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Update >r r> to dip in math.quaternions

db4
Aaron Schaefer 2008-11-08 16:47:58 -05:00
parent 774cb858d5
commit 326ce8c71b
1 changed files with 5 additions and 5 deletions
extra/math/quaternions

10
extra/math/quaternions/quaternions.factor
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@ -16,9 +16,9 @@ IN: math.quaternions
: 2q ( u v -- u' u'' v' v'' ) [ first2 ] bi@ ; inline
: q*a ( u v -- a ) 2q swapd ** >r * r> - ; inline
: q*a ( u v -- a ) 2q swapd ** [ * ] dip - ; inline
: q*b ( u v -- b ) 2q >r ** swap r> * + ; inline
: q*b ( u v -- b ) 2q [ ** swap ] dip * + ; inline
PRIVATE>
@ -51,12 +51,12 @@ PRIVATE>
: v>q ( v -- q )
#! Turn a 3-vector into a quaternion with real part 0.
first3 rect> >r 0 swap rect> r> 2array ;
first3 rect> [ 0 swap rect> ] dip 2array ;
: q>v ( q -- v )
#! Get the vector part of a quaternion, discarding the real
#! part.
first2 >r imaginary-part r> >rect 3array ;
first2 [ imaginary-part ] dip >rect 3array ;
! Zero
: q0 { 0 0 } ;
@ -71,7 +71,7 @@ PRIVATE>
! http://www.mathworks.com/access/helpdesk/help/toolbox/aeroblks/euleranglestoquaternions.html
: (euler) ( theta unit -- q )
>r -0.5 * dup cos c>q swap sin r> n*v v- ;
[ -0.5 * dup cos c>q swap sin ] dip n*v v- ;
: euler ( phi theta psi -- q )
[ qi (euler) ] [ qj (euler) ] [ qk (euler) ] tri* q* q* ;