Terry - thanks for shedding light on this. It's actually starting to
make sense now.
On 9/16/2014 10:58 PM, Terry Judd wrote:
On 17/09/2014 11:40 am, "Ray" <r...@linkit.com> wrote:
Fantastic! Setting LockLoc to false did the trick. I wonder why
lockLoc set to false creates this pulsing effect (the image is actually
getting smaller and returning to its original size) in the first place.
With the image selected, try setting different angles using the property
inspector and you¹ll see that the rect of the image changes (grows) quite
a bit. If you constrain the rect by setting its lockLoc to true then you
are actually reducing the image¹s size when the angle isn¹t 0 or 180
degrees (or 90 or 270 if it¹s of equal width and height).
TerryŠ
Anyway, problem solved.
And Alejandro, many thanks for sharing the code which I think I may have
some use for in another way.
Many thanks!
Ray Horsley
LinkIt! Software
On 9/16/2014 9:49 PM, Alejandro Tejada wrote:
Randy Hengst wrote
I don't know how to totally get rid of the wobble Š
it seems like there is always a bit one oneŠ
but I've seen the pulsing effect when
rotating an image with lockLoc set to true.
Yes, lockLoc produces this effect in
a rotating image. :(
Check if this handler posted by Jim Hurley
could help in your project:
On Jan 08, 2012, jim hurley posted
The script below will allow you to rotate an image about any predefined
point.
Create a button.
Create an image.
Place the button at any point relative to the image. (Perhaps use a
grab me
in a mousedown handler.)
Click the button.
The image will rotate about the center of the button.
(For your application you would replace the center of rotation with the
center of mass.)
on mouseUp
set the angle of img 1 to 0
put the loc of me into myLoc
--Set the coor of the rotation Pt
put item 1 of myLoc into x0
put item 2 of myLoc into y0
--Get the loc of the image
put the loc of img 1 into tLoc
put item 1 of tLoc into xC
put item 2 of tLoc into yC
--Get the distance between the roation pt and the image center
put sqrt ( (xC - x0 )^2 + (yC - y0)^2 ) into L
--Get the angle of the line from the rotation center to the image
center
put atan2(yC-y0, xC-x0) *180/pi into phi0
put 0 into tAngle
repeat 360 times
lock screen
set the angle of img 1 to -tAngle
put phi0 + tAngle into phi
set the loc of img 1 to (x0 + L * cos(phi*pi/180)), (y0 + L *
sin(phi*pi/180))
unlock screen
add 1 to tAngle
wait 10 millisec --or whatever
end repeat
end mouseUp
on mouseDown
grab me --So that you can relocate the rotation center.
end mouseDown
From this thread:
http://runtime-revolution.278305.n4.nabble.com/Rotate-around-Center-of-Ma
ss-td4273701.html
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