Grab Me Fails on snapshot Images of fields which are transparent (opaque false)

[Matt Maier]

Maybe snapshot with a file type that doesn't have an alpha channel?


On Fri, Feb 5, 2016 at 9:25 PM, Sannyasin Brahmanathaswami <brahma at hindu.org
> wrote:

>
> I have a puzzle widget that is made by importing a snapshot of a field
> with words in it, then we make a copy of that images and repeatedly crop to
> each word.
>
> Now we have small image tiles.  Works great BUT
>
> Problem: The original field has a transparent background. which I am
> hoping to keep. And unexpectedly, the snapshot of the field seems to
> include the alpha channel for the background which is set to transparent…
> so you *can* see through the images.
>
>  If you put “grab me” into the
>
> on mousedown
>    grab me
> end mousedown
>
> script of the image tiles created by this method… you cannot grab the
> image — either with the pointer mouse tool on desktop or your finger on
> mobile— unless you are in contact with the pixels of the letters of the
> word. Even though the rect of the image includes areas above, below beyond
> and obviously in between the letters… if you contact any of those areas,
> you cannot drag, the image tile
>
> Am I wrong in thinking that the grab me message should be sent if you
> mousedown anywhere in the rect of the image?
>
> I confirmed this by setting the field with a colored background, then
> making the tiles… now you can move them around by  easily no matter where
> your finger or mouse contacts the image.
>
> work around of course is to set the background to the same color as the
> tiles… but what I really want is to be able to see through the tiles.
>
> If I wanted to test how would you do this: set the alpha channel of the
> background of these images to just a small value… they would still be
> semi-tranparent, but perhaps grabme would see them as “grabbable”
> throughout the entire rect?  How would you do that
>
> ??
>
> BR
>
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