2d

The 2D length of this Interface1D.

Type

float

name

The string of the name of the 1D element.

Type

str

nature

The nature of this Interface1D.

Type

Nature

time_stamp

The time stamp of the 1D element, mainly used for selection.

Type

int

class freestyle.types.Iterator

Base class to define iterators.

__init__()

Default constructor.

decrement()

Makes the iterator point the previous element.

increment()

Makes the iterator point the next element.

is_begin

True if the iterator points to the first element.

Type

bool

is_end

True if the iterator points to the last element.

Type

bool

name

The string of the name of this iterator.

Type

str

class freestyle.types.Material

Class defining a material.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (Material) – A Material object.

__init__(line, diffuse, ambient, specular, emission, shininess, priority)

Builds a Material from its line, diffuse, ambient, specular, emissive colors, a shininess coefficient and line color priority.

Parameters

  • line (mathutils.Vector, list or tuple of 4 float values) – The line color.

  • diffuse (mathutils.Vector, list or tuple of 4 float values) – The diffuse color.

  • ambient (mathutils.Vector, list or tuple of 4 float values) – The ambient color.

  • specular (mathutils.Vector, list or tuple of 4 float values) – The specular color.

  • emission (mathutils.Vector, list or tuple of 4 float values) – The emissive color.

  • shininess (float) – The shininess coefficient.

  • priority (int) – The line color priority.

ambient

RGBA components of the ambient color of the material.

Type

mathutils.Color

diffuse

RGBA components of the diffuse color of the material.

Type

mathutils.Vector

emission

RGBA components of the emissive color of the material.

Type

mathutils.Color

line

RGBA components of the line color of the material.

Type

mathutils.Vector

priority

Line color priority of the material.

Type

int

shininess

Shininess coefficient of the material.

Type

float

specular

RGBA components of the specular color of the material.

Type

mathutils.Vector

class freestyle.types.MediumType

Class hierarchy: int > MediumType

The different blending modes available to similate the interaction media-medium:

  • Stroke.DRY_MEDIUM: To simulate a dry medium such as Pencil or Charcoal.

  • Stroke.HUMID_MEDIUM: To simulate ink painting (color subtraction blending).

  • Stroke.OPAQUE_MEDIUM: To simulate an opaque medium (oil, spray…).

class freestyle.types.Nature

Class hierarchy: int > Nature

Different possible natures of 0D and 1D elements of the ViewMap.

Vertex natures:

  • Nature.POINT: True for any 0D element.

  • Nature.S_VERTEX: True for SVertex.

  • Nature.VIEW_VERTEX: True for ViewVertex.

  • Nature.NON_T_VERTEX: True for NonTVertex.

  • Nature.T_VERTEX: True for TVertex.

  • Nature.CUSP: True for CUSP.

Edge natures:

  • Nature.NO_FEATURE: True for non feature edges (always false for 1D elements of the ViewMap).

  • Nature.SILHOUETTE: True for silhouettes.

  • Nature.BORDER: True for borders.

  • Nature.CREASE: True for creases.

  • Nature.RIDGE: True for ridges.

  • Nature.VALLEY: True for valleys.

  • Nature.SUGGESTIVE_CONTOUR: True for suggestive contours.

  • Nature.MATERIAL_BOUNDARY: True for edges at material boundaries.

  • Nature.EDGE_MARK: True for edges having user-defined edge marks.

class freestyle.types.Noise

Class to provide Perlin noise functionalities.

__init__(seed = -1)

Builds a Noise object. Seed is an optional argument. The seed value is used as a seed for random number generation if it is equal to or greater than zero; otherwise, time is used as a seed.

Parameters

seed (int) – Seed for random number generation.

Undocumented, consider contributing.

smoothNoise1(v)

Returns a smooth noise value for a 1D element.

Parameters

v (float) – One-dimensional sample point.

Returns

A smooth noise value.

Return type

float

smoothNoise2(v)

Returns a smooth noise value for a 2D element.

Parameters

v (mathutils.Vector, list or tuple of 2 real numbers) – Two-dimensional sample point.

Returns

A smooth noise value.

Return type

float

smoothNoise3(v)

Returns a smooth noise value for a 3D element.

Parameters

v (mathutils.Vector, list or tuple of 3 real numbers) – Three-dimensional sample point.

Returns

A smooth noise value.

Return type

float

turbulence1(v, freq, amp, oct=4)

Returns a noise value for a 1D element.

Parameters

  • v (float) – One-dimensional sample point.

  • freq (float) – Noise frequency.

  • amp (float) – Amplitude.

  • oct (int) – Number of octaves.

Returns

A noise value.

Return type

float

turbulence2(v, freq, amp, oct=4)

Returns a noise value for a 2D element.

Parameters

  • v (mathutils.Vector, list or tuple of 2 real numbers) – Two-dimensional sample point.

  • freq (float) – Noise frequency.

  • amp (float) – Amplitude.

  • oct (int) – Number of octaves.

Returns

A noise value.

Return type

float

turbulence3(v, freq, amp, oct=4)

Returns a noise value for a 3D element.

Parameters

  • v (mathutils.Vector, list or tuple of 3 real numbers) – Three-dimensional sample point.

  • freq (float) – Noise frequency.

  • amp (float) – Amplitude.

