Add some power to the canvas assertions. Also, the canvas assertions weren't actually...

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

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


/** 
 * @fileoverview Test valueRange and dateWindow changes.
 *
 * @author konigsberg@google.com (Robert Konigsberg)
 */
var ZERO_TO_FIFTY = [[ 10, 0 ] , [ 20, 50 ]];
var ZERO_TO_FIFTY_STEPS = function() {
  var a = [];
  var x = 10;
  var y = 0;
  var step = 0;
  for (step = 0; step <= 50; step++) {
    a.push([x + (step * .2), y + step]);
  }
  return a;
} ();

var RangeTestCase = TestCase("range-tests");

RangeTestCase.prototype.setUp = function() {
  document.body.innerHTML = "<div id='graph'></div>";
};

RangeTestCase.prototype.createGraph = function(opts) {
  var graph = document.getElementById("graph");
  var g = new Dygraph(graph, ZERO_TO_FIFTY_STEPS, opts);

  assertEquals([10, 20], g.xAxisRange());
  assertEquals([0, 55], g.yAxisRange(0));

  return g;
};

/**
 * Test that changes to valueRange and dateWindow are reflected
 * appropriately.
 */
RangeTestCase.prototype.testRangeSetOperations = function() {
  var g = this.createGraph({valueRange : [ 0, 55 ]});

  g.updateOptions({ dateWindow : [ 12, 18 ] });
  assertEquals([12, 18], g.xAxisRange());
  assertEquals([0, 55], g.yAxisRange(0));

  g.updateOptions({ valueRange : [ 10, 40 ] });
  assertEquals([12, 18], g.xAxisRange());
  assertEquals([10, 40], g.yAxisRange(0));

  g.updateOptions({  });
  assertEquals([12, 18], g.xAxisRange());
  assertEquals([10, 40], g.yAxisRange(0));
  
  g.updateOptions({valueRange : null, axes: {y:{valueRange : [15, 20]}}});
  assertEquals([12, 18], g.xAxisRange());
  assertEquals([15, 20], g.yAxisRange(0));

  g.updateOptions({ dateWindow : null, valueRange : null, axes: null });
  assertEquals([10, 20], g.xAxisRange());
  assertEquals([0, 55], g.yAxisRange(0));
};

/**
 * Verify that when zoomed in by mouse operations, an empty call to
 * updateOptions doesn't change the displayed ranges.
 */
RangeTestCase.prototype.zoom = function(g, xRange, yRange) {
  var originalXRange = g.xAxisRange();
  var originalYRange = g.yAxisRange(0);

  DygraphOps.dispatchMouseDown(g, xRange[0], yRange[0]);
  DygraphOps.dispatchMouseMove(g, xRange[1], yRange[0]); // this is really necessary.
  DygraphOps.dispatchMouseUp(g, xRange[1], yRange[0]);

  assertEqualsDelta(xRange, g.xAxisRange(), 0.2);
  // assertEqualsDelta(originalYRange, g.yAxisRange(0), 0.2); // Not true, it's something in the middle.

  var midX = (xRange[1] - xRange[0]) / 2;
  DygraphOps.dispatchMouseDown(g, midX, yRange[0]);
  DygraphOps.dispatchMouseMove(g, midX, yRange[1]); // this is really necessary.
  DygraphOps.dispatchMouseUp(g, midX, yRange[1]);

  assertEqualsDelta(xRange, g.xAxisRange(), 0.2);
  assertEqualsDelta(yRange, g.yAxisRange(0), 0.2);
}


/**
 * Verify that when zoomed in by mouse operations, an empty call to
 * updateOptions doesn't change the displayed ranges.
 */
RangeTestCase.prototype.testEmptyUpdateOptions_doesntUnzoom = function() {
  var g = this.createGraph();
  this.zoom(g, [ 11, 18 ], [ 35, 40 ]);

  assertEqualsDelta([11, 18], g.xAxisRange(), 0.1);
  assertEqualsDelta([35, 40], g.yAxisRange(0), 0.2);

  g.updateOptions({});

  assertEqualsDelta([11, 18], g.xAxisRange(), 0.1);
  assertEqualsDelta([35, 40], g.yAxisRange(0), 0.2);
}

/**
 * Verify that when zoomed in by mouse operations, a call to
 * updateOptions({ dateWindow : null, valueRange : null }) fully
 * unzooms.
 */
RangeTestCase.prototype.testRestoreOriginalRanges_viaUpdateOptions = function() {
  var g = this.createGraph();
  this.zoom(g, [ 11, 18 ], [ 35, 40 ]);

  g.updateOptions({ dateWindow : null, valueRange : null });

  assertEquals([0, 55], g.yAxisRange(0));
  assertEquals([10, 20], g.xAxisRange());
}