add momentum to sideways movement

drip.p8

@@ -13,7 +13,7 @@ end
 
 function _init()
   -- button-press initial delay
-  poke(0x5f5c, 2)
+  poke(0x5f5c, 1)
   -- button-press repeat
   poke(0x5f5d, 2)
   init_world()
@@ -25,16 +25,16 @@ function _update()
 end
 
 function update_player()
-  if (btn(0)) then
+  if btn(0) then
     player.x -= 1
   end
-  if (btn(1)) then
+  if btn(1) then
     player.x += 1
   end
-	 if (btn(2)) then
+	 if btn(2) then
 	   player.y -= 1
 	 end
-	 if (btn(3)) then
+	 if btn(3) then
 	   player.y += 1
 	 end
   if (player.y < 0) player.y = 0
@@ -46,6 +46,7 @@ function update_player()
     drop = {}
     drop.x = player.x
     drop.y = player.y
+    drop.momentum = 0
     found_drop = false
     for i=1,#drops do
       if (drops[i].x == player.x and drops[i].y == player.y) then
@@ -59,20 +60,44 @@ function update_player()
   end
 end
 
-function update_drop(drop)
-  drop.y += 1
-  return drop.y < 128
-end
-
 function update_drops()
-  new_drops = {}
+  cls()
+  draw_drops()
   for i=1,#drops do
-    result = update_drop(drops[i])
-    if result then
-      add(new_drops, drops[i])
+    drop = drops[i]
+    try_left = rnd() < 0.5
+    if drop.momentum == 0 then
+      if try_left then
+        drop.momentum = -1
+      else
+        drop.momentum = 1
       end
     end
-  drops = new_drops
+    if pget(drop.x, drop.y+1) == black then
+      drop.y += 1
+    elseif try_left and drop.x > 0 and
+        pget(drop.x-1, drop.y+1) == black then
+      drop.x -= 1
+      drop.y += 1
+	   elseif drop.x < 127 and
+        pget(drop.x+1, drop.y+1) == black then
+      drop.x += 1
+      drop.y += 1
+    elseif drop.momentum == -1 then
+      if drop.x > 0 and pget(drop.x-1, drop.y) == black then
+        drop.x -= 1
+      else
+        drop.momentum = 0
+      end
+    elseif drop.momentum == 1 then
+      if drop.x < 127 and pget(drop.x+1, drop.y) == black then
+        drop.x += 1
+      else
+        drop.momentum = 0
+      end
+	   end
+    if drop.y > 127 then drop.y = 127 end
+  end
 end
 
 function _draw()
@@ -89,6 +114,12 @@ end
 
 function draw_drops()
   foreach(drops,draw_drop)
+  circfill(94, 94, 3, green)
+  line(20, 20, 90, 60)
+  line(20, 21, 90, 61)
+  
+  print("hello there", 63, 63, yellow)
+  
 end
 
 function draw_drop(drop)