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Clipping region [message #36953]

Fri, 27 July 2012 15:09

bushman
Messages: 134
Registered: February 2009

Experienced Member

AFAIK, Painter::Clip() clips drawing done outside a given region. Is there a way of clipping anything drawn inside the region instead?
Similar to

Painter sw;
...
sw.Circle(x, y, radius).Clip();

, which clips any drawing made outside Circle,
but clipping off anything drawn inside Circle instead?

Tks.

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Re: Clipping region [message #36955 is a reply to message #36953]

Fri, 27 July 2012 16:59

mirek
Messages: 13891
Registered: November 2005

Ultimate Member

kropniczki wrote on Fri, 27 July 2012 09:09

AFAIK, Painter::Clip() clips drawing done outside a given region. Is there a way of clipping anything drawn inside the region instead?
Similar to

Painter sw;
...
sw.Circle(x, y, radius).Clip();

, which clips any drawing made outside Circle,
but clipping off anything drawn inside Circle instead?

Tks.

Well, as you can turn any shape into Clip, it is only a matter of drawing a rectangle with hole Wink

Mirek

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Re: Clipping region [message #36956 is a reply to message #36955]

Sun, 29 July 2012 03:41

bushman
Messages: 134
Registered: February 2009

Experienced Member

Quote:

Well, as you can turn any shape into Clip, it is only a matter of drawing a rectangle with hole

I'm afraid I don't follow you. This probably explains why I haven't figure out yet a way of doing it myself. So, may I ask you, how do I draw a rectangle with a hole and then clip off anything drawn outside the rectangle and inside the hole (=circle?)?

Thank you Mirek!

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Re: Clipping region [message #36957 is a reply to message #36956]

Sun, 29 July 2012 09:48

mirek
Messages: 13891
Registered: November 2005

Ultimate Member

	void Paint(Draw& w) {
		Size sz = GetSize();
		DrawPainter sw(w, GetSize());
		sw.Clear(White());
		sw.Rectangle(-10000, -10000, 20000, 20000)
		  .Circle(300, 100, 95)
		  .EvenOdd().Clip();
		sw.DrawText(0, 0, "XXXXXXXXXX", Arial(300));
	}

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Re: Clipping region [message #36959 is a reply to message #36957]

Mon, 30 July 2012 01:27

bushman
Messages: 134
Registered: February 2009

Experienced Member

I'd done it basically just like you suggest, except that I never thought of including the EvenOdd() call in the code, since I honestly do not know what it does yet. Anyway, the code surely works now, which is great!
Ok, great help, thanks!!

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Re: Clipping region [message #36960 is a reply to message #36959]

Mon, 30 July 2012 06:00

mirek
Messages: 13891
Registered: November 2005

Ultimate Member

kropniczki wrote on Sun, 29 July 2012 19:27

I'd done it basically just like you suggest, except that I never thought of including the EvenOdd()

Google for "winding rule".

Mirek

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