Unwanted 'Pulsing' when Changing an Image's Angle

[Ray]

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.

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 …
>> it seems like there is always a bit one one…
>> 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-Mass-td4273701.html
>
>
>
>
> --
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