Interoperable interactive geometry for Europe
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States that the line can be moved freely with the mouse as long as it passes through the point.

It is somehow the dual of point_on_line.

Do not confuse this symbol with line_through_two_points.

The user interface of many DGS does not allow for this functionality, and so many DGS do not implement this constraint. See also free_line for another example of a constraint that most DGS cannot implement because their user interface does not allow for it.


  1. pacman example: source JSXGraph