[GRASS-dev] Re: North Arrow updates

[Hamish]

Michael Barton wrote:
> It seems like a good idea to be able to set the text
> size too. Is there a variable/command to do this?

grab the font control from panel_label.tcl


lib/ogsf/gsd_objs.c:
/**************************************************************
 * Function to draw North Arrow takes OpenGL coords and size
 *************************************************************/
int gsd_north_arrow (float *pos2, float len, GLuint fontbase,
        unsigned long arw_clr, unsigned long text_clr) {

So yes, there is C support for setting a dynamic font.


Right now the nviz north arrow and scale text is hardcoded as 18pt
in nviz/src/draw.c:
  FontBase = load_font(TOGL_BITMAP_HELVETICA_18);

but

nviz/src/label.c uses the same thing to set the font from the controls:

    sprintf(font, "%s", argv[2]);
    size = (int) atoi(argv[3]);
..
    /* Print the label */
    FontBase = load_font(font);

which are the second and third arguments passed to Nplace_label
($font and $Nv_(labelFontSize)). So mimic panel_label and then it's just
a quick modification to draw.c to use the variable value instead of the
hardcoded one.



Hamish