add sqrt_flag to make symbols proportionate to the square root of size_column (allows to make surface and not height of circles proportionate)

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@41259 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.vect/local_proto.h

@@ -5,7 +5,7 @@ FILE *open_vect(char *, char *);
 int close_vect(FILE *);
 int plot1(struct Map_info *, int, int, struct cat_list *,
 	  const struct color_rgb *, const struct color_rgb *, int, char *,
-	  double, char *, char *, int, int, int, char *, int, char *, double,
+	  double, char *, int, char *, int, int, int, char *, int, char *, double,
 	  int, char *);
 int label(struct Map_info *, int, int, struct cat_list *, LATTR *, int);
 int topo(struct Map_info *, int, int, LATTR *);

display/d.vect/main.c

@@ -98,7 +98,7 @@ int main(int argc, char **argv)
     struct Option *attrcol_opt, *maxreg_opt, *minreg_opt;
     struct Option *width_opt, *wcolumn_opt, *wscale_opt;
     struct Flag *id_flag, *table_acolors_flag, *cats_acolors_flag,
-	*zcol_flag;
+	*zcol_flag, *sqrt_flag;
     struct cat_list *Clist;
     int *cats, ncat;
     LATTR lattr;
@@ -357,6 +357,12 @@ int main(int argc, char **argv)
     zcol_flag->description = _("Colorize polygons according to z height");
     zcol_flag->guisection = _("Colors");
 
+    sqrt_flag = G_define_flag();
+    sqrt_flag->key = 'r';
+    sqrt_flag->label = _("Use square root of the value of size_column");
+    sqrt_flag->description = _("Use this if you want to make the surface instead of the height of circles proportionate to size_column");
+    sqrt_flag->guisection = _("Symbols");
+
     /* Check command line */
     if (G_parser(argc, argv))
 	exit(EXIT_FAILURE);
@@ -637,7 +643,7 @@ int main(int argc, char **argv)
 		stat = plot1(&Map, type, area, Clist,
 			     has_color ? &color : NULL,
 			     has_fcolor ? &fcolor : NULL, chcat, icon_opt->answer,
-			     size, sizecolumn_opt->answer, rotcolumn_opt->answer,
+			     size, sizecolumn_opt->answer, (int)sqrt_flag->answer, rotcolumn_opt->answer,
 			     (int)id_flag->answer, table_acolors_flag->answer,
 			     cats_acolors_flag->answer, rgbcol_opt->answer,
 			     default_width, wcolumn_opt->answer, width_scale,

display/d.vect/plot1.c

@@ -1,6 +1,7 @@
 /* plot1() - Level One vector reading */
 
 #include <string.h>
+#include <math.h>
 #include <grass/gis.h>
 #include <grass/raster.h>
 #include <grass/vector.h>
@@ -41,7 +42,7 @@ struct rgb_color palette[16] = {
 int plot1(struct Map_info *Map, int type, int area, struct cat_list *Clist,
 	  const struct color_rgb *color, const struct color_rgb *fcolor,
 	  int chcat, char *symbol_name, double size, char *size_column,
-	  char *rot_column, int id_flag, int table_colors_flag,
+	  int sqrt_flag, char *rot_column, int id_flag, int table_colors_flag,
 	  int cats_color_flag, char *rgb_column, int default_width,
 	  char *width_column, double width_scale, int z_color_flag,
 	  char *style)
@@ -513,6 +514,9 @@ int plot1(struct Map_info *Map, int type, int area, struct cat_list *Clist,
 		}
 	    }		/* end if nrec_size */
 
+            if (sqrt_flag)
+                var_size = sqrt(var_size);
+
 	    /* dynamic symbol rotation */
 	    if (nrec_rot) {
 		/* only first category */