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--- `Sprite`
-- Abstract class for drawable animated entities.
Sprite = {
animations =--[[table with animations]]nil,
current =--[[animations.default]]nil,
image =--[[love.graphics.newImage]]nil,
frame = 1,
delay = .1,
}
Sprite.__index = Sprite
--[[ Constructor of `Sprite`.
function Sprite:new (imagePath)
local o = setmetatable({}, self)
o:init(imagePath)
return o
end
]]
-- Cleans up reference to image on deletion.
function Sprite:delete ()
self.image = nil
end
-- Initializes new Sprite instance.
function Sprite:init (imagePath)
if type(imagePath) == "string" then
self:setImage(Sprite.newImage(imagePath))
end
end
-- Creates new Image object from path. Key-colours two shades of green. Static.
function Sprite.newImage (path)
local imagedata = love.image.newImageData(path)
local transparency = function(x, y, r, g, b, a)
if (r == 0 and g == 128 and b == 64) or
(r == 0 and g == 240 and b == 6) then
a = 0
end
return r, g, b, a
end
imagedata:mapPixel(transparency)
local image = love.graphics.newImage(imagedata)
return image
end
-- Sets an Image as an image.
function Sprite:setImage (image)
self.image = image
end
-- Returns current image Image.
function Sprite:getImage ()
return self.image
end
-- Sets new animations list.
function Sprite:setAnimationsList (t)
if t then
self.animations = t
self:setAnimation("default")
end
end
-- Sets current animation by table key.
function Sprite:setAnimation (animation)
self.frame = 1
self.delay = Sprite.delay -- INITIAL from metatable
self.current = self.animations[animation]
end
-- Returns current animation table.
function Sprite:getAnimation ()
return self.current
end
-- Get frame quad for drawing.
function Sprite:getQuad ()
if self.animations and self.current then
return self.current[self.frame]
end
end
-- TODO: Following five methods are stupid, do something about them!
-- Sprite can't be moved by itself. Positioning should be handled by children's methods.
function Sprite:getPosition ()
return 0,0
end
-- Sprite can't be rotated by itself. Rotation should be handled by children's methods.
function Sprite:getAngle ()
return 0
end
-- Sprite can't be mirrored by itself. Mirroring should be handled by children's methods.
function Sprite:getHorizontalMirror ()
return 1
end
function Sprite:getVerticalMirror ()
return 1
end
-- Sprite can't be offset by itself. Offsetting should be handled by children's methods.
function Sprite:getOffset ()
return 0,0
end
-- Drawing self to LOVE2D buffer.
-- If there is no Quad, it will draw entire image. It won't draw anything if there is no image.
-- TODO: it doesn't follow same pattern as `not.Hero.draw`. It should implement so it can be called from `not.World`.
-- TODO: change children if above changes are in effect: `not.Platform`, `not.Decoration`.
function Sprite:draw (offset_x, offset_y, scale)
local offset_x = offset_x or 0
local offset_y = offset_y or 0
local i, q = self:getImage(), self:getQuad()
local x, y = self:getPosition()
local angle = self:getAngle()
local scaleX = self:getHorizontalMirror()*(scale or 1)
local scaleY = self:getVerticalMirror()*(scale or 1)
-- pixel grid ; `approx` selected to prevent floating characters on certain conditions
local approx = math.floor
if (y - math.floor(y)) > 0.5 then approx = math.ceil end
local draw_y = (approx(y) + offset_y) * scale
local draw_x = (math.floor(x) + offset_x) * scale
if i then
love.graphics.setColor(255,255,255,255)
if q then
love.graphics.draw(i, q, draw_x, draw_y, angle, scaleX, scaleY, self:getOffset())
else
love.graphics.draw(i, draw_x, draw_y, angle, scaleX, scaleY, self:getOffset())
end
end
end
-- Animation updating.
function Sprite:update (dt)
if self.animations and self.current then
self.delay = self.delay - dt
if self.delay < 0 then
self.delay = self.delay + Sprite.delay -- INITIAL from metatable
self:goToNextFrame()
end
end
end
-- Moving to the next frame.
function Sprite:goToNextFrame ()
if self.current.repeated or not (self.frame == self.current.frames) then
self.frame = (self.frame % self.current.frames) + 1
else
self:setAnimation("default")
end
end
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