middle point formula
Blitz3D Forums/Blitz3D Programming/middle point formula
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| Can someone help me with forumula to calculate middle point on a line? Given two points p1(x1,y1) and p2(x2,y2) I need to calculate middle point between them. I remeber this from school but can't get it to work in every situation. Can you give me example/formula that works? |
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| centerx = (x1+x2)/2.0 I'll leave the y coordinate to you... |
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| Doooh, what was I thinking, it's so simple :) Thanks fredborg drinks is on me if I ever run into you :) |
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| Can you believe i actually had to do a google search for this thread :S.... duh! |
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| This has been asked a few times here, so you're not the only ones... :o) |
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| 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# |
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| You have too much time on your hands, sswift. :P (I can't call you 'swifty' anymore because there is now another forum member with that name. Boo.) |
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