85 lines
2.9 KiB
Java
85 lines
2.9 KiB
Java
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/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.inputmethod.keyboard.internal;
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import com.android.inputmethod.keyboard.internal.MatrixUtils.MatrixOperationFailedException;
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import android.test.AndroidTestCase;
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import android.test.suitebuilder.annotation.SmallTest;
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@SmallTest
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public class MatrixUtilsTests extends AndroidTestCase {
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// "run tests" -c com.android.inputmethod.keyboard.internal.MatrixUtilsTests
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private static final boolean DEBUG = false;
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private static final float EPSILON = 0.00001f;
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private static void assertEqualsFloat(float f0, float f1) {
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assertEqualsFloat(f0, f1, EPSILON);
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}
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/* package */ static void assertEqualsFloat(float f0, float f1, float error) {
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assertTrue(Math.abs(f0 - f1) < error);
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}
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public void testMulti() {
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final float[][] matrixA = {{1, 2}, {3, 4}};
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final float[][] matrixB = {{5, 6}, {7, 8}};
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final float[][] retval = new float[2][2];
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try {
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MatrixUtils.multiply(matrixA, matrixB, retval);
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} catch (MatrixOperationFailedException e) {
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assertTrue(false);
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}
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if (DEBUG) {
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MatrixUtils.dump("multi", retval);
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}
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assertEqualsFloat(retval[0][0], 19);
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assertEqualsFloat(retval[0][1], 22);
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assertEqualsFloat(retval[1][0], 43);
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assertEqualsFloat(retval[1][1], 50);
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}
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public void testInverse() {
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final int N = 4;
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final float[][] matrix =
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{{1, 2, 3, 4}, {4, 0, 5, 6}, {6, 4, 2, 0}, {6, 4, 2, 1}};
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final float[][] inverse = new float[N][N];
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final float[][] tempMatrix = new float[N][N];
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for (int i = 0; i < N; ++i) {
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for (int j = 0; j < N; ++j) {
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tempMatrix[i][j] = matrix[i][j];
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}
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}
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final float[][] retval = new float[N][N];
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try {
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MatrixUtils.inverse(tempMatrix, inverse);
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} catch (MatrixOperationFailedException e) {
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assertTrue(false);
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}
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try {
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MatrixUtils.multiply(matrix, inverse, retval);
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} catch (MatrixOperationFailedException e) {
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assertTrue(false);
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}
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for (int i = 0; i < N; ++i) {
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for (int j = 0; j < N; ++j) {
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assertEqualsFloat(((i == j) ? 1.0f : 0.0f), retval[i][j]);
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}
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}
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}
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}
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