/usr/include/chipmunk/cpPolyShape.h is in chipmunk-dev 5.3.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | /* 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.
*/
// Axis structure used by cpPolyShape.
typedef struct cpPolyShapeAxis{
// normal
cpVect n;
// distance from origin
cpFloat d;
} cpPolyShapeAxis;
// Convex polygon shape structure.
typedef struct cpPolyShape{
CP_PRIVATE(cpShape shape);
// Vertex and axis lists.
CP_PRIVATE(int numVerts);
CP_PRIVATE(cpVect *verts);
CP_PRIVATE(cpPolyShapeAxis *axes);
// Transformed vertex and axis lists.
CP_PRIVATE(cpVect *tVerts);
CP_PRIVATE(cpPolyShapeAxis *tAxes);
} cpPolyShape;
// Basic allocation functions.
cpPolyShape *cpPolyShapeAlloc(void);
cpPolyShape *cpPolyShapeInit(cpPolyShape *poly, cpBody *body, int numVerts, cpVect *verts, cpVect offset);
cpShape *cpPolyShapeNew(cpBody *body, int numVerts, cpVect *verts, cpVect offset);
cpPolyShape *cpBoxShapeInit(cpPolyShape *poly, cpBody *body, cpFloat width, cpFloat height);
cpShape *cpBoxShapeNew(cpBody *body, cpFloat width, cpFloat height);
// Check that a set of vertexes has a correct winding and that they are convex
cpBool cpPolyValidate(const cpVect *verts, const int numVerts);
int cpPolyShapeGetNumVerts(cpShape *shape);
cpVect cpPolyShapeGetVert(cpShape *shape, int idx);
// *** inlined utility functions
// Returns the minimum distance of the polygon to the axis.
static inline cpFloat
cpPolyShapeValueOnAxis(const cpPolyShape *poly, const cpVect n, const cpFloat d)
{
cpVect *verts = poly->CP_PRIVATE(tVerts);
cpFloat min = cpvdot(n, verts[0]);
int i;
for(i=1; i<poly->CP_PRIVATE(numVerts); i++)
min = cpfmin(min, cpvdot(n, verts[i]));
return min - d;
}
// Returns true if the polygon contains the vertex.
static inline cpBool
cpPolyShapeContainsVert(const cpPolyShape *poly, const cpVect v)
{
cpPolyShapeAxis *axes = poly->CP_PRIVATE(tAxes);
int i;
for(i=0; i<poly->CP_PRIVATE(numVerts); i++){
cpFloat dist = cpvdot(axes[i].n, v) - axes[i].d;
if(dist > 0.0f) return cpFalse;
}
return cpTrue;
}
// Same as cpPolyShapeContainsVert() but ignores faces pointing away from the normal.
static inline cpBool
cpPolyShapeContainsVertPartial(const cpPolyShape *poly, const cpVect v, const cpVect n)
{
cpPolyShapeAxis *axes = poly->CP_PRIVATE(tAxes);
int i;
for(i=0; i<poly->CP_PRIVATE(numVerts); i++){
if(cpvdot(axes[i].n, n) < 0.0f) continue;
cpFloat dist = cpvdot(axes[i].n, v) - axes[i].d;
if(dist > 0.0f) return cpFalse;
}
return cpTrue;
}
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