Mail Archives: djgpp/1994/01/13/11:17:54
From djgpp-bounces AT sun DOT soe DOT clarkson DOT edu Wed Jan 12 18:29:19 1994
To: djgpp AT sun DOT soe DOT clarkson DOT edu
Subject: Bug in LIBGRX103 ?
I found a problem with libgrx.a
The function GrFilledPolygon shows a strange behavior.
I expected the following program to draw a horizontal line.
#include <grx.h>
#include <stdio.h>
void main()
{
int p[2][2]={{300,200},{310,200}};
GrSetMode(GR_default_graphics);
GrFilledPolygon(2,p,GrWhite());
getchar();
GrSetMode(GR_default_text);
}
The result is something like this:
\
\
If i give GrFilledPolygon 3 points (2 identical) it works fine:
void main()
{
int p[3][2]={{300,200},{300,200},{310,200}};
GrSetMode(GR_default_graphics);
GrFilledPolygon(3,p,GrWhite());
getchar();
GrSetMode(GR_default_text);
}
Thanks for the report. The following diff
(to ...contrib\libgrx\src\scancnvx.c) fixes the problem:
-----------------------------------------------------------
*** scancnvx.old Thu Jan 13 09:09:44 1994
--- scancnvx.c Thu Jan 13 09:08:14 1994
***************
*** 50,56 ****
}
else {
rdx = pt[1][0];
! rdy = pt[1][0];
MOUSE_BLOCK(CURC,ldx,ldy,rdx,rdy);
(*borderproc)(ldx,ldy,rdx,rdy,fillarg);
}
--- 50,56 ----
}
else {
rdx = pt[1][0];
! rdy = pt[1][1];
MOUSE_BLOCK(CURC,ldx,ldy,rdx,rdy);
(*borderproc)(ldx,ldy,rdx,rdy,fillarg);
}
-----------------------------------------------------------
For those who don't want to rebuild libgrx.a the following
.ZIP file contains the necessary patches both to the source
and to the library itself. Instructions:
1) uudecode the attached .ZIP file.
2) unzip it in the GRX base directory. (For example:
\djgpp\contrib\libgrx) If you use pkunzip, don't
forget the '-d' switch!
3) CD to the newly created .\TMP sub-directory.
4) Type:
DO_PATCH
at the DOS prompt. This will overwrite "scancnvx.c"
in the ..\SRC sub-directory and replace the "scancnvx.o"
module in ..\LIB\LIBGRX.A
5) You may now remove the contents of the TMP sub-directory
if you wish.
NOTE: the above procedure assumes that the GRX directory tree
is the same as in the distribution. If you modified it,
change the steps in DO_PATCH.BAT appropriately!
----------------------------------------------------------------------
begin 666 grxpatch.zip
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`
end
Csaba Biegl
csaba AT vuse DOT vanderbilt DOT edu
- Raw text -