[b]Proposition:[/b] Clip Objects to a user panel.
[math]\;\;[/math] 1. line.
Bundling all the work of the last worksheet ([url]http://www.geogebratube.org/material/show/id/95270[/url]) into a tool.
In this case, I chose to solve the general problem of intersecting an arbitrary Polygon and Line.
The problem makes it plain why, for arbitrary figures, BLIT (with alpha) is a far more reasonable solution (and faster). (GGB does not afford this option, so I will hand-intersect what I need).
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Floating Panel: [url]http://www.geogebratube.org/material/show/id/94961[/url]
Intersect Polygon and Line: [url]http://www.geogebratube.org/material/show/id/96429[/url]
[math]\;\;[/math]Tool (.ggt): [url]http://www.geogebratube.org/material/show/id/96428[/url]