  • oct (int) – Number of octaves.

Returns

A noise value.

Return type

float

Undocumented, consider contributing.

class freestyle.types.NonTVertex

Class hierarchy: Interface0D > ViewVertex > NonTVertex

View vertex for corners, cusps, etc. associated to a single SVertex. Can be associated to 2 or more view edges.

__init__()

Default constructor.

__init__(svertex)

Build a NonTVertex from a SVertex.

Parameters

svertex (SVertex) – An SVertex object.

svertex

The SVertex on top of which this NonTVertex is built.

Type

SVertex

class freestyle.types.Operators

Class defining the operators used in a style module. There are five types of operators: Selection, chaining, splitting, sorting and creation. All these operators are user controlled through functors, predicates and shaders that are taken as arguments.

static bidirectional_chain(it, pred)

Builds a set of chains from the current set of ViewEdges. Each ViewEdge of the current list potentially starts a new chain. The chaining operator then iterates over the ViewEdges of the ViewMap using the user specified iterator. This operator iterates both using the increment and decrement operators and is therefore bidirectional. This operator works with a ChainingIterator which contains the chaining rules. It is this last one which can be told to chain only edges that belong to the selection or not to process twice a ViewEdge during the chaining. Each time a ViewEdge is added to a chain, its chaining time stamp is incremented. This allows you to keep track of the number of chains to which a ViewEdge belongs to.

Parameters

  • it (ChainingIterator) – The ChainingIterator on the ViewEdges of the ViewMap. It contains the chaining rule.

  • pred (UnaryPredicate1D) – The predicate on the ViewEdge that expresses the stopping condition.

static bidirectional_chain(it)

The only difference with the above bidirectional chaining algorithm is that we don’t need to pass a stopping criterion. This might be desirable when the stopping criterion is already contained in the iterator definition. Builds a set of chains from the current set of ViewEdges. Each ViewEdge of the current list potentially starts a new chain. The chaining operator then iterates over the ViewEdges of the ViewMap using the user specified iterator. This operator iterates both using the increment and decrement operators and is therefore bidirectional. This operator works with a ChainingIterator which contains the chaining rules. It is this last one which can be told to chain only edges that belong to the selection or not to process twice a ViewEdge during the chaining. Each time a ViewEdge is added to a chain, its chaining time stamp is incremented. This allows you to keep track of the number of chains to which a ViewEdge belongs to.

Parameters

it (ChainingIterator) – The ChainingIterator on the ViewEdges of the ViewMap. It contains the chaining rule.

static chain(it, pred, modifier)

Builds a set of chains from the current set of ViewEdges. Each ViewEdge of the current list starts a new chain. The chaining operator then iterates over the ViewEdges of the ViewMap using the user specified iterator. This operator only iterates using the increment operator and is therefore unidirectional.

Parameters

  • it (ViewEdgeIterator) – The iterator on the ViewEdges of the ViewMap. It contains the chaining rule.

  • pred (UnaryPredicate1D) – The predicate on the ViewEdge that expresses the stopping condition.

  • modifier (UnaryFunction1DVoid) – A function that takes a ViewEdge as argument and that is used to modify the processed ViewEdge state (the timestamp incrementation is a typical illustration of such a modifier).

static chain(it, pred)

Builds a set of chains from the current set of ViewEdges. Each ViewEdge of the current list starts a new chain. The chaining operator then iterates over the ViewEdges of the ViewMap using the user specified iterator. This operator only iterates using the increment operator and is therefore unidirectional. This chaining operator is different from the previous one because it doesn’t take any modifier as argument. Indeed, the time stamp (insuring that a ViewEdge is processed one time) is automatically managed in this case.

Parameters

  • it (ViewEdgeIterator) – The iterator on the ViewEdges of the ViewMap. It contains the chaining rule.

  • pred (UnaryPredicate1D) – The predicate on the ViewEdge that expresses the stopping condition.

static create(pred, shaders)

Creates and shades the strokes from the current set of chains. A predicate can be specified to make a selection pass on the chains.

Parameters

  • pred (UnaryPredicate1D) – The predicate that a chain must verify in order to be transform as a stroke.

  • shaders (list of StrokeShader objects) – The list of shaders used to shade the strokes.

static get_chain_from_index(i)

Returns the Chain at the index in the current set of Chains.

Parameters

i (int) – index (0 <= i < Operators.get_chains_size()).

Returns

The Chain object.

Return type

Chain

static get_chains_size()

Returns the number of Chains.

Returns

The number of Chains.

Return type

int

static get_stroke_from_index(i)

Returns the Stroke at the index in the current set of Strokes.

Parameters

i (int) – index (0 <= i < Operators.get_strokes_size()).

Returns

The Stroke object.

Return type

Stroke

static get_strokes_size()

Returns the number of Strokes.

Returns

The number of Strokes.

Return type

int

static get_view_edges_size()

Returns the number of ViewEdges.

Returns

The number of ViewEdges.

Return type

int

static get_viewedge_from_index(i)

Returns the ViewEdge at the index in the current set of ViewEdges.

Parameters

i (int) – index (0 <= i < Operators.get_view_edges_size()).

Returns

The ViewEdge object.

