Hello Uwe, On Fri, Dec 9, 2022 at 10:29 AM <gisfi...@t-online.de> wrote: > > Hello list, > > I have a point feature layer with attributes for a text string (call it > 'label') and the fontsize in map units (which are meters in my case). > > Is there a way in Grass to derive polygons (like boundig boxes) from this > input information which enclose the label string letter when those are used > to label the points? > > For those who know ArcMap: what I mean is exactly what happens when you > export Annotation features as Shapes in ArcCatalog: you get a polygon layer > in which each text string has a polygon hull which fits the height and width, > respectively. > > From a developer, I heard that this can be done d_get_text_box from display > library, which is not exposed to the end user.
Well, it is exposed to the "C language" end user :-) For a local test, I have added these lines (as a simple debug output): git diff display/d.text/ diff --git a/display/d.text/main.c b/display/d.text/main.c index a5fb7fec7..0aab3db8d 100644 --- a/display/d.text/main.c +++ b/display/d.text/main.c @@ -626,10 +626,12 @@ static void draw_text(char *text, double *x, double *y, double size, D_text_rotation(0.0); D_get_text_box(text, &t, &b, &l, &r); + fprintf(stdout, "t: %.2f, b: %.2f, l: %.2f, r: %.2f\n", t, b, l, r); t = D_u_to_d_row(t); b = D_u_to_d_row(b); l = D_u_to_d_col(l); r = D_u_to_d_col(r); + fprintf(stdout, "t: %.2f, b: %.2f, l: %.2f, r: %.2f\n", t, b, l, r); if (rotation != 0.0) D_text_rotation(rotation * 180.0 / M_PI); I guess it would do what you need - tested in North Carolina sample data location: GRASS nc_spm_08_grass7/user1:d.text > g.region raster=zipcodes_elev_avg d.mon wx0 # test 1: font size 4 d.text text="This is a test of d.text" color=yellow bgcolor=gray size=4 t: 228897.44, b: 228500.00, l: 626709.08, r: 634951.64 t: -26.02, b: 0.00, l: 3.39, r: 543.13 # test 2: font size 6 d.text text="This is a test of d.text" color=yellow bgcolor=gray size=6 t: 229096.16, b: 228500.00, l: 626735.00, r: 639098.84 t: -39.04, b: 0.00, l: 5.09, r: 814.69 > Since I am not a programmer, I am looking for help how to use d_get_text_box. > My goal ist o integrate it in a > simple Python script which I already have. This script can import Shapefiles, > do simple GIS processing using > GRASS modules and write the shapes back. The (current) pity is that there is no Python wrapper around the display library in https://github.com/OSGeo/grass/tree/main/python/grass/pygrass https://github.com/OSGeo/grass/tree/main/python/grass/script > Of course, if coding is necessary to accomplish this, I will pay for it. Maybe not a hard task to write this Python access to the C function D_get_text_box() but unfortunately I am lacking time. Hopefully someone else here is willing to pick up the task. Best, Markus > thank you and best regards, Uwe > _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-dev