Set the Opacity of a Button Background

RM richmondmathewson at gmail.com
Tue Mar 1 20:32:46 CET 2016



On 1.03.2016 21:30, RM wrote:
>
>
> On 1.03.2016 21:25, Sannyasin Brahmanathaswami wrote:
>> We looking at very simple button design:
>>
>> 1)  Border color is on/white/2px
>> 2)  background is set to clear (no color assignment and no icon)
>> 3)  background opacity set to 50% # if we can figure out how....
>> 4)  Button name/label white
>>
>> Now... I realize that if # 2 above is true, then possibly, since 
>> there are no pixels at all in the background that the algorithm might 
>> not be possible from a video card point of view... so we *could* set 
>> the background to white and set the opacity to a 
>> grayscale?transparency value of say... 50%  but the idea is that the 
>> text of the button name/label remains fully, 100% opaque, even 
>> thought background has an alpha channel value (some level of 
>> transparency)
>>
>>  From my fiddling... (I could be missing something) this is not 
>> possible either with buttons of fields  or graphics.
>>
>> The use case is, again, as discussed in another thread: we want 
>> visibility of the text on top of *any* image to be visible. We do 
>> this in print all the time... but we cannot separate the blending of 
>> the text label or text itself and the background of a button/field in 
>> LC... at least I have not found a way.
>
> Um, well, at the risk of annoying you somewhat . . .
>
> I have almost always "rolled my own" buttons just because of the 
> limitations on Livecode-native
> buttons.
>
> I use GIMP with a series of layers (nothing particularly original or 
> difficult there): one for the
> 'button' (rectangle with rounded edges), one for the image, and one 
> for the label. Then one can
> fiddle around with levels of transparency as much as one likes.
>
> Richmond.

Oh, I'm sorry, I fired that one off a bit too quickly.

The faux buttons made in GIMP have to be imported and used as images in 
Livecode, because PNG
images with differing levels of transparency seem to lose the 
transparency when they are used
as icons inwith actual buttons.

R.
>
>>
>>
>>
>>
>> On March 1, 2016 at 9:15:36 AM, RM 
>> (richmondmathewson at gmail.com<mailto:richmondmathewson at gmail.com>) wrote:
>>
>> Do you mean that you want a button where an icon/image is set at 100%
>> opacity and the rest of
>> the button to, say, 50% transparency?
>>
>> Would be grateful if you could clarify this.
>>
>> Richmond.
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