Line calculators (fixed)
Rewritten by Miriam because the guy who originally wrote these
didn't even bother to check if they work. Both parts were not only
loaded with bad grammar and spelling mistakes, but mathematically
they were just plain wrong!
Finds the length of a line. Just give the coordinates of the start
and end points of the line.
It uses Pythagoras' formula: the square of the hypotenuse is
equal to the sum of the squares on the other two sides.
D = sqr((X2-X1)2 +
(Y2 - Y1)2)
Consider the X values separately from the Y values. Subtract the
smaller X value from the larger one to get the distance along the X
axis between the two values. Now divide that by 2 to get half the
distance, and add that distance back to the lower value to get the
midpoint along the X axis. Now do the same for the Y values: Subtract
the smaller Y value from the larger one to get the distance, get half
that, and add it to the lower value.