BMapTileCutter(Java切图工具）

程序是用Java Web实现, struts2文件标签和简单Js调用。

实现核心代码
1.TileUtils.java
复制代码
1 package com.xiefei.core;
2
3 import java.awt.Graphics2D;
4 import java.awt.Image;
5 import java.awt.Toolkit;
6 import java.awt.Transparency;
7 import java.awt.image.BufferedImage;
8 import java.awt.image.CropImageFilter;
9 import java.awt.image.FilteredImageSource;
10 import java.awt.image.ImageFilter;
11 import java.io.File;
12
13 import javax.imageio.ImageIO;
14
15 public class TileUtils {
16 private int minLevel;
17 private int maxLevel;
18 private int picLevel;
19 private double mercatorX;
20 private double mercatorY;
21 private String pic;
22 private String savePath;
//代码效果参考：http://www.zidongmutanji.com/bxxx/216116.html

24 public TileUtils(String pic, double mercatorX, double mercatorY,
25 String savePath) {
26 this.pic = pic;
27 this.mercatorX = mercatorX;
28 this.mercatorY = mercatorY;
29 this.savePath = savePath;
30 }
31
32 public TileUtils(String pic, int minLevel, int maxLevel, int picLevel, double mercatorX,
33 double mercatorY, String savePath) {
34 this.pic = pic;
35 this.minLevel = minLevel;
36 this.maxLevel = maxLevel;
37 this.mercatorX = mercatorX;
38 this.mercatorY = mercatorY;
39 this.savePath = savePath;
40 this.picLevel = picLevel;
41 }
42
43 public void cutterAll() throws Exception {
44 for (int i = minLevel; i <= maxLevel; i++) {
45 cutterOne(i);
46 }
47 }
48
49 public void cutterOne(int level) throws Exception {
50 //图片中心的像素坐标(pixelX,pixelY)，图片中心的平面坐标即魔卡托坐标(mercatorX, mercatorY)
51 //像素坐标 = 平面坐标 Math.pow(2, level - 18)
52 double pixelX = mercatorX Math.pow(2, level - 18);
53 double pixelY = mercatorY Math.pow(2, level - 18);
54 System.out.println("pixelX : " + pixelX);
55 System.out.println("pixelY : " + pixelY);
56 BufferedImage bi = ImageIO.read(new File(pic));
57 int width = bi.getWidth();
58 int height = bi.getHeight();
59 //图片遵循原则：当前图片所属级别picLevel不缩放即像素级别相等。
60 //按照公式缩放：当前级别图片长度 = 原图片长度 Math.pow(2, level - picLevel)
61 //minX: 图片左下角X坐标
62 //minY: 图片左下角Y坐标
63 //maxX: 图片右上角X坐标
64 //maxY: 图片右上角Y坐标
65 double minX = pixelX - width Math.pow(2, level - picLevel) / 2;
66 double minY = pixelY - height Math.pow(2, level - picLevel) / 2;
67 double maxX = pixelX + width Math.pow(2, level - picLevel) / 2;
68 double maxY = pixelY + height Math.pow(2, level - picLevel) / 2;
69 System.out.println("(minX,minY) = (" + minX + ", " + minY + ")" );
70 System.out.println("(maxX,maxY) = (" + maxX + ", " + maxY + ")" );
71 int neatMinX = (int) minX / 256;
72 int remMinX = (int) minX % 256;
73 int neatMinY = (int) minY / 256;
74 int remMinY = (int) minY % 256 ;
75
76 int neatMaxX = (int) maxX / 256;
77 int remMaxX = 256 - (int) maxX % 256;
78 int neatMaxY = (int) maxY / 256;
79 int remMaxY = 256 - (int) maxY % 256;
80 //(neatMinX,neatMinY)为图片左下角最近的整数图块坐标,neatMinX到neatMaxX即当前级别下切割图块的图块坐标x
81 //(neatMaxX,neatMaxY)为图片右上角最近的整数图块坐标,neatMinY到neatMaxY即当前级别下切割图块的图块坐标y
82 System.out.println("neatMinX: " + neatMinX);
83 System.out.println("neatMaxX: " + neatMaxX);
84 System.out.println("neatMinY: " + neatMinY);
85 System.out.println("neatMaxY: " + neatMaxY);
86 System.out.println("remMinX width remMaxX : " + remMinX + " "+ width + " "+ remMaxX );
87 System.out.println("remMinY height remMaxY : " + remMinY + " " + height +" " + remMaxY );
88
89 // 扩充原图片为width height --- > (remMinX + width + remMaxX ) (remMinY +
90 // height +remMaxY)
91 int extendWidth = (neatMaxX - neatMinX + 1 ) 256;
92 int extendHeight = (neatMaxY - neatMinY + 1 ) 256;
93 System.out.println("extendWidth: " + extendWidth);
94 System.out.println("extendHeight: " + extendHeight);
95
96 BufferedImage outputImage = null;
97 Graphics2D g = bi.createGraphics();
98 BufferedImage extend = g.getDeviceConfiguration().createCompatibleImage(extendWidth, extendHeight, Transparency.TRANSLUCENT);
99 g.dispose();
100 g = extend.createGraphics();
101 g.drawImage(extend, 0, 0, extendWidth, extendHeight, null);
102 g.drawImage(bi, remMinX, remMaxY, (int) (width Math.pow(2, level - picLevel)), (int)(height Math.pow(2, level - picLevel)), null);
103 outputImage = extend;
104
105 //切割图片，共( neatMaxX - neatMinX + 1) (neatMaxY - neatMinY + 1)份 256256图片
106 String dirName = savePath.substring(0, savePath.lastIndexOf("\")) + "\tiles\" + level;
107 System.out.println("dirName : " + dirName);
//代码效果参考：http://www.zidongmutanji.com/bxxx/22470.html

