Example usage for org.jfree.chart ChartPanel getGraphics

Introduction

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

Prototype

@BeanProperty(bound = false)
public Graphics getGraphics() 

Source Link

Document

Returns this component's graphics context, which lets you draw on a component.

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);//ww  w. j a  v a2  s.c om

    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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