powe-manager's graph legends aren't very visible

Binary package hint: gnome-power-manager

Hello! This is about the latest-version Gnome Power Manager in Ubuntu Gutsy.

(1) The graph colors are used inconsistently between the various graphs. For instance, the Charge time accuracy profile uses blue for valid data and black for no data, the Charge time profile uses blue for no data and red for valid data, the Discharge time accuracy profile uses red for valid data but black for no data, and the Discharge time profile uses red for valid data, blue for no data, and some dark color (green? brown?) for extrapolated data.

I think these should be standardized on something like green=valid, red=no data, blue=extrapolated.

Black and other dark colors aren't easy to distinguish on many displays. They are used by the first three graphs (Power/time/charge history), maybe they should be replaced with brighter versions. For instance, orange is easy to differentiate from red and yellow, usually. Also, red and magenta (two "useful" colors) are used in those graphs for suspend and hibernate; since there isn't much data on those periods (as far as I can tell, it's only extrapolated from the before and after readings), maybe we could use one of the less "useful" colors for them. Also a dotted line might be good for those parts (actually, that might be a good idea for everything extrapolated).

(2) The "lines" parts of the legends are not very visible. On my machine (I'm not sure how dependent these things are on settings), the line legends have a one-pixel-by-ten line of the graph color, surrounded by a one-pixel border of black. I can only diferentiate red from the dark colors on my display, and blue if I look very closely. I think they should be replaced by diagonal lines (or little curves), about the size of the icons, drawn with the same antialiasing as on the graph; that would make them more easily visible.