Unwanted 'Pulsing' when Changing an Image's Angle

[Terry Judd]

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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