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General purpose getCorner function for extents

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This commit is contained in:
Tim Schaub
2013-10-11 17:19:59 -06:00
parent 711c4bbc8c
commit dd5e7693da
2 changed files with 63 additions and 0 deletions
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37
src/ol/extent.js
View File

@@ -1,5 +1,6 @@
goog.provide('ol.Extent');
goog.provide('ol.extent');
goog.provide('ol.extent.Corner');
goog.provide('ol.extent.Relationship');
goog.require('goog.asserts');
@@ -17,6 +18,18 @@ goog.require('ol.TransformFunction');
ol.Extent;
/**
* Extent corner.
* @enum {string}
*/
ol.extent.Corner = {
BOTTOM_LEFT: 'bottom-left',
BOTTOM_RIGHT: 'bottom-right',
TOP_LEFT: 'top-left',
TOP_RIGHT: 'top-right'
};
/**
* Relationship to an extent.
* @enum {number}
@@ -456,6 +469,30 @@ ol.extent.getCenter = function(extent) {
};
/**
* Get a corner coordinate of an extent.
* @param {ol.Extent} extent Extent.
* @param {ol.extent.Corner} corner Corner.
* @return {ol.Coordinate} Corner coordinate.
*/
ol.extent.getCorner = function(extent, corner) {
var coordinate;
if (corner === ol.extent.Corner.BOTTOM_LEFT) {
coordinate = ol.extent.getBottomLeft(extent);
} else if (corner === ol.extent.Corner.BOTTOM_RIGHT) {
coordinate = ol.extent.getBottomRight(extent);
} else if (corner === ol.extent.Corner.TOP_LEFT) {
coordinate = ol.extent.getTopLeft(extent);
} else if (corner === ol.extent.Corner.TOP_RIGHT) {
coordinate = ol.extent.getTopRight(extent);
} else {
goog.asserts.fail('Invalid corner: %s', corner);
}
goog.asserts.assert(goog.isDef(coordinate));
return coordinate;
};
/**
* @param {ol.Extent} extent1 Extent 1.
* @param {ol.Extent} extent2 Extent 2.

26
test/spec/ol/extent.test.js
View File

@@ -177,6 +177,31 @@ describe('ol.extent', function() {
});
});
describe('getCorner', function() {
var extent = [1, 2, 3, 4];
it('gets the bottom left', function() {
var corner = ol.extent.Corner.BOTTOM_LEFT;
expect(ol.extent.getCorner(extent, corner)).to.eql([1, 2]);
});
it('gets the bottom right', function() {
var corner = ol.extent.Corner.BOTTOM_RIGHT;
expect(ol.extent.getCorner(extent, corner)).to.eql([3, 2]);
});
it('gets the top left', function() {
var corner = ol.extent.Corner.TOP_LEFT;
expect(ol.extent.getCorner(extent, corner)).to.eql([1, 4]);
});
it('gets the top right', function() {
var corner = ol.extent.Corner.TOP_RIGHT;
expect(ol.extent.getCorner(extent, corner)).to.eql([3, 4]);
});
});
describe('getForViewAndSize', function() {
it('works for a unit square', function() {
@@ -538,5 +563,6 @@ describe('ol.extent', function() {
goog.require('goog.vec.Mat4');
goog.require('ol.extent');
goog.require('ol.extent.Corner');
goog.require('ol.extent.Relationship');
goog.require('ol.proj');