openlayers/test/spec/ol/renderer/webgl/imagelayer.test.js

Build tools and sources for developing OpenLayers based mapping applications

goog.provide('ol.test.renderer.webgl.ImageLayer');

goog.require('ol.transform');
goog.require('ol.Map');
goog.require('ol.proj.common');
goog.require('ol.layer.Image');
goog.require('ol.source.Image');
goog.require('ol.renderer.webgl.ImageLayer');


describe('ol.renderer.webgl.ImageLayer', function() {
  describe('updateProjectionMatrix_', function() {
    var map;
    var renderer;
    var canvasWidth;
    var canvasHeight;
    var pixelRatio;
    var viewResolution;
    var viewRotation;
    var viewCenter;
    var imageExtent;

    beforeEach(function() {
      ol.proj.common.add();

      map = new ol.Map({
        target: document.createElement('div')
      });
      var layer = new ol.layer.Image({
        source: new ol.source.Image({
          extent: [0, 0, 1, 1]
        })
      });
      renderer = new ol.renderer.webgl.ImageLayer(map.renderer_, layer);

      // input params
      canvasWidth = 512;
      canvasHeight = 256;
      pixelRatio = 2;
      viewResolution = 10;
      viewRotation = 0;
      viewCenter = [7680, 3840];
      // view extent is 512O, 2560, 10240, 5120

      // image size is 1024, 768
      // image resolution is 10
      imageExtent = [0, 0, 10240, 7680];
    });

    afterEach(function() {
      map.dispose();
    });

    it('produces a correct matrix', function() {

      renderer.updateProjectionMatrix_(canvasWidth, canvasHeight,
          pixelRatio, viewCenter, viewResolution, viewRotation, imageExtent);
      var matrix = renderer.getProjectionMatrix();

      var output = ol.transform.apply(matrix, [-1, -1]);
      expect(output[0]).to.eql(-6);
      expect(output[1]).to.eql(-6);

      output = ol.transform.apply(matrix, [1, -1]);
      expect(output[0]).to.eql(2);
      expect(output[1]).to.eql(-6);

      output = ol.transform.apply(matrix, [-1, 1]);
      expect(output[0]).to.eql(-6);
      expect(output[1]).to.eql(6);

      output = ol.transform.apply(matrix, [1, 1]);
      expect(output[0]).to.eql(2);
      expect(output[1]).to.eql(6);

      output = ol.transform.apply(matrix, [0, 0]);
      expect(output[0]).to.eql(-2);
      expect(output[1]).to.eql(0);
    });
  });
});