Separate logic into class files

ball.lua

@@ -0,0 +1,56 @@
+ball = {
+	__count = 0,
+	id = nil,
+	pos = vec2:new(0,0),
+	vel = vec2:new(0,0),
+	rad = 1,
+	col = 7,
+	
+	draw = function(self)
+		circfill(self.pos.x, self.pos.y, self.rad, self.col)
+	end,
+	
+	move = function(self)
+		self.pos += self.vel
+	end,
+	
+	edge_bounce = function(self)
+		edge_normal = vec2:new()
+		for axis in all({"x","y"}) do
+			val = self.pos[axis]
+			if (val - self.rad < 0) then
+				self.pos[axis] = self.rad
+				edge_normal[axis] = 1
+			elseif (val + self.rad > 127) then
+				self.pos[axis] = 127 - self.rad
+				edge_normal[axis] = -1
+			end 
+		end
+		if (edge_normal.x != 0 or edge_normal.y != 0) then
+			self.vel = self.vel:bounce(edge_normal)
+		end
+	end,
+	
+	check_collisions = function(self, balls)
+		for b in all(balls) do
+			if (b.id != self.id and (collisions[b] == nil or collisions[b][self] == nil)) then
+				local diff = self.pos - b.pos
+				if ((diff):mag() < self.rad + b.rad) then
+				 collisions[self] = collisions[self] or {}
+				 collisions[self][b] = diff
+				end
+			end
+		end
+	end,
+}
+ball.__index = ball
+
+function ball:new(o)
+	ball.__count += 1
+	local o = o or {}
+	o.id = ball.__count
+	o.col = o.id % 16
+	setmetatable(o, self)
+	o.__index = self
+	return o
+end