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    Another use of RenderTarget

    chuz0chuz0 Member
    edited July 2016 in General questions
    Hello,
    Besides the obvious use, it can also be used for buttons with odd shapes.
    See the code below:
    inicio = Core.class(Sprite)
 
function inicio:init()
	wi = application:getContentWidth()
	he = application:getContentHeight()
 
	local source = Bitmap.new(Texture.new("US_map_blank.jpg", true)) -- blank map
 
	local colormap = Bitmap.new(Texture.new("US_map_colors.jpg",true)) -- coloured map
 
	rt = RenderTarget.new(wi,he)
	rt:draw(colormap)
	local bmp = Bitmap.new(rt)
	bmp:setPosition(0, 0)
	self:addChild(bmp)
 
	self:addChild(source)
 
	self:addEventListener(Event.MOUSE_UP, self.onMouseUp, self)
 
end
 
function inicio:onMouseUp(ev)
 
	local col,alph = rt:getPixel(ev.x, ev.y)
 
	if math.abs(col-tonumber(000000,16))<5 then
		print("California")
	end
	if math.abs(col-tonumber(111111,16))<5 then
		print("Arizona")
	end
	if math.abs(col-tonumber(222222,16))<5 then
		print("New Mexico")
	end
	if math.abs(col-tonumber(333333,16))<5 then
		print("Texas")
	end
	if math.abs(col-tonumber(444444,16))<5 then
		print("Louisiana")
	end
	if math.abs(col-tonumber(555555,16))<5 then
		print("Mississippi")
	end
	if math.abs(col-tonumber(666666,16))<5 then
		print("Alabama")
	end
	if math.abs(col-tonumber(777777,16))<5 then
		print("Florida")
	end
 
end
    Since it's just a proof of concept, and the code can be improved, I've just used the most southern states.
    Find attached the jpgs I've used.

    Regards.

    Likes: antix, pie, n1cke, JuanZambrano

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