Return type

ViewEdge

static recursive_split(func, pred_1d, sampling=0.0)

Splits the current set of chains in a recursive way. We process the points of each chain (with a specified sampling) to find the point minimizing a specified function. The chain is split in two at this point and the two new chains are processed in the same way. The recursivity level is controlled through a predicate 1D that expresses a stopping condition on the chain that is about to be processed.

Parameters

  • func (UnaryFunction0DDouble) – The Unary Function evaluated at each point of the chain. The splitting point is the point minimizing this function.

  • pred_1d (UnaryPredicate1D) – The Unary Predicate expressing the recursivity stopping condition. This predicate is evaluated for each curve before it actually gets split. If pred_1d(chain) is true, the curve won’t be split anymore.

  • sampling (float) – The resolution used to sample the chain for the predicates evaluation. (The chain is not actually resampled, a virtual point only progresses along the curve using this resolution.)

static recursive_split(func, pred_0d, pred_1d, sampling=0.0)

Splits the current set of chains in a recursive way. We process the points of each chain (with a specified sampling) to find the point minimizing a specified function. The chain is split in two at this point and the two new chains are processed in the same way. The user can specify a 0D predicate to make a first selection on the points that can potentially be split. A point that doesn’t verify the 0D predicate won’t be candidate in realizing the min. The recursivity level is controlled through a predicate 1D that expresses a stopping condition on the chain that is about to be processed.

Parameters

  • func (UnaryFunction0DDouble) – The Unary Function evaluated at each point of the chain. The splitting point is the point minimizing this function.

  • pred_0d (UnaryPredicate0D) – The Unary Predicate 0D used to select the candidate points where the split can occur. For example, it is very likely that would rather have your chain splitting around its middle point than around one of its extremities. A 0D predicate working on the curvilinear abscissa allows to add this kind of constraints.

  • pred_1d (UnaryPredicate1D) – The Unary Predicate expressing the recursivity stopping condition. This predicate is evaluated for each curve before it actually gets split. If pred_1d(chain) is true, the curve won’t be split anymore.

  • sampling (float) – The resolution used to sample the chain for the predicates evaluation. (The chain is not actually resampled; a virtual point only progresses along the curve using this resolution.)

static reset(delete_strokes=True)

Resets the line stylization process to the initial state. The results of stroke creation are accumulated if delete_strokes is set to False.

Parameters

delete_strokes (bool) – Delete the strokes that are currently stored.

static select(pred)

Selects the ViewEdges of the ViewMap verifying a specified condition.

Parameters

pred (UnaryPredicate1D) – The predicate expressing this condition.

static sequential_split(starting_pred, stopping_pred, sampling=0.0)

Splits each chain of the current set of chains in a sequential way. The points of each chain are processed (with a specified sampling) sequentially. Each time a user specified starting condition is verified, a new chain begins and ends as soon as a user-defined stopping predicate is verified. This allows chains overlapping rather than chains partitioning. The first point of the initial chain is the first point of one of the resulting chains. The splitting ends when no more chain can start.

Parameters

  • starting_pred (UnaryPredicate0D) – The predicate on a point that expresses the starting condition.

  • stopping_pred (UnaryPredicate0D) – The predicate on a point that expresses the stopping condition.

  • sampling (float) – The resolution used to sample the chain for the predicates evaluation. (The chain is not actually resampled; a virtual point only progresses along the curve using this resolution.)

static sequential_split(pred, sampling=0.0)

Splits each chain of the current set of chains in a sequential way. The points of each chain are processed (with a specified sampling) sequentially and each time a user specified condition is verified, the chain is split into two chains. The resulting set of chains is a partition of the initial chain

Parameters

  • pred (UnaryPredicate0D) – The predicate on a point that expresses the splitting condition.

  • sampling (float) – The resolution used to sample the chain for the predicate evaluation. (The chain is not actually resampled; a virtual point only progresses along the curve using this resolution.)

static sort(pred)

Sorts the current set of chains (or viewedges) according to the comparison predicate given as argument.

Parameters

pred (BinaryPredicate1D) – The binary predicate used for the comparison.

class freestyle.types.SShape

Class to define a feature shape. It is the gathering of feature elements from an identified input shape.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (SShape) – An SShape object.

add_edge(edge)

Adds an FEdge to the list of FEdges.

Parameters

edge (FEdge) – An FEdge object.

add_vertex(vertex)

Adds an SVertex to the list of SVertex of this Shape. The SShape attribute of the SVertex is also set to this SShape.

Parameters

vertex (SVertex) – An SVertex object.

compute_bbox()

Compute the bbox of the SShape.

bbox

The bounding box of the SShape.

Type

BBox

edges

The list of edges constituting this SShape.

Type

List of FEdge objects

id

The Id of this SShape.

Type

Id

name

The name of the SShape.

Type

str

vertices

The list of vertices constituting this SShape.

Type

List of SVertex objects

class freestyle.types.SVertex

Class hierarchy: Interface0D > SVertex

Class to define a vertex of the embedding.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (SVertex) – A SVertex object.

__init__(point_3d, id)

Builds a SVertex from 3D coordinates and an Id.

Parameters
add_fedge(fedge)

Add an FEdge to the list of edges emanating from this SVertex.

Parameters

fedge (FEdge) – An FEdge.

add_normal(normal)

Adds a normal to the SVertex’s set of normals. If the same normal is already in the set, nothing changes.

