Check if point belongs to the plot

Question

I'm using JFreeChart to draw XYPlot. What I'm currently trying to do:

User clicks on the plot and the app gives him back the coordinates of the chosen point; I think that I've got it right. Here is some code:

    public void chartMouseClicked(ChartMouseEvent arg0) {
           Rectangle2D plotArea = chPanel.getScreenDataArea();
           XYPlot plot = (XYPlot) chart.getPlot();
           double chartX = plot.getDomainAxis().java2DToValue(arg0.getTrigger().getPoint().getX(), plotArea, plot.getDomainAxisEdge());
           double chartY = plot.getRangeAxis().java2DToValue(arg0.getTrigger().getPoint().getY(), plotArea, plot.getRangeAxisEdge());
           JOptionPane.showMessageDialog(null, "   x: "+chartX+ "  y: "+chartY);}

I need to determine if user clicked on the line or not. The target is to mark the clicked spot if it is on the drawn graph.

I would be grateful for any clue.

score 1 · Accepted Answer · edited May 23 '17 at 12:27

1

Instead of working with coordinates, add a ChartMouseListener as shown here. You can examine the ChartMouseEvent and any corresponding ChartEntity for a variety of details.

edited May 23 '17 at 12:27

Community

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answered Apr 14 '12 at 19:07

trashgod

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As I understand this works for BarChart, selecting entire Bar. I need to select choosen point on XY Chart, so I'm not sure if I can use it. Correct me if i'm wrong. – Jandrejc Apr 14 '12 at 19:24

score 0 · Answer 2 · answered Sep 27 '12 at 01:50

0

ShapeUtilities.intersects(java.awt.geom.Rectangle2D rect1, java.awt.geom.Rectangle2D rect2)

where rect2 can be "0" rectangle (for your points).

answered Sep 27 '12 at 01:50

Alex

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Check if point belongs to the plot

2 Answers2

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