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<title>Geometry Interfaces: DOMMatrixReadOnly inverse</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
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<script>
test(function() {
    var matrix2d = new DOMMatrixReadOnly([1, 2, 3, 4, 5, 6]);
    var inverse = matrix2d.inverse();
    assert_true(inverse.is2D);
    assert_equals(inverse.a, -2);
    assert_equals(inverse.b, 1);
    assert_equals(inverse.c, 1.5);
    assert_equals(inverse.d, -0.5);
    assert_equals(inverse.e, 1);
    assert_equals(inverse.f, -2);
}, "DOMMatrix inverse() - invertible - 2D matrix");

test(function() {
    var matrix2d = new DOMMatrixReadOnly([1, 1, 1, 1, 1, 1]);
    var inverse =matrix2d.inverse();
    assert_false(inverse.is2D);
    assert_equals(inverse.a, NaN);
    assert_equals(inverse.b, NaN);
    assert_equals(inverse.c, NaN);
    assert_equals(inverse.d, NaN);
    assert_equals(inverse.e, NaN);
    assert_equals(inverse.f, NaN);
}, "DOMMatrix inverse() - uninvertible - 2D matrix");

test(function() {
    var matrix3d = new DOMMatrixReadOnly([10, 20, 30, 40, 40, 40, 30, 20, 10, 20, 40, 30, 20, 40, 50, 100]);
    var inverse = matrix3d.inverse();
    assert_false(inverse.is2D);
    assert_equals(inverse.m11, -1.6);
    assert_equals(inverse.m12, 0.05);
    assert_equals(inverse.m13, 0.6);
    assert_equals(inverse.m14, 0.45);
    assert_equals(inverse.m21, 2.05);
    assert_equals(inverse.m22, -0.025);
    assert_equals(inverse.m23, -0.8);
    assert_equals(inverse.m24, -0.575);
    assert_equals(inverse.m31, -0.4);
    assert_equals(inverse.m32, 0);
    assert_equals(inverse.m33, 0.2);
    assert_equals(inverse.m34, 0.1);
    assert_equals(inverse.m41, -0.3);
    assert_equals(inverse.m42, -0);
    assert_equals(inverse.m43, 0.1);
    assert_equals(inverse.m44, 0.1);
}, "DOMMatrix inverse() - invertible - 3D matrix");

test(function() {
    var matrix3d = new DOMMatrixReadOnly([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
    var inverse = matrix3d.inverse();
    assert_false(inverse.is2D);
    assert_equals(inverse.m11, NaN);
    assert_equals(inverse.m12, NaN);
    assert_equals(inverse.m13, NaN);
    assert_equals(inverse.m14, NaN);
    assert_equals(inverse.m21, NaN);
    assert_equals(inverse.m22, NaN);
    assert_equals(inverse.m23, NaN);
    assert_equals(inverse.m24, NaN);
    assert_equals(inverse.m31, NaN);
    assert_equals(inverse.m32, NaN);
    assert_equals(inverse.m33, NaN);
    assert_equals(inverse.m34, NaN);
    assert_equals(inverse.m41, NaN);
    assert_equals(inverse.m42, NaN);
    assert_equals(inverse.m43, NaN);
    assert_equals(inverse.m44, NaN);
}, "DOMMatrix inverse() - uninvertible - 3D matrix");
</script>
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