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java绘制饼图

import="java.awt.*, javax.imageio.*,java.awt.geom.*,java.awt.image.*"%>

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e68a843231313335323631343130323136353331333363366131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();

%>

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