JFreeChart 生成雷达图（急急！！）
环境：jdk1.4
jfreechart-1[1].0.11-demo.jar、jcommon-1[1].0.14.jar
代码：
package com.struts.dao;
import java.io.*;
import javax.swing.JFrame;
import javax.swing.JPanel;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.LegendTitle;
import org.jfree.chart.TextTitle;
import org.jfree.data.DefaultCategoryDataset;
/**
* @author Administrator
*
* To change the template for this generated type comment go to
* Window>Preferences>Java>Code Generation>Code and Comments
*/
public class CreateJFreeChartLDImage{
public static void main(String args[]) {
//在SWING中显示
JFrame jf = new JFrame();
jf.add(erstelleSpinnenDiagramm());
jf.pack();
jf.setVisible(true);
//将JFreeChart保存为图片存在文件路径中
saveAsFile("C:/MySpiderWebPlot.png",500,400);
}
public static JPanel erstelleSpinnenDiagramm() {
JFreeChart jfreechart = createChart();
ChartPanel chartpanel = new ChartPanel(jfreechart);
return chartpanel;
}
public static void saveAsFile(String outputPath,
int weight, int height) {
FileOutputStream out = null;
try {
File outFile = new File(outputPath);
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
out = new FileOutputStream(outputPath);
// 保存为PNG
ChartUtilities.writeChartAsPNG(out, createChart(),weight, height);
// 保存为JPEG
// ChartUtilities.writeChartAsJPEG(out, chart, 500, 400);
out.flush();
}catch (FileNotFoundException e){
e.printStackTrace();
}catch (IOException e){
e.printStackTrace();
}finally{
if(out != null){
try {
out.close();
}catch (IOException e){
// do nothing
}
}
}
}
public static JFreeChart createChart() {
MySpiderWebPlot spiderwebplot = new MySpiderWebPlot(createDataset());
JFreeChart jfreechart = new JFreeChart("前三个季度水果销售报告", TextTitle.DEFAULT_FONT,spiderwebplot, false);
LegendTitle legendtitle = new LegendTitle(spiderwebplot);
legendtitle.setPosition(1);
jfreechart.addSubtitle(legendtitle);
return jfreechart;
}
public static DefaultCategoryDataset createDataset() {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();
String group1 = "苹果 ";
dataset.addValue(5, group1, "一月份");
dataset.addValue(6, group1, "二月份");
dataset.addValue(4, group1, "三月份");
dataset.addValue(2, group1, "四月份");
dataset.addValue(5, group1, "五月份");
dataset.addValue(5, group1, "六月份");
dataset.addValue(5, group1, "七月份");
dataset.addValue(8, group1, "八月份");
String group2 = "橙子";
dataset.addValue(3, group2, "一月份");
dataset.addValue(3, group2, "二月份");
dataset.addValue(4, group2, "三月份");
dataset.addValue(7, group2, "四月份");
dataset.addValue(4, group2, "五月份");
dataset.addValue(5, group2, "六月份");
dataset.addValue(3, group2, "七月份");
dataset.addValue(3, group2, "八月份");
String group3 = "香蕉";
dataset.addValue(4, group3, "一月份");
dataset.addValue(5, group3, "二月份");
dataset.addValue(2, group3, "三月份");
dataset.addValue(5, group3, "四月份");
dataset.addValue(6, group3, "五月份");
dataset.addValue(6, group3, "六月份");
dataset.addValue(4, group3, "七月份");
dataset.addValue(4, group3, "八月份");
return dataset;
} [align=left][/align]
问题：
MySpiderWebPlot spiderwebplot = new MySpiderWebPlot(createDataset());
报错，无法调用MySpiderWebPlot ，为什么？
[解决办法]
MySpiderWebPlot？
你自己定义的plot吗
有没有满足Plot的规范 父类、接口什么的
[解决办法]
.....你的代码明显没有贴全，正好我也研究雷达图，给出MySpiderWebPlot.java
public class MySpiderWebPlot extends SpiderWebPlot {
private int ticks = DEFAULT_TICKS;
private static final int DEFAULT_TICKS = 5;
