On 10/01/2014 05:20 PM, Shuhao Wu wrote: > I'm also impressed by the fact that the anti aliasing looks very good. I > assume this is handled by gnome
Yes -- by libgnomecanvas specifically (with the help of libart_lgpl again). Xournal doesn't do any antialiasing of its own. Libgnomecanvas has some annoying issues (no longer well-maintained, a few bugs, not compatible with gtk3, ...) but it does have some unique features like the high display quality (the other one you might not notice is performance -- xournal isn't always as fast as one would like, but with a less optimized display library it would be worse. Apparently the GTK3 canvas widgets that Daniel tried to use for his gtk3 port of xournal are much slower. A xournal document typically has hundreds of thousands of line segments and, while that's nothing compared to modern video games and other 3d stuff, it's enough to choke to death libraries that were written with business software in mind -- display refresh needs to think carefully about what exactly needs to be redrawn.) > and the fact that the line segment is so small? (0.3px?) In real life if you write quickly the line segments are not that short -- my tablet reports motions quickly and if the pen is moved slowly the line segments end up indeed being very short, but when drawing longer lines quickly the successive points can be 5-10 pixels apart (but what helps is that each point has a fractional position which is much more accurate than having just integer pixel coordinates). > Furthermore is pressure sensitivity data recorded per line segment? Yes, when pressure sensitivity is on, each line segment has its own pressure value and hence its own thickness. Denis -- Denis Auroux UC Berkeley, Department of Mathematics aur...@math.berkeley.edu Institut Henri Poincare, Paris aur...@ihp.fr ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Xournal-devel mailing list Xournal-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/xournal-devel
