C# Class Project290.Physics.Collision.Shapes.PolygonShape

Represents a simple non-selfintersecting convex polygon. If you want to have concave polygons, you will have to use the BayazitDecomposer or the EarclipDecomposer to decompose the concave polygon into 2 or more convex polygons.

Inheritance: Shape

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Public Properties

Property	Type	Description
Normals	Vertices
Vertices	Vertices

Public Methods

Method	Description
Clone ( ) : Shape
ComputeAABB ( AABB &aabb, Transform &transform, int childIndex ) : void	Given a transform, compute the associated axis aligned bounding box for a child shape.
ComputeProperties ( ) : void	Compute the mass properties of this shape using its dimensions and density. The inertia tensor is computed about the local origin, not the centroid.
PolygonShape ( Vertices vertices, float density ) : System.Diagnostics	Initializes a new instance of the PolygonShape class.
PolygonShape ( float density ) : System.Diagnostics
RayCast ( RayCastOutput &output, RayCastInput &input, Transform &transform, int childIndex ) : bool	Cast a ray against a child shape.
Set ( Vertices vertices ) : void	Copy vertices. This assumes the vertices define a convex polygon. It is assumed that the exterior is the the right of each edge.
SetAsBox ( float halfWidth, float halfHeight ) : void	Build vertices to represent an axis-aligned box.
SetAsBox ( float halfWidth, float halfHeight, Vector2 center, float angle ) : void	Build vertices to represent an oriented box.
SetAsEdge ( Vector2 start, Vector2 end ) : void	Set this as a single edge.
TestPoint ( Transform &transform, Vector2 &point ) : bool	Test a point for containment in this shape. This only works for convex shapes.

Private Methods

Method	Description
PolygonShape ( ) : System.Diagnostics

Method Details

Clone() public method

public Clone ( ) : Shape
return	Shape

ComputeAABB() public method

Given a transform, compute the associated axis aligned bounding box for a child shape.

public ComputeAABB ( AABB &aabb, Transform &transform, int childIndex ) : void
aabb	AABB	The aabb results.
transform	Transform	The world transform of the shape.
childIndex	int	The child shape index.
return	void

ComputeProperties() public method

Compute the mass properties of this shape using its dimensions and density. The inertia tensor is computed about the local origin, not the centroid.

public ComputeProperties ( ) : void
return	void

PolygonShape() public method

Initializes a new instance of the PolygonShape class.

public PolygonShape ( Vertices vertices, float density ) : System.Diagnostics
vertices	Vertices	The vertices.
density	float	The density.
return	System.Diagnostics

PolygonShape() public method

public PolygonShape ( float density ) : System.Diagnostics
density	float
return	System.Diagnostics

RayCast() public method

Cast a ray against a child shape.

public RayCast ( RayCastOutput &output, RayCastInput &input, Transform &transform, int childIndex ) : bool
output	RayCastOutput	The ray-cast results.
input	RayCastInput	The ray-cast input parameters.
transform	Transform	The transform to be applied to the shape.
childIndex	int	The child shape index.
return	bool

Set() public method

Copy vertices. This assumes the vertices define a convex polygon. It is assumed that the exterior is the the right of each edge.

public Set ( Vertices vertices ) : void
vertices	Vertices	The vertices.
return	void

SetAsBox() public method

Build vertices to represent an axis-aligned box.

public SetAsBox ( float halfWidth, float halfHeight ) : void
halfWidth	float	The half-width.
halfHeight	float	The half-height.
return	void

SetAsBox() public method

Build vertices to represent an oriented box.

public SetAsBox ( float halfWidth, float halfHeight, Vector2 center, float angle ) : void
halfWidth	float	The half-width..
halfHeight	float	The half-height.
center	Microsoft.Xna.Framework.Vector2	The center of the box in local coordinates.
angle	float	The rotation of the box in local coordinates.
return	void

SetAsEdge() public method

Set this as a single edge.

public SetAsEdge ( Vector2 start, Vector2 end ) : void
start	Microsoft.Xna.Framework.Vector2	The start.
end	Microsoft.Xna.Framework.Vector2	The end.
return	void

TestPoint() public method

Test a point for containment in this shape. This only works for convex shapes.

public TestPoint ( Transform &transform, Vector2 &point ) : bool
transform	Transform	The shape world transform.
point	Microsoft.Xna.Framework.Vector2	a point in world coordinates.
return	bool

Property Details

Normals public_oe property

public Vertices Normals
return	Vertices

Vertices public_oe property

public Vertices Vertices
return	Vertices