On 04/01/2014 02:17 PM, David Vanderson wrote:
Plot is fantastic - thanks so much!
Is there a way to hook into the interactive features of plot so, for
instance, the user could click to add data or drag data points around?
I'm using plot/dc to draw onto a canvas, and I'd be more than happy just
to be able to ask a plot to translate a pixel position to the
corresponding axes' positions. I know that plot does this for the
zooming feature, but is there a way for external code to do it?
There's not an easy way right now.
If you don't mind copying code, you can take some from `plot/dc' here:
pkgs/plot-pkgs/plot-lib/plot/private/no-gui/plot2d.rkt
The main thing you need is access to the `area' object, which has a
public `dc->plot' method that translates device context coordinates into
plot coordinates. I'm sorry it's not easier. :/
It will be someday, I promise! I've lately decided that "2D and 3D games
that use Plot to render scenes" will be two of my main test cases. Games
are the most interactive uses I can think of, and they need to be fast,
so that should cover pretty much everyone's interactivity needs.
Neil ⊥
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