--[[
Copyright (c) 2013 Julius Riecke

This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you must not
   claim that you wrote the original software. If you use this software
   in a product, an acknowledgment in the product documentation would be
   appreciated but is not required.

   2. Altered source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

   3. This notice may not be removed or altered from any source
   distribution.
]]

-- Zapper Fun
-- quick and dirty script that shows zapper position and fire button presses in FCEUX
-- Written by miau
-- http://morphcat.de/lua/

local Z_LSPAN = 20 --life span (in frames) of white box
local Z_LSPAN_CLICK = 30 --life span of red box
local Z_MAX = 60 --maximum amount of boxes on screen

local zbuf = {}
local zindex = 1
local timer = 0
local lastclick = zapper.read().click
local lastx = zapper.read().x
local lasty = zapper.read().y

function zapper_addcoord(x,y,click)
	zbuf[zindex] = {t=timer,x=x,y=y,click=click}
	zindex = zindex + 1
	if(zindex>Z_MAX) then
		zindex = 1
	end
end

function box(x1,y1,x2,y2,color1,color2)
	if(x1>=0 and y1>=0 and x2<=255 and y2<=255) then
		gui.drawbox(x1, y1, x2, y2, color1, color2)
	end
end


 
 while(true) do
	local x = zapper.read().xmouse
	local y = zapper.read().ymouse
	local click = zapper.read().click
	--gui.text(0, 8, string.format("x=%d",x));
	--gui.text(0, 18, string.format("y=%d",y));
	--gui.text(0, 28, string.format("click=%d",click));
	if(click==1 and click~=lastclick) then
		zapper_addcoord(x,y,1)
	elseif(x~=lastx or y~=lasty) then
		zapper_addcoord(x,y,0)
	end
	lastclick=click
	lastx=x
	lasty=y
	box(x-3, y-3, x+3, y+3, "white", 0)
	
	for i=1,Z_MAX do
		if(zbuf[i]) then
			ltime = timer-zbuf[i].t
			if(zbuf[i].click==0) then
				if(ltime<Z_LSPAN) then
					boxsize = (zbuf[i].t-timer+Z_LSPAN) / (Z_LSPAN/3)
					c = "white"
					box(zbuf[i].x-boxsize, zbuf[i].y-boxsize, zbuf[i].x+boxsize, zbuf[i].y+boxsize, c, 0)
				end
			elseif(zbuf[i].click==1) then
				if(ltime<Z_LSPAN_CLICK) then
					boxsize = (timer-zbuf[i].t) / (Z_LSPAN_CLICK/10)
					c = "red"
					box(zbuf[i].x-boxsize, zbuf[i].y-boxsize, zbuf[i].x+boxsize, zbuf[i].y+boxsize, c, 0)
				end
			end
		end
	end
	
 	FCEU.frameadvance()
	timer = timer + 1
 end