Add loading for aseprite files; animated sprites

1 files changed, 53 insertions, 0 deletions

diff --git a/src/sprite.lua b/src/sprite.lua
new file mode 100644
index 0000000..b7a7541
--- /dev/null
+++ b/src/sprite.lua
@@ -0,0 +1,53 @@
+Sprite = {}
+Sprite.__index = Sprite
+
+function Sprite.new(tex_name)
+  local self = setmetatable({}, Sprite)
+
+  self.tex = get_tex(tex_name)
+  self.anim = get_anim(tex_name)
+
+  self.active_tag = self.anim.default_tag
+  self.frame = self.anim.tags[self.active_tag].from
+
+  self.timer = 0
+
+  local width, height = self.tex:getDimensions()
+  self.width = width / self.anim.frame_count
+  self.height = height
+
+  return self
+end
+
+register_comp("Sprite", function(ent, tex_name)
+  ent.sprite = Sprite.new(tex_name)
+end)
+
+function sprite_anim_sys(ent, dt)
+  local sprite = ent.sprite
+  local tag = sprite.anim.tags[sprite.active_tag]
+
+  sprite.timer = sprite.timer + dt
+  if sprite.timer > tag.duration then
+    sprite.frame = sprite.frame + 1
+    sprite.timer = 0
+  end
+
+  if sprite.frame >= tag.to then
+    sprite.frame = tag.from
+  end
+  if sprite.frame < tag.from then
+    sprite.frame = tag.from
+  end
+end
+
+function sprite_draw_sys(ent)
+  local sprite = ent.sprite
+
+  local q = lg.newQuad(
+    sprite.width * sprite.frame, 0,
+    sprite.width, sprite.height,
+    sprite.tex:getDimensions()
+  )
+  lg.draw(sprite.tex, q, ent.x or 0, ent.y or 0)
+end