Add ol.extent.touches

src/ol/extent.js

@@ -337,6 +337,19 @@ ol.extent.toString = function(extent) {
 };
 
 
+/**
+ * @param {ol.Extent} extent1 Extent 1.
+ * @param {ol.Extent} extent2 Extent 2.
+ * @return {boolean} Touches.
+ */
+ol.extent.touches = function(extent1, extent2) {
+  var intersects = ol.extent.intersects(extent1, extent2);
+  return intersects &&
+      (extent1[0] == extent2[2] || extent1[2] == extent2[0] ||
+       extent1[1] == extent2[3] || extent1[3] == extent2[1]);
+};
+
+
 /**
  * @param {ol.Extent} extent Extent.
  * @param {ol.TransformFunction} transformFn Transform function.

test/spec/ol/extent.test.js

@@ -122,7 +122,7 @@ describe('ol.extent', function() {
     });
   });
 
-  describe('intersect', function() {
+  describe('intersects', function() {
 
     it('returns the expected value', function() {
       var intersects = ol.extent.intersects;
@@ -157,6 +157,23 @@ describe('ol.extent', function() {
     });
   });
 
+  describe('touches', function() {
+
+    it('returns the expected value', function() {
+      var touches = ol.extent.touches;
+      var extent = [50, 50, 100, 100];
+      expect(touches(extent, [20, 20, 80, 80])).to.be(false);
+      expect(touches(extent, [20, 20, 50, 80])).to.be(true);
+      expect(touches(extent, [20, 20, 50, 40])).to.be(false);
+      expect(touches(extent, [100, 20, 140, 80])).to.be(true);
+      expect(touches(extent, [100, 20, 140, 40])).to.be(false);
+      expect(touches(extent, [20, 20, 80, 50])).to.be(true);
+      expect(touches(extent, [20, 20, 40, 50])).to.be(false);
+      expect(touches(extent, [20, 100, 80, 140])).to.be(true);
+      expect(touches(extent, [20, 100, 40, 140])).to.be(false);
+    });
+  });
+
   describe('normalize', function() {
     it('returns the expected coordinate', function() {
       var extent = [0, 1, 2, 3];