The trace command takes as argument a geometric object which
depends on a parameter.
trace draws the trace of the object as the parameter is
changed or the object is moved in Pointer mode.
For example, to find the locus of points equidistant from a line
D and a point F, we can create a point H on
the line D. Since the point
To do this, open a graphic window (Alt-G) and type in the
following commands, one per line.
First, create a line D (using sample points) and a sample
point F.
Input
The create a point H on the line D which we can move
around.
Input:
To find a point equidistant from D and F, find the
point M where the perpendicular to D (at H) intersects
the perpendicular bisector to HF, and trace that point.
Input:
Then as the point H on the line moves (by changing the value of a with the slider), we will get the trace of M.
To erase traces, add traces, activate or deactivate them, use the Trace menu of the M button located on the right side of the geometry screen.