Vertices

Declaration

public class tainicom.Aether.Physics2D.Common.Vertices

Inherits: System.Collections.Generic.List

Constructors

Vertices

void Vertices()

Vertices

void Vertices(int capacity)

Parameters:

Vertices

void Vertices(IEnumerable<Vector2> vertices)

Parameters:

Properties

Holes

You can add holes to this collection. It will get respected by some of the triangulation algoithms, but otherwise not used.

List<Vertices> Holes { get set }

Methods

NextIndex

Gets the next index. Used for iterating all the edges with wrap-around.

int NextIndex(int index)

Parameters:

NextVertex

Gets the next vertex. Used for iterating all the edges with wrap-around.

Vector2 NextVertex(int index)

Parameters:

PreviousIndex

Gets the previous index. Used for iterating all the edges with wrap-around.

int PreviousIndex(int index)

Parameters:

PreviousVertex

Gets the previous vertex. Used for iterating all the edges with wrap-around.

Vector2 PreviousVertex(int index)

Parameters:

GetSignedArea

Gets the signed area. If the area is less than 0, it indicates that the polygon is clockwise winded.

float GetSignedArea()

Returns: The signed area

GetArea

Gets the area.

float GetArea()

GetCentroid

Gets the centroid.

Vector2 GetCentroid()

GetAABB

Returns an AABB that fully contains this polygon.

AABB GetAABB()

Translate

Translates the vertices with the specified vector.

void Translate(Vector2 value)

Parameters:

Translate

Translates the vertices with the specified vector.

void Translate(ref Vector2 value)

Parameters:

Scale

Scales the vertices with the specified vector.

void Scale(Vector2 value)

Parameters:

Scale

Scales the vertices with the specified vector.

void Scale(ref Vector2 value)

Parameters:

Rotate

Rotate the vertices with the defined value in radians. Warning: Using this method on an active set of vertices of a Body, will cause problems with collisions. Use Body.Rotation instead.

void Rotate(float value)

Parameters:

IsConvex

Determines whether the polygon is convex. O(n^2) running time. Assumptions: - The polygon is in counter clockwise order - The polygon has no overlapping edges

bool IsConvex()

Returns: true if it is convex; otherwise, false.

IsCounterClockWise

Indicates if the vertices are in counter clockwise order. Warning: If the area of the polygon is 0, it is unable to determine the winding.

bool IsCounterClockWise()

ForceCounterClockWise

Forces the vertices to be counter clock wise order.

void ForceCounterClockWise()

IsSimple

Checks if the vertices forms an simple polygon by checking for edge crossings.

bool IsSimple()

CheckPolygon

Checks if the polygon is valid for use in the engine. Performs a full check, for simplicity, convexity, orientation, minimum angle, and volume. From Eric Jordan's convex decomposition library

PolygonError CheckPolygon()

Returns: PolygonError.NoError if there were no error.

ProjectToAxis

Projects to axis.

void ProjectToAxis(ref Vector2 axis, out float min, out float max)

Parameters:

PointInPolygon

Winding number test for a point in a polygon.

int PointInPolygon(ref Vector2 point)

Parameters:

Returns: -1 if the winding number is zero and the point is outside the polygon, 1 if the point is inside the polygon, and 0 if the point is on the polygons edge.

PointInPolygonAngle

Compute the sum of the angles made between the test point and each pair of points making up the polygon. If this sum is 2pi then the point is an interior point, if 0 then the point is an exterior point. ref: http://ozviz.wasp.uwa.edu.au/~pbourke/geometry/insidepoly/ - Solution 2

bool PointInPolygonAngle(ref Vector2 point)

Parameters:

Transform

Transforms the polygon using the defined matrix.

void Transform(ref Matrix4 transform)

Parameters:

ToString override

string ToString()