id summary reporter owner description type status priority milestone component version resolution keywords cc cpu platform 1283 PNG driver and Cairo driver mangle large symbols, XDRIVER doesn't hamish grass-dev@… "Hi, in GRASS 6.x the PNG driver and Cairo driver badly mangle large ring symbols, while the XDRIVER doesn't. This makes the creation of automated PNG plots on a headless server somewhat problematic, unless the more tortuous ps.map + pstoimg method is used. (note even though it's headless it still needs X.org installed, as a dependency of the Cairo driver's X11-output option) The PNG driver has an uneven inner/outer radius and gouges out of it; the Cairo driver does not path the line segments together at all. examples images attached. {{{ cat << EOF > test.grf width 30 symbol basic/circle 500 50 50 red none EOF d.mon x4 d.resize w=825 h=650 d.graph test.grf xwd | xwdtopnm | pnmtopng > xdriver_ring.png d.out.file png_driver_ring d.out.file -c cairo_driver_ring }}} In GRASS 7 the situation is a bit better, the PS and one of the PNG|cairo* drivers(?) makes nice looking output, only complaint is that the closed ring has a sliver where it isn't closed. could a special beginning==end test be added to have it code the path? Also, is it possible to double or quadruple the number of vertices in the ring? At the current number it is very obviously a polygon and not a circle. {{{ cat << EOF > test.grf width 30 symbol basic/circle 500 50 50 red none EOF export GRASS_WIDTH=825 export GRASS_HEIGHT=650 export GRASS_RENDER_IMMEDIATE=PNG export GRASS_PNGFILE=png_driver7_ring.png d.graph test.grf export GRASS_RENDER_IMMEDIATE=CAIRO export GRASS_PNGFILE=cairo_driver7_ring.png d.graph test.grf export GRASS_RENDER_IMMEDIATE=PS export GRASS_PNGFILE=cairo_driver7_ring.ps d.graph test.grf }}} [*] I'm not sure which driver it's using actually, I get an identical output file for both. -- that is when setting 7's GRASS_RENDER_IMMEDIATE=PNG doesn't make d.graph SegFault, while the cairo driver doesn't. then I can tell. [**] should ""GRASS_RENDER_IMMEDIATE=cairo"" be uppercase or not? the man page shows both ways. thanks, Hamish" defect new major 6.4.6 Display svn-develbranch6 symbols, pngdriver, Draw_line.c x86-64 Linux