svg_define_viewports() sets smaller tick labels and more space for them

v1/libtpcsvg/svg_vport.c

@@ -166,14 +166,14 @@ int svg_define_viewports(
   if(verbose>2) printf("max_yaxis_label_len=%d\n", m);
   if(m<3) vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/14;
   else if(m<5) vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/10;
-  else if(m<7) vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/8;
-  else vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/5;
+  else if(m<7) vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/7; // prev 8
+  else vp->coordinate_area_viewport.x=vp->plot_area_viewport.w/4; // prev 5
   vp->coordinate_area_viewport.y=0;
   vp->coordinate_area_viewport.w=vp->plot_area_viewport.w-vp->coordinate_area_viewport.x;
   vp->coordinate_area_viewport.h=19*vp->plot_area_viewport.h/20;
   /* Calculate the character size for tick labels etc */
   vp->plot_area_viewport.chr_size=vp->coordinate_area_viewport.chr_size=
-    ceil(0.67*(double)(vp->plot_area_viewport.h-vp->coordinate_area_viewport.h));
+    ceil(0.62*(double)(vp->plot_area_viewport.h-vp->coordinate_area_viewport.h)); // prev 0.67
 
   if(verbose>3) printf("coordinate_area_viewport.h := %d\n", vp->coordinate_area_viewport.h);