Parameters

normal (mathutils.Vector, list or tuple of 3 real numbers) – A three-dimensional vector.

curvatures

Curvature information expressed in the form of a seven-element tuple (K1, e1, K2, e2, Kr, er, dKr), where K1 and K2 are scalar values representing the first (maximum) and second (minimum) principal curvatures at this SVertex, respectively; e1 and e2 are three-dimensional vectors representing the first and second principal directions, i.e. the directions of the normal plane where the curvature takes its maximum and minimum values, respectively; and Kr, er and dKr are the radial curvature, radial direction, and the derivative of the radial curvature at this SVertex, respectively.

Type

tuple

id

The Id of this SVertex.

Type

Id

normals

The normals for this Vertex as a list. In a sharp surface, an SVertex has exactly one normal. In a smooth surface, an SVertex can have any number of normals.

Type

list of mathutils.Vector objects

normals_size

The number of different normals for this SVertex.

Type

int

point_2d

The projected 3D coordinates of the SVertex.

Type

mathutils.Vector

point_3d

The 3D coordinates of the SVertex.

Type

mathutils.Vector

viewvertex

If this SVertex is also a ViewVertex, this property refers to the ViewVertex, and None otherwise.

Type

ViewVertex

class freestyle.types.SVertexIterator

Class hierarchy: Iterator > SVertexIterator

Class representing an iterator over SVertex of a ViewEdge. An instance of an SVertexIterator can be obtained from a ViewEdge by calling verticesBegin() or verticesEnd().

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (SVertexIterator) – An SVertexIterator object.

__init__(vertex, begin, previous_edge, next_edge, t)

Build an SVertexIterator that starts iteration from an SVertex object v.

Parameters

  • vertex (SVertex) – The SVertex from which the iterator starts iteration.

  • begin (SVertex) – The first SVertex of a ViewEdge.

  • previous_edge (FEdge) – The previous FEdge coming to vertex.

  • next_edge (FEdge) – The next FEdge going out from vertex.

  • t (float) – The curvilinear abscissa at vertex.

object

The SVertex object currently pointed by this iterator.

Type

SVertex

t

The curvilinear abscissa of the current point.

Type

float

u

The point parameter at the current point in the 1D element (0 <= u <= 1).

Type

float

class freestyle.types.Stroke

Class hierarchy: Interface1D > Stroke

Class to define a stroke. A stroke is made of a set of 2D vertices (StrokeVertex), regularly spaced out. This set of vertices defines the stroke’s backbone geometry. Each of these stroke vertices defines the stroke’s shape and appearance at this vertex position.

Stroke()

Default constructor

Stroke(brother)

Copy constructor

compute_sampling(n)

Compute the sampling needed to get N vertices. If the specified number of vertices is less than the actual number of vertices, the actual sampling value is returned. (To remove Vertices, use the RemoveVertex() method of this class.)

Parameters

n (int) – The number of stroke vertices we eventually want in our Stroke.

Returns

The sampling that must be used in the Resample(float) method.

Return type

float

insert_vertex(vertex, next)

Inserts the StrokeVertex given as argument into the Stroke before the point specified by next. The length and curvilinear abscissa are updated consequently.

Parameters

  • vertex (StrokeVertex) – The StrokeVertex to insert in the Stroke.

  • next (StrokeVertexIterator) – A StrokeVertexIterator pointing to the StrokeVertex before which vertex must be inserted.

remove_all_vertices()

Removes all vertices from the Stroke.

remove_vertex(vertex)

Removes the StrokeVertex given as argument from the Stroke. The length and curvilinear abscissa are updated consequently.

Parameters

vertex (StrokeVertex) – the StrokeVertex to remove from the Stroke.

resample(n)

Resamples the stroke so that it eventually has N points. That means it is going to add N-vertices_size, where vertices_size is the number of points we already have. If vertices_size >= N, no resampling is done.

Parameters

n (int) – The number of vertices we eventually want in our stroke.

resample(sampling)

Resamples the stroke with a given sampling. If the sampling is smaller than the actual sampling value, no resampling is done.

Parameters

sampling (float) – The new sampling value.

stroke_vertices_begin(t=0.0)

Returns a StrokeVertexIterator pointing on the first StrokeVertex of the Stroke. One can specify a sampling value to re-sample the Stroke on the fly if needed.

Parameters

t (float) – The resampling value with which we want our Stroke to be resampled. If 0 is specified, no resampling is done.

Returns

A StrokeVertexIterator pointing on the first StrokeVertex.

Return type

StrokeVertexIterator

stroke_vertices_end()

Returns a StrokeVertexIterator pointing after the last StrokeVertex of the Stroke.

Returns

A StrokeVertexIterator pointing after the last StrokeVertex.

Return type

StrokeVertexIterator

stroke_vertices_size()

Returns the number of StrokeVertex constituting the Stroke.

Returns

The number of stroke vertices.

Return type

int

update_length()

Updates the 2D length of the Stroke.

id

The Id of this Stroke.

Type

Id

length_2d

The 2D length of the Stroke.

Type

float

medium_type

The MediumType used for this Stroke.

Type

MediumType

texture_id

The ID of the texture used to simulate th marks system for this Stroke.

