Java: Making an outline of multiple shapes

Question

Say I drew two circles 30 pixels radius and 20 pixels apart. You'd get a cross-over of lines. How can I prevent this crossover?

I've tried looking at various graphics filtering but I haven't found anything suitable.

(This question is not limited to 2 circles)

Answer 1

You can use java.awt.geom.Area class to do the operations. It has add(), intersect(), subtract() methods.

Create one Area (sum of both ovals) and subtract another Area (intersection of both ovals).

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Working code:

int x = 200; int y = 200;
Ellipse2D.Double first = new Ellipse2D.Double(x,y,75,75);
Ellipse2D.Double second = new Ellipse2D.Double(x+25,y,75,75);
Area circles = new Area(first);
circles.add(new Area(second));

graphics2D.draw(circles);