pie3d.java

简单的‘基于web的图表生成系统’

package pie;

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.text.*;

public class Pie3D {
	private int[] data;
	private String month;
	private String[] months = new String[]{"一","二","三","四","五","六"};
	
	private BufferedImage createImage() {
		int width = 500, height = 375;
		
		BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		
		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);
		
		//绘制渐进圆角矩形阴影
		GradientPaint grayGP = new GradientPaint(0, 0, Color.GRAY, width, height, new Color(218, 214, 212), false);
		g2d.setPaint(grayGP);
		g2d.fillRoundRect(5, 5, width-5, height-5, 50, 50);
		
		//绘制渐进圆角矩形背景
		GradientPaint yellowGP = new GradientPaint(width, 0, new Color(252, 197, 113), width/2, height/2, new Color(255, 255, 169), true);
		g2d.setPaint(yellowGP);
		g2d.fillRoundRect(0, 0, width-5, height-5, 50, 50);
		
		//绘制圆角矩形轮廓
		BasicStroke bs = new BasicStroke(1.0f);
		g2d.setStroke(bs);
		g2d.setPaint(new Color(55,71, 105));
		g2d.drawRoundRect(0, 0, width-5, height-5, 50, 50);
		g2d.drawRoundRect(390, 47, 95, 65, 15, 15);
		
		//绘制图表标题
		String chartTitle = month + "月份销售统计图";
		g2d.setColor(Color.BLACK);
		g2d.setFont(new Font("宋体", Font.PLAIN, 30));
		int stringLength = g2d.getFontMetrics().stringWidth(chartTitle);
		g2d.drawString(chartTitle, (width-stringLength)/2, 30 );
		
		//定义圆弧
		Arc2D.Double arc2d = new Arc2D.Double();
		double startAngle = 30.0, arcAngle = 0.0;
		double rectWidth = 295.0, rectHeight = 245.0;
		Point2D.Double p2d = new Point2D.Double((width - rectWidth)/2, 70.0);
		int arcType = Arc2D.PIE;
		
		//声明绘制数据
		String bookTitle[] = {"JAVA", ".NET", "C", "PB", "PASCAL"};
		Color color[] = new Color[5];
		color[0] = new Color(99, 99, 0);
		color[1] = new Color(255,169,66);
		color[2] = new Color(33, 255, 66);
		color[3] = new Color(33, 0, 255);
		color[4] = new Color(255, 0, 66);
		
		double bookSales[] = new double[5];
		double totalSales = 0.0;
		double proportion = 0.0;
		for (int i = 0; i< bookSales.length; i++) {
			bookSales[i] = data[i+1];
			totalSales += bookSales[i];
		}
		
		//定义厚度
		int thickness = 25;
		
		//绘制起始角度不大于90度的圆弧
		startAngle = 30;
		for (int i = 0 ; i < bookTitle.length; i++) {
			arcAngle = bookSales[i]*360 / totalSales;
			if (startAngle >= 270)  break;
			for (int j= thickness; j> 0; j--) {
				proportion = bookSales[i]/totalSales * 100 ;
				g2d.setColor( color[i].darker() );
				arc2d = new Arc2D.Double(p2d.x, p2d.y + j, rectWidth, rectHeight, startAngle ,arcAngle, arcType);
				g2d.fill( arc2d) ;
			}
			// 更新圆弧的起始角度
			startAngle += arcAngle;
		}
		
		// 绘制起始角度不小于270度的圆弧
		startAngle = 390;
		for(int i = bookTitle.length -1 ; i >0 ; i--) {
			arcAngle = bookSales[i]*360 / totalSales;
			if (startAngle <= 270 ) break;
			for (int j= thickness; j> 0; j--) {
				proportion = bookSales[i]/totalSales * 100 ;
				g2d.setColor( color[i].darker() );
				arc2d = new Arc2D.Double(p2d.x, p2d.y + j, rectWidth, rectHeight, startAngle, -arcAngle, arcType);
				g2d.fill( arc2d) ;
			}
			//更新圆弧的起始角度
			startAngle -= arcAngle;
		}
		
		//绘制最上面一层圆弧
		startAngle = 30;
		for(int i = 0 ; i < bookTitle.length; i++) {
			arcAngle = bookSales[i]*360 / totalSales;
			proportion = bookSales[i]/totalSales * 100 ;
		
			g2d.setColor(color[i]);
			arc2d = new Arc2D.Double(p2d.x, p2d.y , rectWidth, rectHeight, startAngle, arcAngle, arcType);
			g2d.fill(arc2d) ;
		
			//描绘圆弧轮廓
			g2d.setStroke(new BasicStroke(1.2f));
			g2d.setPaint(Color.GRAY);
			g2d.draw(arc2d);			
		
			// 更新圆弧的起始角度
			startAngle += arcAngle;
			
			// 格式化浮点数的输出格式
			DecimalFormat twoDigits = new DecimalFormat("0.00");
			g2d.setFont(new Font("Courier New", Font.PLAIN, 12));
		
			// 重新关闭反锯齿功能，用于绘制饼图的说明文字
			g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_OFF);
		
			// 绘制说明文字
			drawTips(bookTitle[i] + " " + twoDigits.format(proportion) + "%", Color.BLACK, arc2d, g2d);
		   	
			g2d.setColor(color[i]);
			g2d.fillRect(400, 50+i * 12, 10, 10);
			g2d.setColor(Color.BLACK);
			g2d.drawString(bookTitle[i], 415, 60+i * 12);
			g2d.drawString(String.valueOf(data[i+1]), 460, 60+i * 12);
			
			// 重新打开反锯齿功能
			g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		}
		return image;
	}
	
	private void drawTips(String tips, Color color, Arc2D.Double arc2d, Graphics2D g2d) {
		 Arc2D.Double position = arc2d;

		 position.setAngleExtent(arc2d.getAngleExtent()/2);
		 position.x = arc2d.x - 15;
		 position.y = arc2d.y - 15;
		 position.width = arc2d.getWidth() + 50;
		 position.height = arc2d.getHeight() + 50;
		 Point2D.Double endPoint = (Point2D.Double)position.getEndPoint();

		 g2d.setPaint(color);
		 
		 int stringLength = g2d.getFontMetrics().stringWidth(tips);
		 if (endPoint.x <= arc2d.getCenterX())
			g2d.drawString(tips, (float)endPoint.x-stringLength, (float)endPoint.y);
		 else
			g2d.drawString(tips, (float)endPoint.x, (float)endPoint.y );
	}
	
	public BufferedImage getImage() {
		return createImage();
	}
	
	public void setData(int[] da) {
		data = da;
		if (data[0] == 1) month = months[0];
		else if (data[0] == 2) month = months[1];
		else if (data[0] == 3) month = months[2];
		else if (data[0] == 4) month = months[3];
		else if (data[0] == 5) month = months[4];
		else if (data[0] == 6) month = months[5];
	}
}