[Tioga-users] Help with legend placement on scatter plot

[Bill Paxton]

On May 6, 2008, at 5:52 PM, David MacMahon wrote:

> Quick question: Must one know in advance how many legend entries  
> there will be so that legend_bottom_margin can be set appropriately  
> (assuming the legend starts near the top)?  If so, how does one  
> calculate the legend height?  Presumably, legend_bottom_margin =  
> 1.0 - legend_top_margin - legend_height, where legend_height  
> depends on the number of entries and each entry's height.


Hi Dave,

Quick answer to your quick question is that I think the legend  
interface needs some work!
Perhaps you'd like to volunteer?  ; - )

The show_legend routine in FigMrk.rb calculates the placement of  
legend entries.  Take a look and see how it sets and modifies the y  
coordinate.   It is using self.default_text_height_dy and  
self.legend_scale and self.legend_text_ystart.

Let me know if I can clarify anything in the code.

Cheers,
Bill

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