initial commit

src/render/Camera.lua

@@ -0,0 +1,20 @@
+-- Camera centered on the player.  At the default 160x144 view this is
+-- the original framing (player sprite at screen tile (8,8) -> pixel
+-- (64, 60) after the -4px sprite offset); wider/taller world-pass views
+-- (window-filling survey on phones, wheel zoom-out) keep the player at
+-- the same relative center.
+
+local Camera = {}
+Camera.__index = Camera
+
+function Camera.new()
+  return setmetatable({ x = 0, y = 0 }, Camera)
+end
+
+function Camera:follow(px, py, viewW, viewH)
+  viewW, viewH = viewW or 160, viewH or 144
+  self.x = px - (viewW / 2 - 16)
+  self.y = py - (viewH / 2 - 8)
+end
+
+return Camera