Added test for ol.render.canvas.ReplayGroup#getCircleArray_

test/spec/ol/render/canvas/replaygroup.test.js

@@ -0,0 +1,33 @@
+goog.provide('ol.test.render.canvas.ReplayGroup');
+
+goog.require('ol.render.canvas.ReplayGroup');
+
+
+describe('ol.render.canvas.ReplayGroup', function() {
+
+  describe('#getCircleArray_', function() {
+    it('creates an array with a pixelated circle marked with true', function() {
+      var radius = 10;
+      var minRadiusSq = Math.pow(radius - Math.SQRT2, 2);
+      var maxRadiusSq = Math.pow(radius + Math.SQRT2, 2);
+      var circleArray = ol.render.canvas.ReplayGroup.getCircleArray_(radius);
+      var size = radius * 2 + 1;
+      expect(circleArray.length).to.be(size);
+
+      for (var i = 0; i < size; i++) {
+        expect(circleArray[i].length).to.be(size);
+        for (var j = 0; j < size; j++) {
+          var dx = Math.abs(radius - i);
+          var dy = Math.abs(radius - j);
+          var distanceSq = Math.pow(dx, 2) + Math.pow(dy, 2);
+          if (circleArray[i][j] === true) {
+            expect(distanceSq).to.be.within(0, maxRadiusSq);
+          } else {
+            expect(distanceSq).to.be.within(minRadiusSq, Infinity);
+          }
+        }
+      }
+    });
+  });
+
+});