[GRASS5] D_color

[Glynn Clements]

Jachym Cepicky wrote:

> How to draw text to GRASS monitor?
> 
> I try this with
> 
> R_color(black);
> R_set_window(t, b, l, r) ;
> D_get_screen_window(&t, &b, &l, &r) ;
> 
> R_text_size(txsiz, txsiz);
> R_move_abs(x0,y0);
> strcpy(buff, "hallo world\n");
> R_text(buff);
> 
> D_add_to_list(G_recreate_command());
> 
> but nothing is showen :-(

It's hard to say what's wrong without seeing the rest of the program.
However, the following simple test program works.

#include <stdio.h>
#include <stdlib.h>
#include <gis.h>
#include <raster.h>
#include <colors.h>

int main(int argc, char **argv)
{
	struct GModule *module;

	G_gisinit(argv[0]);

	module = G_define_module();
	module->description = "Draws text";

	if (argc > 1 && G_parser(argc, argv))
		exit(1);

	if (R_open_driver() != 0)
		G_fatal_error ("No graphics device selected");

	R_standard_color(BLACK);
	R_text_size(12, 12);
	R_move_abs(20, 20);
	R_text("hello, world");

	R_close_driver();

	return 0;
}

-- 
Glynn Clements <glynn at gclements.plus.com>