update_while_panning.js

   1 /**
   2  * @fileoverview Regression test for a bug involving data update while panning.
   3  *
   4  * See http://stackoverflow.com/questions/9528173
   5  *
   6  * @author dan@dygraphs.com (Dan Vanderkam)
   7  */
   8
   9 import Dygraph from '../../src/dygraph';
  10 import DygraphOps from './DygraphOps';
  11
  12 describe("update-while-panning", function() {
  13
  14 cleanupAfterEach();
  15
  16 // This tests the following sequence:
  17 // 1. Begin dragging a chart (x-panning)
  18 // 2. Do a data update (updateOptions({file: ...}))
  19 // 3. Verify that the y-axis is still well-defined.
  20 it('testUpdateWhilePanning', function() {
  21   var sinewave = function(start, limit, step) {
  22     var data = [];
  23     for (var x = start; x < limit; x += step) {
  24       data.push([x, Math.sin(x)]);
  25     }
  26     return data;
  27   };
  28
  29   var opts = {
  30     width: 480,
  31     height: 320,
  32     valueRange: [-2, 2],
  33     labels: ['X', 'Y']
  34   };
  35
  36   var graph = document.getElementById("graph");
  37
  38   var g = new Dygraph(graph, sinewave(0, 6, 0.1), opts);
  39   assert.deepEqual([-2, 2], g.yAxisRange());
  40
  41   // Start a pan, but don't finish it yet.
  42   DygraphOps.dispatchMouseDown_Point(g, 200, 100, {shiftKey: true});
  43   DygraphOps.dispatchMouseMove_Point(g, 100, 100, {shiftKey: true});
  44   assert.deepEqual([-2, 2], g.yAxisRange());
  45
  46   // Now do a data update. y-axis should remain the same.
  47   g.updateOptions({file: sinewave(0, 7, 0.1)});
  48   assert.deepEqual([-2, 2], g.yAxisRange());
  49
  50   // Keep the pan going.
  51   DygraphOps.dispatchMouseMove_Point(g, 50, 100, {shiftKey: true});
  52   assert.deepEqual([-2, 2], g.yAxisRange());
  53
  54   // Now finish the pan.
  55   DygraphOps.dispatchMouseUp_Point(g, 100, 100, {shiftKey: true});
  56   assert.deepEqual([-2, 2], g.yAxisRange());
  57 });
  58
  59
  60 });