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/* Copyright (c) 2007 Scott Lembcke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
// For determinism, you can reset the shape id counter.
void cpResetShapeIdCounter(void);
// Enumeration of shape types.
typedef enum cpShapeType{
CP_CIRCLE_SHAPE,
CP_SEGMENT_SHAPE,
CP_POLY_SHAPE,
CP_NUM_SHAPES
} cpShapeType;
// Basic shape struct that the others inherit from.
typedef struct cpShape{
cpShapeType type;
// Called by cpShapeCacheBB().
cpBB (*cacheData)(struct cpShape *shape, cpVect p, cpVect rot);
// Called to by cpShapeDestroy().
void (*destroy)(struct cpShape *shape);
// Unique id used as the hash value.
unsigned int id;
// Cached BBox for the shape.
cpBB bb;
// User defined collision type for the shape.
unsigned int collision_type;
// User defined collision group for the shape.
unsigned int group;
// User defined layer bitmask for the shape.
unsigned int layers;
// User defined data pointer for the shape.
void *data;
// cpBody that the shape is attached to.
cpBody *body;
// Coefficient of restitution. (elasticity)
cpFloat e;
// Coefficient of friction.
cpFloat u;
// Surface velocity used when solving for friction.
cpVect surface_v;
} cpShape;
// Low level shape initialization func.
cpShape* cpShapeInit(cpShape *shape, cpShapeType type, cpBody *body);
// Basic destructor functions. (allocation functions are not shared)
void cpShapeDestroy(cpShape *shape);
void cpShapeFree(cpShape *shape);
// Cache the BBox of the shape.
cpBB cpShapeCacheBB(cpShape *shape);
// Circle shape structure.
typedef struct cpCircleShape{
cpShape shape;
// Center. (body space coordinates)
cpVect c;
// Radius.
cpFloat r;
// Transformed center. (world space coordinates)
cpVect tc;
} cpCircleShape;
// Basic allocation functions for cpCircleShape.
cpCircleShape *cpCircleShapeAlloc(void);
cpCircleShape *cpCircleShapeInit(cpCircleShape *circle, cpBody *body, cpFloat radius, cpVect offset);
cpShape *cpCircleShapeNew(cpBody *body, cpFloat radius, cpVect offset);
// Segment shape structure.
typedef struct cpSegmentShape{
cpShape shape;
// Endpoints and normal of the segment. (body space coordinates)
cpVect a, b, n;
// Radius of the segment. (Thickness)
cpFloat r;
// Transformed endpoints and normal. (world space coordinates)
cpVect ta, tb, tn;
} cpSegmentShape;
// Basic allocation functions for cpSegmentShape.
cpSegmentShape* cpSegmentShapeAlloc(void);
cpSegmentShape* cpSegmentShapeInit(cpSegmentShape *seg, cpBody *body, cpVect a, cpVect b, cpFloat r);
cpShape* cpSegmentShapeNew(cpBody *body, cpVect a, cpVect b, cpFloat r);
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