Bug 653103 - failure to redraw correctly under certain conditions
Summary: failure to redraw correctly under certain conditions
Alias: None
Product: Fedora
Classification: Fedora
Component: gtk2
Version: 14
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: Matthias Clasen
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2010-11-14 15:28 UTC by James Bridge
Modified: 2012-08-16 19:16 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-08-16 19:16:49 UTC
Type: ---

Attachments (Terms of Use)
small c program which demonstrates the problem (3.55 KB, text/plain)
2010-11-14 15:28 UTC, James Bridge
no flags Details
even shorter test program (1.54 KB, text/plain)
2010-11-17 21:03 UTC, James Bridge
no flags Details
Put the drawing commands in a separate function and it works ok! (2.14 KB, text/plain)
2010-12-11 22:24 UTC, James Bridge
no flags Details

Description James Bridge 2010-11-14 15:28:29 UTC
Created attachment 460374 [details]
small c program which demonstrates the problem

Description of problem:
the attached file demonstrates the problem. (I encountered it while developing a program to do things with the Mandelbrot set.) You should always see a polygonal figure but sometimes areas are filled black

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Compile and run to get an empty window,
2. left-click to get a figure which always draws correctly and  
3. right-click to get one which looks very similar but misbehaves. To see this, try resizing the window, minimizing and maximizing, hiding under another window etc.

Actual results:
polygonal figures, some areas filled. See attached images.

Expected results:
no fill

Additional info:
Changing the constant term 1.4 in the function draw_iter() makes the program behave correctly (for these starting points).

Comment 1 James Bridge 2010-11-17 21:03:46 UTC
Created attachment 461160 [details]
even shorter test program

In this case the coordinates of the points are coded explicitly. I have tried varying the values and in some cases larger variations are possible before the incorrect redraw problem vanishes.

Note that the first line drawn almost but not quite coincides with the last and the second and third lines. If the numbers are made exactly the same, the problem goes away!

Comment 2 James Bridge 2010-12-11 22:24:45 UTC
Created attachment 468174 [details]
Put the drawing commands in a separate function and it works ok!

Comment 3 Fedora End Of Life 2012-08-16 19:16:51 UTC
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