CODEWITHSUNDEEP
javamouseeventjfreechart
Jeff Storey
Jeff Storey

Reputation: 57192

JFreeChart get mouse coordinates

Is there a way in JFreeChart to determine from a ChartMouseEvent that x,y coordinates (in plot space) the mouse is over? I've tried using the domain crosshair value but that seems inaccurate and lags the actual mouse event.

thanks,

Jeff

Upvotes: 9

Views: 7540

Answers (1)

ChssPly76
ChssPly76

Reputation: 100706

Mouse coordinates from getTrigger() are relative to ChartPanel so you need to convert them:

Point2D p = chartPanel.translateScreenToJava2D(mouseChartEvent.getTrigger().getPoint());
Rectangle2D plotArea = chartPanel.getScreenDataArea();
XYPlot plot = (XYPlot) chart.getPlot(); // your plot
double chartX = plot.getDomainAxis().java2DToValue(p.getX(), plotArea, plot.getDomainAxisEdge());
double chartY = plot.getRangeAxis().java2DToValue(p.getY(), plotArea, plot.getRangeAxisEdge());

Upvotes: 17

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