Bug 135049

Summary:	Rare drawing bug with XY curves
Product:	[Applications] kst	Reporter:	Nicolas Brisset <nicolas.brisset>
Component:	general	Assignee:	kst
Status:	RESOLVED FIXED
Severity:	normal
Priority:	NOR
Version First Reported In:	1.x
Target Milestone:	---
Platform:	unspecified
OS:	Solaris
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Testcase for bug #135049

Description Nicolas Brisset 2006-10-03 17:46:38 UTC

Version:           1.3.0 (using KDE 3.4.0, compiled sources)
Compiler:          gcc version 3.4.3
OS:                SunOS (sun4u) release 5.8

In some very rare circumstances a drawing bug occurs whereby wrong lines are drawn connecting some far away points, the others being hidden.
I won't bother to describe this better as I have a testcase coming :-)

Note that this is quite rare, I would not rate it as high priority. I hope it's easy to fix, otherwise it can wait (I'd much rather see metadata handled properly than this fixed!). But I thought I'd document it anyway...

Comment 1 Nicolas Brisset 2006-10-03 17:49:21 UTC

Note that if you move the curve in any direction by pressing an arrow key once, it will disappear. This is really a naughty one...

Comment 2 Nicolas Brisset 2006-10-03 17:50:05 UTC

Created attachment 17999 [details]
Testcase for bug #135049

Comment 3 George Staikos 2006-10-06 04:53:32 UTC

SVN commit 592880 by staikos:

if we're going to draw a line segment and jump we'd better flush the polyline
too
BUG: 135049


 M  +4 -0      kstvcurve.cpp  


--- trunk/extragear/graphics/kst/src/libkstmath/kstvcurve.cpp #592879:592880
@@ -1045,6 +1045,10 @@
                     minY = Ly;
                   }
                   if (KDE_ISUNLIKELY(minY >= Ly && minY <= Hy && maxY >= Ly && maxY <= Hy)) {
+                    if (index > 0) {
+                      p->drawPolyline(points, 0, index);
+                      index = 0;
+                    }
                     p->drawLine(X2i, d2i(minY), X2i, d2i(maxY));
                   }
                 }