java绘制饼图
<%@ page language="java" contentType="image/png;charset=GBK" pageEncoding="GBK"
import="java.awt.*, javax.imageio.*,java.awt.geom.*,java.awt.image.*"%>
<%!// 绘制饼图的说明
public 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);
}
}
%>
<%
// 清空缓冲区
response.reset();
// 注意这里的MIME类型
response.setContentType("image/png");
// 创建一个 500X375 的图像
int width = 500, height = 375;
BufferedImage image = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 创建Java2D对象
Graphics2D g2d = image.createGraphics();
// 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(252, 197,
113), width / 2, height / 2, new Color(255, 255, 169), true);
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);
// 绘制图表标题
//String chartTitle = "客户构成分析";
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;
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;
// 定义厚度
int thickness = 25;
for (int i = 0; i < bookSales.length; i++) {
bookSales[i] = 1 + Math.random() * 99;
totalSales += bookSales[i];
}
// 绘制起始角度不大于90度的圆弧
startAngle = 30;
for (int i = 0; i < bookSales.length; i++) {
arcAngle = bookSales[i];
if (startAngle >= 90) {
break;
}
for (int j = thickness; j > 0; j--) {
g2d.setColor(color[i].darker());
arc2d = new Arc2D.Double(p2d.x, p2d.y + j, rectWidth,
rectHeight, startAngle, arcAngle, arcType);
// 填充圆弧
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 = bookSales.length - 1; i > 0; i--) {
arcAngle = bookSales[i];
if (startAngle <= 270) {
break;
}
for (int j = thickness; j > 0; j--) {
g2d.setColor(color[i].darker());
arc2d = new Arc2D.Double(p2d.x, p2d.y + j, rectWidth,
rectHeight, startAngle, -arcAngle, arcType);
// 填充圆弧
g2d.fill(arc2d);
}
// 更新圆弧的起始角度
startAngle -= arcAngle;
}
// 绘制起始角度在90度到270度之间的圆弧
startAngle = 30;
for (int i = 0; i < bookSales.length; i++) {
arcAngle = bookSales[i];
if (startAngle > 90 && startAngle < 270) {
for (int j = thickness; j > 0; j--) {
g2d.setColor(color[i].darker());
arc2d = new Arc2D.Double(p2d.x, p2d.y + j, rectWidth,
rectHeight, startAngle + arcAngle, -arcAngle,
arcType);
// 填充圆弧
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 < bookSales.length; i++) {
arcAngle = bookSales[i];//item.getPercent() * 3.6;
g2d.setColor(color[i]);
arc2d = new Arc2D.Double(p2d.x, p2d.y, rectWidth, rectHeight,
startAngle, arcAngle, arcType);
// 填充圆弧
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;
g2d.setFont(new Font("宋体", Font.PLAIN, 12));
}
// 部署图形
g2d.dispose();
// 利用ImageIO类的write方法对图像进行编码
ServletOutputStream sos = response.getOutputStream();
ImageIO.write(image, "PNG", sos);
sos.close();
out.clear();
out = pageContext.pushBody();
%>
