CODEWITHSUNDEEP
jfreechart
Zur13
Zur13

Reputation: 382

JFreeChart: crosshair label custom position

Is it possible to place crosshair label in the custom position? I have x and y crosshair. I want that y crosshair label was positioned near the data point (change label offset X coordinate).

The problem is that RectangleAnchor has no such option

Crosshair yCrosshair = new Crosshair(Double.NaN, Color.DARK_GRAY, new BasicStroke(0f));
yCrosshair.setLabelAnchor(RectangleAnchor.CENTER);

And it seems that JFreeChart completely ignores label offset settings:

Crosshair yCrosshair = new Crosshair(Double.NaN, Color.DARK_GRAY, new BasicStroke(0f));
yCrosshair.setLabelXOffset(5);

I have the desired plot coordinates for the label in the mouse listener but I can't find how to apply it to the label position.

Upvotes: 0

Views: 297

Answers (1)

Zur13
Zur13

Reputation: 382

Ok I've solved my problem by using XYPointerAnnotation. 

XYPointerAnnotation pointer = new XYPointerAnnotation( "", 0, 0, 7.0 * Math.PI / 4.0 ); 
pointer.setTipRadius(3.0); 
pointer.setBaseRadius(15.0); 
pointer.setPaint(Color.blue); 
pointer.setTextAnchor(TextAnchor.HALF_ASCENT_LEFT); 
pointer.setBackgroundPaint(new Color(180, 180, 180, 180));

And on mouse move event I've position the annotation to the desired point

mainPlot.removeAnnotation(pointer);
if ( !sY.isNaN() ) {
    pointer.setX(x);
    pointer.setY(sY);
    pointer.setText("POWER: "+ sY);
    mainPlot.addAnnotation(pointer);
}

Upvotes: 0

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