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 describe("smooth-plotter", function() {
   7
   8 var getControlPoints = smoothPlotter._getControlPoints;
   9
  10 beforeEach(function() {
  11 });
  12
  13 afterEach(function() {
  14 });
  15
  16 it('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   assert.deepEqual([11, 1, 11, 1], getControlPoints(lastPt, pt, nextPt, alpha));
  23 });
  24
  25 it('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   assert.deepEqual([10.5, 1, 11.5, 1], getControlPoints(lastPt, pt, nextPt, alpha));
  32 });
  33
  34 it('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   assert.deepEqual([10.5, 0.75, 11.5, 1.25],
  41                getControlPoints(lastPt, pt, nextPt, alpha, true));
  42
  43   assert.deepEqual([10.5, 1, 11.5, 1],
  44                getControlPoints(lastPt, pt, nextPt, alpha, false));
  45 });
  46
  47 });