Matrix3 { public Matrix3 multiplyByTranslation(double x, double y) { this.multiplyByMatrix( 1, 0, x, 0, 1, y, 0, 0, 1); return this; } Matrix3();  Matrix3(double m11, double m12, double m13,
                   double m21, double m22, double m23,
                   double m31, double m32, double m33);  Matrix3(Matrix3 matrix); @Override boolean equals(Object o); @Override int hashCode(); @Override String toString(); Matrix3 set(double m11, double m12, double m13,
                       double m21, double m22, double m23,
                       double m31, double m32, double m33); Matrix3 set(Matrix3 matrix); Matrix3 setTranslation(double x, double y); Matrix3 setRotation(double angleDegrees); Matrix3 setScale(double xScale, double yScale); Matrix3 setToIdentity(); Matrix3 setToTranslation(double x, double y); Matrix3 setToRotation(double angleDegrees); Matrix3 setToScale(double xScale, double yScale); Matrix3 setToVerticalFlip(); Matrix3 setToTileTransform(Sector src, Sector dst); Matrix3 setToMultiply(Matrix3 a, Matrix3 b); Matrix3 multiplyByTranslation(double x, double y); Matrix3 multiplyByRotation(double angleDegrees); Matrix3 multiplyByScale(double xScale, double yScale); Matrix3 multiplyByVerticalFlip(); Matrix3 multiplyByTileTransform(Sector src, Sector dst); Matrix3 multiplyByMatrix(Matrix3 matrix); Matrix3 multiplyByMatrix(double m11, double m12, double m13,
                                    double m21, double m22, double m23,
                                    double m31, double m32, double m33); Matrix3 transpose(); Matrix3 transposeMatrix(Matrix3 matrix); float[] transposeToArray(float[] result, int offset); Matrix3 invert(); Matrix3 invertMatrix(Matrix3 matrix); final double[] m; }
@Test public void testMultiplyByTranslation() throws Exception { Matrix3 m1 = new Matrix3(); double dx = 2; double dy = 3; Matrix3 m2 = m1.multiplyByTranslation(dx, dy); assertEquals("m11", 1d, m1.m[0], 0); assertEquals("m12", 0d, m1.m[1], 0); assertEquals("m13", dx, m1.m[2], 0); assertEquals("m21", 0d, m1.m[3], 0); assertEquals("m22", 1d, m1.m[4], 0); assertEquals("m23", dy, m1.m[5], 0); assertEquals("m31", 0d, m1.m[6], 0); assertEquals("m32", 0d, m1.m[7], 0); assertEquals("m33", 1d, m1.m[8], 0); assertSame("fluent api result", m2, m1); }