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POHow to simulate a gravity for one sprite in cocos2d without a physics engine?
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copied!<p>I would like to simulate "gravity" for one sprite.</p> <p>I defined a CGPoint which holds the gravity values. And I have tick method.</p> <pre><code>//in my init I defined this: gravity = ccp(0.0f, -1.0f); -(void)tick:(ccTime) dt { if (enableGravity_) { //simulate gravity velocity_.x += gravity_.x; velocity_.y += gravity_.y; self.position = CGPointMake(position_.x + velocity_.x, position_.y + velocity_.y); } if (isAcceleratingEnabled_) { //I move my sprite here float angle = self.rotation; float vx = cos(angle * M_PI / 180) * acceleratingSpeed_; float vy = sin(angle * M_PI / 180) * -acceleratingSpeed_; CGPoint direction = ccp(vx, vy); [self setPosition:ccpAdd(self.position, direction)]; } </code></pre> <p>}</p> <p><strong>EDIT</strong>: the problem now is..I'm moving my sprite if "isAccelerationEnabled" is YES. And it's not smooth when I move the sprite like that. If I move my sprite upwards and than disable the "isAcceleration" it won't move upwards anymore but the gravity will INSTANTLY pull my sprite down. I don't know how to use the velocity with this code:</p> <pre><code>[self setPosition:ccpAdd(self.position, direction)]; </code></pre> <hr> <p>Now this isn't a really smooth solution to simulate gravity.</p> <p>This applies the gravity force instantly to the sprite.</p> <p>But I want the effect that the sprite falls smoothly. Like real objects fell to earth.</p> <p>Btw: I also apply some upward forces to the sprite.</p>

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