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alexbevi
GitHub Repository: alexbevi/BizHawk
 Path: blob/master/Assets/Lua/NES/Ninja Gaiden II.lua
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-- Ninja Gaiden II (USA) Collision Box Viewer

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-- Author Pasky

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-- For use with Bizhawk

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local drawn = false -- Used to draw ryu's vulnaribility box only once per frame

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memory.usememorydomain("System Bus")

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function axis(x,y,color,xsize,ysize)

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	if xsize == nil then

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		xsize = 2

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	end

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	if ysize == nil then

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		ysize = 2

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	end

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	gui.drawLine(x+xsize,y,x-xsize,y,color)

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	gui.drawLine(x,y+ysize,x,y-ysize,color)

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	gui.drawLine(x,y,x,y,0xFF000000)

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end

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-- Player attacks

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local function pattack()

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	if memory.read_u8(0xCA55) == 0xB9 and memory.read_u8(0xCA56) == 0xF0 and memory.read_u8(0xCA57) == 0x04 then -- Bank check

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		local xreg = emu.getregister("X")

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		local yreg = emu.getregister("Y")

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		-- Sword

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		local x = memory.read_u8(0x550 + yreg)

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		local y = memory.read_u8(0x580 + yreg) - 0x03

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		local xrad = 0x20

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		if bit.band(memory.read_u8(0x4F0 + yreg),0x40) == 0x40 then -- check ryu facing direction

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			xrad = -0x20

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		end

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		--  NOTE:  The sword has no yradius, using drawBox() with a duplicate y coordinate does not draw a box, drawLine() is used in its place

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		gui.drawLine(x,y,x+xrad,y,0xFFFFFFFF) -- Draw sword hitbox (line)

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		-- Enemy vuln boxes (green)

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		x = memory.read_u8(0x550 + xreg)

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		y = memory.read_u8(0x580 + xreg)

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		xrad = memory.read_u8(0x610 + xreg)

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		local yrad = memory.read_u8(0x628 + xreg)

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		gui.drawBox(x-xrad,y-yrad,x+xrad,y+yrad,0xFF00FF00,0x4000FF00)

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	end

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end

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-- Touch collision

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local function collision()

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	if memory.read_u8(0xCC33) == 0xB9 and memory.read_u8(0xCC34) == 0x50 and memory.read_u8(0xCC35) == 0x05 then -- Bank check

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		local xreg = emu.getregister("X")

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		local yreg = emu.getregister("Y")

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		local x = memory.read_u8(0x550 + yreg)

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		local y = memory.read_u8(0x580 + yreg)

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		local xrad = memory.read_u8(0x610 + yreg)

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		local yrad = memory.read_u8(0x628 + yreg)

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		gui.drawBox(x-xrad,y-yrad,x+xrad,y+yrad,0xFFFF0000,0x40FF0000)

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		-- Player

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		if drawn == false then

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			local x = memory.read_u8(0x550)

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			local y = memory.read_u8(0x580)

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			local hp = memory.read_u8(0x80)

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			local xrad = 0x06

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			local yrad = 0x10

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			if bit.band(memory.read_u8(0x520),0x02) == 0x02 then -- Check if ryu is crouching

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				yrad = 0x0C

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			end

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			gui.drawBox(x-xrad,y-yrad,x+xrad,y+yrad,0xFF0000FF,0x400000FF)

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			drawn = true

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		end

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	end

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end

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-- Subweapons

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local function subweapon()

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	if memory.read_u8(0xCB2F) == 0xBD and memory.read_u8(0xCB30) == 0x50 and memory.read_u8(0xCB31) == 0x05 then -- Bank check

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		-- sub weapon

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		local xreg = emu.getregister("X")

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		local yreg = emu.getregister("Y")

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		local x = memory.read_u8(0x550 + yreg)

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		local y = memory.read_u8(0x580 + yreg)

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		local xrad = memory.read_u8(0xC0)

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		local yrad = memory.read_u8(0xC0)

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		gui.drawBox(x-xrad,y-yrad,x+xrad,y+yrad,0xFFFFFFFF,0x40FFFFFF)

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		-- Enemy vuln (green)

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		x = memory.read_u8(0x550 + xreg)

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		y = memory.read_u8(0x580 + xreg)

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		xrad = memory.read_u8(0x610 + xreg)

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		yrad = memory.read_u8(0x628 + xreg)

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		gui.drawBox(x-xrad,y-yrad,x+xrad,y+yrad,0xFF00FF00,0x4000FF00)

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	end

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end

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event.onmemoryexecute(collision,0xCC33)

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event.onmemoryexecute(pattack,0xCA55)

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event.onmemoryexecute(subweapon,0xCB2F)

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while true do

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	emu.frameadvance()

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	drawn = false

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end

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