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OrbWorks Community Forum • View topic - Bug in Lines

Bug in Lines

A PocketC native palm library offering native forms and assorted utilities

Postby pajdoun on Wed Feb 12, 2003 7:25 am

<b>I have problem, with function Lines (small bug in Pocket Toolbox lib.)</b>

<i>//bug.c
library "PToolboxLib"
main(){
int xx[10];

SetDepth(4);
graph_on();
SetFore(15);

xx[0]=100;
xx[1]=100;
xx[2]=-82;
xx[3]=110;
Lines(1+65536*6,&xx,4);

SetFore(10);
xx[0]=100;
xx[1]=80;
xx[2]=-2782;
xx[3]=110;
Lines(1+65536*6,&xx,4);

waitp();

}</i>

can you help me Joseph ?

Thanks

PAjDA
ICQ 135156513
pajda@pajda.com
pajdoun
 
Posts: 8
Joined: Fri Mar 22, 2002 5:22 am
Location: Czech Republic

Postby jstadolnik on Wed Feb 12, 2003 12:25 pm

An array is already a "pointer". By doing &xx, you are providing Lines() with a "pointer to an array" which will result in unexpected behavior... remove the &'s.

Lines(1+65536*6,xx,4);

Alternatively, you can do:

Lines(1+65536*6,&xx[0],4);

Where &xx[0] is a pointer to the first array element.

Joe

The PToolboxLib guy.
http://www.geocities.com/retro_01775/PToolboxLib.htm
jstadolnik
 
Posts: 1741
Joined: Wed Dec 06, 2000 3:34 am
Location: USA

Postby pajdoun on Wed Feb 12, 2003 1:16 pm

I removed & and problem is not clean. The lines is interrupted with regulary space. Why ?

Thanks

PAjDA
ICQ 135156513
pajda@pajda.com
pajdoun
 
Posts: 8
Joined: Fri Mar 22, 2002 5:22 am
Location: Czech Republic

Postby jstadolnik on Wed Feb 12, 2003 2:06 pm

Ok, there is a bug (or rather limitation) here. Basically, the limitation is that the algorithm I use to draw thick lines falls apart when the points well outside the screen are specified.

I'm using 16 bit integers to do some calculations, and an overflow occurs when the X and Y deltas of a line get too large.

I'll fix this, but for now just make sure the your points don't go below -256 and greater than +256 for thick line drawing.

Joe

The PToolboxLib guy.
http://www.geocities.com/retro_01775/PToolboxLib.htm
jstadolnik
 
Posts: 1741
Joined: Wed Dec 06, 2000 3:34 am
Location: USA

Postby pajdoun on Tue Feb 25, 2003 5:32 am

some news in this bug ?

PAjDA
pajdoun
 
Posts: 8
Joined: Fri Mar 22, 2002 5:22 am
Location: Czech Republic

Postby jstadolnik on Tue Feb 25, 2003 1:22 pm

I've already fixed the issue, but I haven't released a version of the library with the patch yet.

Joe

The PToolboxLib guy.
http://www.geocities.com/retro_01775/PToolboxLib.htm
jstadolnik
 
Posts: 1741
Joined: Wed Dec 06, 2000 3:34 am
Location: USA


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