Hi Gregory,
please see my comments below.
On Fri, Sep 03, 2004 at 09:52:59PM -0400, Gregory Pierce wrote:
> Okay here is the scenario (and I'm hoping there is something in the
> API that permits this because at this point I haven't found anything).
>
> What I have are two RoundRectangle2Ds that have an alpha of 50
> percent. I want to draw a line connecting the centers of both of these
> RoundRectangle2Ds.
>
> A----B
>
> If the RR2Ds were opaque I wouldn't have a problem, I would just draw
> all of the links first and then draw all of the RR2Ds. Piece of cake.
> However since the RR2Ds allow you to see through them, this clearly
> won't work.
>
> I've looked at using Graphics2D.setClip(), but this will only allow me
> to clip the line against one of the shapes. I also looked into solving
> the problem using CAG, but Area doesn't work with lines (though I will
> try to adapt my pathing algorithms to use rectangles if that solves my
> drawing problem (here's hoping).
>
> It would be nice if there was a way to do a Graphics2D.addClip(Shape)
> so that I could clip the graphics region by a near infinite number of
> shapes. Same for intersect() and the like.
I may be missing something, but why can't you construct a clip Area
by subtracting (Area.subtract) the two RR2Ds you have from a rectangular
clip, and set that area as the clip?
Something along the lines of
Area clipA = new Area(new Rectangle2D.Float(0, 0, winWidth, winHeight));
clipA.subtract(new Area(rr2d_1)); // cut out rr2d_1, which is the first RoundRect2D
clipA.subtract(new Area(rr2d_2)); // ... the second ...
g2d.setClip(clipA);
g2d.drawLine(...)
Or take a look at demo/jfc/Java2D/src/java2d/demos/Clipping..
Thanks,
Dmitri
>
> Would be nice to see the OpenGL statemachine style of rendering start
> bubbling up to Java2D. Now that you're accelerating it via OpenGL,
> expect to see a lot of requests :)
>
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