| 1 | /** |
| 2 | * @fileoverview Tests using the "stackedGraph" option. |
| 3 | * |
| 4 | * @author dan@dygraphs.com (Dan Vanderkam) |
| 5 | */ |
| 6 | var stackedTestCase = TestCase("stacked"); |
| 7 | |
| 8 | stackedTestCase.prototype.setUp = function() { |
| 9 | document.body.innerHTML = "<div id='graph'></div>"; |
| 10 | }; |
| 11 | |
| 12 | stackedTestCase.prototype.tearDown = function() { |
| 13 | }; |
| 14 | |
| 15 | stackedTestCase.prototype.testCorrectColors = function() { |
| 16 | var opts = { |
| 17 | width: 400, |
| 18 | height: 300, |
| 19 | stackedGraph: true, |
| 20 | drawXGrid: false, |
| 21 | drawYGrid: false, |
| 22 | drawXAxis: false, |
| 23 | drawYAxis: false, |
| 24 | valueRange: [0, 3], |
| 25 | colors: ['#00ff00', '#0000ff'], |
| 26 | fillAlpha: 0.15 |
| 27 | }; |
| 28 | var data = "X,Y1,Y2\n" + |
| 29 | "0,1,1\n" + |
| 30 | "1,1,1\n" + |
| 31 | "2,1,1\n" + |
| 32 | "3,1,1\n" |
| 33 | ; |
| 34 | |
| 35 | var graph = document.getElementById("graph"); |
| 36 | var g = new Dygraph(graph, data, opts); |
| 37 | |
| 38 | // y pixels 299-201 = y2 = transparent blue |
| 39 | // y pixel 200 = y2 line (blue) |
| 40 | // y pixels 199-101 = y1 = transparent green |
| 41 | // y pixel 100 = y1 line (green) |
| 42 | // y pixels 0-99 = nothing (white) |
| 43 | |
| 44 | // TODO(danvk): factor this and getPixel() into a utility usable by all tests. |
| 45 | var ctx = g.hidden_ctx_; |
| 46 | var imageData = ctx.getImageData(0, 0, 400, 300); |
| 47 | |
| 48 | assertEquals(400, imageData.width); |
| 49 | assertEquals(300, imageData.height); |
| 50 | |
| 51 | // returns an (r, g, b, alpha) tuple for the pixel. |
| 52 | // values are in [0, 255]. |
| 53 | var getPixel = function(imageData, x, y) { |
| 54 | var i = 4 * (x + imageData.width * y); |
| 55 | var d = imageData.data; |
| 56 | return [d[i], d[i+1], d[i+2], d[i+3]]; |
| 57 | }; |
| 58 | |
| 59 | // 38 = round(0.15 * 255) |
| 60 | assertEquals([0, 0, 255, 38], getPixel(imageData, 200, 250)); |
| 61 | assertEquals([0, 255, 0, 38], getPixel(imageData, 200, 150)); |
| 62 | }; |