BitMatrixTestCase.java
/*
* Copyright 2007 ZXing authors
*
* 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.
*/
package com.google.zxing.common;
import org.junit.Assert;
import org.junit.Test;
import java.util.Arrays;
/**
* @author Sean Owen
* @author dswitkin@google.com (Daniel Switkin)
*/
public final class BitMatrixTestCase extends Assert {
private static final int[] BIT_MATRIX_POINTS = { 1, 2, 2, 0, 3, 1 };
@Test
public void testGetSet() {
BitMatrix matrix = new BitMatrix(33);
assertEquals(33, matrix.getHeight());
for (int y = 0; y < 33; y++) {
for (int x = 0; x < 33; x++) {
if (y * x % 3 == 0) {
matrix.set(x, y);
}
}
}
for (int y = 0; y < 33; y++) {
for (int x = 0; x < 33; x++) {
assertEquals(y * x % 3 == 0, matrix.get(x, y));
}
}
}
@Test
public void testSetRegion() {
BitMatrix matrix = new BitMatrix(5);
matrix.setRegion(1, 1, 3, 3);
for (int y = 0; y < 5; y++) {
for (int x = 0; x < 5; x++) {
assertEquals(y >= 1 && y <= 3 && x >= 1 && x <= 3, matrix.get(x, y));
}
}
}
@Test
public void testEnclosing() {
BitMatrix matrix = new BitMatrix(5);
assertNull(matrix.getEnclosingRectangle());
matrix.setRegion(1, 1, 1, 1);
assertArrayEquals(new int[] { 1, 1, 1, 1 }, matrix.getEnclosingRectangle());
matrix.setRegion(1, 1, 3, 2);
assertArrayEquals(new int[] { 1, 1, 3, 2 }, matrix.getEnclosingRectangle());
matrix.setRegion(0, 0, 5, 5);
assertArrayEquals(new int[] { 0, 0, 5, 5 }, matrix.getEnclosingRectangle());
}
@Test
public void testOnBit() {
BitMatrix matrix = new BitMatrix(5);
assertNull(matrix.getTopLeftOnBit());
assertNull(matrix.getBottomRightOnBit());
matrix.setRegion(1, 1, 1, 1);
assertArrayEquals(new int[] { 1, 1 }, matrix.getTopLeftOnBit());
assertArrayEquals(new int[] { 1, 1 }, matrix.getBottomRightOnBit());
matrix.setRegion(1, 1, 3, 2);
assertArrayEquals(new int[] { 1, 1 }, matrix.getTopLeftOnBit());
assertArrayEquals(new int[] { 3, 2 }, matrix.getBottomRightOnBit());
matrix.setRegion(0, 0, 5, 5);
assertArrayEquals(new int[] { 0, 0 }, matrix.getTopLeftOnBit());
assertArrayEquals(new int[] { 4, 4 }, matrix.getBottomRightOnBit());
}
@Test
public void testRectangularMatrix() {
BitMatrix matrix = new BitMatrix(75, 20);
assertEquals(75, matrix.getWidth());
assertEquals(20, matrix.getHeight());
matrix.set(10, 0);
matrix.set(11, 1);
matrix.set(50, 2);
matrix.set(51, 3);
matrix.flip(74, 4);
matrix.flip(0, 5);
// Should all be on
assertTrue(matrix.get(10, 0));
assertTrue(matrix.get(11, 1));
assertTrue(matrix.get(50, 2));
assertTrue(matrix.get(51, 3));
assertTrue(matrix.get(74, 4));
assertTrue(matrix.get(0, 5));
// Flip a couple back off
matrix.flip(50, 2);
matrix.flip(51, 3);
assertFalse(matrix.get(50, 2));
assertFalse(matrix.get(51, 3));
}
@Test
public void testRectangularSetRegion() {
BitMatrix matrix = new BitMatrix(320, 240);
assertEquals(320, matrix.getWidth());
assertEquals(240, matrix.getHeight());
matrix.setRegion(105, 22, 80, 12);
// Only bits in the region should be on
