gob.lua

Gob = {
    x = 0,
    y = 0,
    angle = 0,
    time = 0.0,
    fps = 12,
    sprite = nil,
    currentFrame = 1,
    alive = true,
    visible = true,
}

function Gob:new(data)
    o = {}
    setmetatable(o, self)
    self.__index = self

    if data then
        for k, v in pairs(data) do
            o[k] = v
        end
    end

    return o
end

function Gob:draw()
    if (not self.visible) then
        return
    end

    local sprite = self.sprite
    love.graphics.setColor(255, 255, 255, sprite.opacity * 255)
    if (sprite.anim) then
        love.graphics.drawq(
            sprite.image,
            sprite.anim.quads[self.currentFrame],
            self.x, self.y, -self.angle,
            sprite.scale.x, sprite.scale.y, sprite.center.x, sprite.center.y)
    else
        love.graphics.draw(
            sprite.image,
            self.x, self.y, -self.angle,
            sprite.scale.x, sprite.scale.y, sprite.center.x, sprite.center.y)
    end
end

function Gob:drawHitbox()
    if (not self.alive) then
        return
    end

    local s = self.sprite
    if (s) then
        love.graphics.setColor(255, 255, 0)
        love.graphics.rectangle(
            "line", self.x, self.y, self:getWidth(), self:getHeight())
        love.graphics.setColor(0, 255, 255)
        love.graphics.rectangle(
            "line", self.x + s.hitbox.x, self.y + s.hitbox.y,
            s.hitbox.w, s.hitbox.h)
    end
end

function Gob:getWidth()
    return self.sprite:getWidth()
end

function Gob:getHeight()
    return self.sprite:getHeight()
end

function Gob:update(dt)
    for k,v in ipairs(getmetatable(self)) do
        print(k .. ": " .. v)
    end

    self.time = self.time + dt
    if (self.sprite.anim) then
        self.currentFrame = (math.floor(self.time * self.fps) % self.sprite.anim.count) + 1
    end
end

function Gob:hitGob(obj)
    if (not self.alive or not obj.alive) then
        return false
    end

    return rectsIntersect(
        self:getWorldSpaceBbox(),
        obj:getWorldSpaceBbox())
end

function Gob:getWorldSpaceBbox()
    local sprite = self.sprite
    local ul_x = self.x + sprite.hitbox.x - sprite.center.x
    local ul_y = self.y + sprite.hitbox.y - sprite.center.y
    local br_x = ul_x + sprite.hitbox.w
    local br_y = ul_y + sprite.hitbox.h
    return { ul_x = ul_x, ul_y = ul_y, br_x = br_x, br_y = br_y }
end

function rectsIntersect(rect1, rect2)
    return not (rect1.ul_x > rect2.br_x or rect1.br_x < rect2.ul_x or rect1.ul_y > rect2.br_y or rect1.br_y < rect2.ul_y)
end