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POclone an existing ball spirte and the object in box2d cocos2d
 

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  1. POclone an existing ball spirte and the object in box2d cocos2d
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    <p>So what I want is the following: I have 1 ball that bounces around on my screen, this al goes well + I can kick it in a random direction left or right. I am new to box2d and I want multiple balls in my app. I followed a good tutorial on the net and I pretty much understand what I have made but I am trying for a while now to copy everything from ball 1 including the body en just "2" after it so I have 2 identical balls that bounce around the screen. No succes though.</p> <p>Is there an easy way to simple "clone" a sprite + it's object?</p> <p>This is the code :)</p> <pre><code>#import "HelloWorldLayer.h" @implementation HelloWorldLayer + (id)scene { CCScene *scene = [CCScene node]; HelloWorldLayer *layer = [HelloWorldLayer node]; [scene addChild:layer]; return scene; } - (id)init { if ((self=[super init])) { CGSize winSize = [CCDirector sharedDirector].winSize; // Create sprite and add it to the layer _ball = [CCSprite spriteWithFile:@"ball.png" rect:CGRectMake(0, 0, 52, 52)]; _ball.position = ccp(100, 300); [self addChild:_ball]; // Create a world b2Vec2 gravity = b2Vec2(0.0f, -8.0f); _world = new b2World(gravity); // Create ball body and shape b2BodyDef ballBodyDef; ballBodyDef.type = b2_dynamicBody; ballBodyDef.position.Set(100/PTM_RATIO, 300/PTM_RATIO); ballBodyDef.userData = _ball; _body = _world-&gt;CreateBody(&amp;ballBodyDef); b2CircleShape circle; circle.m_radius = 26.0/PTM_RATIO; b2FixtureDef ballShapeDef; ballShapeDef.shape = &amp;circle; ballShapeDef.density = 1.0f; ballShapeDef.friction = 0.2f; ballShapeDef.restitution = 0.4f; _body-&gt;CreateFixture(&amp;ballShapeDef); [self schedule:@selector(tick:)]; // Create edges around the entire screen b2BodyDef groundBodyDef; groundBodyDef.position.Set(0,0); b2Body *groundBody = _world-&gt;CreateBody(&amp;groundBodyDef); b2EdgeShape groundEdge; b2FixtureDef boxShapeDef; boxShapeDef.shape = &amp;groundEdge; //WALL DEFINITIONS //floor wall groundEdge.Set(b2Vec2(0,0), b2Vec2(winSize.width/PTM_RATIO, 0)); groundBody-&gt;CreateFixture(&amp;boxShapeDef); //roof wall groundEdge.Set(b2Vec2(0,0), b2Vec2(0,winSize.height/PTM_RATIO)); groundBody-&gt;CreateFixture(&amp;boxShapeDef); //left wall groundEdge.Set(b2Vec2(0, winSize.height/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO)); groundBody-&gt;CreateFixture(&amp;boxShapeDef); //right wall groundEdge.Set(b2Vec2(winSize.width/PTM_RATIO, winSize.height/PTM_RATIO), b2Vec2(winSize.width/PTM_RATIO, 0)); groundBody-&gt;CreateFixture(&amp;boxShapeDef); //Do the kick every 5 seconds //[self schedule:@selector(kick) interval:5.0]; [self setTouchEnabled:YES]; } return self; } - (void)tick:(ccTime) dt { _world-&gt;Step(dt, 10, 10); for(b2Body *b = _world-&gt;GetBodyList(); b; b=b-&gt;GetNext()) { if (b-&gt;GetUserData() != NULL) { CCSprite *ballData = (CCSprite *)b-&gt;GetUserData(); ballData.position = ccp(b-&gt;GetPosition().x * PTM_RATIO, b-&gt;GetPosition().y * PTM_RATIO); ballData.rotation = -1 * CC_RADIANS_TO_DEGREES(b-&gt;GetAngle()); } } } //do the kick every 5 seconds /*- (void)kick { b2Vec2 force = b2Vec2(30, 30); _body-&gt;ApplyLinearImpulse(force,_body-&gt;GetPosition()); }*/ - (void)ccTouchesBegan:(UITouch *)touch withEvent:(UIEvent *)event { randomGetal = ((arc4random() % 20) - 10); b2Vec2 force = b2Vec2(randomGetal, 10); _body-&gt;ApplyLinearImpulse(force, _body-&gt;GetPosition()); } - (void)dealloc { delete _world; _body = NULL; _world = NULL; [super dealloc]; } @end </code></pre>
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    1. USLander Iphone
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    1. COCan't you just make more balls using that same code?
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