| From: | |
| Date: | 19 Feb 2001 at 02:54:35 |
| Subject: | Re: Again clipping graphics output |
Czesc Serge!
Dnia 19-Lut-01, Serge Tumanyan napisa�:
>Could you describe this more precisely? The most interesting is
>the fact that, according to my user bug reports, this began to
>happen as soon as I began to use layers library.
And that is why I asked you for working part of source... ;) Without it I
cannot check if you implemented layers correctly...
>AO>>>> The problem in this case is, that I do not know, and can't
>AO>>>> calculate the size of future graphics.
>AO> hmm... I'm quite sceptical here ;-)
>The user draws vector graphics, and can move it on his will. Any
>scepticism left?
Partially... ;) You can "remove" all lines, curves, rectangles, ellipses, text
which are fully invisible and then you'll have a lot less graphics to
render... Things like lines etc. could be easily clipped... For example, if
you must render line from x0,y0 to x1,y1 you could do:
if( ( ( x0 < 0 ) && ( x1 < 0 ) ) || ( ( y0 < 0 ) && ( y1 < 0 ) ) || ( ( x0 >=
width ) && ( x1 >= width ) ) || ( ( y0 >= height ) && ( y1 >= height ) ) )
// line is invisible. don't render.
else if( ( x0 >= 0 ) && ( y0 >= 0 ) && ( x0 < width ) && ( y0 < height ) && (
x1 >= 0 ) && ( y1 >= 0 ) && ( x1 < width ) && ( y1 < height ) )
// line is visible. render without clipping.
else
// line is partially visible. we clip it by hand (it's always faster then
layers.library but it'll become a problem if you would like doing things
which you can do using InstallClipRegion()).
Do you know how to clip graphics by hand?
Regards!
Przemyslaw 'SENSEI' Gruchala
code/gfx2d/gfx3d/webmaster
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