Merge pull request #304 from danvk/merge-hairline

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

// Copyright (c) 2011 Google, Inc.
//
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// THE SOFTWARE.

/** 
 * @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");

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

SimpleDrawingTestCase.prototype.tearDown = function() {
  Dygraph.getContext = SimpleDrawingTestCase._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);
  var htx = g.hidden_ctx_;

  CanvasAssertions.assertLineDrawn(htx, [0,320], [475,6.2745], {
    strokeStyle: "#008080",
    lineWidth: 1
  });
  g.destroy(); // to balance context saves and destroys.
  CanvasAssertions.assertBalancedSaveRestore(htx);
};

// See http://code.google.com/p/dygraphs/issues/detail?id=185
SimpleDrawingTestCase.prototype.testDrawSimpleRangeZeroToFifty = function() {
  var opts = {
    drawXGrid: false,
    drawYGrid: false,
    drawXAxis: false,
    drawYAxis: false,
    valueRange: [0,50] }

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

  var lines = CanvasAssertions.getLinesDrawn(htx, {
    strokeStyle: "#008080",
    lineWidth: 1
  });
  assertEquals(1, lines.length);
  g.destroy(); // to balance context saves and destroys.
  CanvasAssertions.assertBalancedSaveRestore(htx);
};

SimpleDrawingTestCase.prototype.testDrawWithAxis = function() {
  var graph = document.getElementById("graph");
  var g = new Dygraph(graph, ZERO_TO_FIFTY);

  var htx = g.hidden_ctx_;
  g.destroy(); // to balance context saves and destroys.
  CanvasAssertions.assertBalancedSaveRestore(htx);
};

/**
 * 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_;

  // TODO(danvk): figure out a good way to restore this test.
  // assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
  g.destroy(); // to balance context saves and destroys.
  CanvasAssertions.assertBalancedSaveRestore(htx);
};

/**
 * Tests that thick lines are drawn continuously.
 * Regression test for http://code.google.com/p/dygraphs/issues/detail?id=328
 */
SimpleDrawingTestCase.prototype.testDrawThickLine = function() {
  var opts = {
    drawXGrid: false,
    drawYGrid: false,
    drawXAxis: false,
    drawYAxis: false,
    strokeWidth: 15,
    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, 2], [2, 5], [3, 2], [4, 7], [5, 0]], opts);
  htx = g.hidden_ctx_;

  // There's a big gap in the line at (2, 5)
  // If the bug is fixed, then there should be some red going up from here.
  var xy = g.toDomCoords(2, 5);
  var x = Math.round(xy[0]), y = Math.round(xy[1]);

  var sampler = new PixelSampler(g);
  assertEquals([255,0,0,255], sampler.colorAtPixel(x, y));
  assertEquals([255,0,0,255], sampler.colorAtPixel(x, y - 1));
  assertEquals([255,0,0,255], sampler.colorAtPixel(x, y - 2));

  // TODO(danvk): figure out a good way to restore this test.
  // assertEquals(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
  g.destroy(); // to balance context saves and destroys.
  CanvasAssertions.assertBalancedSaveRestore(htx);
};