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Zoom relative to the cursor position

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This commit is contained in:
Madhura Jayaratne 2011-05-31 23:19:53 +05:30
parent e71db6482c
commit aa7c7d771d
1 changed files with 21 additions and 7 deletions
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28
js/tbl_gis_visualization.js
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@ -10,7 +10,8 @@
var x = 0;
var y = 0;
var scale = 1;
var orig_scale = 1;
var shiftX;
var shiftY;
var svg;
/**
@ -63,6 +64,9 @@ function zoomAndPan() {
* Displaying tooltips for GIS objects.
*/
$(document).ready(function() {
shiftX = $('#placeholder svg').attr('width') / 6;
shiftY = $('#placeholder svg').attr('height') / 6;
$('#placeholder').svg({
onLoad: function(svg_ref) {
svg = svg_ref;
@ -76,13 +80,18 @@ $(document).ready(function() {
if (delta > 0) {
//zoom in
scale *= 1.5;
shiftX *= 1.5;
shiftY *= 1.5;
x -= shiftX;
y -= shiftY;
zoomAndPan();
} else {
//zoom out
scale /= 1.5;
if (scale <= 0.5 * orig_scale) {
scale = 0.5 * orig_scale;
}
x += shiftX;
y += shiftY;
shiftX /= 1.5;
shiftY /= 1.5;
zoomAndPan();
}
return true;
@ -106,6 +115,10 @@ $(document).ready(function() {
$('#placeholder').live('dblclick', function() {
scale *= 1.5;
shiftX *= 1.5;
shiftY *= 1.5;
x -= shiftX;
y -= shiftY;
zoomAndPan();
});
@ -113,9 +126,10 @@ $(document).ready(function() {
e.preventDefault();
//zoom out
scale /= 1.5;
if (scale <= 0.5 * orig_scale) {
scale = 0.5 * orig_scale;
}
x += shiftX;
y += shiftY;
shiftX /= 1.5;
shiftY /= 1.5;
zoomAndPan();
});