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Remove alpha value check from ImageButton

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With LOVE 11.0 it is no longer possible to retrieve an ImageData from
an Image and thus there is no posibility to retrieve the alpha value
of a single pixel.
Another solution would be to additionally supply an ImageData
to the ImageButton in order to be able to retrieve the alpha values.
This commit is contained in:
Matthias Gazzari 2018-04-22 20:00:54 +02:00
parent 8ec0e638ce
commit c11db7d444
2 changed files with 3 additions and 6 deletions
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4
docs/widgets.rst
View file

@ -39,8 +39,8 @@ Creates an image button widget at position ``(x,y)``.
Unlike all other widgets, an ``ImageButton`` is not affected by the current Unlike all other widgets, an ``ImageButton`` is not affected by the current
theme. theme.
The argument ``normal`` defines the image of the normal state as well as the The argument ``normal`` defines the image of the normal state as well as the
area of the widget: The button activates when the mouse is over a pixel with area of the widget: The button activates when the mouse is over a pixel of the
non-zero alpha value. rectangular image area.
You can provide additional ``hovered`` and ``active`` images, but the widget area You can provide additional ``hovered`` and ``active`` images, but the widget area
is always computed from the ``normal`` image. is always computed from the ``normal`` image.

5
imagebutton.lua
View file

@ -11,14 +11,11 @@ return function(core, normal, ...)
opt.id = opt.id or opt.normal opt.id = opt.id or opt.normal
opt.state = core:registerMouseHit(opt.id, x,y, function(u,v) opt.state = core:registerMouseHit(opt.id, x,y, function(u,v)
local id = opt.normal:getData()
assert(id:typeOf("ImageData"), "Can only use uncompressed images")
u, v = math.floor(u+.5), math.floor(v+.5) u, v = math.floor(u+.5), math.floor(v+.5)
if u < 0 or u >= opt.normal:getWidth() or v < 0 or v >= opt.normal:getHeight() then if u < 0 or u >= opt.normal:getWidth() or v < 0 or v >= opt.normal:getHeight() then
return false return false
end end
local _,_,_,a = id:getPixel(u,v) return true
return a > 0
end) end)
local img = opt.normal local img = opt.normal