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Improve internal algorithm for TransformGesture

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This commit is contained in:
Pavel fljot 2012-07-11 13:28:43 +03:00
parent f8149935db
commit 7be7c8c40a
1 changed files with 47 additions and 37 deletions
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84
src/org/gestouch/gestures/TransformGesture.as
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@ -99,51 +99,61 @@ package org.gestouch.gestures
var prevLocation:Point = _location.clone();
updateLocation();
var recognized:Boolean = true;
var currTransformVector:Point;
if (state == GestureState.POSSIBLE && slop > 0 && touch.locationOffset.length < slop)
if (state == GestureState.POSSIBLE)
{
recognized = false;
if (slop > 0 && touch.locationOffset.length < slop)
{
// Not recognized yet
if (_touch2)
{
// Recalculate _transformVector to avoid initial "jump" on recognize
_transformVector = _touch2.location.subtract(_touch1.location);
}
return;
}
}
if (recognized)
if (_touch2 && !currTransformVector)
{
var prevLocalLocation:Point;
var offsetX:Number = _location.x - prevLocation.x;
var offsetY:Number = _location.y - prevLocation.y;
var scale:Number = 1;
var rotation:Number = 0;
if (_touch2)
currTransformVector = _touch2.location.subtract(_touch1.location);
}
var prevLocalLocation:Point;
var offsetX:Number = _location.x - prevLocation.x;
var offsetY:Number = _location.y - prevLocation.y;
var scale:Number = 1;
var rotation:Number = 0;
if (_touch2)
{
rotation = Math.atan2(currTransformVector.y, currTransformVector.x) - Math.atan2(_transformVector.y, _transformVector.x);
rotation *= GestureUtils.RADIANS_TO_DEGREES;
scale = currTransformVector.length / _transformVector.length;
_transformVector = _touch2.location.subtract(_touch1.location);
}
if (state == GestureState.POSSIBLE)
{
if (setState(GestureState.BEGAN) && hasEventListener(TransformGestureEvent.GESTURE_TRANSFORM))
{
var currTransformVector:Point = _touch2.location.subtract(_touch1.location);
rotation = Math.atan2(currTransformVector.y, currTransformVector.x) - Math.atan2(_transformVector.y, _transformVector.x);
rotation *= GestureUtils.RADIANS_TO_DEGREES;
scale = currTransformVector.length / _transformVector.length;
_transformVector = _touch2.location.subtract(_touch1.location);
// Note that we dispatch previous location point which gives a way to perform
// accurate UI redraw. See examples project for more info.
prevLocalLocation = targetAdapter.globalToLocal(prevLocation);
dispatchEvent(new TransformGestureEvent(TransformGestureEvent.GESTURE_TRANSFORM, false, false, GestureState.BEGAN,
prevLocation.x, prevLocation.y, prevLocalLocation.x, prevLocalLocation.y, scale, scale, rotation, offsetX, offsetY));
}
if (state == GestureState.POSSIBLE)
}
else
{
if (setState(GestureState.CHANGED) && hasEventListener(TransformGestureEvent.GESTURE_TRANSFORM))
{
if (setState(GestureState.BEGAN) && hasEventListener(TransformGestureEvent.GESTURE_TRANSFORM))
{
// Note that we dispatch previous location point which gives a way to perform
// accurate UI redraw. See examples project for more info.
prevLocalLocation = targetAdapter.globalToLocal(prevLocation);
dispatchEvent(new TransformGestureEvent(TransformGestureEvent.GESTURE_TRANSFORM, false, false, GestureState.BEGAN,
prevLocation.x, prevLocation.y, prevLocalLocation.x, prevLocalLocation.y, scale, scale, rotation, offsetX, offsetY));
}
}
else
{
if (setState(GestureState.CHANGED) && hasEventListener(TransformGestureEvent.GESTURE_TRANSFORM))
{
// Note that we dispatch previous location point which gives a way to perform
// accurate UI redraw. See examples project for more info.
prevLocalLocation = targetAdapter.globalToLocal(prevLocation);
dispatchEvent(new TransformGestureEvent(TransformGestureEvent.GESTURE_TRANSFORM, false, false, GestureState.CHANGED,
prevLocation.x, prevLocation.y, prevLocalLocation.x, prevLocalLocation.y, scale, scale, rotation, offsetX, offsetY));
}
// Note that we dispatch previous location point which gives a way to perform
// accurate UI redraw. See examples project for more info.
prevLocalLocation = targetAdapter.globalToLocal(prevLocation);
dispatchEvent(new TransformGestureEvent(TransformGestureEvent.GESTURE_TRANSFORM, false, false, GestureState.CHANGED,
prevLocation.x, prevLocation.y, prevLocalLocation.x, prevLocalLocation.y, scale, scale, rotation, offsetX, offsetY));
}
}
}