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|
-- 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, imageOffset = { x = 0, y = 0 } },
-- 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)
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
}
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