Andreas Hocevar
127 lines
4.7 KiB
JavaScript
127 lines
4.7 KiB
JavaScript
// Copyright 2007 The Closure Library Authors. All Rights Reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS-IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
goog.provide('goog.math.BezierTest');
|
|
goog.setTestOnly('goog.math.BezierTest');
|
|
|
|
goog.require('goog.math');
|
|
goog.require('goog.math.Bezier');
|
|
goog.require('goog.math.Coordinate');
|
|
goog.require('goog.testing.jsunit');
|
|
|
|
function testEquals() {
|
|
var input = new goog.math.Bezier(1, 2, 3, 4, 5, 6, 7, 8);
|
|
|
|
assert(input.equals(input));
|
|
}
|
|
|
|
function testClone() {
|
|
var input = new goog.math.Bezier(1, 2, 3, 4, 5, 6, 7, 8);
|
|
|
|
assertNotEquals('Clone returns a new object', input, input.clone());
|
|
assert('Contents of clone match original', input.equals(input.clone()));
|
|
}
|
|
|
|
function testFlip() {
|
|
var input = new goog.math.Bezier(1, 1, 2, 2, 3, 3, 4, 4);
|
|
var compare = new goog.math.Bezier(4, 4, 3, 3, 2, 2, 1, 1);
|
|
|
|
var flipped = input.clone();
|
|
flipped.flip();
|
|
assert('Flipped behaves as expected', compare.equals(flipped));
|
|
|
|
flipped.flip();
|
|
assert('Flipping twice gives original', input.equals(flipped));
|
|
}
|
|
|
|
function testGetPoint() {
|
|
var input = new goog.math.Bezier(0, 1, 1, 2, 2, 3, 3, 4);
|
|
|
|
assert(goog.math.Coordinate.equals(input.getPoint(0),
|
|
new goog.math.Coordinate(0, 1)));
|
|
assert(goog.math.Coordinate.equals(input.getPoint(1),
|
|
new goog.math.Coordinate(3, 4)));
|
|
assert(goog.math.Coordinate.equals(input.getPoint(0.5),
|
|
new goog.math.Coordinate(1.5, 2.5)));
|
|
}
|
|
|
|
function testGetPointX() {
|
|
var input = new goog.math.Bezier(0, 1, 1, 2, 2, 3, 3, 4);
|
|
|
|
assert(goog.math.nearlyEquals(input.getPointX(0), 0));
|
|
assert(goog.math.nearlyEquals(input.getPointX(1), 3));
|
|
assert(goog.math.nearlyEquals(input.getPointX(0.5), 1.5));
|
|
}
|
|
|
|
function testGetPointY() {
|
|
var input = new goog.math.Bezier(0, 1, 1, 2, 2, 3, 3, 4);
|
|
|
|
assert(goog.math.nearlyEquals(input.getPointY(0), 1));
|
|
assert(goog.math.nearlyEquals(input.getPointY(1), 4));
|
|
assert(goog.math.nearlyEquals(input.getPointY(0.5), 2.5));
|
|
}
|
|
|
|
function testSubdivide() {
|
|
var input = new goog.math.Bezier(0, 1, 1, 2, 2, 3, 3, 4);
|
|
|
|
input.subdivide(1 / 3, 2 / 3);
|
|
|
|
assert(goog.math.nearlyEquals(1, input.x0));
|
|
assert(goog.math.nearlyEquals(2, input.y0));
|
|
assert(goog.math.nearlyEquals(2, input.x3));
|
|
assert(goog.math.nearlyEquals(3, input.y3));
|
|
}
|
|
|
|
function testSolvePositionFromXValue() {
|
|
var eps = 1e-6;
|
|
var bezier = new goog.math.Bezier(0, 0, 0.25, 0.1, 0.25, 1, 1, 1);
|
|
var pt = bezier.getPoint(0.5);
|
|
assertRoughlyEquals(0.3125, pt.x, eps);
|
|
assertRoughlyEquals(0.5375, pt.y, eps);
|
|
assertRoughlyEquals(0.321,
|
|
bezier.solvePositionFromXValue(bezier.getPoint(0.321).x), eps);
|
|
}
|
|
|
|
function testSolveYValueFromXValue() {
|
|
var eps = 1e-6;
|
|
// The following example is taken from
|
|
// http://www.netzgesta.de/dev/cubic-bezier-timing-function.html.
|
|
// The timing values shown in that page are 1 - <value> so the
|
|
// bezier curves in this test are constructed with 1 - ctrl points.
|
|
// E.g. ctrl points (0, 0, 0.25, 0.1, 0.25, 1, 1, 1) become
|
|
// (1, 1, 0.75, 0, 0.75, 0.9, 0, 0) here. Since chanding the order of
|
|
// the ctrl points does not affect the shape of the curve, once can also
|
|
// have (0, 0, 0.75, 0.9, 0.75, 0, 1, 1).
|
|
|
|
// netzgesta example.
|
|
var bezier = new goog.math.Bezier(1, 1, 0.75, 0.9, 0.75, 0, 0, 0);
|
|
assertRoughlyEquals(0.024374631, bezier.solveYValueFromXValue(0.2), eps);
|
|
assertRoughlyEquals(0.317459494, bezier.solveYValueFromXValue(0.6), eps);
|
|
assertRoughlyEquals(0.905205002, bezier.solveYValueFromXValue(0.9), eps);
|
|
|
|
// netzgesta example with ctrl points in the reverse order so that 1st and
|
|
// last ctrl points are (0, 0) and (1, 1). Note the result is exactly the
|
|
// same.
|
|
bezier = new goog.math.Bezier(0, 0, 0.75, 0, 0.75, 0.9, 1, 1);
|
|
assertRoughlyEquals(0.024374631, bezier.solveYValueFromXValue(0.2), eps);
|
|
assertRoughlyEquals(0.317459494, bezier.solveYValueFromXValue(0.6), eps);
|
|
assertRoughlyEquals(0.905205002, bezier.solveYValueFromXValue(0.9), eps);
|
|
|
|
// Ease-out css animation timing in webkit.
|
|
bezier = new goog.math.Bezier(0, 0, 0, 0, 0.58, 1, 1, 1);
|
|
assertRoughlyEquals(0.308366667, bezier.solveYValueFromXValue(0.2), eps);
|
|
assertRoughlyEquals(0.785139061, bezier.solveYValueFromXValue(0.6), eps);
|
|
assertRoughlyEquals(0.982973389, bezier.solveYValueFromXValue(0.9), eps);
|
|
}
|