ball.lua - implement a random visiting ball

ball.lua

@@ -0,0 +1,23 @@
+local mkHopper = require "hopper"
+local dirs = {"se", "sw", "ne", "nw"}
+local height = 10;
+
+return function(arena)
+   local self
+   local function update(dt, se, sw)
+      if se+sw >= arena.getSize() then
+	 self.dead = true
+	 return
+      end
+      
+      local dir = dirs[math.random(2)]
+      self.jump(dir)
+   end
+   local function draw(x, y )
+      love.graphics.setColor(128,0,0);
+      love.graphics.circle("fill", x, y, height)
+   end
+   
+   self = mkHopper(arena, draw, update)
+   return self
+end

main.lua

@@ -1,6 +1,7 @@
 
 local mkArena = require "arena"
 local mkQbert = require "qbert"
+local mkBall = require "ball"
 
 local arena = mkArena(
    7,
@@ -27,6 +28,12 @@ end
 
 function love.update(dt)
 
+   time = time + dt
+   if time > 10 then
+      time = 0
+      table.insert(mobs, mkBall(arena))
+   end
+   
    if love.keyboard.isDown('i') then
       qbert.jump('ne')
    end