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05.16.2008 at 05:07PM PDT, ID: 23410040
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8.2

Flying image too fast to see (flying script)

Zone: JavaScript
I pieced together a simple, generic script originally from http://www.dhtmlgoodies.com/index.html?whichScript=fly-to-basket. My code seems to work fine, but no matter how much I slow it down (in the flyingSpeed variable), I can't see it 'fly'. I even slowed it down to 0.5 and I still can't see it. The reason why I know it works is because if I put an alert in there, I see it move between each alert in the while loop. Can anyone see what's wrong with this??
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<html>
<head>
<script type="text/javascript">
function FindAbsolutePosition(obj) 
{
	var curtop = curleft = 0;
	
	if (obj.offsetParent) 
	{
		do 
		{
			curtop += obj.offsetTop;
			curleft += obj.offsetLeft;
		} while (obj = obj.offsetParent);
	}
	
	return {top:curtop, left:curleft};
}
 
function FlyToDestination(flyingID, destID)
{
	var flyingSpeed = 25;
	var source = document.getElementById(flyingID);
	var destination = document.getElementById(destID);
 
	// Get source position
	source_x = FindAbsolutePosition(source)['left'];
	source_y = FindAbsolutePosition(source)['top'];
 
	// Get destination position
	dest_x = FindAbsolutePosition(destination)['left'];
	dest_y = FindAbsolutePosition(destination)['top'];
 
	// Get relative postioning
	diffX = dest_x - source_x;
	diffY = dest_y - source_y;
 
	// Start clone creation
	var contentCopy = source.cloneNode(true);
	contentCopy.id='';
	flyingDiv = document.createElement('DIV');
	flyingDiv.style.position = 'absolute';
	document.body.appendChild(flyingDiv);
	flyingDiv.innerHTML = '';
	flyingDiv.style.left = source_x + 'px';
	flyingDiv.style.top = source_y + 'px';
	flyingDiv.appendChild(contentCopy);
	flyingDiv.style.display='block';
	flyingDiv.style.width = source.offsetWidth + 'px';
 
	// Start flying!
	while (flyingDiv.style.display == 'block')
	{
		var maxDiff = Math.max(Math.abs(diffX), Math.abs(diffY));
		var moveX = (diffX / maxDiff) * flyingSpeed;
		var moveY = (diffY / maxDiff) * flyingSpeed;	
 
		source_x = source_x + moveX;
		source_y = source_y + moveY;
 
alert('X = ' + source_x + '\nY = ' + source_y);
 
		flyingDiv.style.left = Math.round(source_x) + 'px';
		flyingDiv.style.top = Math.round(source_y) + 'px';	
		
		// Hide after landed
		if (moveX > 0 && source_x > dest_x)
			flyingDiv.style.display = 'none';		
		
		if (moveX < 0 && source_x < dest_x)
			flyingDiv.style.display = 'none';	
	}	
alert('Done');
}
</script>
</head>
<body>
 
<div id="destination">
	Destination is here
</div>
 
<br><br><br><br><br><br><br><br><br><br><br><br><br><br>
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<img id="source" src="http://tbn0.google.com/images?q=tbn:ylwf-XkJVe34QM:http://www.maip.com/media/images/Google%2520Logo.jpg" />
<br>
<button onclick="FlyToDestination('source', 'destination');">Fly to Destination</button>
 
</body>
</html>
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Question Stats
Zone: Programming
Question Asked By: bemara57
Solution Provided By: YetiNZ
Participating Experts: 1
Solution Grade: A
Views: 0
Translate:
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05.16.2008 at 06:53PM PDT, ID: 21587696
YetiNZ:

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05.16.2008 at 06:53PM PDT, ID: 21587696
YetiNZ:
you forgot the setTimeout line which makes the 'flying' function repeat every 10 milliseconds. Try this:
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<script type="text/javascript">
	var flyingSpeed = 25;
	var source;
	var destination;
	var source_x;
	var source_y;
	var dest_x;
	var dest_y;
 	var diffX;
	var diffY;
	var flyingDiv;
 
function FindAbsolutePosition(obj) 
{
	var curtop = curleft = 0;
	
	if (obj.offsetParent) 
	{
		do 
		{
			curtop += obj.offsetTop;
			curleft += obj.offsetLeft;
		} while (obj = obj.offsetParent);
	}
	
	return {top:curtop, left:curleft};
}
 
function FlyToDestination(flyingID, destID)
{
	source = document.getElementById(flyingID);
	destination = document.getElementById(destID);
 
	// Get source position
	source_x = FindAbsolutePosition(source)['left'];
	source_y = FindAbsolutePosition(source)['top'];
 
	// Get destination position
	dest_x = FindAbsolutePosition(destination)['left'];
	dest_y = FindAbsolutePosition(destination)['top'];
 
	// Get relative postioning
	diffX = dest_x - source_x;
	diffY = dest_y - source_y;
 
	// Start clone creation
	var contentCopy = source.cloneNode(true);
	contentCopy.id='';
	flyingDiv = document.createElement('DIV');
	flyingDiv.style.position = 'absolute';
	document.body.appendChild(flyingDiv);
	flyingDiv.innerHTML = '';
	flyingDiv.style.left = source_x + 'px';
	flyingDiv.style.top = source_y + 'px';
	flyingDiv.appendChild(contentCopy);
	flyingDiv.style.display='block';
	flyingDiv.style.width = source.offsetWidth + 'px';
 
	 flyToDestination();
//alert('Done');
}
 
function flyToDestination(){
	// Start flying!
		var maxDiff = Math.max(Math.abs(diffX), Math.abs(diffY));
		var moveX = (diffX / maxDiff) * flyingSpeed;
		var moveY = (diffY / maxDiff) * flyingSpeed;	
 
		source_x = source_x + moveX;
		source_y = source_y + moveY;
 
//alert('X = ' + source_x + '\nY = ' + source_y);
 
		flyingDiv.style.left = Math.round(source_x) + 'px';
		flyingDiv.style.top = Math.round(source_y) + 'px';	
		
		// Hide after landed
		if (moveX > 0 && source_x > dest_x)
			flyingDiv.style.display = 'none';		
		
		if (moveX < 0 && source_x < dest_x)
			flyingDiv.style.display = 'none';
 
 		if(flyingDiv.style.display=='block')setTimeout('flyToDestination()',10); 
}
</script>
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20080236-EE-VQP-29 / EE_QW_2_20070628