stackedareaxyrenderer.java

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/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * -------------------
 * StackedAreaXYRenderer.java
 * -------------------
 * (C) Copyright 2003 by Richard Atkinson.
 *
 * Original Author:  Richard Atkinson;
 * Contributor(s):   Christian W. Zuckschwerdt;
 *
 * $Id: StackedAreaXYRenderer.java,v 1.3 2003/07/30 15:51:59 mungady Exp $
 *
 * Changes:
 * --------
 * 27-Jul-2003 : Initial version (RA);
 * 30-Jul-2003 : Modified entity constructor (CZ);
 * 
 */

package org.jfree.chart.renderer;

import java.awt.Graphics2D;
import java.awt.Paint;
import java.awt.Point;
import java.awt.Polygon;
import java.awt.Shape;
import java.awt.Stroke;
import java.awt.geom.Rectangle2D;
import java.util.Stack;

import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.CrosshairInfo;
import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.entity.EntityCollection;
import org.jfree.chart.entity.XYItemEntity;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.urls.XYURLGenerator;
import org.jfree.data.XYDataset;

/**
 * A stacked area renderer for the {@link XYPlot} class.
 * 
 * @author Richard Atkinson
 */
public class StackedAreaXYRenderer extends AreaXYRenderer {

    /** Last series points to draw bottom edge of the polygon */
    private Stack lastSeriesPoints = null;

    /** This series points */
    private Stack thisSeriesPoints = null;

    public StackedAreaXYRenderer() {
        this(AREA);
    }
    /**
     * Constructs a new renderer.
     *
     * @param type  the type of the renderer.
     */
    public StackedAreaXYRenderer(int type) {
        this(type, null, null);
    }

    /**
     * Constructs a new renderer.
     * <p>
     * To specify the type of renderer, use one of the constants: SHAPES, LINES,
     * SHAPES_AND_LINES, AREA or AREA_AND_SHAPES.
     *
     * @param type  the type of renderer.
     * @param toolTipGenerator  the tool tip generator to use.  <code>null</code> is none.
     * @param urlGenerator  the URL generator (null permitted).
     */
    public StackedAreaXYRenderer(int type,
                          XYToolTipGenerator toolTipGenerator, XYURLGenerator urlGenerator) {

        super(type, toolTipGenerator, urlGenerator);
    }

    /**
     * Returns the range type.
     *
     * @return the range type.
     */
    public RangeType getRangeType() {
        return RangeType.STACKED;
    }

    /**
     * Draws the visual representation of a single data item.
     *
     * @param g2  the graphics device.
     * @param dataArea  the area within which the data is being drawn.
     * @param info  collects information about the drawing.
     * @param plot  the plot (can be used to obtain standard color information etc).
     * @param domainAxis  the domain axis.
     * @param rangeAxis  the range axis.
     * @param dataset  the dataset.
     * @param series  the series index (zero-based).
     * @param item  the item index (zero-based).
     * @param crosshairInfo  information about crosshairs on a plot.
     * @param pass  the pass index.
     */
    public void drawItem(Graphics2D g2,
                         Rectangle2D dataArea,
                         ChartRenderingInfo info,
                         XYPlot plot,
                         ValueAxis domainAxis,
                         ValueAxis rangeAxis,
                         XYDataset dataset,
                         int series,
                         int item,
                         CrosshairInfo crosshairInfo,
                         int pass) {

//      System.out.println(new java.util.Date() + " drawItem called - " + series + " - " + item + ".");
        // Get the item count for the series, so that we can know which is the end of the series.
        int itemCount = dataset.getItemCount(series);

        Paint paint = getItemPaint(series, item);
        Stroke seriesStroke = getItemStroke(series, item);
        g2.setPaint(paint);
        g2.setStroke(seriesStroke);

        // get the data point...
        Number x1 = dataset.getXValue(series, item);
        Number y1 = dataset.getYValue(series, item);
        double ph1 = this.getPreviousHeight(dataset, series, item);
        double transX1 = domainAxis.translateValueToJava2D(x1.doubleValue(), dataArea,
                                                           plot.getDomainAxisEdge());
        double transY1 = rangeAxis.translateValueToJava2D(y1.doubleValue()+ph1, dataArea,
                                                          plot.getRangeAxisEdge());

        if (item == 0) {
            // Create a new Area for the series
            pArea = new Polygon();
            this.lastSeriesPoints = this.thisSeriesPoints;
            this.thisSeriesPoints = new Stack();

            // start from previous height (ph1)
            double transY2 = rangeAxis.translateValueToJava2D(ph1, dataArea,
                                                              plot.getRangeAxisEdge());

            // The first point is (x, 0)
            if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                pArea.addPoint((int) transX1, (int) transY2);
//              System.out.println("First point [" + (int)transX1 + "," + (int)transY2 + "]");
            } else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                pArea.addPoint((int) transY2, (int) transX1);
            }
        }

