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Fix all tests for Matrix decomposition.

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This commit is contained in:
Jürg Lehni 2013-02-08 23:25:10 -08:00
parent e438ac8223
commit aec13ffd43
2 changed files with 34 additions and 51 deletions
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1
src/basic/Matrix.js
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@ -471,6 +471,7 @@ var Matrix = this.Matrix = Base.extend(/** @lends Matrix# */{
decompose: function() {
// http://dev.w3.org/csswg/css3-2d-transforms/#matrix-decomposition
// http://stackoverflow.com/questions/4361242/
// https://github.com/wisec/DOMinator/blob/master/layout/style/nsStyleAnimation.cpp#L946
var a = this._a, b = this._b, c = this._c, d = this._d;
if (Numerical.isZero(a * d - b * c))
return {};

84
test/tests/Matrix.js
View file

@ -12,14 +12,14 @@
module('Matrix');
test('Decomposition: rotate()', function() {
function testAngle(angle, expected) {
equals(new Matrix().rotate(angle).getRotation(),
Base.pick(expected, angle),
'new Matrix().rotate(' + angle + ').getRotation()',
Numerical.TOLERANCE);
equals(new Matrix().rotate(angle).getScaling(),
new Point(1, 1),
'new Matrix().rotate(' + angle + ').getScaling()');
function testAngle(a, ea) {
var m = new Matrix().rotate(a),
s = 'new Matrix().rotate(' + a + ')';
equals(m.getRotation(), Base.pick(ea, a),
s + '.getRotation()',
Numerical.TOLERANCE);
equals(m.getScaling(), new Point(1, 1),
s + '.getScaling()');
}
testAngle(0);
@ -38,58 +38,40 @@ test('Decomposition: rotate()', function() {
});
test('Decomposition: scale()', function() {
function testScale(sx, sy) {
var flipped = sx < 0 && sy < 0;
equals(new Matrix().scale(sx, sy).getScaling(),
new Point(flipped ? -sx : sx, flipped ? -sy : sy),
'new Matrix().scale(' + sx + ', ' + sy + ').getScaling()');
equals(new Matrix().scale(sx, sy).getRotation(),
flipped ? 180 : 0,
'new Matrix().scale(' + sx + ', ' + sy + ').getRotation()',
Numerical.TOLERANCE);
function testScale(sx, sy, ex, ey, ea) {
var m = new Matrix().scale(sx, sy),
s = 'new Matrix().scale(' + sx + ', ' + sy + ')';
equals(m.getScaling(), new Point(Base.pick(ex, sx), Base.pick(ey, sy)),
s + '.getScaling()');
equals(m.getRotation(), ea || 0,
s + '.getRotation()',
Numerical.TOLERANCE);
}
testScale(1, 1);
testScale(1, -1);
testScale(1, -1, -1, 1, -180); // Decomposing results in correct flipping
testScale(-1, 1);
testScale(-1, -1);
testScale(-1, -1, 1, 1, 180); // Decomposing results in correct flipping
testScale(2, 4);
testScale(2, -4);
testScale(2, -4, -2, 4, -180); // Decomposing results in correct flipping
testScale(4, 2);
testScale(-4, 2);
testScale(-4, -4);
testScale(-4, -4, 4, 4, 180); // Decomposing results in correct flipping
});
test('Decomposition: rotate() & scale()', function() {
equals(function() {
return new Matrix().scale(2, 4).rotate(45).getScaling();
}, new Point(2, 4));
function testAngleAndScale(sx, sy, a, ex, ey, ea) {
var m = new Matrix().scale(sx, sy).rotate(a),
s = 'new Matrix().scale(' + sx + ', ' + sy + ').rotate(' + a + ')';
equals(m.getScaling(), new Point(Base.pick(ex, sx), Base.pick(ey, sy)),
s + '.getScaling()');
equals(m.getRotation(), ea || a,
s + '.getRotation()',
Numerical.TOLERANCE);
}
equals(function() {
return new Matrix().scale(2, 4).rotate(45).getRotation();
}, 45);
equals(function() {
return new Matrix().scale(2, -4).rotate(45).getScaling();
}, new Point(2, -4));
equals(function() {
return new Matrix().scale(2, -4).rotate(45).getRotation();
}, 45);
equals(function() {
return new Matrix().scale(-2, 4).rotate(45).getScaling();
}, new Point(-2, 4));
equals(function() {
return new Matrix().scale(-2, 4).rotate(45).getRotation();
}, 45);
equals(function() {
return new Matrix().scale(-2, -4).rotate(45).getScaling();
}, new Point(-2, -4));
equals(function() {
return new Matrix().scale(-2, -4).rotate(45).getRotation();
}, 45);
testAngleAndScale(2, 4, 45);
testAngleAndScale(2, -4, 45, -2, 4, -135);
testAngleAndScale(-2, 4, 45);
testAngleAndScale(-2, -4, 45, 2, 4, -135);
});