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> Solution: P4 = (x3+x2-x1, y3+y2-y1)
Awww, that's too EASY... :-)
Good point, Michael. I got so caught up in trigonometry that I
didn't think of the obvious approach.
That will produce a line from P3 to P4 at the same angle as the
original P1-P2 line. P3 will be one endpoint. If you wanted the
parallel line centered around P3, you could just add/subtract 1/2 the
x2-x1 and y2-y1 values to the P3 location.
Gary
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