Allow overriding the chart colors

[lgs]

Many people want to use their own colors and not Pycha boring defaults, even when they are carefully choosen to looks nice.

So we want a system to let the user choose the colors. Such a system should try to enforce nice looking values using color theory but it also should allow the user to choose any color scheme, no matter how bad does it looks :-)

[aprzywecki@…]

Matplotlib (another graphing library) let's you specify colors using:

colors = ('b', 'g', 'r') pie(colors=colors...)

The chart will then use blue, green, red, blue, green, red, etc. when it draws the slices of the pie. I don't think they use any "make all charts look beautiful" code :)

Adam

[lgs]

I've implemented a pretty flexible color scheme system. You just need to subclass pycha.color.ColorScheme?, which is a dict subclass itself. Your dict should have a key for each dataset and its value is the color used to paint that dataset.

Pycha provides 3 color schemes:

• GradientColorScheme?: paints with old nice pycha colors
• FixedColorScheme?: paints with used specified colors
• RainbowColorScheme?: paints with the colors of the rainbow

Many different color schemes can be implemented using this system, including your cyclic suggestion :-)

All the code is in trunk since [170]

[lgs]

Replying to lgs:

I've implemented a pretty flexible color scheme system. You just need to subclass pycha.color.ColorScheme?, which is a dict subclass itself. Your dict should have a key for each dataset and its value is the color used to paint that dataset. Pycha provides 3 color schemes: - GradientColorScheme?: paints with old nice pycha colors - FixedColorScheme?: paints with used specified colors

Typo here: used -> user