Re: drawing a generated bitmap

[David Nečas (Yeti) <yeti physics muni cz>]

On Thu, Jun 15, 2006 at 10:59:50PM +0000, kamil stachowski wrote:
> i understand this is a basic question and am sorry for my ignorance. i really 
> haven't managed to find an answer though i've searched quite a time.
> 
> i've actually got two problems (using nemerle (mono, i.e. gtk#)):
> 
> 1. i'd like to generate a terrain heightmap and draw it onto a widget. should 
> i be using drawingarea.gdkwindow.drawpixel (how to handle colours, then?), 
> try to convert it to an xpm (how?) or what other method would be most 
> appropriate? (please, read the second question before answering this one)

Don't draw pixel by pixel, it would be awfully slow.
Use GdkPixbufs and gdk_draw_pixbuf().

> 2. i'd like to be able to fluently change the colours while the heightmap is 
> already generated. in the old days (i haven't written much for quite a time) 
> it was possible to just draw a bitmap onto the screen and keep redefining the 
> colours, which was pretty fast and looked nice in its way. is it still 
> doable?

Something along these lines should be doable *if* you can
get a indexed color visual, which you cannot count on.  So
I would just redraw it (incidentally I develop a program
which uses false-color maps a lot and redrawing works good
enough).

Yeti


--
Anonyms eat their boogers.