I am desparately in need of your help and advice. Previously I have started a very good round of discussions by enquiring about the Xganim function in native binary WinGRASS. Now I need to focus on getting a simulation model running, with some basic animation. My objective is to make a point/marker to move from one location to another on a path on a street map, i.e. vector animation. I have tried Xganim, d.slide.show and d.mon, none can work! My questions are:
1) Can this be done by updating the attribute table and refreshing native WinGRASS screen?? How??
2) Is there an easy way to do 1)?
3) As a contigency plan, can I install a Cygwin winGRASS and use it along the native WinGRASS that I already have?
I would be grateful if you could give me some pointers on this as I really need your advice.
Many thanks
Best Regards
Casey Wong
_________________________________________________________________
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I am desparately in need of your help and advice. Previously I have
started a very good round of discussions by enquiring about the
Xganim function in native binary WinGRASS. Now I need to focus on
getting a simulation model running, with some basic animation. My
objective is to make a point/marker to move from one location to
another on a path on a street map, i.e. vector animation. I have
tried Xganim, d.slide.show and d.mon, none can work! My questions
are:
1) Can this be done by updating the attribute table and refreshing
native WinGRASS screen?? How??
2) Is there an easy way to do 1)?
The "hardest" part is creating the individual frames. If you can do that
manually and save each to a graphics file*, you can use any number of
graphics encoders to make the animation. (This depends on the number of
frames in your movie of course, for 500 frames it may take a long time You will have to search for an encoder to make the movie, I'm sure
there are many out there for windows. MPEG/AVI movie encoders will
probably take .ppm images, animated GIFs probably require you to convert
individual frames into GIF first.
[*] in the "Map Display" window, click the floppy disk icon "Export
display to a graphics file". Choose the PPM format, name your frames
frame0001.ppm, frame0002.ppm etc.
(there is no save as PNG format??)
3) As a contigency plan, can I install a Cygwin winGRASS and use it
along the native WinGRASS that I already have?
I don't really know, but I'd think so. Try the new 6.2.1 Cygwin
binaries.
The other approach might be to script what we do in the GUI.
Set up direct rendering to PPM files (GRASS environmental variable) so that
output goes to a file rather than to a display monitor. Then use a loop to
import a vector point from an ascii lookup table with xy values (you can use
conditional importing with a query to do this all in GRASS), displaying it
then overwriting it each time.
You could do this in a simple BASH shell script or in a more sophisticated
scripting language like TclTk, Python, Java, etc.
Michael
On 2/11/07 6:45 PM, "Hamish" <hamish_nospam@yahoo.com> wrote:
yuri bay wrote:
I am desparately in need of your help and advice. Previously I have
started a very good round of discussions by enquiring about the
Xganim function in native binary WinGRASS. Now I need to focus on
getting a simulation model running, with some basic animation. My
objective is to make a point/marker to move from one location to
another on a path on a street map, i.e. vector animation. I have
tried Xganim, d.slide.show and d.mon, none can work! My questions
are:
1) Can this be done by updating the attribute table and refreshing
native WinGRASS screen?? How??
2) Is there an easy way to do 1)?
The "hardest" part is creating the individual frames. If you can do that
manually and save each to a graphics file*, you can use any number of
graphics encoders to make the animation. (This depends on the number of
frames in your movie of course, for 500 frames it may take a long time You will have to search for an encoder to make the movie, I'm sure
there are many out there for windows. MPEG/AVI movie encoders will
probably take .ppm images, animated GIFs probably require you to convert
individual frames into GIF first.
[*] in the "Map Display" window, click the floppy disk icon "Export
display to a graphics file". Choose the PPM format, name your frames
frame0001.ppm, frame0002.ppm etc.
(there is no save as PNG format??)
3) As a contigency plan, can I install a Cygwin winGRASS and use it
along the native WinGRASS that I already have?
I don't really know, but I'd think so. Try the new 6.2.1 Cygwin
binaries.
Hamish
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University
You will have to search for an encoder to make the movie, I'm sure