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POJavascript zoom and rotate using gesturechange and gestureend
 

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  1. POJavascript zoom and rotate using gesturechange and gestureend
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    <p>I am working on some touch events and gestures, I want to be able to zoom and rotate the object, I have successfully made it draggable but the gestures are giving me trouble. The gestures are working but they are choppy, whenever you pinch it to zoom in or zoom out or try to rotate it, it jumps from finger to finger. </p> <p>Here is my code for reference. </p> <pre><code>var width = 300; var height = 300; var rotation = 0; $('.dynamic').live("gesturechange gestureend", function(e){ var orig = e.originalEvent; if(e.type == 'gesturechange'){ e.preventDefault(); $(this).css("width", parseFloat(width) * orig.scale); $(this).css("height", parseFloat(height) * orig.scale); $(this).css("-webkit-transform","rotate(" + ((parseFloat(rotation) + orig.rotation) % 360) + "deg)"); }else if(e.type == 'gestureend'){ a.w[ids] = parseFloat(width) * orig.scale; a.h[ids] = parseFloat(height) * orig.scale; a.rotation[ids] = (parseFloat(rotation) + orig.rotation) % 360; } }); </code></pre> <p>Are there anyways to make this smooth, and prevent it from jumping from fingers, or is the approach I took wrong. In need of some tips and tricks and help</p> <p>found a solution </p> <p>Seems like the my touch event for drag interfered with the gestures thats why it kept jumping from finger to finger, the way around this was to not use gestures instead count the touches on the object and use touch start,end and change instead.</p> <p>Here is the code</p> <pre><code>var touches = 0; var width = 300; var height = 300; var rotation = 0; $('.dynamic').live("touchstart touchmove touchend", function(e){ var orig = e.originalEvent; if(e.type == 'touchstart'){ if(orig.touches.length == 1){ touches = 1; }else if(orig.touches.length == 2){ touches = 2; } }else if(e.type == 'touchmove'){ e.preventDefault(); if(touches == 2){ $(this).css("width", parseFloat(width) * orig.scale); $(this).css("height", parseFloat(height) * orig.scale); $(this).css("-webkit-transform","rotate(" + ((parseFloat(rotation) + orig.rotation) % 360) + "deg)"); } }else if(e.type == 'touchend'){ if(touches == 2){ a.w[ids] = parseFloat(width) * orig.scale; a.h[ids] = parseFloat(height) * orig.scale; a.rotation[ids] = (parseFloat(rotation) + orig.rotation) % 360; } } }); </code></pre>
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      1. POJavascript zoom and rotate using gesturechange and gestureend
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    1. COMany thanks for posting your answer! The usual thing to do would be to post it as an answer, rather than editing it into the question. (There's nothing wrong with answering your own question.)
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      1. USRichieHindle
    2. COit does not let me answer it just yet since I am new on here
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    3. CODid your first approach work on Android 2.x? I want to support pinch gesture but the second approach (fine-grained touch support) only works on iOS (and Android 3.0/tablets, and WebOS?). Thanks for posting your solution!
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      1. POJavascript zoom and rotate using gesturechange and gestureend
      1. USChris Bosco
 

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