Day 196

jahmezz · Nov 30, 2017 · 36a33a8 · 36a33a8
1 parent b46dfe4
commit 36a33a8
Showing 1 changed file with 59 additions and 50 deletions.
diff --git a/pico8/toytrain/toytrain.p8 b/pico8/toytrain/toytrain.p8
@@ -3,6 +3,7 @@ version 14
 __lua__
 
 -- start state
+--train and switch_state are global
 function _init()
  cls()
  switch_state=0
@@ -12,11 +13,13 @@ end
 
 function move_segment(s,dir)
  spd=dir*2
+
+ -- move along edge of screen
  if(s[2]==8) --top side
  then
   if(s[1]==112) --top right
   then
-   s[2] += spd
+   s[2]+=spd
   else
    s[1]+=spd
   end
@@ -53,6 +56,7 @@ function move_segment(s,dir)
  end
 end
 
+--switch between 0 and 1
 function adv_switch()
  if(switch_state<1)
  then
@@ -76,6 +80,7 @@ function _update()
  move_train()
 end
 
+--iterate through parts and draw sprites
 function draw_train()
  local len=count(train)
  for t=1,len do
@@ -94,6 +99,7 @@ function draw_train()
  end
 end
 
+--on and off switch sprites
 function draw_switch()
  if(switch_state==1)
  then
@@ -104,43 +110,46 @@ function draw_switch()
 end
 
 function _draw()
+ --draw 16x16 sprites
+ --from top-left of screen
+ --(128x128 pixels)
  map(0,0,0,0,16,16)
  draw_switch()
  draw_train()
 end
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