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Fix trembling on zoom in

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As you zoom in, the rounding error in translate was multiplied by scale
because it was applied post-translate (which was rounded). This seems
to fix the issue.
This commit is contained in:
Vladimir Agafonkin
2013-11-26 21:38:02 +02:00
committed by John Firebaugh
parent 9e4b29f68a
commit d2df161575
1 changed files with 3 additions and 4 deletions
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js/id/renderer/map.js
+3 -4
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@@ -176,14 +176,13 @@ iD.Map = function(context) {
.scale(d3.event.scale / (2 * Math.PI));
var scale = d3.event.scale / transformStart[0],
tX = Math.round(d3.event.translate[0] / scale - transformStart[1][0]),
tY = Math.round(d3.event.translate[1] / scale - transformStart[1][1]);
tX = Math.round((d3.event.translate[0] / scale - transformStart[1][0]) * scale),
tY = Math.round((d3.event.translate[1] / scale - transformStart[1][1]) * scale);
var transform =
'scale(' + scale + ')' +
(iD.detect().opera ?
'translate(' + tX + 'px,' + tY + 'px)' :
'translate3d(' + tX + 'px,' + tY + 'px, 0)');
'translate3d(' + tX + 'px,' + tY + 'px, 0)') + ' scale(' + scale + ')';
transformed = true;
supersurface.style(transformProp, transform);