mirror of https://github.com/axmolengine/axmol.git
119 lines
4.1 KiB
C++
119 lines
4.1 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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enum CollisionTypes
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{
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COLLISION_TYPE_ONE_WAY = 1,
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};
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typedef struct OneWayPlatform
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{
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cpVect n; // direction objects may pass through
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} OneWayPlatform;
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static OneWayPlatform platformInstance;
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static cpBool PreSolve(cpArbiter* arb, cpSpace* space, void* ignore)
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{
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CP_ARBITER_GET_SHAPES(arb, a, b);
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OneWayPlatform* platform = (OneWayPlatform*)cpShapeGetUserData(a);
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if (cpvdot(cpArbiterGetNormal(arb), platform->n) < 0)
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{
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return cpArbiterIgnore(arb);
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}
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return cpTrue;
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}
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static void 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* init(void)
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{
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ChipmunkDemoMessageString = "One way platforms are trivial in Chipmunk using a very simple collision callback.";
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cpSpace* space = cpSpaceNew();
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cpSpaceSetIterations(space, 10);
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cpSpaceSetGravity(space, cpv(0, -100));
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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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// Add our one way segment
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shape = cpSpaceAddShape(space, cpSegmentShapeNew(staticBody, cpv(-160, -100), cpv(160, -100), 10.0f));
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cpShapeSetElasticity(shape, 1.0f);
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cpShapeSetFriction(shape, 1.0f);
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cpShapeSetCollisionType(shape, COLLISION_TYPE_ONE_WAY);
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cpShapeSetFilter(shape, NOT_GRABBABLE_FILTER);
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// We'll use the data pointer for the OneWayPlatform struct
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platformInstance.n = cpv(0, 1); // let objects pass upwards
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cpShapeSetUserData(shape, &platformInstance);
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// Add a ball to test it out
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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, -200));
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cpBodySetVelocity(body, cpv(0, 170));
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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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cpShapeSetCollisionType(shape, 2);
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cpCollisionHandler* handler = cpSpaceAddWildcardHandler(space, COLLISION_TYPE_ONE_WAY);
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handler->preSolveFunc = PreSolve;
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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 OneWay = {
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"One Way Platforms", 1.0 / 60.0, init, update, ChipmunkDemoDefaultDrawImpl, destroy,
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};
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