ovellas/entidades/ovella.lua

require("../lib/helpers")

Ovella = {}
local OvellaMT = {__index = Ovella}

function Ovella:new(id, x, y)
    local instance = {}
    instance.id = id
    instance.sprite = love.graphics.newImage("img/ovella.png")
    instance.width = instance.sprite:getWidth()
    instance.height = instance.sprite:getHeight()
    instance.x = x-instance.width/2
    instance.y = y-instance.height/2
    instance.speed = 1

    return setmetatable(instance, OvellaMT)
end

function Ovella:update(pastor, cercado)
    -- vector 
    local X = pastor.x - self.x;
    local Y = pastor.y - self.y;
    distancia =  math.sqrt(math.pow(X, 2) + math.pow(Y, 2));

    --normalizase o vector
    X = X / distancia;
    Y = Y / distancia;

    -- redondease ó int máis cercano
    if X < 0 then
        X = math.floor(X - 0.5);
    else
        X = math.floor(X + 0.5);
    end
    if Y < 0 then
        Y = math.floor(Y - 0.5);
    else
        Y = math.floor(Y + 0.5);
    end

    -- velocidade
    dX = X * self.speed;
    dY = Y * self.speed;

    if distancia < DISTANCIA then
        -- movemento
        -- FIXME comprobar que non se vai de marxenes e non choca con muros
        -- print(Helpers:CheckCollision(self, cercado)) -- comprobaría con todo o cercado

        futuro = {}
        futuro.x = self.x - dX;
        futuro.y = self.y - dY;
        futuro.width = self.width--/3;
        futuro.height = self.height--/3;
        -- futuraOvella = Ovella:new(self.id, self.x-dX, self.y-dY)

        -- comprobar colisios con cada baldosa do cercado
        local colision = false
        for y = 1,cercado.filas do
            for x = 1,cercado.columnas do
                if cercado.tiles[y][x] ~= 'x' then
                    -- print(Helpers:CheckCollision(self, cercado.tiles[y][x])) 
                    -- if Helpers:CheckCollision(futuro, cercado.tiles[y][x]) then
                    if Helpers:CheckCollision( cercado.tiles[y][x],futuro) then
                        colision = true
                    end
                end
            end
        end

        if not colision then
            -- Establece a nova posición
            self.x = self.x - dX;
            self.y = self.y - dY;
        end
    end

end

function Ovella:draw()
    love.graphics.draw(self.sprite, self.x, self.y)
end

return Ovella