auto_tests/tests/resize.js

   1 /**
   2  * @fileoverview Test cases for resizing.
   3  *
   4  * @author konigsberg@google.com (Robert Konigsberg)
   5  */
   6 describe("resize", function() {
   7
   8 var data =
   9       "X,Y\n" +
  10       "1,100\n" +
  11       "2,200\n" +
  12       "3,300\n" +
  13       "4,400\n" +
  14       "5,300\n" +
  15       "6,100\n";
  16
  17 beforeEach(function() {
  18   document.body.innerHTML = "<div id='graph'></div>";
  19 });
  20
  21 afterEach(function() {
  22 });
  23
  24 it('testResizeMaintainsMouseOperations', function() {
  25   document.body.innerHTML =
  26       '<div id="graph" style="width: 640px; height: 480px;"></div>' +
  27       '</div>';
  28   var graph = document.getElementById("graph");
  29
  30   var callbackCount = 0;
  31   var callback = function() {
  32     callbackCount++;
  33   }
  34
  35   // Strum the mouse along the y-coordinate y, from 0 to x2. These are DOM values.
  36   var strum = function(g, y, x2) {
  37     DygraphOps.dispatchMouseDown_Point(g, 0, y);
  38     for (var x = 0; x < x2; x++) {
  39       DygraphOps.dispatchMouseMove_Point(g, x, y);
  40     }
  41     DygraphOps.dispatchMouseUp_Point(g, x2 - 1, y);
  42   }
  43
  44   var g = new Dygraph(graph, data, {highlightCallback: callback});
  45
  46   strum(g, 300, 640);
  47   assert.equal(6, callbackCount);
  48
  49   document.getElementById("graph").style.width = "500px";
  50   g.resize();
  51
  52   callbackCount = 0;
  53   strum(g, 300, 500);
  54   assert.equal(6, callbackCount);
  55 });
  56
  57 /**
  58  * Tests that a graph created in a not-displayed div works as expected
  59  * if the graph options include height and width. Resize not needed.
  60  */
  61 it('testHiddenDivWithSizedGraph', function() {
  62   var div = document.getElementById("graph");
  63
  64   div.style.display = 'none';
  65   var g = new Dygraph(div, data, {width: 400, height: 300});
  66   div.style.display = '';
  67
  68   var area = g.getArea();
  69   assert.isTrue(area.w > 0);
  70   assert.isTrue(area.h > 0);
  71 });
  72
  73 /**
  74  * Tests that a graph created in a not-displayed div with
  75  * CSS-specified size but no graph height or width options works as
  76  * expected. The user needs to call resize() on it after displaying
  77  * it.
  78  */
  79 it('testHiddenDivWithResize', function() {
  80   var div = document.getElementById("graph");
  81
  82   div.style.display = 'none';
  83   div.style.width = '400px';
  84   div.style.height = '300px';
  85
  86   // Setting strokeWidth 3 removes any ambiguitiy from the pixel sampling
  87   // request, below.
  88   var g = new Dygraph(div, data, {strokeWidth: 3});
  89   div.style.display = '';
  90
  91   g.resize();
  92   var area = g.getArea();
  93   assert.isTrue(area.w > 0);
  94   assert.isTrue(area.h > 0);
  95
  96   // Regression test: check that graph remains visible after no-op resize.
  97   g.resize();
  98   var x = Math.floor(g.toDomXCoord(2));
  99   var y = Math.floor(g.toDomYCoord(200));
 100   assert.deepEqual([0, 128, 128, 255], Util.samplePixel(g.hidden_, x, y),
 101                    "Unexpected grid color found at pixel: x: " + x + " y: " + y);
 102 });
 103
 104 });