rect.java

简单的‘基于web的图表生成系统’

package rect;

import java.awt.image.*;
import java.awt.*;
import java.awt.geom.*;
import ajax.DataExchange;

public class Rect {
	private String[] book ={"JAVA",".NET","C","PB","PASCAL"};
	private int[] month={1,2,3,4,5,6};
	private int[] sellQuantity = new int[month.length];
	private Color[] bookColor = {
			new Color(230,111, 71),
			new Color(107,165,239),
			new Color(200,200,100),
			new Color(120,100,200),
			new Color(220,100,220)};
	
	//获取销售量
	public int[] getData(int month){
		DataExchange de=new DataExchange();
		return de.getData(month);
	}
	
	public BufferedImage drawRectCube(){
		int width = 500, height = 375;
		
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		
		// 创建Java2D对象
		Graphics2D g2d = image.createGraphics();
		
		// 打开反锯齿功能
		g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		
		// 填充整个背景
		g2d.setPaint(Color.WHITE);
		g2d.fillRect(0, 0, width, height);
		
		// 绘制阴影，由灰色渐进圆角矩形组成
		GradientPaint grayGP = new GradientPaint(0, 0, Color.GRAY, width, height, new Color(218, 214, 212), false);
		g2d.setPaint(grayGP);
		RoundRectangle2D.Float bgRR = new RoundRectangle2D.Float(5, 5, width-5, height-5 , 50, 50);
		g2d.fill(bgRR);
		
		// 绘制渐进蓝色圆角矩形背景
		GradientPaint blueGP = new GradientPaint(0, 0, new Color(14, 97, 147), 0, height, new  Color(240, 243, 247), false);
		g2d.setPaint(blueGP);
		g2d.fillRoundRect(0, 0, width-5, height-5, 50, 50);
		
		// 绘制深蓝色圆角矩形轮廓
		BasicStroke bs = new BasicStroke(1.2f);
		g2d.setStroke(bs);
		g2d.setPaint(new Color(55,71, 105));
		g2d.drawRoundRect(0, 0, width-5, height-5, 50, 50);
		
		// 绘制图表绘图区域背景的阴影效果
		Rectangle2D.Float drawArea = new Rectangle2D.Float(63, 48, 400, 300);
		g2d.setPaint(Color.GRAY);
		g2d.fill(drawArea);
		
		// 填充图表绘图区域背景
		g2d.setPaint(Color.WHITE);
		drawArea = new Rectangle2D.Float(60, 45, 400, 300);
		g2d.fill(drawArea);
		
		// 描绘图表绘图区域的轮廓
		g2d.setPaint(Color.BLACK);
		g2d.draw(drawArea);
		
		// 绘制图表标题
		String chartTitle = "2007年上半年计算机类图书销售统计图";
		g2d.setFont(new Font("华文隶书", Font.PLAIN, 25));
		int stringLength = g2d.getFontMetrics().stringWidth(chartTitle);
		g2d.setColor(Color.WHITE);
		g2d.drawString(chartTitle, (width-stringLength)/2, 25);
		
		// 创建虚线笔划
		float[] dashes = {3.f};
		bs = new BasicStroke(1.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND, 10, dashes, 0);
		g2d.setStroke(bs);
		
		String str = "";
		stringLength = 0;
		g2d.setPaint(Color.BLACK);
		g2d.setFont(new Font("宋体", Font.PLAIN, 12));
		int mLength = month.length;
		int mCell = 400/(mLength+1);//每个月之间的间距
		for (int i = 1; i <= mLength; i++) {
		  // 绘制垂直方向虚线
		  g2d.drawLine(60+i * mCell, 45, 60+i * mCell, 345);
		
		  // 绘制横轴上月份的说明文字
		  str += i + "月";
		  stringLength = g2d.getFontMetrics().stringWidth(str);
		  g2d.drawString(str, 60+i*mCell-stringLength/2, 360);
		  
		  // 重置月份说明文字
		  str = "";
		}
		
		g2d.setFont(new Font("Arial", Font.BOLD, 14));
		str = "";
		
		for (int i = 0; i <= 300; i += 30) {
		  // 绘制水平方向虚线
		  g2d.drawLine(60, 45+i, 460, 45+i);
		
		  // 绘制纵轴上销售量的说明文字
		  str += 100-i/3;
		  stringLength = g2d.getFontMetrics().stringWidth(str);
		  g2d.drawString(str, 55-stringLength, 45+i+5);
		  str = "";
		}
		g2d.setFont(new Font("Courier New", Font.PLAIN, 12));
		g2d.setStroke(new BasicStroke());
		Rectangle2D.Double bar ; 	
		
		for (int i =0; i <month.length; i++) { 
		  // 初始化绘制数据
		  int bookSales = 0;
		  sellQuantity = getData(i+1);
		  for (int j = 0; j < book.length; j++) {
		    bookSales = sellQuantity[j+1]*3;//1 + Math.random() * 295;
		    int x = 60+mCell*(i)+(mCell-30)+j*10;
		    int y = 345 - bookSales ;
		    // 填充直方图阴影
			bar = new Rectangle2D.Double(x+4, y+2, 10, bookSales-2);
			g2d.setPaint(Color.GRAY);
			g2d.fill(bar);
		
			bar = new Rectangle2D.Double(x,y, 10, bookSales);
			GradientPaint drawGP = new GradientPaint(x, y, bookColor[j], x, 345, bookColor[j].brighter(), false);
		    
			// 填充直方图
			g2d.setPaint(drawGP);
			g2d.fill(bar);
		
			// 描绘直方图轮廓
			g2d.setPaint(Color.BLACK);
			g2d.draw(bar);
			if(i==1) {
				// 绘制图例
				g2d.setColor(bookColor[j]);
				g2d.fillRect(418, 50+j * 12, 10, 10);
				g2d.setColor(Color.BLACK);
				g2d.drawString(book[j], 432, 60+j * 12);
			}
		  }
		}
		return image;
	}
}