/ld26-basecode

-- Class: Tile

-- A tile repeats a single image across its dimensions. If you do

-- not specify a width and height, the sprite will size itself so

-- that it's exactly as big as its source image.

--

-- Extends:

--		<Sprite>

Tile = Sprite:extend

{

	-- Property: image

	-- The image to tile across the sprite.

	-- Property: imageOffset

	-- Setting this moves the top-left corner of the tile inside

	-- the sprite's rectangle. To draw as normal, set both x and y

	-- to 0.

	imageOffset = { x = 0, y = 0 },

	-- private property: keeps track of properties that need action

	-- to be taken when they are changed

	-- image must be a nonsense value, not nil,

	-- for the tile to see that an image has been set if it

	-- was initially nil

	_set = { image = -1 },

	-- private property imageObj: actual Image instance used to draw

	-- this is normally set via the image property, but you may set it directly

	-- so long as you never change that image property afterwards.

	new = function (self, obj)

		obj = obj or {}

		self:extend(obj)

		obj._set.imageOffset = {}

		if obj.image then obj:updateQuad() end

		if obj.onNew then obj:onNew() end

		return obj

	end,

	updateQuad = function (self)

		if self.image then

			self._imageObj = Cached:image(self.image)

			if not self.width then self.width = self._imageObj:getWidth() end

			if not self.height then self.height = self._imageObj:getHeight() end

			self._quad = love.graphics.newQuad(self.imageOffset.x, self.imageOffset.y,

											   self.width, self.height,

											   self._imageObj:getWidth(), self._imageObj:getHeight())

			self._imageObj:setWrap('repeat', 'repeat')

			self._set.image = self.image

			self._set.imageOffset.x = self.imageOffset.x

			self._set.imageOffset.y = self.imageOffset.y

		end

	end,

	draw = function (self, x, y)

		if not self.visible or self.alpha <= 0 then return end

		x = math.floor(x or self.x)

		y = math.floor(y or self.y)

		if STRICT then

			assert(type(x) == 'number', 'visible tile does not have a numeric x property')

			assert(type(y) == 'number', 'visible tile does not have a numeric y property')

			assert(type(self.width) == 'number', 'visible tile does not have a numeric width property')

			assert(type(self.height) == 'number', 'visible tile does not have a numeric height property')

		end

		if not self.image then return end

		-- set color if needed

		local colored = self.alpha ~= 1 or self.tint[1] ~= 1 or self.tint[2] ~= 1 or self.tint[3] ~= 1

		if colored then

			love.graphics.setColor(self.tint[1] * 255, self.tint[2] * 255, self.tint[3] * 255, self.alpha * 255)

		end

		-- if the source image or offset has changed, we need to recreate our quad

		if self.image and (self.image ~= self._set.image or

		   self.imageOffset.x ~= self._set.imageOffset.x or

		   self.imageOffset.y ~= self._set.imageOffset.y) then

			self:updateQuad()

		end

		-- draw the quad

		local scaleX = self.scale * self.distort.x

		local scaleY = self.scale * self.distort.y

		if self.flipX then scaleX = scaleX * -1 end

		if self.flipY then scaleY = scaleY * -1 end

		love.graphics.drawq(self._imageObj, self._quad, x + self.width / 2, y + self.height / 2, self.rotation,

							scaleX, scaleY, self.width / 2, self.height / 2)

		-- reset color

		if colored then

			love.graphics.setColor(255, 255, 255, 255)

		end

	end,

	__tostring = function (self)

		local result = 'Tile (x: ' .. self.x .. ', y: ' .. self.y ..

					   ', w: ' .. self.width .. ', h: ' .. self.height .. ', '

		result = result .. 'image \'' .. self.image .. '\', '

		if self.active then

			result = result .. 'active, '

		else

			result = result .. 'inactive, '

		end

		if self.visible then

			result = result .. 'visible, '

		else

			result = result .. 'invisible, '

		end

		if self.solid then

			result = result .. 'solid'

		else

			result = result .. 'not solid'

		end

		return result .. ')'

	end

}