Color Bar

[pdjakow]

Is there any possibility to draw color bar with colors depends on other variable? For example I wan't to draw precipitation forecast with green for liquid precipitations and blue for solid precipitations.

[embeepea]

Multigraph doesn't currently have a direct way of doing this -- i.e. of having the color of a bar be determined by another variable.

Multigraph currently supports having the bars in a bar graph either all be a single color, or having their colors depend on the height of the bar (by using the "min" and/or "max" attribute on the bar color option tags). But there's no way to tie the bar color to some other variable.

One could create a graph that looks like it allows for bar colors dependent on another variable by organizing the data into separate <data> sections, and separate corresponding <plot> sections, where each section corresponds to bars of a particular color. So, in your example, group all the liquid precip data into one <data> section, and have a <plot> section for that data that uses green bars, and then have a separate <data> section and <plot> section that uses blue bars for the solid precip data.

It would be possible to add a new renderer type to Multigraph that would provide for bars whose color is determined by a variable, but that would involve modifying the Multigraph source code. If that's a feature that you'd find useful, let us know and we'll add it to our list of requested features to be implemented at some point in the future.