v.transform fix for https://trac.osgeo.org/grass/ticket/1615

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@52782 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.transform/main.c

@@ -59,7 +59,7 @@ int main(int argc, char *argv[])
 
     /* columns */
     unsigned int i;
-    int idx;
+    int idx, out3d;
     char **tokens;
     char *columns_name[7];	/* xshift, yshift, zshift, xscale, yscale, zscale, zrot */
 
@@ -181,6 +181,8 @@ int main(int argc, char *argv[])
 
     Vect_check_input_output_name(vold->answer, vnew->answer, G_FATAL_EXIT);
 
+    out3d = WITHOUT_Z;
+
     if (!table->answer && columns->answer) {
 	G_fatal_error(_("Table name is not defined. Please use '%s' parameter."),
 		      table->key);
@@ -191,40 +193,6 @@ int main(int argc, char *argv[])
 		       "Otherwise the table is overwritten."));
     }
 
-    /* open vector maps */
-    Vect_open_old2(&Old, vold->answer, "", field->answer);
-    Vect_open_new(&New, vnew->answer, Vect_is_3d(&Old) || tozero_flag->answer ||
-		  strcmp(zshift->answer, "0.0") || strcmp(zscale->answer, "1.0") || 
-		  strcmp(zrot->answer, "0.0") ? WITH_Z : WITHOUT_Z);
-
-    /* copy and set header */
-    Vect_copy_head_data(&Old, &New);
-
-    Vect_hist_copy(&Old, &New);
-    Vect_hist_command(&New);
-
-    sprintf(date, "%s", G_date());
-    sscanf(date, "%*s%s%d%*s%d", mon, &day, &yr);
-    sprintf(date, "%s %d %d", mon, day, yr);
-    Vect_set_date(&New, date);
-
-    Vect_set_person(&New, G_whoami());
-
-    sprintf(buf, "transformed from %s", vold->answer);
-    Vect_set_map_name(&New, buf);
-
-    Vect_set_scale(&New, 1);
-    Vect_set_zone(&New, 0);
-    Vect_set_thresh(&New, 0.0);
-
-    Vect_get_map_box(&Old, &box);
-
-    /* z to zero */
-    if (tozero_flag->answer)
-	ztozero = 0 - box.B;
-    else
-	ztozero = 0;
-
     /* tokenize columns names */
     for (i = 0; i <= IDX_ZROT; i++) {
 	columns_name[i] = NULL;
@@ -273,6 +241,46 @@ int main(int argc, char *argv[])
     trans_params[IDX_ZSCALE] = atof(zscale->answer);
     trans_params[IDX_ZROT] = atof(zrot->answer);
 
+    /* open vector maps */
+    Vect_open_old2(&Old, vold->answer, "", field->answer);
+
+    /* should output be 3D ? 
+     * note that z-scale and ztozero have no effect with input 2D */
+    if (Vect_is_3d(&Old) || trans_params[IDX_ZSHIFT] != 0. ||
+	columns_name[IDX_ZSHIFT])
+	out3d = WITH_Z;
+
+    Vect_open_new(&New, vnew->answer, out3d);
+
+    /* copy and set header */
+    Vect_copy_head_data(&Old, &New);
+
+    Vect_hist_copy(&Old, &New);
+    Vect_hist_command(&New);
+
+    sprintf(date, "%s", G_date());
+    sscanf(date, "%*s%s%d%*s%d", mon, &day, &yr);
+    sprintf(date, "%s %d %d", mon, day, yr);
+    Vect_set_date(&New, date);
+
+    Vect_set_person(&New, G_whoami());
+
+    sprintf(buf, "transformed from %s", vold->answer);
+    Vect_set_map_name(&New, buf);
+
+    Vect_set_scale(&New, 1);
+    Vect_set_zone(&New, 0);
+    Vect_set_thresh(&New, 0.0);
+
+    Vect_get_map_box(&Old, &box);
+
+    /* z to zero */
+    if (tozero_flag->answer)
+	ztozero = 0 - box.B;
+    else
+	ztozero = 0;
+
+    /* do the transformation */
     G_important_message(_("Tranforming features..."));
     transform_digit_file(&Old, &New,
 			 ztozero, swap_flag->answer, trans_params,