[GRASS-dev] display/drivers/HTMLMAP status

[Michael Barton]

Glynn,

Is one of these methods a better (or worse) default to use with direct
rendering via the GUI?

Michael


On 2/14/07 8:25 PM, "Glynn Clements" <glynn at gclements.plus.com> wrote:

> 
> Hamish wrote:
> 
>> (no time to run some time trials on your patch yet)
>> 
>>> One thing I have since noticed is that the existing method clips to
>>> the current graphics frame, whereas R_polygon_abs() doesn't (the core
>>> R_* functions only clip to the screen; they don't understand frames).
>>> 
>>> It's possible that was the reason for the current mechanism.
>>> 
>>> In any case, it would be straightforward to add an option to d.vect to
>>> choose between G_plot_polygon(), R_polygon_abs() and the new
>>> D_polygon() and D_polygon_clip() functions for rendering filled
>>> polygons. All of those except for G_plot_polygon would work with the
>>> HTMLMAP driver.
>>> 
>>> So, I intend to add such an option, and to resurrect the HTMLMAP
>>> driver.
>> 
>> Should it be a compile time #ifdef or a module flag? ie if it will be
>> removed later on it might be better to hide it from the user during
>> development. On the otherhand it gets less testing that way. shrug.
> 
> I've added a render= option to d.vect; valid values are:
> 
> g G_plot_polygon (default)
> r R_polygon_abs
> d D_polygon
> c D_polygon_clip
> 
> The descriptions simply says "Rendering method for filled polygons",
> with no explanation. I considered adding "(developer use only)", but
> figured that will only encourage people to try it.
> 
> g or c will clip to the current frame, while r and d won't. r, d, and
> c should all work with the HTMLMAP driver (which is now working).
> 
> My earlier patch essentially hard-codes the r behaviour, so that's
> redundant now.
> 
> The relative speed of various options in actual use would be
> interesting, although the actual results will vary substantially
> depending upon the data, the "screen" (window/image) size, the driver,
> etc.

__________________________________________
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