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Merge pull request #21 from openseadragon/pinchzoompoint

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patch for pinch zoom point.
This commit is contained in:
Chris Thatcher 2013-02-27 06:53:20 -08:00
commit 65cc3f55e9
1 changed files with 7 additions and 2 deletions
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9
src/mousetracker.js
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@ -695,6 +695,10 @@
THIS[ tracker.hash ].lastPinchDelta = THIS[ tracker.hash ].lastPinchDelta =
Math.abs( touchA.x - touchB.x ) + Math.abs( touchA.x - touchB.x ) +
Math.abs( touchA.y - touchB.y ); Math.abs( touchA.y - touchB.y );
THIS[ tracker.hash ].pinchMidpoint = new $.Point(
( touchA.x + touchB.x ) / 2 ,
( touchA.y + touchB.y ) / 2
);
//$.console.debug("pinch start : "+THIS[ tracker.hash ].lastPinchDelta); //$.console.debug("pinch start : "+THIS[ tracker.hash ].lastPinchDelta);
} }
@ -756,6 +760,7 @@
} }
if( event.touches.length + event.changedTouches.length == 2 ){ if( event.touches.length + event.changedTouches.length == 2 ){
THIS[ tracker.hash ].lastPinchDelta = null; THIS[ tracker.hash ].lastPinchDelta = null;
THIS[ tracker.hash ].pinchMidpoint = null;
//$.console.debug("pinch end"); //$.console.debug("pinch end");
} }
event.preventDefault(); event.preventDefault();
@ -961,8 +966,8 @@
onMouseWheelSpin( tracker, { onMouseWheelSpin( tracker, {
shift: false, shift: false,
pageX: ( event.touches[ 0 ].pageX + event.touches[ 1 ].pageX ) / 2, pageX: THIS[ tracker.hash ].pinchMidpoint.x,
pageY: ( event.touches[ 0 ].pageY + event.touches[ 1 ].pageY ) / 2, pageY: THIS[ tracker.hash ].pinchMidpoint.y,
detail:( detail:(
THIS[ tracker.hash ].lastPinchDelta > pinchDelta THIS[ tracker.hash ].lastPinchDelta > pinchDelta
) ? 1 : -1 ) ? 1 : -1