PPMPolarItemRenderer.java

package com.isti.traceview.transformations.ppm;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.geom.GeneralPath;
import java.awt.geom.Rectangle2D;

import org.jfree.chart.plot.PlotRenderingInfo;
import org.jfree.chart.plot.PolarPlot;
import org.jfree.chart.renderer.DefaultPolarItemRenderer;
import org.jfree.data.xy.XYDataset;

class PPMPolarItemRenderer extends DefaultPolarItemRenderer {
	private static final long serialVersionUID = 1L;
	private double rulerTheta = 0.0;

	public void setRulerAngle(double theta) {
		this.rulerTheta = theta;
	}

	public double getRulerAngle() {
		return rulerTheta;
	}

	/**
	 * Plots the data for a given series. Changes default closed polygon
	 * realisation to chain of sections First series is angle mark(2 values),
	 * other is data Add begin mark to data series
	 * 
	 * @param g2
	 *            the drawing surface.
	 * @param dataArea
	 *            the data area.
	 * @param info
	 *            collects plot rendering info.
	 * @param plot
	 *            the plot.
	 * @param dataset
	 *            the dataset.
	 * @param seriesIndex
	 *            the series index.
	 */
	@Override
	public void drawSeries(Graphics2D g2, Rectangle2D dataArea, PlotRenderingInfo info, PolarPlot plot,
			XYDataset dataset, int seriesIndex) {
		GeneralPath gp = new GeneralPath();
		int numPoints = dataset.getItemCount(seriesIndex);
		Point begin = null;
		double maxRadius = 0;
		for (int i = 0; i < numPoints; i++) {
			double theta = dataset.getXValue(seriesIndex, i);
			double radius = dataset.getYValue(seriesIndex, i);
			if (radius > maxRadius) {
				maxRadius = radius;
			}
			@SuppressWarnings("deprecation")
			Point p = plot.translateValueThetaRadiusToJava2D(theta, radius, dataArea);
			if (i == 0) {
				gp.moveTo(new Float(p.getX()), new Float(p.getY()));
				begin = p;
			} else {
				gp.lineTo(new Float(p.getX()), new Float(p.getY()));
			}
		}
		g2.setPaint(lookupSeriesPaint(seriesIndex));
		g2.setStroke(lookupSeriesStroke(seriesIndex));
		g2.draw(gp);
		// Drawing starting mark
		g2.setColor(Color.BLACK);
		g2.drawOval(begin.x - 2, begin.y - 2, 4, 4);
		// Drawing ruler
		g2.setColor(Color.BLUE);
		g2.setStroke(new BasicStroke(2));
		@SuppressWarnings("deprecation")
		Point ruler1 = plot.translateValueThetaRadiusToJava2D(rulerTheta, maxRadius, dataArea);
		@SuppressWarnings("deprecation")
		Point ruler2 = plot.translateValueThetaRadiusToJava2D(rulerTheta + 180, maxRadius, dataArea);
		g2.drawLine(ruler1.x, ruler1.y, ruler2.x, ruler2.y);
	}
}