[GRASS-dev] Re: gis.m: artifacts renderend

[Michael Barton]

Maciek,

I cannot duplicate your results exactly. However, doing what you describe
locks up gism for me.

Here is what I'm pretty sure is happening.

1. vector added twice (layers 1 & 2)

2. zoom to any region extents: d.vect is run producing PPM files for layers
1 & 2 that are composited using g.pnmcomp.

3. turn off layer 1 and zoom to any new region extents: active layer 2 is
re-rendered, but inactive layer 1 is not re-rendered because it is not
active (THIS is the problem. There was a check for this that apparently has
been lost in very recent changes).

4. make layer 1 active again and attempt to display: Layer 2 is correctly
rendered, but layer 1 is not rerendered. G.pnmcomp attempts to composite
layers 1 and 2, but they have different geometries causing it to hang (on my
system) or incorrectly display layer 1 (on your system).

We need to fix the bug in step 3. Thanks for finding it.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton



> From: Maciek Sieczka <werchowyna at epf.pl>
> Date: Sun, 7 May 2006 19:51:52 +0200
> To: <grass-dev at grass.itc.it>
> Cc: <cedricgrass at shockfamily.net>, <michael.barton at asu.edu>
> Subject: gis.m: artifacts renderend
> 
> Hi,
> 
> I hope you don't hate me. Yet. ;)
> 
> There is a bug in gis.m that zooming, turning off and redisplaying
> layers leads to artifacts:
> 
> 1. add 2 vector layers - both the same vector
> 2. zoom to one of them [1]
> 3. turn off the 2nd one
> 4. zoom in [2]
> 5. turn on the 2nd one
> 6. redraw [3]
> 
> [1] whole_layer.png
> [2] zoom.png
> [3] dna.png
> 
> Maciek