Example usage for org.jfree.chart.plot CrosshairState updateCrosshairPoint

Introduction

In this page you can find the example usage for org.jfree.chart.plot CrosshairState updateCrosshairPoint.

Prototype

public void updateCrosshairPoint(double x, double y, double transX, double transY,
        PlotOrientation orientation) 

Source Link

Document

Evaluates a data point and if it is the closest to the anchor point it becomes the new crosshair point.

Usage

From source file:ucar.unidata.idv.control.chart.MyScatterPlot.java

/**
 * Draws the fast scatter plot on a Java 2D graphics device (such as the
 * screen or a printer).//ww  w.  j a  va2  s . c om
 * a
 * @param g2  the graphics device.
 * @param dataArea the data area
 * @param index which data set
 * @param info  collects chart drawing information (<code>null</code>
 *              permitted).
 * @param crosshairState crosshairState
 *
 * @return did something
 */
public boolean render(Graphics2D g2, Rectangle2D dataArea, int index, PlotRenderingInfo info,
        CrosshairState crosshairState) {

    if (index >= series.size()) {
        return false;
    }
    XYDataset dataset = getDataset(index);
    g2.setStroke(new BasicStroke());
    //                   getRendererForDataset(dataset).getSeriesStroke(0));
    ScatterPlotChartWrapper.MyRenderer renderer = (ScatterPlotChartWrapper.MyRenderer) getRendererForDataset(
            dataset);
    g2.setPaint(renderer.getSeriesPaint(0));
    int shape = renderer.shape;

    PlotOrientation orientation = getOrientation();
    int seenCnt = 0;

    int xx = (int) dataArea.getMinX();
    int ww = (int) dataArea.getWidth();
    int yy = (int) dataArea.getMaxY();
    int hh = (int) dataArea.getHeight();
    ValueAxis rangeAxis = getRangeAxisForDataset(index);
    ValueAxis domainAxis = getDomainAxisForDataset(index);
    double domainMin = domainAxis.getLowerBound();
    double domainLength = domainAxis.getUpperBound() - domainMin;
    double rangeMin = rangeAxis.getLowerBound();
    double rangeLength = rangeAxis.getUpperBound() - rangeMin;
    int boxWidth = 6;

    double[][] data = (double[][]) series.get(index);

    double[] d1 = data[0];
    double[] d2 = data[1];
    int size = d1.length;

    Hashtable seen = new Hashtable();
    int lastX = 0;
    int lastY = 0;
    //TODO: Check for clipping
    //TODO: Try to create a GeneralPath with the points
    //and cal g2.draw just once
    GeneralPath path = new GeneralPath();
    long t1 = System.currentTimeMillis();

    for (int i = 0; i < size; i++) {
        int transX = (int) (xx + ww * (d1[i] - domainMin) / domainLength);
        int transY = (int) (yy - hh * (d2[i] - rangeMin) / rangeLength);
        Object key = transX + "_" + transY;
        if (seen.get(key) != null) {
            seenCnt++;
            continue;
        }
        seen.put(key, key);
        if (crosshairState != null) {
            crosshairState.updateCrosshairPoint(d1[i], d2[i], transX, transY, orientation);
        }

        switch (shape) {

        case LineState.SHAPE_VLINE:
            if (i > 1) {
                g2.drawLine(lastX, lastY, transX, transY);
            }
            lastX = transX;
            lastY = transY;

        case LineState.SHAPE_POINT:
            path.append(new Rectangle((int) transX, (int) transY, 1, 1), false);
            break;

        case LineState.SHAPE_LARGEPOINT:
            path.append(new Rectangle((int) transX, (int) transY, 2, 2), false);
            break;

        case LineState.SHAPE_RECTANGLE:
            path.append(
                    new Rectangle((int) transX - boxWidth / 2, (int) transY - boxWidth / 2, boxWidth, boxWidth),
                    false);
            break;

        case LineState.SHAPE_X:
            g2.drawLine(transX - boxWidth / 2, transY - boxWidth / 2, transX + boxWidth - boxWidth / 2,
                    transY + boxWidth - boxWidth / 2);
            g2.drawLine(transX + boxWidth - boxWidth / 2, transY - boxWidth / 2, transX - boxWidth / 2,
                    transY + boxWidth - boxWidth / 2);
            break;

        case LineState.SHAPE_PLUS:
            g2.drawLine(transX + boxWidth / 2, transY, transX + boxWidth / 2, transY + boxWidth);
            g2.drawLine(transX, transY + boxWidth / 2, transX + boxWidth, transY + boxWidth / 2);
            break;

        }
    }
    g2.fill(path);
    long t2 = System.currentTimeMillis();
    //        System.out.println ("time:" + (t2-t1));
    return true;
}

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