Example usage for org.jfree.chart ChartPanel createImage

Introduction

In this page you can find the example usage for org.jfree.chart ChartPanel createImage.

Prototype

public Image createImage(int width, int height) 

Source Link

Document

Creates an off-screen drawable image to be used for double buffering.

Usage

From source file:net.bioclipse.model.ScatterPlotMouseHandler.java

@Override
public void mouseDragged(MouseEvent e) {
    super.mouseDragged(e);

    ChartPanel chartPanel = getChartPanel(e);
    JFreeChart selectedChart = chartPanel.getChart();
    ChartDescriptor cd = ChartUtils.getChartDescriptor(selectedChart);
    int[] indices = cd.getSourceIndices();

    XYPlot plot = (XYPlot) chartPanel.getChart().getPlot();

    //Create double buffer
    Image buffer = chartPanel.createImage(chartPanel.getWidth(), chartPanel.getHeight());
    Graphics bufferGraphics = buffer.getGraphics();
    chartPanel.paint(bufferGraphics);//w w w.j a v a 2s. co m

    if (lastX == 0 && lastY == 0) {
        lastX = e.getX();
        lastY = e.getY();
    }

    drawRect = new Rectangle();
    int x1 = Math.min(Math.min(e.getX(), lastX), startX);
    int y1 = Math.min(Math.min(e.getY(), lastY), startY);
    int x2 = Math.max(Math.max(e.getX(), lastX), startX);
    int y2 = Math.max(Math.max(e.getY(), lastY), startY);

    drawRect.x = x1;
    drawRect.y = y1;
    drawRect.width = x2 - drawRect.x;
    drawRect.height = y2 - drawRect.y;

    //Create a clipping rectangle
    Rectangle clipRect = new Rectangle(drawRect.x - 100, drawRect.y - 100, drawRect.width + 200,
            drawRect.height + 200);

    //Check for selected points
    for (int j = 0; j < plot.getDataset().getItemCount(plot.getDataset().getSeriesCount() - 1); j++) {
        for (int i = 0; i < plot.getDataset().getSeriesCount(); i++) {
            Number xK = plot.getDataset().getX(i, j);
            Number yK = plot.getDataset().getY(i, j);
            Point2D datasetPoint2D = new Point2D.Double(domainValueTo2D(chartPanel, plot, xK.doubleValue()),
                    rangeValueTo2D(chartPanel, plot, yK.doubleValue()));

            if (drawRect.contains(datasetPoint2D)) {
                PlotPointData cp = new PlotPointData(indices[j], cd.getXLabel(), cd.getYLabel());
                boolean pointAdded = mouseDragSelection.addPoint(cp);
                if (pointAdded) {
                    ((ScatterPlotRenderer) plot.getRenderer()).addMarkedPoint(j, i);
                    selectedChart.plotChanged(new PlotChangeEvent(plot));
                }
            } else if (!mouseDragSelection.isEmpty()) {
                PlotPointData cp = new PlotPointData(indices[j], cd.getXLabel(), cd.getYLabel());
                boolean pointRemoved = mouseDragSelection.removePoint(cp);
                if (pointRemoved) {
                    ((ScatterPlotRenderer) plot.getRenderer()).removeMarkedPoint(new Point(j, i));
                    selectedChart.plotChanged(new PlotChangeEvent(plot));
                }
            }
        }
    }

    Iterator<PlotPointData> iterator = currentSelection.iterator();
    while (iterator.hasNext()) {
        PlotPointData next = iterator.next();
        Point dataPoint = next.getDataPoint();
        ((ScatterPlotRenderer) plot.getRenderer()).addMarkedPoint(dataPoint);
    }

    lastX = e.getX();
    lastY = e.getY();

    Graphics graphics = chartPanel.getGraphics();
    graphics.setClip(clipRect);

    //Draw selection rectangle
    bufferGraphics.drawRect(drawRect.x, drawRect.y, drawRect.width, drawRect.height);

    graphics.drawImage(buffer, 0, 0, chartPanel.getWidth(), chartPanel.getHeight(), null);
}

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