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history/005a1_letter_test/src/main/java/com/gitee/drinkjava2/frog/util/PixelsUtils.java

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+/* Copyright 2018-2020 the original author or 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.gitee.drinkjava2.frog.util;
+
+/**
+ * PixelUtils used to do some transform of pixel picture
+ * 
+ * 针对给定的二维图像，进行一些变换， [0][0]是图像左下角素
+ * 
+ * @author Yong Zhu
+ * @since 2.0.2
+ */
+public class PixelsUtils {
+
+	public static byte[][] offset(byte[][] pixels, int xOff, int yOff) {// 对图像进行xOff和yOff偏移变换
+		int w = pixels.length;
+		int h = pixels[0].length;
+		byte[][] result = new byte[w + Math.abs(xOff)][h + Math.abs(yOff)];
+		for (int y = 0; y < h + Math.abs(yOff); y++) {
+			for (int x = 0; x < w + Math.abs(xOff); x++) {
+				int newX = x - xOff;
+				int newY = y - yOff;
+				if (newX >= 0 && newX < w && newY >= 0 && newY < h && pixels[newX][newY] != 0)
+					result[x][y] = 1;
+				else
+					result[x][y] = 0;
+			}
+		}
+		return result;
+	}
+}