middle point formula

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sswift

Here's how to do it the hard way!

First calculate the length of the line, like so:
D# = Sqr((X2#-X1#)^2 + (Y2#-Y1#)^2)

Then calculate a vector from the line:
Vx# = X2#-X1#
Vy# = Y2#-Y1#

Then normalize that vector:
Nx# = Vx# / D#
Ny# = Vy# / D#

Then divide the length by 2:
D# = D# / 2.0

Then multiply the normal by that length:
Vx# = Nx# * D#
Vy# = Ny# * D#

And finally, add that vector to the start point to determine the location of the center of the line:
X3# = X1# + Vx#
Y3# = Y1# + Vy#