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Simpler, more accurate background positioning. Fixes #163

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Tom MacWright
2012-12-03 11:10:36 -05:00
parent 26ef972199
commit b63c97673d
1 changed files with 17 additions and 9 deletions
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js/id/renderer/background.js
+17 -9
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@@ -7,12 +7,15 @@ iD.Background = function() {
function background() {
var tiles = tile
.scale(projection.scale())
.translate(projection.translate())();
.translate(projection.translate())(),
z = Math.max(Math.log(projection.scale()) / Math.log(2) - 8, 0),
rz = Math.floor(z),
ts = 256 * Math.pow(2, z - rz),
tile_origin = [
projection.scale() / 2 - projection.translate()[0],
projection.scale() / 2 - projection.translate()[1]];
var image = this
.attr("transform", function() {
return "scale(" + tiles.scale + ")translate(" + tiles.translate + ")";
})
.selectAll("image")
.data(tiles, function(d) { return d; });
@@ -20,11 +23,15 @@ iD.Background = function() {
.remove();
image.enter().append("image")
.attr("xlink:href", source)
.attr("width", 1)
.attr("height", 1)
.attr("x", function(d) { return d[0]; })
.attr("y", function(d) { return d[1]; });
.attr("xlink:href", source);
image.attr('transform', function(d) {
return 'translate(' +
Math.round((d[0] * ts) - tile_origin[0]) + ',' +
Math.round((d[1] * ts) - tile_origin[1]) + ')';
})
.attr("width", ts)
.attr("height", ts);
}
background.projection = function(_) {
@@ -68,3 +75,4 @@ iD.Background.Bing = function (coord) {
.replace('{y}', coord[1])
.replace('{z}', coord[2]);
};