Unwanted 'Pulsing' when Changing an Image's Angle

[Ray]

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" <ray at 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
>>>
>>>
>>>
>>>
>>> --
>>> View this message in context:
>>> http://runtime-revolution.278305.n4.nabble.com/Missing-dragData-image-tp4
>>> 683313p4683321.html
>>> Sent from the Revolution - User mailing list archive at Nabble.com.
>>>
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