Allow rendering geometries to an arbitrary canvas

test/spec/ol/render.test.js

@@ -0,0 +1,37 @@
+goog.provide('ol.test.render');
+
+describe('ol.render', function() {
+
+  describe('toContext', function() {
+
+    it('creates an ol.render.canvas.Immediate and sets defaults', function() {
+      var canvas = document.createElement('canvas');
+      var render = ol.render.toContext(canvas.getContext('2d'));
+      expect(render).to.be.a(ol.render.canvas.Immediate);
+      expect(render.pixelRatio_).to.be(ol.has.DEVICE_PIXEL_RATIO);
+    });
+
+    it('sets size and pixel ratio from options', function() {
+      var canvas = document.createElement('canvas');
+      var pixelRatio = 1.5;
+      var size = [100, 50];
+      var render = ol.render.toContext(canvas.getContext('2d'),
+          {pixelRatio: pixelRatio, size: size});
+      expect(render.pixelRatio_).to.be(pixelRatio);
+      expect(render.extent_).to.eql(
+          [0, 0, size[0] * pixelRatio, size[1] * pixelRatio]);
+      expect(canvas.style.width).to.be(size[0] + 'px');
+      expect(canvas.style.height).to.be(size[1] + 'px');
+      var transform = ol.vec.Mat4.makeTransform2D(goog.vec.Mat4.createNumber(),
+          0, 0, pixelRatio, pixelRatio, 0, 0, 0);
+      expect(ol.vec.Mat4.equals2D(render.transform_, transform)).to.be.ok();
+    });
+  });
+
+});
+
+
+goog.require('goog.vec.Mat4');
+goog.require('ol.render');
+goog.require('ol.render.canvas.Immediate');
+goog.require('ol.vec.Mat4');