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Fewer function calls during bounds calculation

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This commit is contained in:
Tim Schaub
2013-03-04 18:55:20 +01:00
parent 0b05432faa
commit fae79dbc0f
1 changed files with 19 additions and 12 deletions
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31
src/ol/geom/linestring.js
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@@ -99,23 +99,30 @@ ol.geom.LineString.prototype.getCount = function() {
*/ */
ol.geom.LineString.prototype.getBounds = function() { ol.geom.LineString.prototype.getBounds = function() {
if (goog.isNull(this.bounds_)) { if (goog.isNull(this.bounds_)) {
var minX, var minX, minY = minX = Number.POSITIVE_INFINITY,
minY = minX = Number.POSITIVE_INFINITY, maxX, maxY = maxX = Number.NEGATIVE_INFINITY,
maxX, dimension = this.dimension,
maxY = maxX = Number.NEGATIVE_INFINITY,
vertices = this.vertices, vertices = this.vertices,
id = this.sharedId_, id = this.sharedId_,
count = vertices.getCount(id), count = vertices.getCount(id),
dimension = this.dimension, start = vertices.getStart(id),
end = start + (count * dimension),
coordinates = vertices.coordinates,
x, y, i; x, y, i;
for (i = 0; i < count; ++i) { for (i = start; i < end; i += dimension) {
x = vertices.get(id, i, 0); x = coordinates[i];
y = vertices.get(id, i, 1); y = coordinates[i + 1];
minX = Math.min(minX, x); if (x < minX) {
minY = Math.min(minY, y); minX = x;
maxX = Math.max(maxX, x); } else if (x > maxX) {
maxY = Math.max(maxY, y); maxX = x;
}
if (y < minY) {
minY = y;
} else if (y > maxY) {
maxY = y;
}
} }
this.bounds_ = new ol.Extent(minX, minY, maxX, maxY); this.bounds_ = new ol.Extent(minX, minY, maxX, maxY);
} }