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Use streams better

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This commit is contained in:
John Firebaugh
2013-10-17 17:20:24 -04:00
parent bd1fac9c48
commit 4cce2e8d3a
1 changed files with 17 additions and 20 deletions
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37
js/id/svg.js
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@@ -13,29 +13,26 @@ iD.svg = {
};
},
Round: function () {
return d3.geo.transform({
point: function(x, y) { return this.stream.point(Math.floor(x), Math.floor(y)); }
});
},
Path: function(projection, graph, polygon) {
var cache = {},
path = d3.geo.path().projection(projection);
round = iD.svg.Round().stream,
project = projection.stream,
path = d3.geo.path()
.projection({stream: function(output) { return project(round(output)); }});
function result(entity) {
if (entity.id in cache) return cache[entity.id];
var buffer = '';
path.context({
beginPath: function() {},
moveTo: function(x, y) { buffer += 'M' + Math.floor(x) + ',' + Math.floor(y); },
lineTo: function(x, y) { buffer += 'L' + Math.floor(x) + ',' + Math.floor(y); },
arc: function() {},
closePath: function() { buffer += 'Z'; }
});
path(entity.asGeoJSON(graph, polygon));
return cache[entity.id] = buffer;
}
return result;
return function(entity) {
if (entity.id in cache) {
return cache[entity.id];
} else {
return cache[entity.id] = path(entity.asGeoJSON(graph, polygon));
}
};
},
OneWaySegments: function(projection, graph, dt) {