关于java图片切割的小demo

写此demo 的起因

         意图仿写一个flappybird,想获取flappybird的图片资源，反编译apk之后发现它的图片都被整合成了一张大图，如下

                                       

          atlas.png

       另发现一与之对应的atlas.txt文件，如图

                                     

                                              

        经研究发现，第一列为小图片文件名，第二三列为图片宽高，第四五列为图片在原图的x,y坐标的比例值，第六七列为图片宽高占原图的比例值

可以根据此文件确定小图片的基本属性，也知道小图片在大图的位置，遂开工。

       最终结果展示

                               

 

代码

            ImageBean类

public class ImageBean {private String name;private int x;private int y;private int w;private int h;public ImageBean(String name, int x, int y, int w, int h) {this.name = name;this.x = x;this.y = y;this.w = w;this.h = h;}public String getName() {return name;}public int getX() {return x;}public int getY() {return y;}public int getW() {return w;}public int getH() {return h;}@Overridepublic String toString() {return name+" "+x+" "+y+" "+w+" "+h;}}

            文本文件解析类

<pre name="code" class="java">import java.io.File;import java.io.FileInputStream;import java.util.ArrayList;import java.util.Scanner;public class TxtUtil {/** * @param txtPath String 文本文件路径 * @return list ArrayList<String []> 以字符串数组为单位的动态顺序链表 * */public static ArrayList<String[]> getArrayList(String txtPath){ArrayList<String []> list = null;File file = null;FileInputStream inputStream = null;Scanner scanner = null;try {list = new ArrayList<>();file = new File(txtPath);inputStream = new FileInputStream(file);scanner = new Scanner(inputStream);while (scanner.hasNextLine()) {String lineString = scanner.nextLine();String[] result = lineString.split(" ");list.add(result);}} catch (Exception e) {e.printStackTrace();} finally {try {inputStream.close();scanner.close();} catch (Exception e) {}}return list;}}

     获取image集合类

import java.util.ArrayList;public class ImageUtil {public static ArrayList<ImageBean> getImageBeans(int imageSize,String txtPath){ArrayList<ImageBean> imageBeans = new ArrayList<>();ArrayList<String []> list = TxtUtil.getArrayList(txtPath);for (String[] strings : list) {String name = strings[0];int x = (int) (imageSize*Float.parseFloat(strings[3]));int y = (int) (imageSize*Float.parseFloat(strings[4]));int w = (int) (imageSize*Float.parseFloat(strings[5]));int h = (int) (imageSize*Float.parseFloat(strings[6]));imageBeans.add(new ImageBean(name,x,y,w,h));}return imageBeans;}}

imagecut类 

       

import java.awt.Rectangle;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.util.ArrayList;import javax.imageio.ImageIO;import javax.imageio.ImageReadParam;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;/** * @author Guxingke *  * 图片切割的小demo *  * */public class ImageCut {public static void main(String[] args) throws IOException {//定义文本文件、初始图片路径String txtPath = "res/res1/atlas.txt";String srcpath = "res/res1/atlas.png";//原文件尺寸，一般都是正方形int imageSize = 1024;//剪切后图片的保存路径String subpath = "result/cut1/";ArrayList<ImageBean> imageBeans = ImageUtil.getImageBeans(imageSize,txtPath);for (ImageBean imageBean : imageBeans) {cut(srcpath, subpath, imageBean);}System.out.println("success");}/** * @param srcpath String 原文件路径 * @param subpath String 切割后的存盘路径 * @param imageBean ImageBean  *  * 根据原文件路径，切割后的存盘路径，imageBean ，切割图片 并保存 * */public static void cut(String srcpath, String subpath,ImageBean imageBean) throws IOException {        FileInputStream is = null;        ImageInputStream iis = null;        try {        //ImageReader 初始化        ImageReader reader = (ImageReader) ImageIO        .getImageReadersByFormatName("png").next();            is = new FileInputStream(srcpath);            iis = ImageIO.createImageInputStream(is);            reader.setInput(iis, true);                        //获取需要剪切的图片部分的 BufferImage 对象            ImageReadParam param = reader.getDefaultReadParam();            Rectangle rect = new Rectangle(imageBean.getX(), imageBean.getY(), imageBean.getW(), imageBean.getH());            param.setSourceRegion(rect);            BufferedImage bi = reader.read(0, param);                        //输出存盘位置 并存盘            System.out.println(subpath+imageBean.getName()+".png");            ImageIO.write(bi, "png", new File(subpath+imageBean.getName()+".png"));        } catch(Exception e){        e.printStackTrace();        }finally {            if (is != null)                is.close();            if (iis != null)                iis.close();        }    }}

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