Type

int

tips

True if this Stroke uses a texture with tips, and false otherwise.

Type

bool

class freestyle.types.StrokeAttribute

Class to define a set of attributes associated with a StrokeVertex. The attribute set stores the color, alpha and thickness values for a Stroke Vertex.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (StrokeAttribute) – A StrokeAttribute object.

__init__(red, green, blue, alpha, thickness_right, thickness_left)

Build a stroke vertex attribute from a set of parameters.

Parameters

  • red (float) – Red component of a stroke color.

  • green (float) – Green component of a stroke color.

  • blue (float) – Blue component of a stroke color.

  • alpha (float) – Alpha component of a stroke color.

  • thickness_right (float) – Stroke thickness on the right.

  • thickness_left (float) – Stroke thickness on the left.

__init__(attribute1, attribute2, t)

Interpolation constructor. Build a StrokeAttribute from two StrokeAttribute objects and an interpolation parameter.

Parameters

  • attribute1 (StrokeAttribute) – The first StrokeAttribute object.

  • attribute2 (StrokeAttribute) – The second StrokeAttribute object.

  • t (float) – The interpolation parameter (0 <= t <= 1).

get_attribute_real(name)

Returns an attribute of float type.

Parameters

name (str) – The name of the attribute.

Returns

The attribute value.

Return type

float

get_attribute_vec2(name)

Returns an attribute of two-dimensional vector type.

Parameters

name (str) – The name of the attribute.

Returns

The attribute value.

Return type

mathutils.Vector

get_attribute_vec3(name)

Returns an attribute of three-dimensional vector type.

Parameters

name (str) – The name of the attribute.

Returns

The attribute value.

Return type

mathutils.Vector

has_attribute_real(name)

Checks whether the attribute name of float type is available.

Parameters

name (str) – The name of the attribute.

Returns

True if the attribute is available.

Return type

bool

has_attribute_vec2(name)

Checks whether the attribute name of two-dimensional vector type is available.

Parameters

name (str) – The name of the attribute.

Returns

True if the attribute is available.

Return type

bool

has_attribute_vec3(name)

Checks whether the attribute name of three-dimensional vector type is available.

Parameters

name (str) – The name of the attribute.

Returns

True if the attribute is available.

Return type

bool

set_attribute_real(name, value)

Adds a user-defined attribute of float type. If there is no attribute of the given name, it is added. Otherwise, the new value replaces the old one.

Parameters

  • name (str) – The name of the attribute.

  • value (float) – The attribute value.

set_attribute_vec2(name, value)

Adds a user-defined attribute of two-dimensional vector type. If there is no attribute of the given name, it is added. Otherwise, the new value replaces the old one.

Parameters

  • name (str) – The name of the attribute.

  • value (mathutils.Vector, list or tuple of 2 real numbers) – The attribute value.

set_attribute_vec3(name, value)

Adds a user-defined attribute of three-dimensional vector type. If there is no attribute of the given name, it is added. Otherwise, the new value replaces the old one.

Parameters

  • name (str) – The name of the attribute.

  • value (mathutils.Vector, list or tuple of 3 real numbers) – The attribute value.

alpha

Alpha component of the stroke color.

Type

float

color

RGB components of the stroke color.

Type

mathutils.Color

thickness

Right and left components of the stroke thickness. The right (left) component is the thickness on the right (left) of the vertex when following the stroke.

Type

mathutils.Vector

visible

The visibility flag. True if the StrokeVertex is visible.

Type

bool

class freestyle.types.StrokeShader

Base class for stroke shaders. Any stroke shader must inherit from this class and overload the shade() method. A StrokeShader is designed to modify stroke attributes such as thickness, color, geometry, texture, blending mode, and so on. The basic way for this operation is to iterate over the stroke vertices of the Stroke and to modify the StrokeAttribute of each vertex. Here is a code example of such an iteration:

it = ioStroke.strokeVerticesBegin()
while not it.is_end:
    att = it.object.attribute
    ## perform here any attribute modification
    it.increment()
__init__()

Default constructor.

shade(stroke)

The shading method. Must be overloaded by inherited classes.

Parameters

stroke (Stroke) – A Stroke object.

name

The name of the stroke shader.

Type

str

class freestyle.types.StrokeVertex

Class hierarchy: Interface0D > CurvePoint > StrokeVertex

Class to define a stroke vertex.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (StrokeVertex) – A StrokeVertex object.

__init__(first_vertex, second_vertex, t3d)

Build a stroke vertex from 2 stroke vertices and an interpolation parameter.

Parameters

  • first_vertex (StrokeVertex) – The first StrokeVertex.

  • second_vertex (StrokeVertex) – The second StrokeVertex.

  • t3d (float) – An interpolation parameter.

__init__(point)

Build a stroke vertex from a CurvePoint

Parameters

point (CurvePoint) – A CurvePoint object.

__init__(svertex)

Build a stroke vertex from a SVertex

Parameters

svertex (SVertex) – An SVertex object.

__init__(svertex, attribute)

Build a stroke vertex from an SVertex and a StrokeAttribute object.

Parameters
attribute

StrokeAttribute for this StrokeVertex.

Type

StrokeAttribute

curvilinear_abscissa

Curvilinear abscissa of this StrokeVertex in the Stroke.

Type

float

point

2D point coordinates.

