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POJumpy CADisplayLink Animation
 

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  1. POJumpy CADisplayLink Animation
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    <p>As detailed in a previous post (<a href="https://stackoverflow.com/questions/17257252/cabasicanimation-animating-between-two-angles">Here</a>), I'm creating an animation that starts at an initial angle and moves to an ending angle. I've decided to use <code>CADisplayLink</code> for this animation because the animation needs to run as fast as possible during user input, so a <code>CALayer</code> with a <code>CAKeyframeAnimation</code> seemed like it would be too slow to achieve this.</p> <p>After implementing the <code>CADisplayLink</code>, which calls <code>setNeedsDisplay</code>, I do have the animation working, but it looks really bad because it chunks up the difference between endAngle and initialAngle into heavily visible blocks of angles instead of creating a continuous flow from one angle to the next. Here's the current code I have:</p> <pre><code>CGFloat newAngleToAnimate = animationProgress + ((endAngle-initialAngle)/kDrawDuration)*elapsedTime; // Use newAngleToAnimate to draw in drawInContext animationProgress = newAngleToAnimate; // Update the progress for the next frame. </code></pre> <p>Also, <code>kDrawDuration</code> is defined as <code>3.0f</code>, so I want the animation from <code>initialAngle</code> to <code>endAngle</code> to take 3.0 seconds. I break up the full circle (<code>2*M_PI</code> radians) into equal segments by calculating <code>2*M_PI / kNumAnglesInAnimation</code>, and preferably I want to animate one of those angles every frame, but somehow I still have to take <code>kDrawDuration</code> and <code>elapsedTime</code> into account, which I'm just not seeing how to achieve.</p> <p>Thanks for any help with fixing this!</p>
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