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2D All the way! / formula for converting angle into dx&dy ?

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IBOL
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Posted: 31st Mar 2004 11:26
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hey guys,

i am looking for some kind of formula to smoothly compute
DX and DY from an ANGLE
(DX is a number -1 to 1 which indicates the amount in the "X" direction a sprite moves. DY is the same for the "Y" direction.
one rule is that ABS(DX)+ABS(DY)=1)

i have dx and dy worked out for 16 divisions of a circle (every 22.5 degrees), but would like a smooth computation.

thanks,
bob
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Code Stealer
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Posted: 31st Mar 2004 12:14
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I have a program that can do rotation using atan command, and triangles and trigonometry, so maybe you would like to see it, as it gives proper rotations out.

GIve me more power!
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IBOL
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Posted: 31st Mar 2004 15:48
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you have a program that "maybe i would like to see" ?
well, where is it? what is the basis of it?
hmm?

thanks to you , i experimented and found a USE for TRIG !
incredible as that may sound, i have found the answer to my
own question:

BDX#(T)=SIN(ANG)*BS
BDY#(T)=0-COS(ANG)*BS

although the condition:
ABS(DX)+ABS(DY)=1
is not always met

thanks,
hope this helps someone else,
programming all night long,
bob
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Posted: 31st Mar 2004 16:00
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The programs I am talking about are just trig routines. One works out the distance between 2 points, another works out the rotation of a sprite at point A facing pointB, and the 3rd one compiles the 2 routines into a homing missile.

GIve me more power!
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