mirror of https://github.com/axmolengine/axmol.git
106 lines
2.9 KiB
C
106 lines
2.9 KiB
C
/* Copyright (c) 2007 Scott Lembcke
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "chipmunk.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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void cpInitCollisionFuncs(void);
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#ifdef __cplusplus
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}
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#endif
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void
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cpMessage(const char *message, const char *condition, const char *file, int line, int isError)
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{
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fprintf(stderr, (isError ? "Aborting due to Chipmunk error: %s\n" : "Chipmunk warning: %s\n"), message);
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fprintf(stderr, "\tFailed condition: %s\n", condition);
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fprintf(stderr, "\tSource:%s:%d\n", file, line);
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if(isError) abort();
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}
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char *cpVersionString = "5.x.x";
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void
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cpInitChipmunk(void)
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{
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#ifndef NDEBUG
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printf("Initializing Chipmunk v%s (Debug Enabled)\n", cpVersionString);
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printf("Compile with -DNDEBUG defined to disable debug mode and runtime assertion checks\n");
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#endif
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cpInitCollisionFuncs();
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}
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cpFloat
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cpMomentForCircle(cpFloat m, cpFloat r1, cpFloat r2, cpVect offset)
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{
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return (1.0f/2.0f)*m*(r1*r1 + r2*r2) + m*cpvdot(offset, offset);
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}
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cpFloat
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cpMomentForSegment(cpFloat m, cpVect a, cpVect b)
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{
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cpFloat length = cpvlength(cpvsub(b, a));
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cpVect offset = cpvmult(cpvadd(a, b), 1.0f/2.0f);
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return m*length*length/12.0f + m*cpvdot(offset, offset);
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}
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cpFloat
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cpMomentForPoly(cpFloat m, const int numVerts, cpVect *verts, cpVect offset)
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{
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cpVect *tVerts = (cpVect *)cpcalloc(numVerts, sizeof(cpVect));
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for(int i=0; i<numVerts; i++)
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tVerts[i] = cpvadd(verts[i], offset);
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cpFloat sum1 = 0.0f;
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cpFloat sum2 = 0.0f;
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for(int i=0; i<numVerts; i++){
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cpVect v1 = tVerts[i];
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cpVect v2 = tVerts[(i+1)%numVerts];
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cpFloat a = cpvcross(v2, v1);
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cpFloat b = cpvdot(v1, v1) + cpvdot(v1, v2) + cpvdot(v2, v2);
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sum1 += a*b;
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sum2 += a;
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}
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cpfree(tVerts);
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return (m*sum1)/(6.0f*sum2);
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}
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cpFloat
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cpMomentForBox(cpFloat m, cpFloat width, cpFloat height)
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{
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return m*(width*width + height*height)/12;
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}
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#include "chipmunk_ffi.h"
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