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Function for getting extent intersection

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This commit is contained in:
Tim Schaub
2014-07-06 17:11:39 -06:00
parent 9de010c791
commit 42f953d08d
2 changed files with 67 additions and 6 deletions
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49
src/ol/extent.js
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@@ -418,7 +418,11 @@ ol.extent.extendXY = function(extent, x, y) {
* @return {number} Area.
*/
ol.extent.getArea = function(extent) {
return ol.extent.getWidth(extent) * ol.extent.getHeight(extent);
var area = 0;
if (!ol.extent.isEmpty(extent)) {
area = ol.extent.getWidth(extent) * ol.extent.getHeight(extent);
}
return area;
};
@@ -511,11 +515,44 @@ ol.extent.getHeight = function(extent) {
* @return {number} Intersection area.
*/
ol.extent.getIntersectionArea = function(extent1, extent2) {
var minX = Math.max(extent1[0], extent2[0]);
var minY = Math.max(extent1[1], extent2[1]);
var maxX = Math.min(extent1[2], extent2[2]);
var maxY = Math.min(extent1[3], extent2[3]);
return Math.max(0, maxX - minX) * Math.max(0, maxY - minY);
var intersection = ol.extent.getIntersection(extent1, extent2);
return ol.extent.getArea(intersection);
};
/**
* Get the intersection of two extents.
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent 2.
* @param {ol.Extent=} opt_extent Optional extent to populate with intersection.
* @return {ol.Extent} Intersecting extent.
*/
ol.extent.getIntersection = function(extent1, extent2, opt_extent) {
var intersection = goog.isDef(opt_extent) ?
opt_extent : ol.extent.createEmpty();
if (ol.extent.intersects(extent1, extent2)) {
if (extent1[0] > extent2[0]) {
intersection[0] = extent1[0];
} else {
intersection[0] = extent2[0];
}
if (extent1[1] > extent2[1]) {
intersection[1] = extent1[1];
} else {
intersection[1] = extent2[1];
}
if (extent1[2] < extent2[2]) {
intersection[2] = extent1[2];
} else {
intersection[2] = extent2[2];
}
if (extent1[3] < extent2[3]) {
intersection[3] = extent1[3];
} else {
intersection[3] = extent2[3];
}
}
return intersection;
};