109
110 File dir = new File(dirName);
111 Image image = extend.getScaledInstance(extendWidth, extendHeight, Image.SCALE_DEFAULT);
112 if(dir.exists()) {
113 System.out.println("创建目录失败！, 目录已存在！");
114 } else {
115 if(dir.mkdirs()) {
116 ImageIO.write(extend, "png", new File(dirName + savePath.substring(savePath.lastIndexOf("\"))));
117 System.out.println("savePath : " + dirName + savePath.substring(savePath.lastIndexOf("\")));
118 System.out.println("Extend success!");
119 int w = neatMaxX - neatMinX + 1;
120 int h = neatMaxY - neatMinY + 1;
121 for(int i = 0; i < w; i++) {
122 for(int j = 1; j <= h; j++) {
123 ImageFilter cropFilter = new CropImageFilter(256 i, 256 (h - j), 256, 256);
124 Image img = Toolkit.getDefaultToolkit().createImage(new FilteredImageSource(image.getSource(),cropFilter));
125 BufferedImage tag = new BufferedImage(256, 256 , BufferedImage.TYPE_INTBGR);
126 Graphics2D gs = tag.createGraphics();
127 tag = gs.getDeviceConfiguration().createCompatibleImage(256, 256, Transparency.TRANSLUCENT);
128 gs.dispose();
129 gs = tag.createGraphics();
130 gs.drawImage(img, 0, 0, null);
131 g.dispose();
132 String cropPicName = dirName + "\tile" + (neatMinX + i) + "" + (neatMinY + j - 1) + ".png";
133 ImageIO.write(tag, "png", new File(cropPicName));
134 }
135 }
136 System.out.println("切割图片成功！");
137 } else {
138 System.out.println("创建目录失败！");
139 }
140 }
141 }
142
143 }
代码的核心思想是将原图片外围拓展成256整数倍长度（最小包围），即源代码中的extendWidth extendHeight图片长度，然后再横竖切割成多个256256的瓦片图块。
2.index.jsp(切割图片主页)
1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2 <%
3 String path = request.getContextPath();
4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
5 %>
6 <%@ taglib prefix="s" uri="/struts-tags" %>
7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
8