Support stroke patterns (i.e. dashed/dotted lines).

[dygraphs.git] / auto_tests / tests / simple_drawing.js

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/** 
 * @fileoverview Test cases for drawing simple lines.
 *
 * @author konigsberg@google.com (Robert Konigsberg)
 */
var ZERO_TO_FIFTY = [[ 10, 0 ] , [ 20, 50 ]];

var SimpleDrawingTestCase = TestCase("simple-drawing");

var _origFunc = Dygraph.getContext;
SimpleDrawingTestCase.prototype.setUp = function() {
  document.body.innerHTML = "<div id='graph'></div>";
  Dygraph.getContext = function(canvas) {
    return new Proxy(_origFunc(canvas));
  }
};

SimpleDrawingTestCase.prototype.tearDown = function() {
  Dygraph.getContext = _origFunc;
};

SimpleDrawingTestCase.prototype.testDrawSimpleRangePlusOne = function() {
  var opts = {
    drawXGrid: false,
    drawYGrid: false,
    drawXAxis: false,
    drawYAxis: false,
    valueRange: [0,51] }

  var graph = document.getElementById("graph");
  var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  htx = g.hidden_ctx_;

  CanvasAssertions.assertLineDrawn(htx, [0,320], [475,6.2745], {
    strokeStyle: "#008080",
    lineWidth: 1
  });
}

/**
 * Tests that it is drawing dashes, and it remember the dash history between
 * points.
 */
SimpleDrawingTestCase.prototype.testDrawSimpleDash = function() {
  var opts = {
      drawXGrid: false,
      drawYGrid: false,
      drawXAxis: false,
      drawYAxis: false,
      'Y1': {strokePattern: [25, 7, 7, 7]},
      colors: ['#ff0000']
  };

  var graph = document.getElementById("graph");
  // Set the dims so we pass if default changes.
  graph.style.width='480px';
  graph.style.height='320px';
  var g = new Dygraph(graph, [[1, 4], [2, 5], [3, 3], [4, 7], [5, 9]], opts);
  htx = g.hidden_ctx_;

  assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
};