Mod example: a simple button

This mod draws a button with text "Click me!" in the upper left corner of new game screen. When user clicks the button, it disappears.

Download: https://drive.google.com/open?id=1LtOLIM8YwhvxJ_s5Kox0kS0IHVy4B-ds

Here is the entire source code the mod:

local function init(self)
	local visible = true
	local x = 10
	local y = 10
	local clickme=sdl.surface(self.resourcePath.."clickme.png")
	local hangarGraphic=sdl.surface(self.resourcePath.."hangar_main.png")
	
	AUTO_HOOK_Draw_Hangar = sdl.drawHook(function(screen)
		if hangarGraphic:wasDrawn() and visible then
			screen:blit(clickme,nil,x,y)
		end
	end)
	
	AUTO_HOOK_Event_Hangar = sdl.eventHook(function(event)
		if event:type() == sdl.events.mousebuttondown then
			if visible and sdl.mouse.x() >= x and sdl.mouse.y() >= y and sdl.mouse.x() < x + clickme:w() and  sdl.mouse.y() < y + clickme:h() then
				visible = false
				return true
			end

			return false
		end
	end)
end

local function load(self,options,version)

end

return {
	id = "C_ASimpleButton",
	name = "A Simple Button",
	version = "1.0.0",
	requirements = {},
	init = init,
	load = load,
}