Type

mathutils.Vector

stroke_length

Stroke length (it is only a value retained by the StrokeVertex, and it won’t change the real stroke length).

Type

float

u

Curvilinear abscissa of this StrokeVertex in the Stroke.

Type

float

class freestyle.types.StrokeVertexIterator

Class hierarchy: Iterator > StrokeVertexIterator

Class defining an iterator designed to iterate over the StrokeVertex of a Stroke. An instance of a StrokeVertexIterator can be obtained from a Stroke by calling iter(), stroke_vertices_begin() or stroke_vertices_begin(). It is iterating over the same vertices as an Interface0DIterator. The difference resides in the object access: an Interface0DIterator only allows access to an Interface0D while one might need to access the specialized StrokeVertex type. In this case, one should use a StrokeVertexIterator. To call functions of the UnaryFuntion0D type, a StrokeVertexIterator can be converted to an Interface0DIterator by by calling Interface0DIterator(it).

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (StrokeVertexIterator) – A StrokeVertexIterator object.

decremented()

Returns a copy of a decremented StrokeVertexIterator.

Returns

A StrokeVertexIterator pointing the previous StrokeVertex.

Return type

StrokeVertexIterator

incremented()

Returns a copy of an incremented StrokeVertexIterator.

Returns

A StrokeVertexIterator pointing the next StrokeVertex.

Return type

StrokeVertexIterator

reversed()

Returns a StrokeVertexIterator that traverses stroke vertices in the reversed order.

Returns

A StrokeVertexIterator traversing stroke vertices backward.

Return type

StrokeVertexIterator

at_last

True if the iterator points to the last valid element. For its counterpart (pointing to the first valid element), use it.is_begin.

Type

bool

object

The StrokeVertex object currently pointed to by this iterator.

Type

StrokeVertex

t

The curvilinear abscissa of the current point.

Type

float

u

The point parameter at the current point in the stroke (0 <= u <= 1).

Type

float

class freestyle.types.TVertex

Class hierarchy: Interface0D > ViewVertex > TVertex

Class to define a T vertex, i.e. an intersection between two edges. It points towards two SVertex and four ViewEdges. Among the ViewEdges, two are front and the other two are back. Basically a front edge hides part of a back edge. So, among the back edges, one is of invisibility N and the other of invisibility N+1.

__init__()

Default constructor.

get_mate(viewedge)

Returns the mate edge of the ViewEdge given as argument. If the ViewEdge is frontEdgeA, frontEdgeB is returned. If the ViewEdge is frontEdgeB, frontEdgeA is returned. Same for back edges.

Parameters

viewedge (ViewEdge) – A ViewEdge object.

Returns

The mate edge of the given ViewEdge.

Return type

ViewEdge

get_svertex(fedge)

Returns the SVertex (among the 2) belonging to the given FEdge.

Parameters

fedge (FEdge) – An FEdge object.

Returns

The SVertex belonging to the given FEdge.

Return type

SVertex

back_svertex

The SVertex that is further away from the viewpoint.

Type

SVertex

front_svertex

The SVertex that is closer to the viewpoint.

Type

SVertex

id

The Id of this TVertex.

Type

Id

class freestyle.types.UnaryFunction0D

Base class for Unary Functions (functors) working on Interface0DIterator. A unary function will be used by invoking __call__() on an Interface0DIterator. In Python, several different subclasses of UnaryFunction0D are used depending on the types of functors’ return values. For example, you would inherit from a UnaryFunction0DDouble if you wish to define a function that returns a double value. Available UnaryFunction0D subclasses are:

name

The name of the unary 0D function.

Type

str

class freestyle.types.UnaryFunction0DDouble

Class hierarchy: UnaryFunction0D > UnaryFunction0DDouble

Base class for unary functions (functors) that work on Interface0DIterator and return a float value.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DEdgeNature

Class hierarchy: UnaryFunction0D > UnaryFunction0DEdgeNature

Base class for unary functions (functors) that work on Interface0DIterator and return a Nature object.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DFloat

Class hierarchy: UnaryFunction0D > UnaryFunction0DFloat

Base class for unary functions (functors) that work on Interface0DIterator and return a float value.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DId

Class hierarchy: UnaryFunction0D > UnaryFunction0DId

Base class for unary functions (functors) that work on Interface0DIterator and return an Id object.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DMaterial

Class hierarchy: UnaryFunction0D > UnaryFunction0DMaterial

Base class for unary functions (functors) that work on Interface0DIterator and return a Material object.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DUnsigned

Class hierarchy: UnaryFunction0D > UnaryFunction0DUnsigned

Base class for unary functions (functors) that work on Interface0DIterator and return an int value.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DVec2f

Class hierarchy: UnaryFunction0D > UnaryFunction0DVec2f

Base class for unary functions (functors) that work on Interface0DIterator and return a 2D vector.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DVec3f

Class hierarchy: UnaryFunction0D > UnaryFunction0DVec3f

Base class for unary functions (functors) that work on Interface0DIterator and return a 3D vector.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DVectorViewShape

Class hierarchy: UnaryFunction0D > UnaryFunction0DVectorViewShape

Base class for unary functions (functors) that work on Interface0DIterator and return a list of ViewShape objects.

