mirror of https://github.com/axmolengine/axmol.git
137 lines
5.1 KiB
C
137 lines
5.1 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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static cpBody *tankBody, *tankControlBody;
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static void
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update(cpSpace *space, double dt)
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{
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// turn the control body based on the angle relative to the actual body
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cpVect mouseDelta = cpvsub(ChipmunkDemoMouse, cpBodyGetPosition(tankBody));
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cpFloat turn = cpvtoangle(cpvunrotate(cpBodyGetRotation(tankBody), mouseDelta));
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cpBodySetAngle(tankControlBody, cpBodyGetAngle(tankBody) - turn);
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// drive the tank towards the mouse
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if(cpvnear(ChipmunkDemoMouse, cpBodyGetPosition(tankBody), 30.0)){
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cpBodySetVelocity(tankControlBody, cpvzero); // stop
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} else {
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cpFloat direction = (cpvdot(mouseDelta, cpBodyGetRotation(tankBody)) > 0.0 ? 1.0 : -1.0);
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cpBodySetVelocity(tankControlBody, cpvrotate(cpBodyGetRotation(tankBody), cpv(30.0f*direction, 0.0f)));
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}
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cpSpaceStep(space, dt);
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}
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static cpBody *
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add_box(cpSpace *space, cpFloat size, cpFloat mass)
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{
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cpFloat radius = cpvlength(cpv(size, size));
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cpBody *body = cpSpaceAddBody(space, cpBodyNew(mass, cpMomentForBox(mass, size, size)));
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cpBodySetPosition(body, cpv(frand()*(640 - 2*radius) - (320 - radius), frand()*(480 - 2*radius) - (240 - radius)));
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cpShape *shape = cpSpaceAddShape(space, cpBoxShapeNew(body, size, size, 0.0));
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cpShapeSetElasticity(shape, 0.0f);
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cpShapeSetFriction(shape, 0.7f);
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return body;
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}
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static cpSpace *
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init(void)
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{
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ChipmunkDemoMessageString = "Use the mouse to drive the tank, it will follow the cursor.";
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cpSpace *space = cpSpaceNew();
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cpSpaceSetIterations(space, 10);
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cpSpaceSetSleepTimeThreshold(space, 0.5f);
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cpBody *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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for(int i=0; i<50; i++){
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cpBody *body = add_box(space, 20, 1);
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cpConstraint *pivot = cpSpaceAddConstraint(space, cpPivotJointNew2(staticBody, body, cpvzero, cpvzero));
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cpConstraintSetMaxBias(pivot, 0); // disable joint correction
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cpConstraintSetMaxForce(pivot, 1000.0f); // emulate linear friction
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cpConstraint *gear = cpSpaceAddConstraint(space, cpGearJointNew(staticBody, body, 0.0f, 1.0f));
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cpConstraintSetMaxBias(gear, 0); // disable joint correction
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cpConstraintSetMaxForce(gear, 5000.0f); // emulate angular friction
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}
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// We joint the tank to the control body and control the tank indirectly by modifying the control body.
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tankControlBody = cpSpaceAddBody(space, cpBodyNewKinematic());
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tankBody = add_box(space, 30, 10);
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cpConstraint *pivot = cpSpaceAddConstraint(space, cpPivotJointNew2(tankControlBody, tankBody, cpvzero, cpvzero));
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cpConstraintSetMaxBias(pivot, 0); // disable joint correction
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cpConstraintSetMaxForce(pivot, 10000.0f); // emulate linear friction
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cpConstraint *gear = cpSpaceAddConstraint(space, cpGearJointNew(tankControlBody, tankBody, 0.0f, 1.0f));
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cpConstraintSetErrorBias(gear, 0); // attempt to fully correct the joint each step
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cpConstraintSetMaxBias(gear, 1.2f); // but limit it's angular correction rate
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cpConstraintSetMaxForce(gear, 50000.0f); // emulate angular friction
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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 Tank = {
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"Tank",
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1.0/60.0,
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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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