Processing 1.0 _ALPHA_ - stroke and fill not matching

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   Processing 1.0 _ALPHA_
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   stroke and fill not matching

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Topic: stroke and fill not matching (Read 432 times)

Koenie

stroke and fill not matching
« on: Nov 10^th, 2003, 5:41pm »

I got a weird bug, the stroke and the fill of a POLYGON shape are not matching, check out the example.
The white fill and the black stroke are both the same shape. Is this a bug?

example: http://koeniedesign.com/bug/

Koenie

http://koeniedesign.com

flight404

Re: stroke and fill not matching
« Reply #1 on: Nov 10^th, 2003, 10:17pm »

I seem to recall a rumor about Processing having a bug involving the filling of concave shapes. Let me look for the post...

r

I found some mentions of this. Seems like it is a known issue that is nearing being fixed.

http://proce55ing.net/discourse/yabb/board_Proce55ing_software__bugs_action_display_num_1062469819.html

« Last Edit: Nov 10^th, 2003, 10:20pm by flight404 »

fry

Re: stroke and fill not matching
« Reply #2 on: Nov 10^th, 2003, 11:09pm »

yep, from the known bugs list in bugs.txt:

- concave polygons still don't work, meaning that lots of irregular
polygons won't draw properly.
http://proce55ing.net/discourse/yabb/board_Proce55ing_software__bugs_action_display_num_1062469819.html

and the fix is hopefully near.. it's part of the new graphics code that keeps getting delayed.

the workaround for your example is to break the shape into separate pieces.

REAS

Re: stroke and fill not matching
« Reply #3 on: Nov 11^th, 2003, 4:12am »

good work koenie.
that's the best visualization i've seen of this bug.

(it's not really a bug as much as code which hasn't been implemented yet).

Jerronimo

Re: stroke and fill not matching
« Reply #4 on: Nov 11^th, 2003, 2:41pm »

ya know, I don't know if it will help here, but I was working on a paint program a little while ago, and a friend wrote a fast, accurate flood fill algorithm for me that works amazingly well. I can post it here if it will help...

although i can't imagine it helping this problem, really...

I'll throw it into a sketch anyway...

toxi

Re: stroke and fill not matching
« Reply #5 on: Nov 11^th, 2003, 5:47pm »

if you are fine with losing the outline, you can use a TRIANGLE_STRIP for now to avoid the problem:

Code:

void update() {
beginShape(TRIANGLE_STRIP);
for (float i = 0; i <= PI; i +=0.04) {
vertex(30*cos(a+i)+x, 30*sin(a+i)+y);
vertex(70*cos(a+i)+x, 70*sin(a+i)+y);
}
endShape();

a = (a > TWO_PI) ? 0 : a+s;
}

http://toxi.co.uk/

Koenie

Re: stroke and fill not matching
« Reply #6 on: Nov 11^th, 2003, 9:59pm »

toxi, i got that exact same fix for my particular case already. thanks anyway. btw, using triangle_strip looks ugly with smooth(); (in this case)

Koenie

http://koeniedesign.com

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