smooth_plotter.js

   1 /**
   2  * @fileoverview Tests for the smooth (bezier curve) plotter.
   3  *
   4  * @author danvdk@gmail.com (Dan Vanderkam)
   5  */
   6
   7 import Dygraph from '../../src/dygraph';
   8 import '../../src/extras/smooth-plotter';  // defines Dygraph.smoothPlotter
   9
  10 describe("smooth-plotter", function() {
  11
  12 var smoothPlotter = Dygraph.smoothPlotter;
  13 var getControlPoints = smoothPlotter._getControlPoints;
  14
  15 beforeEach(function() {
  16 });
  17
  18 afterEach(function() {
  19 });
  20
  21 it('testNoSmoothing', function() {
  22   var lastPt = {x: 10, y: 0},
  23       pt = {x: 11, y: 1},
  24       nextPt = {x: 12, y: 0},
  25       alpha = 0;
  26
  27   assert.deepEqual([11, 1, 11, 1], getControlPoints(lastPt, pt, nextPt, alpha));
  28 });
  29
  30 it('testHalfSmoothing', function() {
  31   var lastPt = {x: 10, y: 0},
  32       pt = {x: 11, y: 1},
  33       nextPt = {x: 12, y: 0},
  34       alpha = 0.5;
  35
  36   assert.deepEqual([10.5, 1, 11.5, 1], getControlPoints(lastPt, pt, nextPt, alpha));
  37 });
  38
  39 it('testExtrema', function() {
  40   var lastPt = {x: 10, y: 0},
  41       pt = {x: 11, y: 1},
  42       nextPt = {x: 12, y: 1},
  43       alpha = 0.5;
  44
  45   assert.deepEqual([10.5, 0.75, 11.5, 1.25],
  46                getControlPoints(lastPt, pt, nextPt, alpha, true));
  47
  48   assert.deepEqual([10.5, 1, 11.5, 1],
  49                getControlPoints(lastPt, pt, nextPt, alpha, false));
  50 });
  51
  52 });