其實帶刻度的蜘蛛圖網上也有不少資料,我這個也是參照別人的資料來做的,不管咋樣,還是記上吧。
先上圖
1、構造dataset
private DefaultCategoryDataset createDataSet2(Map<String, Map<String, Object>> resultMap, List<String> dimNameList) {
DefaultCategoryDataset dataset = new DefaultCategoryDataset();//創建默認的種類數據類型就可以了,蜘蛛圖的每個維度可以看成一種類型
Set<String> keySet = resultMap.keySet();
for(String key : keySet){
Map<String,Object> infoMap = resultMap.get(key);
String vendorCode = key.split("&")[0];
String vendorName = key.split("&")[1];
for(String dimName : dimNameList){
if(infoMap.get(dimName)==null){
continue;
}
double score = (Double) infoMap.get(dimName);
dataset.addValue(score, vendorName.trim() +"("+vendorCode.trim()+")", dimName);
}
}
return dataset;
}
2、因爲jfreechart默認的蜘蛛圖內容區域對象是不帶刻度的,所以我們擴展一個好了,寫一個擴展類繼承SpiderWebPlot,主要是重寫drawLabel方法,這個網上很多地方都有。
public class SpiderWebPlotExpand extends SpiderWebPlot{
private static final long serialVersionUID = 4005814203754627127L;
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 = 10;
private static final double THRESHOLD = 15;
public SpiderWebPlotExpand(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 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);
}
}
}
3、創建chart
private JFreeChart createChart2(DefaultCategoryDataset dataSet) {
SpiderWebPlotExpand plot = new SpiderWebPlotExpand(dataSet);
JFreeChart chart = new JFreeChart("維度得分分析", plot); return chart;
}
這次就比較簡單了,因爲網上例子不少,記在這裏只是給自己以後查找方便,哈