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DarkBASIC Discussion / math problems

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Takeshii
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Posted: 30th Apr 2006 14:51
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Well, I'm not the best at math, but im always willing to learn. My problem is that I have a line, with the two ordered pairs stored into 4 different variables (ax, ay, bx, by) and i need to apply a angle to that line, say 30 degrees, and keep the distance the same. Either this is too simple for me to see, or to complex for me.

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Xander
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Posted: 1st May 2006 00:44 Edited at: 1st May 2006 00:46
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-Find the starting angle and distance of the line

angle=atanfull(ay-by,ax-bx)
distance=sqrt((ax-bx)^2+(ay-by)^2)

-Add 30 degrees to it

angle=wrapvalue(angle+30)

-Find new points

bx=cos(angle)*distance+ax
by=sin(angle)*distance+ay

That should do it

[edit] fixed a big stupid mistake...

Xander Moser - Bolt Software - Firewall
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Takeshii
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Posted: 1st May 2006 06:53
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That is exactly what I was looking for, thank you very much!

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Xander
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Posted: 1st May 2006 08:38
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No problem, glad you understood basic trig

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