Water Tanks Mini

local Tank = {
x = 0,
y = 0,
dir = 0,
power = 50,
moves = 4,
color = colors.blue
}

local w, h = term.getSize()
local function draw(string, x, y, txtcol, bakcol)
    string = string or ""
    txtcol = txtcol or colors.white
    bakcol = bakcol or colors.black
    term.setCursorPos(x, y)
    term.setBackgroundColor(bakcol)
    term.setTextColor(txtcol)
    term.write(string)
end

local function Tank:new(x, y, dir, power, color)
    local class = {x = x, y = y, dir = dir, power = 50, moves = 4, color = color}
    setmetatable(class, self)
    self.__index = self
    return class
end

local function Tank:display()
    local tankimg = {{0, self.color, 0}, {self.color, self.color, self.color}}
    paintutils.drawImage(tankimg, self.x, self.y)
    local barrel, x, y
    local back = 2^15
    if self.dir == 1 then
        barrel, x, y = "-", -1, 0
    elseif self.dir == 2 then
        barrel, x, y = "\\", -1, -1
    elseif self.dir == 3 then
        barrel, x, y = "|", 0, -1
    elseif self.dir == 4 then
        barrel, x, y = "/", 1, -1
    elseif self.dir == 5 then
        barrel, x, y =  "-", 1, 0
    elseif self.dir == 6 then
        barrel, x, y = "\\", 1, 1
        back = self.color
    elseif self.dir == 7 then
        barrel, x, y = "|", 0, 1
        back = self.color
    elseif self.dir == 8 then
        barrel, x, y = "/", -1, 1
        back = self.color
    end
    draw(barrel, self.x + x, self.y + y, colors.white, back)
end

local function Tank:changeAngle(events)

end

local function Tank:move(events)
    self.moves = self.moves - 1
    if events[2] == keys.left then
        self.x = self.x + 1
    elseif evebts[2] == keys.right then
        self.x = self.x - 1
    end
end