helloworld

来源：互联网发布：手机抠图用什么软件编辑：程序博客网时间：2024/05/01 02:56

package USTC;

import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import java.awt.image.*;
import java.awt.*;

/**
*
* Title:生成chart 的类
* Description:
* Copyright: Copyright (c) 2005
* 作者：汪征
* @version 1.0
*/
public class ChartGraphics {
public ChartGraphics() {
 try {
 jbInit();
 }
 catch (Exception ex) {
 ex.printStackTrace();
 }
}

BufferedImage image;

private void createImage(String fileLocation) {

try {

      FileOutputStream fos = new FileOutputStream(fileLocation);
      BufferedOutputStream bos = new BufferedOutputStream(fos);
      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
      encoder.encode(image);
      bos.close();
    }
    catch (Exception e) {
      System.out.println(e);
    }
}

/**
 * 该方法用于绘出图片的内容。
 * 使用方法： cg.graphicsGeneration(6,"d://yang.txt","d://chart.jpg");
 * @param num int：为统计的图的个数，这个个数与fliename文本中的行树对应
 * @param filename String:读取数据的文件全路径，文件格式如下：yang.txt
 * 45
 * chian
 * 43
 * jepae
 * 23
 * mericant
 * 453
 * frach
 * 60
 * england
 * 24
 * hello
 *注意：柱的最大高度200，不能超过8个柱
 * @param newfile String：显示而生成的图的文件全路径
 */
public void graphicsGeneration(int num, String filename, String newfile) {

final int X = 10;
 int imageWidth = 300; //图片的宽度
 int imageHeight = 300; //图片的高度
 int columnWidth = 30; //柱的宽度
 int columnHeight = 200; //柱的最大高度
 int heightArray[] = new int[num];
 String title[] = new String[num];
 try {
 RandomAccessFile randomAccessFile = new RandomAccessFile(filename, "r");
 for (int i = 0; i < 2 * num; i++) {
 if ( (i % 2) == 0) {
 heightArray[i / 2] = Integer.parseInt(randomAccessFile.readLine());//读取高度
 }
 else {
 String tmpstr=new String(randomAccessFile.readLine().toString().getBytes("8859_1"),"GB2312");

          title[i / 2] = tmpstr;//读取标题
        }
      }
    }
    catch (Exception e) {
      System.out.println(e);
    }

ChartGraphics chartGraphics = new ChartGraphics();
 chartGraphics.image = new BufferedImage(imageWidth, imageHeight,
 BufferedImage.TYPE_INT_RGB);
 Graphics graphics = chartGraphics.image.getGraphics();
 graphics.setColor(Color.white);
 graphics.fillRect(0, 0, imageWidth, imageHeight);
 graphics.setColor(Color.red);
 for (int j = 0; j < num; j++) {
 //坐标的原点在左上角。
 //columnHeight代表的是最高的地方，columnHeight-heightArray[j]代表的是显示图的每个列的最上方的Y坐标。
 //Y=0是显示图的最高点
 graphics.drawRect(X + (j + 1) * columnWidth, columnHeight - heightArray[j],
 columnWidth, heightArray[j]);
 graphics.setColor(Color.getHSBColor(j * 13 + 257, j * 5 + 147,
 j * 35 + 71));
 graphics.fillRect(X + (j + 1) * columnWidth, columnHeight - heightArray[j],
 columnWidth, heightArray[j]);
 graphics.setColor(Color.BLACK);
 if (columnHeight - heightArray[j] - 10 < 10) {
 graphics.drawString(title[j], X + (j + 1) * columnWidth, columnHeight);
 }
 else {
 graphics.drawString(title[j], X + (j + 1) * columnWidth,
 columnHeight - heightArray[j] - 10);
 }
 }
 //graphics.drawRect(X+2*columnWidth, columnHeight-h2, columnWidth, h2);
 //graphics.drawRect(X+3*columnWidth, columnHeight-h3, columnWidth, h3);
 //graphics.drawRect(X+4*columnWidth, columnHeight-h4, columnWidth, h4);
 //graphics.drawRect(X+5*columnWidth, columnHeight-h5, columnWidth, h5);
 chartGraphics.createImage(newfile);
}

private void jbInit() throws Exception {
}
}