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Add scaling support for ImageButton #91

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Add scaling support for ImageButton #91

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21 changes: 14 additions & 7 deletions imagebutton.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -12,21 +12,27 @@ return function(core, normal, ...)
opt.hovered = opt.hovered or opt[2] or opt.normal
opt.active = opt.active or opt[3] or opt.hovered
opt.id = opt.id or opt.normal
opt.scale = opt.scale or 1

local image = assert(opt.normal, "No image for state `normal'")

core:registerMouseHit(opt.id, x, y, function(u,v)
-- mouse in image?
u, v = math.floor(u+.5), math.floor(v+.5)
if u < 0 or u >= image:getWidth() or v < 0 or v >= image:getHeight() then
local scaledWidth = image:getWidth() * opt.scale
local scaledHeight = image:getHeight() * opt.scale
if u < 0 or u >= scaledWidth or v < 0 or v >= scaledHeight then
return false
end

if opt.mask then
-- alpha test
-- convert scaled coordinates back to original image coordinates
local originalU = math.floor(u / opt.scale + 0.5)
local originalV = math.floor(v / opt.scale + 0.5)
assert(isType(opt.mask, "ImageData"), "Option `mask` is not a love.image.ImageData")
assert(u < mask:getWidth() and v < mask:getHeight(), "Mask may not be smaller than image.")
local _,_,_,a = mask:getPixel(u,v)
assert(originalU < opt.mask:getWidth() and originalV < opt.mask:getHeight(), "Mask may not be smaller than image.")
local _,_,_,a = opt.mask:getPixel(originalU, originalV)
return a > 0
end

Expand All @@ -41,10 +47,11 @@ return function(core, normal, ...)

assert(isType(image, "Image"), "state image is not a love.graphics.image")

core:registerDraw(opt.draw or function(image,x,y, r,g,b,a)
love.graphics.setColor(r,g,b,a)
love.graphics.draw(image,x,y)
end, image, x,y, love.graphics.getColor())
local r, g, b, a = love.graphics.getColor()
core:registerDraw(opt.draw or function(image,x,y, r,g,b,a, scale)
love.graphics.setColor(r or 1, g or 1, b or 1, a or 1)
love.graphics.draw(image, x, y, 0, scale, scale)
end, image, x,y, r or 1, g or 1, b or 1, a or 1, opt.scale)

return {
id = opt.id,
Expand Down