for (int y = 0; y < 240; y++) {
for (int x = 0; x < 320; x++) {
assertEquals(y >= 22 && y < 34 && x >= 105 && x < 185, matrix.get(x, y));
}
}
}
@Test
public void testGetRow() {
BitMatrix matrix = new BitMatrix(102, 5);
for (int x = 0; x < 102; x++) {
if ((x & 0x03) == 0) {
matrix.set(x, 2);
}
}
// Should allocate
BitArray array = matrix.getRow(2, null);
assertEquals(102, array.getSize());
// Should reallocate
BitArray array2 = new BitArray(60);
array2 = matrix.getRow(2, array2);
assertEquals(102, array2.getSize());
// Should use provided object, with original BitArray size
BitArray array3 = new BitArray(200);
array3 = matrix.getRow(2, array3);
assertEquals(200, array3.getSize());
for (int x = 0; x < 102; x++) {
boolean on = (x & 0x03) == 0;
assertEquals(on, array.get(x));
assertEquals(on, array2.get(x));
assertEquals(on, array3.get(x));
}
}
@Test
public void testRotate90Simple() {
BitMatrix matrix = new BitMatrix(3, 3);
matrix.set(0, 0);
matrix.set(0, 1);
matrix.set(1, 2);
matrix.set(2, 1);
matrix.rotate90();
assertTrue(matrix.get(0, 2));
assertTrue(matrix.get(1, 2));
assertTrue(matrix.get(2, 1));
assertTrue(matrix.get(1, 0));
}
@Test
public void testRotate180Simple() {
BitMatrix matrix = new BitMatrix(3, 3);
matrix.set(0, 0);
matrix.set(0, 1);
matrix.set(1, 2);
matrix.set(2, 1);
matrix.rotate180();
assertTrue(matrix.get(2, 2));
assertTrue(matrix.get(2, 1));
assertTrue(matrix.get(1, 0));
assertTrue(matrix.get(0, 1));
}
@Test
public void testRotate180() {
testRotate180(7, 4);
testRotate180(7, 5);
testRotate180(8, 4);
testRotate180(8, 5);
}
@Test
public void testParse() {
BitMatrix emptyMatrix = new BitMatrix(3, 3);
BitMatrix fullMatrix = new BitMatrix(3, 3);
fullMatrix.setRegion(0, 0, 3, 3);
BitMatrix centerMatrix = new BitMatrix(3, 3);
centerMatrix.setRegion(1, 1, 1, 1);
BitMatrix emptyMatrix24 = new BitMatrix(2, 4);
assertEquals(emptyMatrix, BitMatrix.parse(" \n \n \n", "x", " "));
assertEquals(emptyMatrix, BitMatrix.parse(" \n \r\r\n \n\r", "x", " "));
assertEquals(emptyMatrix, BitMatrix.parse(" \n \n ", "x", " "));
assertEquals(fullMatrix, BitMatrix.parse("xxx\nxxx\nxxx\n", "x", " "));
assertEquals(centerMatrix, BitMatrix.parse(" \n x \n \n", "x", " "));
assertEquals(centerMatrix, BitMatrix.parse(" \n x \n \n", "x ", " "));
try {
assertEquals(centerMatrix, BitMatrix.parse(" \n xy\n \n", "x", " "));
fail();
} catch (IllegalArgumentException ex) {
// good
}
assertEquals(emptyMatrix24, BitMatrix.parse(" \n \n \n \n", "x", " "));
assertEquals(centerMatrix, BitMatrix.parse(centerMatrix.toString("x", "."), "x", "."));
}
@Test
public void testParseBoolean() {
BitMatrix emptyMatrix = new BitMatrix(3, 3);
BitMatrix fullMatrix = new BitMatrix(3, 3);
fullMatrix.setRegion(0, 0, 3, 3);
BitMatrix centerMatrix = new BitMatrix(3, 3);
centerMatrix.setRegion(1, 1, 1, 1);
boolean[][] matrix = new boolean[3][3];
assertEquals(emptyMatrix, BitMatrix.parse(matrix));
matrix[1][1] = true;
