90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
/*
|
|
* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
|
|
*
|
|
* This software is provided 'as-is', without any express or implied
|
|
* warranty. In no event will the authors be held liable for any damages
|
|
* arising from the use of this software.
|
|
* Permission is granted to anyone to use this software for any purpose,
|
|
* including commercial applications, and to alter it and redistribute it
|
|
* freely, subject to the following restrictions:
|
|
* 1. The origin of this software must not be misrepresented; you must not
|
|
* claim that you wrote the original software. If you use this software
|
|
* in a product, an acknowledgment in the product documentation would be
|
|
* appreciated but is not required.
|
|
* 2. Altered source versions must be plainly marked as such, and must not be
|
|
* misrepresented as being the original software.
|
|
* 3. This notice may not be removed or altered from any source distribution.
|
|
*/
|
|
|
|
#ifndef B2_POLYGON_SHAPE_H
|
|
#define B2_POLYGON_SHAPE_H
|
|
|
|
#include "Box2D/Collision/Shapes/b2Shape.h"
|
|
|
|
/// A convex polygon. It is assumed that the interior of the polygon is to
|
|
/// the left of each edge.
|
|
/// Polygons have a maximum number of vertices equal to b2_maxPolygonVertices.
|
|
/// In most cases you should not need many vertices for a convex polygon.
|
|
class b2PolygonShape : public b2Shape
|
|
{
|
|
public:
|
|
b2PolygonShape();
|
|
|
|
/// Implement b2Shape.
|
|
b2Shape* Clone(b2BlockAllocator* allocator) const override;
|
|
|
|
/// @see b2Shape::GetChildCount
|
|
int32 GetChildCount() const override;
|
|
|
|
/// Create a convex hull from the given array of local points.
|
|
/// The count must be in the range [3, b2_maxPolygonVertices].
|
|
/// @warning the points may be re-ordered, even if they form a convex polygon
|
|
/// @warning collinear points are handled but not removed. Collinear points
|
|
/// may lead to poor stacking behavior.
|
|
void Set(const b2Vec2* points, int32 count);
|
|
|
|
/// Build vertices to represent an axis-aligned box centered on the local origin.
|
|
/// @param hx the half-width.
|
|
/// @param hy the half-height.
|
|
void SetAsBox(float32 hx, float32 hy);
|
|
|
|
/// Build vertices to represent an oriented box.
|
|
/// @param hx the half-width.
|
|
/// @param hy the half-height.
|
|
/// @param center the center of the box in local coordinates.
|
|
/// @param angle the rotation of the box in local coordinates.
|
|
void SetAsBox(float32 hx, float32 hy, const b2Vec2& center, float32 angle);
|
|
|
|
/// @see b2Shape::TestPoint
|
|
bool TestPoint(const b2Transform& transform, const b2Vec2& p) const override;
|
|
|
|
/// Implement b2Shape.
|
|
bool RayCast(b2RayCastOutput* output, const b2RayCastInput& input,
|
|
const b2Transform& transform, int32 childIndex) const override;
|
|
|
|
/// @see b2Shape::ComputeAABB
|
|
void ComputeAABB(b2AABB* aabb, const b2Transform& transform, int32 childIndex) const override;
|
|
|
|
/// @see b2Shape::ComputeMass
|
|
void ComputeMass(b2MassData* massData, float32 density) const override;
|
|
|
|
/// Validate convexity. This is a very time consuming operation.
|
|
/// @returns true if valid
|
|
bool Validate() const;
|
|
|
|
b2Vec2 m_centroid;
|
|
b2Vec2 m_vertices[b2_maxPolygonVertices];
|
|
b2Vec2 m_normals[b2_maxPolygonVertices];
|
|
int32 m_count;
|
|
};
|
|
|
|
inline b2PolygonShape::b2PolygonShape()
|
|
{
|
|
m_type = e_polygon;
|
|
m_radius = b2_polygonRadius;
|
|
m_count = 0;
|
|
m_centroid.SetZero();
|
|
}
|
|
|
|
#endif
|