The trace command draws the trace of an object.
Example.
For example, to find the locus of points equidistant from a line
D and a point F, you can create a point H on
the line D. 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:
A:= point(-3-i) |
B:= point(1/2 + 2*i) |
D:= line(A,B,color=0) |
F:= point(4/3,1/2,color=0) |
Then create a point H on the line D which you can move
around.
Input:
assume(a=[0.7,-5,5,0.1]) |
H:= element(D,a) |
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:
T:= perpendicular(H,D) |
M:= single_inter(perpen_bisector(H,F),T)) |
trace(M) |
Then as the point H on the line moves (by changing the value of a with the slider), you 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.