Re: [Nplot-devel] [ nplot-Bugs-2315633 ] Improved Clipping Alogorithm

[Jamie M. <ja...@sc...>]

>
> Initial Comment:
> When you zoom in so that the graph does not contain any points,  
> nothing is drawn. However if you zoom in to one point the lines are  
> drawn to the points outside the GDI's clipping region. In the  
> LinePlot.cs file I found the following code:
>
> // do horizontal clipping here, to speed up
> if ((dx1 < leftCutoff || rightCutoff < dx1) &&
>    (dx2 < leftCutoff || rightCutoff < dx2))
> {
>    continue;
> }
>
> This code does not draw any lines if one point is on the left and  
> the other is on the right. In this case you would want the line to  
> be drawn. Here is an update to that clipping code that takes into  
> account that scenario:
>
> if (dx1 < leftCutoff && dx2 < leftCutoff)
> {
>     // Both points are to the left of the clipping region.
>     continue;
> }
> else if (dx1 > rightCutoff && dx2 > rightCutoff)
> {
>     // Both points are to the right of the clipping region.
>     continue;
> }
>
> If you have further questions, please feel free to contact me.
>
> Bob Cravens (bob...@gm...)
>

Hi Bob,

Thanks for your post.  One quick question... Did you check the code  
that is currently in trunk?  This problem sounds quite familiar to me  
and I think I've already made a fix in the trunk version.

Time to get a new version out so we don't duplicate work.

Cheers,

Jamie

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jamie McQuay
Scimatic Software Inc.
+1.416.529.9069
www.scimatic.com

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