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anim8.lua
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anim8.lua
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local anim8 = {
_VERSION = 'anim8 v2.3.0',
_DESCRIPTION = 'An animation library for LÖVE',
_URL = 'https://github.com/kikito/anim8',
_LICENSE = [[
MIT LICENSE
Copyright (c) 2011 Enrique García Cota
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]
}
local Grid = {}
local _frames = {}
local function assertPositiveInteger(value, name)
if type(value) ~= 'number' then error(("%s should be a number, was %q"):format(name, tostring(value))) end
if value < 1 then error(("%s should be a positive number, was %d"):format(name, value)) end
if value ~= math.floor(value) then error(("%s should be an integer, was %d"):format(name, value)) end
end
local function createFrame(self, x, y)
local fw, fh = self.frameWidth, self.frameHeight
return love.graphics.newQuad(
self.left + (x-1) * fw + x * self.border,
self.top + (y-1) * fh + y * self.border,
fw,
fh,
self.imageWidth,
self.imageHeight
)
end
local function getGridKey(...)
return table.concat( {...} ,'-' )
end
local function getOrCreateFrame(self, x, y)
if x < 1 or x > self.width or y < 1 or y > self.height then
error(("There is no frame for x=%d, y=%d"):format(x, y))
end
local key = self._key
_frames[key] = _frames[key] or {}
_frames[key][x] = _frames[key][x] or {}
_frames[key][x][y] = _frames[key][x][y] or createFrame(self, x, y)
return _frames[key][x][y]
end
local function parseInterval(str)
if type(str) == "number" then return str,str,1 end
str = str:gsub('%s', '') -- remove spaces
local min, max = str:match("^(%d+)-(%d+)$")
assert(min and max, ("Could not parse interval from %q"):format(str))
min, max = tonumber(min), tonumber(max)
local step = min <= max and 1 or -1
return min, max, step
end
function Grid:getFrames(...)
local result, args = {}, {...}
local minx, maxx, stepx, miny, maxy, stepy
for i=1, #args, 2 do
minx, maxx, stepx = parseInterval(args[i])
miny, maxy, stepy = parseInterval(args[i+1])
for y = miny, maxy, stepy do
for x = minx, maxx, stepx do
result[#result+1] = getOrCreateFrame(self,x,y)
end
end
end
return result
end
local Gridmt = {
__index = Grid,
__call = Grid.getFrames
}
local function newGrid(frameWidth, frameHeight, imageWidth, imageHeight, left, top, border)
assertPositiveInteger(frameWidth, "frameWidth")
assertPositiveInteger(frameHeight, "frameHeight")
assertPositiveInteger(imageWidth, "imageWidth")
assertPositiveInteger(imageHeight, "imageHeight")
left = left or 0
top = top or 0
border = border or 0
local key = getGridKey(frameWidth, frameHeight, imageWidth, imageHeight, left, top, border)
local grid = setmetatable(
{ frameWidth = frameWidth,
frameHeight = frameHeight,
imageWidth = imageWidth,
imageHeight = imageHeight,
left = left,
top = top,
border = border,
width = math.floor(imageWidth/frameWidth),
height = math.floor(imageHeight/frameHeight),
_key = key
},
Gridmt
)
return grid
end
-----------------------------------------------------------
local Animation = {}
local function cloneArray(arr)
local result = {}
for i=1,#arr do result[i] = arr[i] end
return result
end
local function parseDurations(durations, frameCount)
local result = {}
if type(durations) == 'number' then
for i=1,frameCount do result[i] = durations end
else
local min, max, step
for key,duration in pairs(durations) do
assert(type(duration) == 'number', "The value [" .. tostring(duration) .. "] should be a number")
min, max, step = parseInterval(key)
for i = min,max,step do result[i] = duration end
end
end
if #result < frameCount then
error("The durations table has length of " .. tostring(#result) .. ", but it should be >= " .. tostring(frameCount))
end
return result
end
local function parseIntervals(durations)
local result, time = {0},0
for i=1,#durations do
time = time + durations[i]
result[i+1] = time
end
return result, time
end
local Animationmt = { __index = Animation }
local nop = function() end
local function newAnimation(frames, durations, onLoop)
local td = type(durations);
if (td ~= 'number' or durations <= 0) and td ~= 'table' then
error("durations must be a positive number. Was " .. tostring(durations) )
end
onLoop = onLoop or nop
durations = parseDurations(durations, #frames)
local intervals, totalDuration = parseIntervals(durations)
return setmetatable({
frames = cloneArray(frames),
durations = durations,
intervals = intervals,
totalDuration = totalDuration,
onLoop = onLoop,
timer = 0,
position = 1,
status = "playing",
flippedH = false,
flippedV = false
},
Animationmt
)
end
function Animation:clone()
local newAnim = newAnimation(self.frames, self.durations, self.onLoop)
newAnim.flippedH, newAnim.flippedV = self.flippedH, self.flippedV
return newAnim
end
function Animation:flipH()
self.flippedH = not self.flippedH
return self
end
function Animation:flipV()
self.flippedV = not self.flippedV
return self
end
local function seekFrameIndex(intervals, timer)
local high, low, i = #intervals-1, 1, 1
while(low <= high) do
i = math.floor((low + high) / 2)
if timer > intervals[i+1] then low = i + 1
elseif timer <= intervals[i] then high = i - 1
else
return i
end
end
return i
end
function Animation:update(dt)
if self.status ~= "playing" then return end
self.timer = self.timer + dt
local loops = math.floor(self.timer / self.totalDuration)
if loops ~= 0 then
self.timer = self.timer - self.totalDuration * loops
local f = type(self.onLoop) == 'function' and self.onLoop or self[self.onLoop]
f(self, loops)
end
self.position = seekFrameIndex(self.intervals, self.timer)
end
function Animation:pause()
self.status = "paused"
end
function Animation:gotoFrame(position)
self.position = position
self.timer = self.intervals[self.position]
end
function Animation:pauseAtEnd()
self.position = #self.frames
self.timer = self.totalDuration
self:pause()
end
function Animation:pauseAtStart()
self.position = 1
self.timer = 0
self:pause()
end
function Animation:resume()
self.status = "playing"
end
function Animation:draw(image, x, y, r, sx, sy, ox, oy, kx, ky)
love.graphics.draw(image, self:getFrameInfo(x, y, r, sx, sy, ox, oy, kx, ky))
end
function Animation:getFrameInfo(x, y, r, sx, sy, ox, oy, kx, ky)
local frame = self.frames[self.position]
if self.flippedH or self.flippedV then
r,sx,sy,ox,oy,kx,ky = r or 0, sx or 1, sy or 1, ox or 0, oy or 0, kx or 0, ky or 0
local _,_,w,h = frame:getViewport()
if self.flippedH then
sx = sx * -1
ox = w - ox
kx = kx * -1
ky = ky * -1
end
if self.flippedV then
sy = sy * -1
oy = h - oy
kx = kx * -1
ky = ky * -1
end
end
return frame, x, y, r, sx, sy, ox, oy, kx, ky
end
function Animation:getDimensions()
local _,_,w,h = self.frames[self.position]:getViewport()
return w,h
end
-----------------------------------------------------------
anim8.newGrid = newGrid
anim8.newAnimation = newAnimation
return anim8