Super Mario Bros. X Forums

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local iniNPC = function(v)
	local config = NPC.config[v.id]
	if not v.data.ini then
	  	v.data.ini = true
		v.data.sprite = Sprite.box{
			x = v.x,
			y = v.y,
			width = npcutils.gfxwidth(v),
			height = npcutils.gfxheight(v),
			texture = Graphics.sprites.npc[v.id].img,
			rotation = 0,
			align = Sprite.align.CENTRE,
			frames = npcutils.getTotalFramesByFramestyle(v)
		}
	end
end

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function arrow.onInitAPI()
	npcManager.registerEvent(npcID, arrow, "onTickNPC")         --this is only for text debugging
	npcManager.registerEvent(npcID, arrow, "onTickEndNPC")
	npcManager.registerEvent(npcID, arrow, "onDrawNPC")       --this is for drawing the sprite
end

local temp = 0
local angle = 0
local quadrent = 0
local PosX = 0
local PosY = 0

function arrow.onTickEndNPC(v)
	--Don't act during time freeze
	if Defines.levelFreeze then return end
	if v:mem(0x138, FIELD_WORD) > 0 then return end
	
	local data = v.data
	
	--If despawned
	if v.despawnTimer <= 0 then
		--Reset our properties, if necessary
		data.animationTimer = 0
                data.animationDirection = 1
                data.frame = 0
		data.initialized = false
		return
	end

	--Initialize
	if not data.initialized then
		v.ai1 = 0
		v.ai2 = 0
		data.initialized = true
	end

	--Execute main AI.
	if not v:mem(0x136, FIELD_BOOL) and v:mem(0x12C, FIELD_WORD) == 0 and data.initialized then
		arrow.arrowSourceHoming(v, data.speed or NPC.config[v.id].speed)
	end
end

Code: Select all

function arrow.arrowSourceHoming(v, speed)
    local targetPlayer = npcutils.getNearestPlayer(v)
    local toPlayerVect = vector(targetPlayer.x - v.x, targetPlayer.y - v.y)
    local speedVect = toPlayerVect:normalise() * speed        --Problem probably here. Speed (of NPC) changes the scaling of result angles. 

    PosX = speedVect.x                                                       --But using just using toPlayerVect made it worse
    PosY = speedVect.y
 
       --this part is right as I tested myself in each quadrant 
	temp = math.floor(math.atan(PosY, PosX)*(180/math.pi))
	if PosY > 0 then
		if PosX > 0 then
			angle = math.floor(temp)
			quadrent = 1
		else angle = math.floor(180 - temp)
			quadrent = 2
		end
	else
		if PosX > 0 then
			angle = math.floor(temp)
			quadrent = 4
		else angle = math.floor(180 - temp)
			quadrent = 3
		end
	end

	--Rotate
	iniNPC(v)
	v.data.sprite.rotation = 0          --reset after each rotation so it doesn't spin crazy
	v.data.sprite:rotate(angle)
end

Code: Select all

function arrow.onDrawNPC(v)
	if v:mem(0x12A, FIELD_WORD) <= 0 then return end

	local config = NPC.config[v.id]
	local p = -45

	if config.foreground then	p = -15	end
	v.data.sprite.x = v.x + v.width*0.5 + config.gfxoffsetx
	v.data.sprite.y = v.y + v.height*0.5 + config.gfxoffsety
	v.data.sprite:draw{priority = p - 0.1, sceneCoords = true, frame = v.animationFrame + 1}

	npcutils.hideNPC(v)
end