simple_drawing.js

   1 // Copyright (c) 2011 Google, Inc.
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  12 //
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  14 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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  19 // THE SOFTWARE.
  20
  21 /**
  22  * @fileoverview Test cases for drawing simple lines.
  23  *
  24  * @author konigsberg@google.com (Robert Konigsberg)
  25  */
  26
  27 import Dygraph from '../../src/dygraph';
  28 import * as utils from '../../src/dygraph-utils';
  29
  30 import CanvasAssertions from './CanvasAssertions';
  31 import Proxy from './Proxy';
  32 import PixelSampler from './PixelSampler';
  33
  34 describe("simple-drawing", function() {
  35
  36 cleanupAfterEach();
  37 useProxyCanvas(utils, Proxy);
  38
  39 var ZERO_TO_FIFTY = 'X,Y\n10,0\n20,50';
  40
  41 it('testDrawSimpleRangePlusOne', function() {
  42   var opts = {
  43     axes: {
  44       x: {
  45         drawGrid: false,
  46         drawAxis: false
  47       },
  48       y: {
  49         drawGrid: false,
  50         drawAxis: false
  51       }
  52     },
  53     valueRange: [0,51]
  54   };
  55
  56   var graph = document.getElementById("graph");
  57   var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  58   var htx = g.hidden_ctx_;
  59
  60   CanvasAssertions.assertLineDrawn(htx, [0,320], [475,6.2745], {
  61     strokeStyle: "#008080",
  62     lineWidth: 1
  63   });
  64   g.destroy(); // to balance context saves and destroys.
  65   CanvasAssertions.assertBalancedSaveRestore(htx);
  66 });
  67
  68 // See http://code.google.com/p/dygraphs/issues/detail?id=185
  69 it('testDrawSimpleRangeZeroToFifty', function() {
  70   var opts = {
  71     axes : {
  72       x : {
  73         drawGrid: false,
  74         drawAxis: false,
  75       },
  76       y : {
  77         drawGrid: false,
  78         drawAxis: false,
  79       }
  80     },
  81     valueRange: [0,50] }
  82
  83   var graph = document.getElementById("graph");
  84   var g = new Dygraph(graph, ZERO_TO_FIFTY, opts);
  85   var htx = g.hidden_ctx_;
  86
  87   var lines = CanvasAssertions.getLinesDrawn(htx, {
  88     strokeStyle: "#008080",
  89     lineWidth: 1
  90   });
  91   assert.equal(1, lines.length);
  92   g.destroy(); // to balance context saves and destroys.
  93   CanvasAssertions.assertBalancedSaveRestore(htx);
  94 });
  95
  96 it('testDrawWithAxis', function() {
  97   var graph = document.getElementById("graph");
  98   var g = new Dygraph(graph, ZERO_TO_FIFTY);
  99
 100   var htx = g.hidden_ctx_;
 101   g.destroy(); // to balance context saves and destroys.
 102   CanvasAssertions.assertBalancedSaveRestore(htx);
 103 });
 104
 105 /**
 106  * Tests that it is drawing dashes, and it remember the dash history between
 107  * points.
 108  */
 109 it('testDrawSimpleDash', function() {
 110   var opts = {
 111     axes: {
 112       x: {
 113         drawGrid: false,
 114         drawAxis: false
 115       },
 116       y: {
 117         drawGrid: false,
 118         drawAxis: false
 119       }
 120     },
 121     series: {
 122       'Y1': {strokePattern: [25, 7, 7, 7]},
 123     },
 124     colors: ['#ff0000'],
 125     labels: ['X', 'Y']
 126   };
 127
 128   var graph = document.getElementById("graph");
 129   // Set the dims so we pass if default changes.
 130   graph.style.width='480px';
 131   graph.style.height='320px';
 132   var g = new Dygraph(graph, [[1, 4], [2, 5], [3, 3], [4, 7], [5, 9]], opts);
 133   var htx = g.hidden_ctx_;
 134
 135   // TODO(danvk): figure out a good way to restore this test.
 136   // assert.equal(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 137   g.destroy(); // to balance context saves and destroys.
 138   CanvasAssertions.assertBalancedSaveRestore(htx);
 139 });
 140
 141 /**
 142  * Tests that thick lines are drawn continuously.
 143  * Regression test for http://code.google.com/p/dygraphs/issues/detail?id=328
 144  */
 145 it('testDrawThickLine', function() {
 146   var opts = {
 147     axes: {
 148       x: {
 149         drawGrid: false,
 150         drawAxis: false
 151       },
 152       y: {
 153         drawGrid: false,
 154         drawAxis: false
 155       }
 156     },
 157     strokeWidth: 15,
 158     colors: ['#ff0000'],
 159     labels: ['X', 'Y']
 160   };
 161
 162   var graph = document.getElementById("graph");
 163   // Set the dims so we pass if default changes.
 164   graph.style.width='480px';
 165   graph.style.height='320px';
 166   var g = new Dygraph(graph, [[1, 2], [2, 5], [3, 2], [4, 7], [5, 0]], opts);
 167   var htx = g.hidden_ctx_;
 168
 169   // There's a big gap in the line at (2, 5)
 170   // If the bug is fixed, then there should be some red going up from here.
 171   var xy = g.toDomCoords(2, 5);
 172   var x = Math.round(xy[0]), y = Math.round(xy[1]);
 173
 174   var sampler = new PixelSampler(g);
 175   assert.deepEqual([255,0,0,255], sampler.colorAtPixel(x, y));
 176   assert.deepEqual([255,0,0,255], sampler.colorAtPixel(x, y - 1));
 177   assert.deepEqual([255,0,0,255], sampler.colorAtPixel(x, y - 2));
 178
 179   // TODO(danvk): figure out a good way to restore this test.
 180   // assert.equal(29, CanvasAssertions.numLinesDrawn(htx, "#ff0000"));
 181   g.destroy(); // to balance context saves and destroys.
 182   CanvasAssertions.assertBalancedSaveRestore(htx);
 183 });
 184
 185 });