/* 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);}