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feat: 字符图案，我用字符画个冰墩墩(https://www.wdbyte.com/java/char-image.html)
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‎README.md‎

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@@ -142,6 +142,7 @@ Java 版本任你发，我用 Java 8 。但是多学点这种装x技巧总没错
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## ⏳ Java 开发
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- [字符图案，我用字符画个冰墩墩](https://www.wdbyte.com/java/char-image.html)
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- [Java 中 RMI 的使用](https://www.wdbyte.com/2021/05/java/java-rmi/)
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- [如何使用 Github Actions 自动抓取每日必应壁纸?](https://www.wdbyte.com/2021/03/bing-wallpaper-github-action/)
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- [三种骚操作绕过迭代器遍历时的数据修改异常](https://www.wdbyte.com/2021/02/develop/interator-update/)

‎core-java-modules/README.md‎

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- [Java 中的监控与管理原理概述](https://www.wdbyte.com/java/monitoring.html)
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- [使用 JMX 监控和管理 Java 程序](https://www.wdbyte.com/java/jmx.html)
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- [Java 中的 5 个代码性能提升技巧](https://www.wdbyte.com/java/code-5-tips.html)
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- [Java 中的 5 个代码性能提升技巧](https://www.wdbyte.com/java/code-5-tips.html)
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- [字符图案，我用字符画个冰墩墩](https://www.wdbyte.com/java/char-image.html)

‎core-java-modules/core-java-io/README.md‎

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## core-java-performance-code
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当前模块包含 IO 相关代码
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### 相关文章
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- [字符图案，我用字符画个冰墩墩](https://www.wdbyte.com/java/char-image.html)

‎core-java-modules/core-java-io/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>core-java-modules</artifactId>
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<groupId>com.wdbyte.core-java-modules</groupId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-io</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<name>core-java-io</name>
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<packaging>jar</packaging>
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<properties>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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</properties>
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</project>

‎core-java-modules/core-java-io/src/main/java/com/wdbyte/io/image/GeneratorTextImage.java‎

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package com.wdbyte.io.image;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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/**
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* <p>
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* 根据图片生成字符图案
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* 1.图片大小缩放
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* 2.遍历图片像素点
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* 3.获取图片像素点亮度
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* 4.匹配字符
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* 5.输出图案
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*
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* @website https://www.wdbyte.com
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*/
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public class GeneratorTextImage {
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public static void main(String[] args) throws Exception {
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BufferedImage image = resizeImage("/Users/darcy/Downloads/sanli.jpg", 120);
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printImage(image);
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}
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/**
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* 图片缩放
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*
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* @param srcImagePath 图片路径
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* @param targetWidth 目标宽度
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* @return
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* @throws IOException
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*/
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public static BufferedImage resizeImage(String srcImagePath, int targetWidth) throws IOException {
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Image srcImage = ImageIO.read(new File(srcImagePath));
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int targetHeight = getTargetHeight(targetWidth, srcImage);
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BufferedImage resizedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
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Graphics2D graphics2D = resizedImage.createGraphics();
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graphics2D.drawImage(srcImage, 0, 0, targetWidth, targetHeight, null);
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graphics2D.dispose();
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return resizedImage;
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}
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/**
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* 图片缩放
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*
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* @param srcImagePath 图片路径
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* @param targetWidth 目标宽度
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* @return
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* @throws IOException
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*/
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public static BufferedImage resizeImage2(String srcImagePath, int targetWidth) throws IOException {
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Image srcImage = ImageIO.read(new File(srcImagePath));
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int targetHeight = getTargetHeight(targetWidth, srcImage);
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Image image = srcImage.getScaledInstance(targetWidth, targetHeight, Image.SCALE_DEFAULT);
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BufferedImage bufferedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
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bufferedImage.getGraphics().drawImage(image, 0, 0, null);
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return bufferedImage;
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}
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/**
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* 根据指定宽度，计算等比例高度
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*
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* @param targetWidth 目标宽度
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* @param srcImage 图片信息
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* @return
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*/
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private static int getTargetHeight(int targetWidth, Image srcImage) {
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int targetHeight = srcImage.getHeight(null);
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if (targetWidth < srcImage.getWidth(null)) {
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targetHeight = Math.round((float)targetHeight / ((float)srcImage.getWidth(null) / (float)targetWidth));
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}
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return targetHeight;
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}
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/**
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* 图片打印
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*
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* @param image
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* @throws IOException
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*/
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public static void printImage(BufferedImage image) throws IOException {
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final char[] PIXEL_CHAR_ARRAY = {'W', '@', '#', '8', '&', '*', 'o', ':', '.', ' '};
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int width = image.getWidth();
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int height = image.getHeight();
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for (int i = 0; i < height; i++) {
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for (int j = 0; j < width; j++) {
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int rgb = image.getRGB(j, i);
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Color color = new Color(rgb);
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int red = color.getRed();
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int green = color.getGreen();
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int blue = color.getBlue();
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// 一个用于计算RGB像素点灰度的公式
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Double grayscale = 0.2126 * red + 0.7152 * green + 0.0722 * blue;
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double index = grayscale / (Math.ceil(255 / PIXEL_CHAR_ARRAY.length) + 0.5);
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System.out.print(PIXEL_CHAR_ARRAY[(int)(Math.floor(index))]);
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}
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System.out.println();
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}
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}
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}

‎core-java-modules/core-java-io/src/main/resources/bingdundun.jpeg‎

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‎core-java-modules/core-java-io/src/main/resources/sanli.jpg‎

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‎core-java-modules/core-java-io/src/main/resources/tiger.png‎

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