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| <html><head><title>Truc_qui_se_deplace</title>
<script type="text/javascript">
<!--
var the_timeout;
var the_coords = new Array("500:100","250:40","350:280","50:120","190:60","380:400","250:50","30:340","500:100");
// function getAnchors()
// this function gets the two anchor points of a segment
// of the path and then calls moveDiv() to move the
// DIV along that segment
//
function getAnchors(array_position)
{
var first_anchor = the_coords[array_position];
var second_anchor = the_coords[array_position+1];
array_position++;
if (array_position == the_coords.length-1)
{
array_position = 0;
}
moveDiv(array_position, first_anchor, second_anchor, 0, 0);
}
// function moveDiv()
// this function moves the DIV along a segment of the path
// based on the anchor points. It will keep calling
// itself with a setTimeout() until the DIV is at the end
// of the segment
//
function moveDiv(array_position, anchor_one, anchor_two,
horizontal_step_size, vertical_step_size)
{
var the_style = getStyleObject("myDiv");
if (the_style)
{
// get the first anchor
//
var first_points = anchor_one.split(":");
var first_left = parseInt(first_points[0]);
var first_top = parseInt(first_points[1]);
// get the second anchor
//
var second_points = anchor_two.split(":");
var second_left = parseInt(second_points[0]);
var second_top = parseInt(second_points[1]);
// if we don't know the step sizes to move the DIV, figure them out
//
if ((horizontal_step_size == 0) && (vertical_step_size == 0))
{
horizontal_step_size =
getStepSize(anchor_one, anchor_two, 0);
vertical_step_size =
getStepSize(anchor_one, anchor_two, 1);
}
// figure out the new coordinates
//
var new_left = first_left + horizontal_step_size;
var new_top = first_top + vertical_step_size;
// if we're at the end of the segment, set the coordinates to
// move the DIV to the end
//
if (atEndOfPath(horizontal_step_size, second_left, new_left)
||(atEndOfPath(vertical_step_size, second_top, new_top)))
{
new_left = second_left;
new_top = second_top;
}
// add the px or don't, depending on the browser
if (!document.layers)
{
new_left = new_left + "px";
new_top = new_top + "px";
}
// now actually move the DIV
//
the_style.left = new_left;
the_style.top = new_top;
// if we're at the end of the segment, get new anchors
// otherwise, call moveDiv() again with a new starting point
// along the segment
//
if ((parseInt(new_left) == parseInt(second_left)) &&
(parseInt(new_top) == parseInt(second_top)))
{
getAnchors(array_position);
}
else
{
var new_anchor_one = new_left + ":" + new_top;
var timeout_string = "moveDiv(" +
array_position + ", '" + new_anchor_one + "', '" +
anchor_two + "', " + horizontal_step_size + "," +
vertical_step_size + ");";
the_timeout = setTimeout(timeout_string, 50);
}
}
}
// function getStepSize()
// this figures out how much to move the DIV each time
//
function getStepSize(anchor_one, anchor_two, position)
{
var first_points = anchor_one.split(":");
var first_number = parseInt(first_points[position]);
var second_points = anchor_two.split(":");
var second_number = parseInt(second_points[position]);
var step_size = Math.round((second_number - first_number)/10);
return step_size;
}
// function atEndOfPath()
// if the DIV is about to be moved past the end point of
// the segment, this will return true. Otherwise, it will
// return false.
//
function atEndOfPath(the_step_size, second_number, new_number)
{
var the_end = false;
if (((the_step_size > 0) && (new_number > second_number)) ||
((the_step_size < 0) && (new_number < second_number)))
{
the_end = true;
}
return the_end;
}
function getStyleObject(objectId) {
// cross-browser function to get an object's style object given its
if(document.getElementById && document.getElementById(objectId)) {
// W3C DOM
return document.getElementById(objectId).style;
} else if (document.all && document.all(objectId)) {
// MSIE 4 DOM
return document.all(objectId).style;
} else if (document.layers && document.layers[objectId]) {
// NN 4 DOM.. note: this won't find nested layers
return document.layers[objectId];
} else {
return false;
}
} // getStyleObject
// -->
</script>
</head>
<body>
<div id = "myDiv" style="position:absolute; top:100px; left:500px;"><img src="truc.gif">
</div>
<br>
<a href="#" onClick="getAnchors(0); return false;">start</a> <br>
<a href="#" onClick="clearTimeout(the_timeout); return false;">stop</a>
</body>
</html> |
