Merge pull request #692 from ahocevar/pnpoly

Point-in-polygon improvements. r=@bartvde
2013-05-08 05:11:16 -07:00
parent 14e073fb5a 019fc86ac5
commit 96c3a86314
5 changed files with 109 additions and 39 deletions
@@ -40,6 +40,71 @@ describe('ol.geom.LinearRing', function() {

  });

+  describe('#containsCoordinate()', function() {
+
+    it('knows when a point coordinate is inside a ring', function() {
+      /**
+       *  The ring:
+       *                      edge 3
+       *          (5, 10)  __________ (15, 10)
+       *                 /         /
+       *        edge 4 /         / edge 2
+       *             /         /
+       *    (0, 0) /_________/ (10, 0)
+       *             edge 1
+       */
+      var ring = new ol.geom.LinearRing(
+          [[0, 0], [10, 0], [15, 10], [5, 10]]);
+
+      // contains: 1 (touches - not implemented), true (within), false (outside)
+      var cases = [{
+        point: [5, 5], contains: true
+      }, {
+        point: [20, 20], contains: false
+      }, {
+        point: [15, 15], contains: false
+      }/*, {
+        point: [0, 0], contains: 1 // lower left corner
+      }, {
+        point: [10, 0], contains: 1 // lower right corner
+      }, {
+        point: [15, 10], contains: 1 // upper right corner
+      }, {
+        point: [5, 10], contains: 1 // upper left corner
+      }, {
+        point: [5, 0], contains: 1 // on edge 1
+      }*/, {
+        point: [5, -0.1], contains: false // below edge 1
+      }, {
+        point: [5, 0.1], contains: true // above edge 1
+      }/*, {
+        point: [12.5, 5], contains: 1 // on edge 2
+      }*/, {
+        point: [12.4, 5], contains: true // left of edge 2
+      }, {
+        point: [12.6, 5], contains: false // right of edge 2
+      }/*, {
+        point: [10, 10], contains: 1 // on edge 3
+      }*/, {
+        point: [10, 9.9], contains: true // below edge 3
+      }, {
+        point: [10, 10.1], contains: false // above edge 3
+      }/*, {
+        point: [2.5, 5], contains: 1 // on edge 4
+      }*/, {
+        point: [2.4, 5], contains: false // left of edge 4
+      }, {
+        point: [2.6, 5], contains: true // right of edge 4
+      }];
+
+      var c;
+      for (var i = 0, ii = cases.length; i < ii; ++i) {
+        c = cases[i];
+        expect(ring.containsCoordinate(c.point)).to.be(c.contains);
+      }
+    });
+  });
+
 });

 goog.require('ol.geom.LinearRing');