        // Add each point to Area (x, y)
        if (plot.getOrientation() == PlotOrientation.VERTICAL) {
            Point point = new Point((int) transX1, (int) transY1);
            pArea.addPoint((int)point.getX(), (int)point.getY());
            this.thisSeriesPoints.push(point);
        }
        else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
            pArea.addPoint((int) transY1, (int) transX1);
        }
        Shape shape = null;
        if (this.getPlotShapes()) {
            shape = getItemShape(series, item);
            if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                shape = createTransformedShape(shape, transX1, transY1);
            }
            else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                shape = createTransformedShape(shape, transY1, transX1);
            }
            g2.draw(shape);
        }
        else {
            if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                shape = new Rectangle2D.Double(transX1 - 3, transY1 - 3, 6.0, 6.0);
            }
            else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                shape = new Rectangle2D.Double(transY1 - 3, transX1 - 3, 6.0, 6.0);
            }
        }

        if (this.getPlotLines()) {
            if (item > 0) {
                // get the previous data point...
                Number x0 = dataset.getXValue(series, item - 1);
                Number y0 = dataset.getYValue(series, item - 1);
                double ph0 = this.getPreviousHeight(dataset, series, item - 1);
                double transX0 = domainAxis.translateValueToJava2D(x0.doubleValue(), dataArea,
                                                                   plot.getDomainAxisEdge());
                double transY0 = rangeAxis.translateValueToJava2D(y0.doubleValue() + ph0, dataArea,
                                                                  plot.getRangeAxisEdge());

                if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                    line.setLine(transX0, transY0, transX1, transY1);
                }
                else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                    line.setLine(transY0, transX0, transY1, transX1);
                }
                g2.draw(line);
            }
        }

        // Check if the item is the last item for the series.
        // and number of items > 0.  We can't draw an area for a single point.
        if (this.getPlotArea() && item > 0 && item == (itemCount - 1)) {

            double transY2 = rangeAxis.translateValueToJava2D(ph1, dataArea,
                                                              plot.getRangeAxisEdge());

            if (plot.getOrientation() == PlotOrientation.VERTICAL) {
                // Add the last point (x,0)
                pArea.addPoint((int) transX1, (int) transY2);
//              System.out.println("Last point [" + (int)transX1 + "," + (int)transY2 + "]");
            }
            else if (plot.getOrientation() == PlotOrientation.HORIZONTAL) {
                // Add the last point (x,0)
                pArea.addPoint((int) transY2, (int) transX1);
            }

            //  Add points from last series to complete the base of the polygon
            if (series != 0) {
                while (!this.lastSeriesPoints.empty()) {
                    Point point = (Point)this.lastSeriesPoints.pop();
                    pArea.addPoint((int)point.getX(), (int)point.getY());
                }
            }

            // fill the polygon
            g2.fill(pArea);

            // draw an outline around the Area.
            if (this.isOutline()) {
                g2.setStroke(plot.getOutlineStroke());
                g2.setPaint(plot.getOutlinePaint());
                g2.draw(pArea);
            }
        }

        // do we need to update the crosshair values?
        if (plot.isDomainCrosshairLockedOnData()) {
            if (plot.isRangeCrosshairLockedOnData()) {
                // both axes
                crosshairInfo.updateCrosshairPoint(x1.doubleValue(), y1.doubleValue());
            }
            else {
                // just the horizontal axis...
                crosshairInfo.updateCrosshairX(x1.doubleValue());

            }
        }
        else {
            if (plot.isRangeCrosshairLockedOnData()) {
                // just the vertical axis...
                crosshairInfo.updateCrosshairY(y1.doubleValue());
            }
        }

        // collect entity and tool tip information...
        if (getInfo() != null) {
            EntityCollection entities = getInfo().getEntityCollection();
            if (entities != null && shape != null) {
                String tip = null;
                if (getToolTipGenerator() != null) {
                    tip = getToolTipGenerator().generateToolTip(dataset, series, item);
                }
                String url = null;
                if (getURLGenerator() != null) {
                    url = getURLGenerator().generateURL(dataset, series, item);
                }
                XYItemEntity entity = new XYItemEntity(shape, dataset, series, item, tip, url);
                entities.addEntity(entity);
            }
        }

    }


    /**
     * Calculates the stacked value of the all series up to, but not including <code>series</code>
     * for the specified category, <code>category</code>.  It returns 0.0 if <code>series</code>
     * is the first series, i.e. 0.
     *
     * @param data  the data.
     * @param series  the series.
     * @param index  the index.
     *
     * @return double returns a cumulative value for all series' values up to
     * but excluding <code>series</code> for <code>index</code>.
     */
    protected double getPreviousHeight(XYDataset data, int series, int index) {

        double result = 0.0;

        Number tmp;
        for (int i = 0; i < series; i++) {
            tmp = data.getYValue(i, index);
            if (tmp != null) {
                result += tmp.doubleValue();
            }
        }

        return result;

    }

}