利用 Java 2D 画曲线图

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<%@ page language="java" contentType="image/jpeg;charset=GBK"
 import="java.awt.*, java.awt.image.*, com.sun.image.codec.jpeg.*"%>
<%
 // 在內存中创建图像
 int width  = 600;
 int height = 500;
 BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 绘制图像
 Graphics g = image.getGraphics();
 Graphics2D g2d = (Graphics2D) g;
 // 背景色
 g.setColor(new Color(240, 249, 255));
g.fillRect(0, 0, width, height);
 // 字体颜色
 g.setColor(Color.BLACK);
 g.setFont(new Font("宋体", Font.PLAIN, 22));
 g.drawString("新浪网2007年上半年访问量统计", 15, 25);
 int visit[] = new int[6];
 for (int i = 0; i < visit.length; i++) {
visit[i] = 1 + (int) (Math.random() * 100);
 }
String mongth[] = { "1月", "2月", "3月", "4月", "5月", "6月" };
g.setFont(new Font("宋体", Font.BOLD, 16));
 g.drawString("访问量(单位:万次)", 20, 50);
 g.drawString("月份", 550, 465);
 g.setFont(new Font("SanSSerif", Font.PLAIN, 12));
int visitValue = 0;
 //画横线
 for (int i = 418; i > 0; i -= 38) {
g.setColor(Color.BLACK);
g.drawString("" + visitValue, 36, (i + 27));
g.setColor(Color.LIGHT_GRAY);
g.drawLine(80, (i + 27), 520, (i + 27));
visitValue += 10;
 }
 g.setColor(Color.BLACK);
 g.drawLine(80, 40, 80, 445);
 g.drawLine(80, 445, 550, 445);
 int drawHigh[] = new int[mongth.length];
 int drawwidth[] = new int[mongth.length];
//折点坐标
 for (int i = 0; i < mongth.length; i++) {
drawHigh[i] = 445 - (int) (Math.ceil(visit[i] * 3.8));
drawwidth[i] = 110 + i * 80;
g.drawString(mongth[i], 110 + i * 80, 465);
 }
//g2d.setXORMode(Color.WHITE);
 //折线粗细
 g2d.setStroke(new BasicStroke(3.0f));
 //折线的颜色
 g2d.setPaint(Color.RED);
 //画折线
 g2d.drawPolyline(drawwidth, drawHigh, mongth.length);
 // 产生图像
 g.dispose();
ServletOutputStream sos = response.getOutputStream();
 JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(sos);
 encoder.encode(image);
out.clear();
 out = pageContext.pushBody();
%>

java画曲线图

转自:http://www.cnblogs.com/190196539/archive/2011/12/21/2295358.html

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