auto_tests/tests/smooth_plotter.js

   1 /**
   2  * @fileoverview Tests for the smooth (bezier curve) plotter.
   3  *
   4  * @author danvdk@gmail.com (Dan Vanderkam)
   5  */
   6 var smoothPlotterTestCase = TestCase("smooth-plotter");
   7
   8 var getControlPoints = smoothPlotter._getControlPoints;
   9
  10 smoothPlotterTestCase.prototype.setUp = function() {
  11 };
  12
  13 smoothPlotterTestCase.prototype.tearDown = function() {
  14 };
  15
  16 smoothPlotterTestCase.prototype.testNoSmoothing = function() {
  17   var lastPt = {x: 10, y: 0},
  18       pt = {x: 11, y: 1},
  19       nextPt = {x: 12, y: 0},
  20       alpha = 0;
  21
  22   assertEquals([11, 1, 11, 1], getControlPoints(lastPt, pt, nextPt, alpha));
  23 };
  24
  25 smoothPlotterTestCase.prototype.testHalfSmoothing = function() {
  26   var lastPt = {x: 10, y: 0},
  27       pt = {x: 11, y: 1},
  28       nextPt = {x: 12, y: 0},
  29       alpha = 0.5;
  30
  31   assertEquals([10.5, 1, 11.5, 1], getControlPoints(lastPt, pt, nextPt, alpha));
  32 }
  33
  34 smoothPlotterTestCase.prototype.testExtrema = function() {
  35   var lastPt = {x: 10, y: 0},
  36       pt = {x: 11, y: 1},
  37       nextPt = {x: 12, y: 1},
  38       alpha = 0.5;
  39
  40   assertEquals([10.5, 0.75, 11.5, 1.25],
  41                getControlPoints(lastPt, pt, nextPt, alpha, true));
  42
  43   assertEquals([10.5, 1, 11.5, 1],
  44                getControlPoints(lastPt, pt, nextPt, alpha, false));
  45 }