__init__()

Default constructor.

class freestyle.types.UnaryFunction0DViewShape

Class hierarchy: UnaryFunction0D > UnaryFunction0DViewShape

Base class for unary functions (functors) that work on Interface0DIterator and return a ViewShape object.

__init__()

Default constructor.

class freestyle.types.UnaryFunction1D

Base class for Unary Functions (functors) working on Interface1D. A unary function will be used by invoking __call__() on an Interface1D. In Python, several different subclasses of UnaryFunction1D are used depending on the types of functors’ return values. For example, you would inherit from a UnaryFunction1DDouble if you wish to define a function that returns a double value. Available UnaryFunction1D subclasses are:

name

The name of the unary 1D function.

Type

str

class freestyle.types.UnaryFunction1DDouble

Class hierarchy: UnaryFunction1D > UnaryFunction1DDouble

Base class for unary functions (functors) that work on Interface1D and return a float value.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryFunction1DEdgeNature

Class hierarchy: UnaryFunction1D > UnaryFunction1DEdgeNature

Base class for unary functions (functors) that work on Interface1D and return a Nature object.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryFunction1DFloat

Class hierarchy: UnaryFunction1D > UnaryFunction1DFloat

Base class for unary functions (functors) that work on Interface1D and return a float value.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryFunction1DUnsigned

Class hierarchy: UnaryFunction1D > UnaryFunction1DUnsigned

Base class for unary functions (functors) that work on Interface1D and return an int value.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryFunction1DVec2f

Class hierarchy: UnaryFunction1D > UnaryFunction1DVec2f

Base class for unary functions (functors) that work on Interface1D and return a 2D vector.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryFunction1DVec3f

Class hierarchy: UnaryFunction1D > UnaryFunction1DVec3f

Base class for unary functions (functors) that work on Interface1D and return a 3D vector.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryFunction1DVectorViewShape

Class hierarchy: UnaryFunction1D > UnaryFunction1DVectorViewShape

Base class for unary functions (functors) that work on Interface1D and return a list of ViewShape objects.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryFunction1DVoid

Class hierarchy: UnaryFunction1D > UnaryFunction1DVoid

Base class for unary functions (functors) working on Interface1D.

__init__()

Default constructor.

__init__(integration_type)

Builds a unary 1D function using the integration method given as argument.

Parameters

integration_type (IntegrationType) – An integration method.

integration_type

The integration method.

Type

IntegrationType

class freestyle.types.UnaryPredicate0D

Base class for unary predicates that work on Interface0DIterator. A UnaryPredicate0D is a functor that evaluates a condition on an Interface0DIterator and returns true or false depending on whether this condition is satisfied or not. The UnaryPredicate0D is used by invoking its __call__() method. Any inherited class must overload the __call__() method.

__init__()

Default constructor.

__call__(it)

Must be overload by inherited classes.

Parameters

it (Interface0DIterator) – The Interface0DIterator pointing onto the Interface0D at which we wish to evaluate the predicate.

Returns

True if the condition is satisfied, false otherwise.

Return type

bool

name

The name of the unary 0D predicate.

Type

str

class freestyle.types.UnaryPredicate1D

Base class for unary predicates that work on Interface1D. A UnaryPredicate1D is a functor that evaluates a condition on a Interface1D and returns true or false depending on whether this condition is satisfied or not. The UnaryPredicate1D is used by invoking its __call__() method. Any inherited class must overload the __call__() method.

__init__()

Default constructor.

__call__(inter)

Must be overload by inherited classes.

Parameters

inter (Interface1D) – The Interface1D on which we wish to evaluate the predicate.

Returns

True if the condition is satisfied, false otherwise.

Return type

bool

name

The name of the unary 1D predicate.

Type

str

class freestyle.types.ViewEdge

Class hierarchy: Interface1D > ViewEdge

Class defining a ViewEdge. A ViewEdge in an edge of the image graph. it connects two ViewVertex objects. It is made by connecting a set of FEdges.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (ViewEdge) – A ViewEdge object.

update_fedges()

Sets Viewedge to this for all embedded fedges.

chaining_time_stamp

The time stamp of this ViewEdge.

Type

int

first_fedge

The first FEdge that constitutes this ViewEdge.

Type

FEdge

first_viewvertex

The first ViewVertex.

Type

ViewVertex

id

The Id of this ViewEdge.

Type

Id

is_closed

True if this ViewEdge forms a closed loop.

Type

bool

last_fedge

The last FEdge that constitutes this ViewEdge.

Type

FEdge

last_viewvertex

The second ViewVertex.

Type

ViewVertex

nature

The nature of this ViewEdge.

Type

Nature

occludee

The shape that is occluded by the ViewShape to which this ViewEdge belongs to. If no object is occluded, this property is set to None.

Type

ViewShape

qi

The quantitative invisibility.

Type

int

viewshape

The ViewShape to which this ViewEdge belongs to.

Type

ViewShape

class freestyle.types.ViewEdgeIterator

Class hierarchy: Iterator > ViewEdgeIterator

Base class for iterators over ViewEdges of the ViewMap Graph. Basically the increment() operator of this class should be able to take the decision of “where” (on which ViewEdge) to go when pointing on a given ViewEdge.

__init__(begin=None, orientation=True)

Builds a ViewEdgeIterator from a starting ViewEdge and its orientation.

