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POTrying to rotate my sprite smoothly at a constant speed. But it decreases the speed
 

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  1. POTrying to rotate my sprite smoothly at a constant speed. But it decreases the speed
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    <p>(I'm using cocos2d for iphone) </p> <p>First I'll explain you my code: (the important parts) </p> <pre><code> -(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch * touch = [touches anyObject]; CGPoint location = [touch locationInView:[touch view]]; location = [[CCDirector sharedDirector] convertToGL:location]; float dstAngle = CC_RADIANS_TO_DEGREES(-ccpToAngle(ccpSub(location, plane.position))); plane.dstAngle = dstAngle; } -(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch * touch = [touches anyObject]; CGPoint location = [touch locationInView:[touch view]]; location = [[CCDirector sharedDirector] convertToGL:location]; float dstAngle = CC_RADIANS_TO_DEGREES(-ccpToAngle(ccpSub(location, plane.position))); plane.dstAngle = dstAngle; } </code></pre> <p>If I touch the screen I calculate the angle between my plane and the touch location.</p> <p>Now I set the "destination" angle of the plane. My "plane" is a subclass.</p> <p>In my header file I have these float values:</p> <pre><code>//this is in my plane subclass float diffAngle_; float startAngle_; float dstAngle_; float smoothRotationSpeed_; </code></pre> <p>EDIT: In my init of the layer I set the "smoothRotationSpeed" to a value. The "rotationTick" method IS scheduled. I have a tick method to rotate the plane (also in the plane subclass)</p> <pre><code>-(void)rotateTick:(ccTime)dt { startAngle_ = [self rotation]; if (startAngle_ &gt; 0) startAngle_ = fmodf(startAngle_, 360.0f); else startAngle_ = fmodf(startAngle_, -360.0f); diffAngle_ =dstAngle_ - startAngle_; if (diffAngle_ &gt; 180) diffAngle_ -= 360; if (diffAngle_ &lt; -180) diffAngle_ += 360; [self setRotation: startAngle_ + diffAngle_ * dt]; //smooth rotate } -(void)setSmoothRotationSpeed:(float)smoothRotationSpeed { [self schedule:@selector(rotateTick:)]; //this will be called if the "smoothRotationSpeed" value is changed } </code></pre> <p>The problem is now if I touch a location the sprites rotates to it correctly but at first it rotates a little bit fast and than it looses it's speed..</p> <p>The nearer it is to the destination angle the slower it moves...</p> <p>But I want it to move at a constant speed. This "constant" speed is defined in the "smoothRotationSpeed" value but how can I implement it in my code?</p> <p>If I set the interval to the "smoothRotationSpeed" value it wouldn't be smooth. It would lag.</p> <p>Would anyone like to help me please?</p>
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