Move to the points of an (tilted) oval?
Mick Collins
mickclns at mac.com
Sat Dec 19 18:09:55 EST 2009
Here is a modification of Jacques Hausser's handler to allow an oval
(ellipse) tilted by thetaDeg degrees and repeating once or many times
(or 4000000000 for forever, around 125 years if you wanna get picky)
on dotest
put 30 into stepSize
repeat with i = 0 to 360 step stepSize
Orbite the long name of grc "laGrc", 130, 40, 250, 250, i, 1
end repeat
end dotest
command Orbite theObject, ax,bx,centerX,centerY,thetaDeg,nRepeat
-- theObject: long name of the object to be rotated (so you can
use any kind of object)
-- ax,bx: half length of the horizontal and the vertical axes
of the orbite (if equal, the move will be circular)
-- centerX,centerY: center of rotation
put thetaDeg *pi/180 into thetaRad
put cos(thetaRad) into cosT
put sin(thetaRad) into sinT
repeat nRepeat times
if the mouse is down then exit repeat -- or any other exit test
repeat with i = 0 to 90
put round(ax*cos(4*i*pi/180)*cosT-bx*sin(4*i*pi/180)*sinT)
+centerx, round(bx*sin(4*i*pi/180)*cosT+ax*cos(4*i*pi/180)*sinT) +
centery into laloc
set the loc of theobject to laloc
wait 5 millisecond -- can be tuned for speed and softness
of the move
end repeat
end repeat
end Orbite
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