/* 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 demo2_update(int ticks){	int steps = 1;	cpFloat dt = 1.0f/60.0f/(cpFloat)steps;		for(int i=0; i<steps; i++){		cpSpaceStep(space, dt);	}}void demo2_init(void){	staticBody = cpBodyNew(INFINITY, INFINITY);		cpResetShapeIdCounter();		space = cpSpaceNew();	space->iterations = 20;	cpSpaceResizeStaticHash(space, 40.0f, 1000);	cpSpaceResizeActiveHash(space, 40.0f, 1000);	space->gravity = cpv(0, -100);		cpBody *body;	cpShape *shape;		int num = 4;	cpVect verts[] = {		cpv(-15,-15),		cpv(-15, 15),		cpv( 15, 15),		cpv( 15,-15),	};		// Create segments around the edge of the screen.	shape = cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(-320,240), 0.0f);	shape->e = 1.0f; shape->u = 1.0f;	cpSpaceAddStaticShape(space, shape);	shape = cpSegmentShapeNew(staticBody, cpv(320,-240), cpv(320,240), 0.0f);	shape->e = 1.0f; shape->u = 1.0f;	cpSpaceAddStaticShape(space, shape);	shape = cpSegmentShapeNew(staticBody, cpv(-320,-240), cpv(320,-240), 0.0f);	shape->e = 1.0f; shape->u = 1.0f;	cpSpaceAddStaticShape(space, shape);		// Add lots of boxes.	for(int i=0; i<14; i++){		for(int j=0; j<=i; j++){			body = cpBodyNew(1.0f, cpMomentForPoly(1.0f, num, verts, cpvzero));			body->p = cpv(j*32 - i*16, 300 - i*32);			cpSpaceAddBody(space, body);			shape = cpPolyShapeNew(body, num, verts, cpvzero);			shape->e = 0.0f; shape->u = 0.8f;			cpSpaceAddShape(space, shape);		}	}		// Add a ball to make things more interesting	cpFloat radius = 15.0f;	body = cpBodyNew(10.0f, cpMomentForCircle(10.0f, 0.0f, radius, cpvzero));	body->p = cpv(0, -240 + radius);//	body->v = cpv(10, 0);	cpSpaceAddBody(space, body);	shape = cpCircleShapeNew(body, radius, cpvzero);	shape->e = 0.0f; shape->u = 0.9f;	cpSpaceAddShape(space, shape);}