mirror of https://github.com/axmolengine/axmol.git
111 lines
4.0 KiB
C
111 lines
4.0 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 "chipmunk/chipmunk.h"
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#include "chipmunk/chipmunk_unsafe.h"
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#include "ChipmunkDemo.h"
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#define DENSITY (1.0 / 10000.0)
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static cpShape* shape;
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static void update(cpSpace* space, double dt)
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{
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cpFloat tolerance = 2.0;
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if (ChipmunkDemoRightClick && cpShapePointQuery(shape, ChipmunkDemoMouse, NULL) > tolerance)
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{
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cpBody* body = cpShapeGetBody(shape);
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int count = cpPolyShapeGetCount(shape);
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// Allocate the space for the new vertexes on the stack.
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cpVect* verts = (cpVect*)alloca((count + 1) * sizeof(cpVect));
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for (int i = 0; i < count; i++)
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{
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verts[i] = cpPolyShapeGetVert(shape, i);
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}
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verts[count] = cpBodyWorldToLocal(body, ChipmunkDemoMouse);
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// This function builds a convex hull for the vertexes.
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// Because the result array is the same as verts, it will reduce it in place.
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int hullCount = cpConvexHull(count + 1, verts, verts, NULL, tolerance);
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// Figure out how much to shift the body by.
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cpVect centroid = cpCentroidForPoly(hullCount, verts);
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// Recalculate the body properties to match the updated shape.
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cpFloat mass = cpAreaForPoly(hullCount, verts, 0.0f) * DENSITY;
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cpBodySetMass(body, mass);
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cpBodySetMoment(body, cpMomentForPoly(mass, hullCount, verts, cpvneg(centroid), 0.0f));
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cpBodySetPosition(body, cpBodyLocalToWorld(body, centroid));
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// Use the setter function from chipmunk_unsafe.h.
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// You could also remove and recreate the shape if you wanted.
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cpPolyShapeSetVerts(shape, hullCount, verts, cpTransformTranslate(cpvneg(centroid)));
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}
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cpSpaceStep(space, dt);
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}
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static cpSpace* init(void)
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{
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ChipmunkDemoMessageString = "Right click and drag to change the blocks's shape.";
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cpSpace* space = cpSpaceNew();
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cpSpaceSetIterations(space, 30);
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cpSpaceSetGravity(space, cpv(0, -500));
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cpSpaceSetSleepTimeThreshold(space, 0.5f);
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cpSpaceSetCollisionSlop(space, 0.5f);
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cpBody *body, *staticBody = cpSpaceGetStaticBody(space);
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// Create segments around the edge of the screen.
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shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-320, -240), cpv(320, -240), 0.0f));
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cpShapeSetElasticity(shape, 1.0f);
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cpShapeSetFriction(shape, 1.0f);
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cpShapeSetFilter(shape, NOT_GRABBABLE_FILTER);
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cpFloat width = 50.0f;
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cpFloat height = 70.0f;
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cpFloat mass = width * height * DENSITY;
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cpFloat moment = cpMomentForBox(mass, width, height);
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body = cpSpaceAddBody(space, cpBodyNew(mass, moment));
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shape = cpSpaceAddShape(space, cpBoxShapeNew(body, width, height, 0.0));
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cpShapeSetFriction(shape, 0.6f);
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return space;
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}
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static void destroy(cpSpace* space)
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{
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ChipmunkDemoFreeSpaceChildren(space);
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cpSpaceFree(space);
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}
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ChipmunkDemo Convex = {
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"Convex.", 1.0 / 60.0, init, update, ChipmunkDemoDefaultDrawImpl, destroy,
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};
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