java生成曲线图

package com.test;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Polygon;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;

import javax.imageio.ImageIO;
/**
 * 绘制曲线图
 * @author wzztestin
 *
 */
public class CreateQxImage {

	private static Font mFont = new Font("宋体", Font.BOLD, 12);

	public static void main(String[] args) {
		double[] value = { 18.57d, 2.25d, 10.83d, 16.38d, 14.35d };
		createimage(value, 18.57d);
	}
	
	/**
	 * 绘制图生片
	 * @param value
	 * @param maxvalue
	 */
	private static void createimage(double[] value, double maxvalue) {
		try {
			int width = 764, height = 168;
			BufferedImage image = new BufferedImage(width, height,
					BufferedImage.TYPE_INT_RGB);

			// 绘制图像
			Graphics g = image.getGraphics();
			// 背景色
			g.setColor(new Color(255, 255,255));
			g.fillRect(1, 1, width - 1, height - 1);
			g.setColor(new Color(255, 255,255));
			g.drawRect(0, 0, width - 1, height - 1);
			
			//初始化下部默认部分
			g.setColor(new Color(227, 227, 227));
			g.fillRect(0, 108, width, 60);
			g.drawRect(0, 108, width, 60);
			
			int y = 108;
			//保存y轴数据高度的数组
			int[] tempy = new int[5];
			int temp_y = 0;
			//开始绘图
			for(int i = 0;i<= value.length;i++){
				if(i < value.length){
					temp_y = y-(int)Math.round(60*(value[i]/maxvalue));
					tempy[i] = temp_y;
				}
				Polygon filledPolygon=new Polygon();
				if(i == 0){
					filledPolygon.addPoint(0,y);    
					filledPolygon.addPoint(68,y);    
					filledPolygon.addPoint(68,temp_y);    
					g.setColor(new Color(227, 227, 227)); 
					g.fillPolygon(filledPolygon);
					g.drawPolygon(filledPolygon);
				}else if(i > 0 && i < value.length){
					filledPolygon.addPoint(i*136-68,tempy[i-1]);    
					filledPolygon.addPoint(i*136-68,y);
					filledPolygon.addPoint((i+1)*136-68,y); 
					filledPolygon.addPoint((i+1)*136-68,temp_y);    
					g.setColor(new Color(227, 227, 227)); 
					g.fillPolygon(filledPolygon);
					g.drawPolygon(filledPolygon);
				}else{
					filledPolygon.addPoint(i*136-68,tempy[i-1]);    
					filledPolygon.addPoint(i*136-68,y);
					filledPolygon.addPoint(width,y);   
					g.setColor(new Color(227, 227, 227)); 
					g.fillPolygon(filledPolygon);
					g.drawPolygon(filledPolygon);
				}
			}
			
			//在图上加上图标
			for(int j = 0;j<value.length;j++){
				BufferedImage img = ImageIO.read(new File("d:\\1.png")); 
				g.drawImage(img, (j+1)*136-76,tempy[j]-8, 16, 16, null);
			}
			
			//在图标上部写字
			Color c = new Color(181, 181, 181);
			for(int j = 0;j<value.length;j++){
				g.setColor(c);
				g.setFont(mFont);
				g.drawString(value[j]+"MB", (j+1)*136-92,tempy[j]-16);
			}
			g.dispose();
			
			// 产生图像
			String filename = "d:\\createqximg.jpg";
			File file = new File(filename);
			if (!file.exists()) {
				file.createNewFile();
			}
			FileOutputStream s = new FileOutputStream(file);
			ImageIO.write(image, "JPEG", s);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}