I did some tinkering around the potential interface for such module: https://github.com/marisn/grass-addons/tree/v_text_bbox/src/vector/v.text.bbox
Uwe, if nobody else has stepped up to help you, poke me after Christmas as I might have some spare evening before the New Years eave to do more fiddling. Māris. trešd., 2022. g. 14. dec., plkst. 22:16 — lietotājs Markus Neteler (<nete...@osgeo.org>) rakstīja: > > 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 _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-dev
