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| Title: | DECWINDOWS 26-JAN-89 to 29-NOV-90 |
| Notice: | See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit |
| Moderator: | STAR::VATNE |
|
| Created: | Mon Oct 30 1989 |
| Last Modified: | Mon Dec 31 1990 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3726 |
| Total number of notes: | 19516 |
1846.0. "XSetDashes pattern gets run together" by CSC32::HADDOCK (The Seventh Son) Tue Dec 05 1989 12:49
I have a customer who requires a XSetDashes set a dash pattern to
1,1,1,1,1,1 (on-of per pixel). The problem is that for lines drawn
at an angle of about 40 to 50 degrees the pattern gets run together
and has different patters such as 1,1,1,10,1,10,1 for example.
The pattern changes depending on the angle. I think I can rule
out hardware since the customer says that he is converting this
application from vws and it works fine with this same on-off pattern
on vws.
Can anyone shed any light on this? I have code that will reproduce
the problem if necessary. I have also tested the code on VMS T5.3
with the same results.
fred();
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1846.1 | more information | CSC32::HADDOCK | The Seventh Son | Tue Dec 05 1989 15:12 | 4 |
| I've done some more testing. The problem occurs if the line
witdth (XSetLineAttributes) is set to 1. Problem does not appear
to occur if line width is 0.
fred();
|
| 1846.2 | Ah yes, buggy wide line code... | CRLMAX::jg | Jim Gettys, Cambridge Research Lab | Tue Dec 05 1989 16:14 | 11 |
| The implementation of dashed wide lines in most people's X servers is
quite buggy.
MIT X11R4 (not yet available from MIT) fixes these problems.
You should QAR the problem to make sure it gets fixed in a future DECwindows
release. Make sure you do it for all of our platforms; I suspect the bug
is universal.
The new MIT R4 code is very much faster, as well...
- Jim
|