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Blitmask/ThrowProps > Infinite scroll

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I'm testing Blitmask and ThrowProps with this demo : https://greensock.com/throwprops-as


I'd like to use infinite scrolling for a touch app, so I passed Blitmask's wrap property to 'true' and I removed ThrowProps min and max.


It works except I have a bug when scrolling before or after the original height (not sure I'm clear).


Sorry, even in french it's hard to explain, so in english.. ;-)


Let me explain :


- When I scroll on the original text (not looped by wrap mode) it works perfectly



- But let's say I scroll lower than the original part of the text, mouse up, than scroll again from there, at mousemove, it jumps randomly anywhere else..


Here's my FLA : https://www.dropbox.com/s/x16i5olppd5qeva/BlitmaskTest.fla?dl=0








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there is code in the mousemove handler that adjusts for the content to overscroll slightly when you reach the bounds. this code will not work well when you want an infinite wrapping scroll. please try updating the mouseMoveHandler() function with the following


function mouseMoveHandler(event:MouseEvent):void {
var y:Number = this.mouseY - yOffset;
//if mc's position exceeds the bounds, make it drag only half as far with each mouse movement (like iPhone/iPad behavior)

    /* you don't need this if wrap is true 
if (y > bounds.top) {
mc.y = (y + bounds.top) * 0.5;
} else if (y < bounds.top - yOverlap) {
mc.y = (y + bounds.top - yOverlap) * 0.5;
} else {



mc.y = y;

var t:uint = getTimer();
//if the frame rate is too high, we won't be able to track the velocity as well, so only update the values 20 times per second
if (t - t2 > 50) {
y2 = y1;
t2 = t1;
y1 = mc.y;
t1 = t;
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and... VOILA !


thank you very much Carl.

it works perfectly.

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