assertEquals(centerMatrix, BitMatrix.parse(matrix));
for (boolean[] arr : matrix) {
Arrays.fill(arr, true);
}
assertEquals(fullMatrix, BitMatrix.parse(matrix));
}
@Test
public void testUnset() {
BitMatrix emptyMatrix = new BitMatrix(3, 3);
BitMatrix matrix = emptyMatrix.clone();
matrix.set(1, 1);
assertNotEquals(emptyMatrix, matrix);
matrix.unset(1, 1);
assertEquals(emptyMatrix, matrix);
matrix.unset(1, 1);
assertEquals(emptyMatrix, matrix);
}
@Test
public void testXOR() {
BitMatrix emptyMatrix = new BitMatrix(3, 3);
BitMatrix fullMatrix = new BitMatrix(3, 3);
fullMatrix.setRegion(0, 0, 3, 3);
BitMatrix centerMatrix = new BitMatrix(3, 3);
centerMatrix.setRegion(1, 1, 1, 1);
BitMatrix invertedCenterMatrix = fullMatrix.clone();
invertedCenterMatrix.unset(1, 1);
BitMatrix badMatrix = new BitMatrix(4, 4);
testXOR(emptyMatrix, emptyMatrix, emptyMatrix);
testXOR(emptyMatrix, centerMatrix, centerMatrix);
testXOR(emptyMatrix, fullMatrix, fullMatrix);
testXOR(centerMatrix, emptyMatrix, centerMatrix);
testXOR(centerMatrix, centerMatrix, emptyMatrix);
testXOR(centerMatrix, fullMatrix, invertedCenterMatrix);
testXOR(invertedCenterMatrix, emptyMatrix, invertedCenterMatrix);
testXOR(invertedCenterMatrix, centerMatrix, fullMatrix);
testXOR(invertedCenterMatrix, fullMatrix, centerMatrix);
testXOR(fullMatrix, emptyMatrix, fullMatrix);
testXOR(fullMatrix, centerMatrix, invertedCenterMatrix);
testXOR(fullMatrix, fullMatrix, emptyMatrix);
try {
emptyMatrix.clone().xor(badMatrix);
fail();
} catch (IllegalArgumentException ex) {
// good
}
try {
badMatrix.clone().xor(emptyMatrix);
fail();
} catch (IllegalArgumentException ex) {
// good
}
}
public static String matrixToString(BitMatrix result) {
assertEquals(1, result.getHeight());
StringBuilder builder = new StringBuilder(result.getWidth());
for (int i = 0; i < result.getWidth(); i++) {
builder.append(result.get(i, 0) ? '1' : '0');
}
return builder.toString();
}
private static void testXOR(BitMatrix dataMatrix, BitMatrix flipMatrix, BitMatrix expectedMatrix) {
BitMatrix matrix = dataMatrix.clone();
matrix.xor(flipMatrix);
assertEquals(expectedMatrix, matrix);
}
private static void testRotate180(int width, int height) {
BitMatrix input = getInput(width, height);
input.rotate180();
BitMatrix expected = getExpected(width, height);
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
assertEquals("(" + x + ',' + y + ')', expected.get(x, y), input.get(x, y));
}
}
}
private static BitMatrix getExpected(int width, int height) {
BitMatrix result = new BitMatrix(width, height);
for (int i = 0; i < BIT_MATRIX_POINTS.length; i += 2) {
result.set(width - 1 - BIT_MATRIX_POINTS[i], height - 1 - BIT_MATRIX_POINTS[i + 1]);
}
return result;
}
private static BitMatrix getInput(int width, int height) {
BitMatrix result = new BitMatrix(width, height);
for (int i = 0; i < BIT_MATRIX_POINTS.length; i += 2) {
result.set(BIT_MATRIX_POINTS[i], BIT_MATRIX_POINTS[i + 1]);
}
return result;
}
}