mirror of https://github.com/axmolengine/axmol.git
151 lines
4.8 KiB
C
151 lines
4.8 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 "ChipmunkDemo.h"
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#define CHAIN_COUNT 8
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#define LINK_COUNT 10
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static void
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BreakablejointPostStepRemove(cpSpace *space, cpConstraint *joint, void *unused)
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{
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cpSpaceRemoveConstraint(space, joint);
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cpConstraintFree(joint);
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}
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static void
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BreakableJointPostSolve(cpConstraint *joint, cpSpace *space)
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{
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cpFloat dt = cpSpaceGetCurrentTimeStep(space);
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// Convert the impulse to a force by dividing it by the timestep.
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cpFloat force = cpConstraintGetImpulse(joint)/dt;
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cpFloat maxForce = cpConstraintGetMaxForce(joint);
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// If the force is almost as big as the joint's max force, break it.
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if(force > 0.9*maxForce){
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cpSpaceAddPostStepCallback(space, (cpPostStepFunc)BreakablejointPostStepRemove, joint, NULL);
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}
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}
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static void
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update(cpSpace *space, double dt)
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{
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cpSpaceStep(space, dt);
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}
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static cpSpace *
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init(void)
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{
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cpSpace *space = cpSpaceNew();
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cpSpaceSetIterations(space, 30);
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cpSpaceSetGravity(space, cpv(0, -100));
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cpSpaceSetSleepTimeThreshold(space, 0.5f);
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cpBody *body, *staticBody = cpSpaceGetStaticBody(space);
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cpShape *shape;
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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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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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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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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 mass = 1;
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cpFloat width = 20;
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cpFloat height = 30;
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cpFloat spacing = width*0.3;
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// Add lots of boxes.
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for(int i=0; i<CHAIN_COUNT; i++){
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cpBody *prev = NULL;
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for(int j=0; j<LINK_COUNT; j++){
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cpVect pos = cpv(40*(i - (CHAIN_COUNT - 1)/2.0), 240 - (j + 0.5)*height - (j + 1)*spacing);
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body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForBox(mass, width, height)));
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cpBodySetPosition(body, pos);
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shape = cpSpaceAddShape(space, cpSegmentShapeNew(body, cpv(0, (height - width)/2.0), cpv(0, (width - height)/2.0), width/2.0));
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cpShapeSetFriction(shape, 0.8f);
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cpFloat breakingForce = 80000;
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cpConstraint *constraint = NULL;
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if(prev == NULL){
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constraint = cpSpaceAddConstraint(space, cpSlideJointNew(body, staticBody, cpv(0, height/2), cpv(pos.x, 240), 0, spacing));
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} else {
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constraint = cpSpaceAddConstraint(space, cpSlideJointNew(body, prev, cpv(0, height/2), cpv(0, -height/2), 0, spacing));
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}
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cpConstraintSetMaxForce(constraint, breakingForce);
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cpConstraintSetPostSolveFunc(constraint, BreakableJointPostSolve);
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cpConstraintSetCollideBodies(constraint, cpFalse);
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prev = body;
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}
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}
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cpFloat radius = 15.0f;
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body = cpSpaceAddBody(space, cpBodyNew(10.0f, cpMomentForCircle(10.0f, 0.0f, radius, cpvzero)));
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cpBodySetPosition(body, cpv(0, -240 + radius+5));
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cpBodySetVelocity(body, cpv(0, 300));
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shape = cpSpaceAddShape(space, cpCircleShapeNew(body, radius, cpvzero));
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cpShapeSetElasticity(shape, 0.0f);
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cpShapeSetFriction(shape, 0.9f);
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return space;
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}
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static void
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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 Chains = {
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"Breakable Chains",
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1.0/180.0,
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init,
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update,
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ChipmunkDemoDefaultDrawImpl,
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destroy,
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};
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