/ld26-basecode

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bzr branch http://9ix.org/bzr/ld26-basecode
1 by Josh C
zoetrope 1.4
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-- Class: Tile
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-- A tile repeats a single image across its dimensions. If you do
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-- not specify a width and height, the sprite will size itself so
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-- that it's exactly as big as its source image.
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--
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-- Extends:
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--		<Sprite>
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Tile = Sprite:extend
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{
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	-- Property: image
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	-- The image to tile across the sprite.
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	-- Property: imageOffset
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	-- Setting this moves the top-left corner of the tile inside
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	-- the sprite's rectangle. To draw as normal, set both x and y
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	-- to 0.
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	imageOffset = { x = 0, y = 0 },
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	-- private property: keeps track of properties that need action
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	-- to be taken when they are changed
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	-- image must be a nonsense value, not nil,
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	-- for the tile to see that an image has been set if it
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	-- was initially nil
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	_set = { image = -1 },
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	-- private property imageObj: actual Image instance used to draw
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	-- this is normally set via the image property, but you may set it directly
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	-- so long as you never change that image property afterwards.
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	new = function (self, obj)
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		obj = obj or {}
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		self:extend(obj)
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		obj._set.imageOffset = {}
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		if obj.image then obj:updateQuad() end
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		if obj.onNew then obj:onNew() end
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		return obj
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	end,
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	updateQuad = function (self)
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		if self.image then
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			self._imageObj = Cached:image(self.image)
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			if not self.width then self.width = self._imageObj:getWidth() end
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			if not self.height then self.height = self._imageObj:getHeight() end
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			self._quad = love.graphics.newQuad(self.imageOffset.x, self.imageOffset.y,
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											   self.width, self.height,
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											   self._imageObj:getWidth(), self._imageObj:getHeight())
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			self._imageObj:setWrap('repeat', 'repeat')
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			self._set.image = self.image
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			self._set.imageOffset.x = self.imageOffset.x
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			self._set.imageOffset.y = self.imageOffset.y
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		end
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	end,
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	draw = function (self, x, y)
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		if not self.visible or self.alpha <= 0 then return end
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		x = math.floor(x or self.x)
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		y = math.floor(y or self.y)
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		if STRICT then
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			assert(type(x) == 'number', 'visible tile does not have a numeric x property')
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			assert(type(y) == 'number', 'visible tile does not have a numeric y property')
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			assert(type(self.width) == 'number', 'visible tile does not have a numeric width property')
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			assert(type(self.height) == 'number', 'visible tile does not have a numeric height property')
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		end
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		if not self.image then return end
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		-- set color if needed
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		local colored = self.alpha ~= 1 or self.tint[1] ~= 1 or self.tint[2] ~= 1 or self.tint[3] ~= 1
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		if colored then
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			love.graphics.setColor(self.tint[1] * 255, self.tint[2] * 255, self.tint[3] * 255, self.alpha * 255)
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		end
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		-- if the source image or offset has changed, we need to recreate our quad
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		if self.image and (self.image ~= self._set.image or
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		   self.imageOffset.x ~= self._set.imageOffset.x or
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		   self.imageOffset.y ~= self._set.imageOffset.y) then
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			self:updateQuad()
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		end
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		-- draw the quad
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		local scaleX = self.scale * self.distort.x
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		local scaleY = self.scale * self.distort.y
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		if self.flipX then scaleX = scaleX * -1 end
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		if self.flipY then scaleY = scaleY * -1 end
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		love.graphics.drawq(self._imageObj, self._quad, x + self.width / 2, y + self.height / 2, self.rotation,
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							scaleX, scaleY, self.width / 2, self.height / 2)
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		-- reset color
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		if colored then
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			love.graphics.setColor(255, 255, 255, 255)
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		end
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	end,
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	__tostring = function (self)
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		local result = 'Tile (x: ' .. self.x .. ', y: ' .. self.y ..
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					   ', w: ' .. self.width .. ', h: ' .. self.height .. ', '
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		result = result .. 'image \'' .. self.image .. '\', '
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		if self.active then
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			result = result .. 'active, '
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		else
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			result = result .. 'inactive, '
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		end
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		if self.visible then
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			result = result .. 'visible, '
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		else
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			result = result .. 'invisible, '
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		end
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		if self.solid then
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			result = result .. 'solid'
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		else
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			result = result .. 'not solid'
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		end
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		return result .. ')'
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	end
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}