?? demo5.m
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/* Copyright (c) 2007 Scott Lembcke * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ #include <stdlib.h>#include <stdio.h>#include <math.h>#include "chipmunk.h"#define SLEEP_TICKS 16extern cpSpace *space;extern cpBody *staticBody;void demo5_update(int ticks){ int steps = 2; cpFloat dt = 1.0f/60.0f/(cpFloat)steps; for(int i=0; i<steps; i++) cpSpaceStep(space, dt);}void demo5_init(void){ staticBody = cpBodyNew(INFINITY, INFINITY); cpResetShapeIdCounter(); space = cpSpaceNew(); space->iterations = 20; cpSpaceResizeActiveHash(space, 40.0f, 2999); cpSpaceResizeStaticHash(space, 40.0f, 999); space->gravity = cpv(0, -300); cpBody *body; cpShape *shape; // Vertexes for the dominos. int num = 4; cpVect verts[] = { cpv(-3,-20), cpv(-3, 20), cpv( 3, 20), cpv( 3,-20), }; // Add a floor. shape = cpSegmentShapeNew(staticBody, cpv(-600,-240), cpv(600,-240), 0.0f); shape->e = 1.0f; shape->u = 1.0f; cpSpaceAddStaticShape(space, shape); // Shared friction constant. cpFloat u = 0.6f; // Add the dominoes. Skim over this. It doesn't do anything fancy, and it's hard to follow. int n = 9; for(int i=1; i<=n; i++){ cpVect offset = cpv(-i*60/2.0f, (n - i)*52); for(int j=0; j<i; j++){ body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero)); body->p = cpvadd(cpv(j*60, -220), offset); cpSpaceAddBody(space, body); shape = cpPolyShapeNew(body, num, verts, cpvzero); shape->e = 0.0f; shape->u = u; cpSpaceAddShape(space, shape); body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero)); body->p = cpvadd(cpv(j*60, -197), offset); cpBodySetAngle(body, (cpFloat) M_PI/2.0f); cpSpaceAddBody(space, body); shape = cpPolyShapeNew(body, num, verts, cpvzero); shape->e = 0.0f; shape->u = u; cpSpaceAddShape(space, shape); if(j == (i - 1)) continue; body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero)); body->p = cpvadd(cpv(j*60 + 30, -191), offset); cpBodySetAngle(body, (cpFloat) M_PI/2.0f); cpSpaceAddBody(space, body); shape = cpPolyShapeNew(body, num, verts, cpvzero); shape->e = 0.0f; shape->u = u; cpSpaceAddShape(space, shape); } body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero)); body->p = cpvadd(cpv(-17, -174), offset); cpSpaceAddBody(space, body); shape = cpPolyShapeNew(body, num, verts, cpvzero); shape->e = 0.0f; shape->u = u; cpSpaceAddShape(space, shape); body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero)); body->p = cpvadd(cpv((i - 1)*60 + 17, -174), offset); cpSpaceAddBody(space, body); shape = cpPolyShapeNew(body, num, verts, cpvzero); shape->e = 0.0f; shape->u = u; cpSpaceAddShape(space, shape); } // Give the last domino a little tip.// body->w = -1;// body->v = cpv(-body->w*20, 0);}
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