private NumberFormat format = NumberFormat.getInstance();
private static final double PERPENDICULAR = 90;
private static final double TICK_SCALE = 0.015;
private int valueLabelGap = DEFAULT_GAP;
private static final int DEFAULT_GAP = 20;
private static final double THRESHOLD = 15;
MySpiderWebPlot(CategoryDataset createCategoryDataset) {
super(createCategoryDataset);
}
@Override
protected void drawLabel(final Graphics2D g2, final Rectangle2D plotArea,
final double value, final int cat, final double startAngle,
final double extent) {
super.drawLabel(g2, plotArea, value, cat, startAngle, extent);
final FontRenderContext frc = g2.getFontRenderContext();
final double[] transformed = new double[2];
final double[] transformer = new double[2];
final Arc2D arc1 = new Arc2D.Double(plotArea, startAngle, 0, Arc2D.OPEN);
for (int i = 1; i <= ticks; i++) {
final Point2D point1 = arc1.getEndPoint();
final double deltaX = plotArea.getCenterX();
final double deltaY = plotArea.getCenterY();
double labelX = point1.getX() - deltaX;
double labelY = point1.getY() - deltaY;
final double scale = ((double) i / (double) ticks);
final AffineTransform tx = AffineTransform.getScaleInstance(scale,
scale);
final AffineTransform pointTrans = AffineTransform
.getScaleInstance(scale + TICK_SCALE, scale + TICK_SCALE);
transformer[0] = labelX;
transformer[1] = labelY;
pointTrans.transform(transformer, 0, transformed, 0, 1);
final double pointX = transformed[0] + deltaX;
final double pointY = transformed[1] + deltaY;
tx.transform(transformer, 0, transformed, 0, 1);
labelX = transformed[0] + deltaX;
labelY = transformed[1] + deltaY;
double rotated = (PERPENDICULAR);
AffineTransform rotateTrans = AffineTransform.getRotateInstance(
Math.toRadians(rotated), labelX, labelY);
transformer[0] = pointX;
transformer[1] = pointY;
rotateTrans.transform(transformer, 0, transformed, 0, 1);
final double x1 = transformed[0];
final double y1 = transformed[1];
rotated = (-PERPENDICULAR);
rotateTrans = AffineTransform.getRotateInstance(
Math.toRadians(rotated), labelX, labelY);
rotateTrans.transform(transformer, 0, transformed, 0, 1);
final Composite saveComposite = g2.getComposite();
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
1.0f));
g2.draw(new Line2D.Double(transformed[0], transformed[1], x1, y1));
if (startAngle == this.getStartAngle()) {
final String label = format
.format(((double) i / (double) ticks)
* this.getMaxValue());
final Rectangle2D labelBounds = getLabelFont().getStringBounds(
label, frc);
final LineMetrics lm = getLabelFont()
.getLineMetrics(label, frc);
final double ascent = lm.getAscent();
if (Math.abs(labelX - plotArea.getCenterX()) < THRESHOLD) {
labelX += valueLabelGap;
labelY += ascent / (float) 2;
} else if (Math.abs(labelY - plotArea.getCenterY()) < THRESHOLD) {
labelY += valueLabelGap;
} else if (labelX >= plotArea.getCenterX()) {
if (labelY < plotArea.getCenterY()) {
labelX += valueLabelGap;
labelY += valueLabelGap;
} else {
labelX -= valueLabelGap;
labelY += valueLabelGap;
}
} else {
if (labelY > plotArea.getCenterY()) {
labelX -= valueLabelGap;
labelY -= valueLabelGap;
} else {
labelX += valueLabelGap;
labelY -= valueLabelGap;
}
}
g2.setPaint(getLabelPaint());
g2.setFont(getLabelFont());
g2.drawString(label, (float) labelX, (float) labelY);
}
g2.setComposite(saveComposite);
}
}
}