Parameters

  • begin (ViewEdge or None) – The ViewEdge from where to start the iteration.

  • orientation (bool) – If true, we’ll look for the next ViewEdge among the ViewEdges that surround the ending ViewVertex of begin. If false, we’ll search over the ViewEdges surrounding the ending ViewVertex of begin.

__init__(brother)

Copy constructor.

Parameters

brother (ViewEdgeIterator) – A ViewEdgeIterator object.

change_orientation()

Changes the current orientation.

begin

The first ViewEdge used for the iteration.

Type

ViewEdge

current_edge

The ViewEdge object currently pointed by this iterator.

Type

ViewEdge

object

The ViewEdge object currently pointed by this iterator.

Type

ViewEdge

orientation

The orientation of the pointed ViewEdge in the iteration. If true, the iterator looks for the next ViewEdge among those ViewEdges that surround the ending ViewVertex of the “begin” ViewEdge. If false, the iterator searches over the ViewEdges surrounding the ending ViewVertex of the “begin” ViewEdge.

Type

bool

class freestyle.types.ViewMap

Class defining the ViewMap.

__init__()

Default constructor.

get_closest_fedge(x, y)

Gets the FEdge nearest to the 2D point specified as arguments.

Parameters

  • x (float) – X coordinate of a 2D point.

  • y (float) – Y coordinate of a 2D point.

Returns

The FEdge nearest to the specified 2D point.

Return type

FEdge

get_closest_viewedge(x, y)

Gets the ViewEdge nearest to the 2D point specified as arguments.

Parameters

  • x (float) – X coordinate of a 2D point.

  • y (float) – Y coordinate of a 2D point.

Returns

The ViewEdge nearest to the specified 2D point.

Return type

ViewEdge

scene_bbox

The 3D bounding box of the scene.

Type

BBox

class freestyle.types.ViewShape

Class gathering the elements of the ViewMap (i.e., ViewVertex and ViewEdge) that are issued from the same input shape.

__init__()

Default constructor.

__init__(brother)

Copy constructor.

Parameters

brother (ViewShape) – A ViewShape object.

__init__(sshape)

Builds a ViewShape from an SShape.

Parameters

sshape (SShape) – An SShape object.

add_edge(edge)

Adds a ViewEdge to the list of ViewEdge objects.

Parameters

edge (ViewEdge) – A ViewEdge object.

add_vertex(vertex)

Adds a ViewVertex to the list of the ViewVertex objects.

Parameters

vertex (ViewVertex) – A ViewVertex object.

edges

The list of ViewEdge objects contained in this ViewShape.

Type

List of ViewEdge objects

id

The Id of this ViewShape.

Type

Id

library_path

The library path of the ViewShape.

Type

str, or None if the ViewShape is not part of a library

name

The name of the ViewShape.

Type

str

sshape

The SShape on top of which this ViewShape is built.

Type

SShape

vertices

The list of ViewVertex objects contained in this ViewShape.

Type

List of ViewVertex objects

class freestyle.types.ViewVertex

Class hierarchy: Interface0D > ViewVertex

Class to define a view vertex. A view vertex is a feature vertex corresponding to a point of the image graph, where the characteristics of an edge (e.g., nature and visibility) might change. A ViewVertex can be of two kinds: A TVertex when it corresponds to the intersection between two ViewEdges or a NonTVertex when it corresponds to a vertex of the initial input mesh (it is the case for vertices such as corners for example). Thus, this class can be specialized into two classes, the TVertex class and the NonTVertex class.

edges_begin()

Returns an iterator over the ViewEdges that goes to or comes from this ViewVertex pointing to the first ViewEdge of the list. The orientedViewEdgeIterator allows to iterate in CCW order over these ViewEdges and to get the orientation for each ViewEdge (incoming/outgoing).

Returns

An orientedViewEdgeIterator pointing to the first ViewEdge.

Return type

orientedViewEdgeIterator

edges_end()

Returns an orientedViewEdgeIterator over the ViewEdges around this ViewVertex, pointing after the last ViewEdge.

Returns

An orientedViewEdgeIterator pointing after the last ViewEdge.

Return type

orientedViewEdgeIterator

edges_iterator(edge)

Returns an orientedViewEdgeIterator pointing to the ViewEdge given as argument.

Parameters

edge (ViewEdge) – A ViewEdge object.

Returns

An orientedViewEdgeIterator pointing to the given ViewEdge.

Return type

orientedViewEdgeIterator

nature

The nature of this ViewVertex.

Type

Nature

class freestyle.types.orientedViewEdgeIterator

Class hierarchy: Iterator > orientedViewEdgeIterator

Class representing an iterator over oriented ViewEdges around a ViewVertex. This iterator allows a CCW iteration (in the image plane). An instance of an orientedViewEdgeIterator can only be obtained from a ViewVertex by calling edges_begin() or edges_end().

__init__()

Default constructor.

__init__(iBrother)

Copy constructor.

Parameters

iBrother (orientedViewEdgeIterator) – An orientedViewEdgeIterator object.

object

The oriented ViewEdge (i.e., a tuple of the pointed ViewEdge and a boolean value) currently pointed to by this iterator. If the boolean value is true, the ViewEdge is incoming.

Type

(ViewEdge, bool)