1 files changed, 68 insertions, 0 deletions
diff --git a/animation.lua b/animation.lua
new file mode 100644
index 0000000..7d77d40
--- /dev/null
+++ b/animation.lua
@@ -0,0 +1,68 @@
+local Animation = {}
+Animation.__index = Animation
+
+function Animation.new(imageOrPath, width, height, duration)
+  local self = setmetatable({}, Animation)
+  
+  if type(imageOrPath) == "string" then
+    self.spriteSheet = love.graphics.newImage(imageOrPath)
+  else
+    self.spriteSheet = imageOrPath
+  end
+  
+  self.frameWidth = width
+  self.frameHeight = height
+  self.quads = {}
+  
+  local imgW, imgH = self.spriteSheet:getDimensions()
+  for y = 0, imgH - height, height do
+    for x = 0, imgW - width, width do
+      table.insert(self.quads, love.graphics.newQuad(x, y, width, height, imgW, imgH))
+    end
+  end
+  
+  self.duration = duration or 1
+  self.currentTime = 0
+  
+  return self
+end
+
+function Animation:update(dt)
+  self.currentTime = self.currentTime + dt
+  if self.looping == false then
+    if self.currentTime > self.duration then
+      self.currentTime = self.duration
+    end
+  else
+    if self.currentTime >= self.duration then
+      self.currentTime = self.currentTime % self.duration
+    end
+  end
+end
+
+function Animation:reset()
+  self.currentTime = 0
+end
+
+-- Returns true only for non-looping animations that have played through once.
+function Animation:isFinished()
+  return self.looping == false and self.currentTime >= self.duration
+end
+
+function Animation:draw(x, y, flipHorizontal)
+  if #self.quads == 0 then return end
+  
+  local t = self.currentTime / self.duration
+  local index = math.floor(t * #self.quads) + 1
+  if index > #self.quads then index = #self.quads end
+  
+  local quad = self.quads[index]
+  local sx = (flipHorizontal and -1) or 1
+  local sy = 1
+  local ox = flipHorizontal and self.frameWidth or 0
+  local oy = 0
+  
+  love.graphics.draw(self.spriteSheet, quad, x, y, 0, sx, sy, ox, oy)
+end
+
+return Animation