Fixes

aabb.p8

@@ -3,7 +3,7 @@ version 42
 __lua__
 local player = {
   -- position
-  x = 64,
+  x = 67,
   y = 80,
 
   -- velocity
@@ -15,23 +15,23 @@ local player = {
     self.dy = self.dy + 1
     self.dy = min(self.dy, 10)
 
-    -- collision right
-    if self.dx > 0 and (isColliding(self.x + self.dx + 7, self.y) or isColliding(self.x + self.dx + 7, self.y + 7)) then
-      self.dx = 0
-    end
     -- collision left
     if self.dx < 0 and (isColliding(self.x + self.dx, self.y) or isColliding(self.x + self.dx, self.y + 7)) then
       self.dx = 0
     end
-
-    -- collision down
-    if self.dy > 0 and (isColliding(self.x, self.y + self.dy + 7) or isColliding(self.x + 7, self.y + self.dy + 7)) then
-      self.dy = 0
+    -- collision right
+    if self.dx > 0 and (isColliding(self.x + self.dx + 7, self.y) or isColliding(self.x + self.dx + 7, self.y + 7)) then
+      self.dx = 0
     end
+
     -- collision up
     if self.dy < 0 and (isColliding(self.x, self.y + self.dy) or isColliding(self.x + 7, self.y + self.dy)) then
       self.dy = 0
     end
+    -- collision down
+    if self.dy > 0 and (isColliding(self.x, self.y + self.dy + 7) or isColliding(self.x + 7, self.y + self.dy + 7)) then
+      self.dy = 0
+    end
 
     -- apply movement
     self.x = self.x + self.dx

aabb2.p8

@@ -3,7 +3,7 @@ version 42
 __lua__
 local player = {
   -- position
-  x = 64,
+  x = 67,
   y = 50,
 
   -- velocity
@@ -16,20 +16,17 @@ local player = {
     -- cap the falling speed to 7px/frame
     self.dy = min(self.dy, 7)
 
-    -- collision right
-    if self.dx > 0 and (isColliding(self.x + self.dx + 7, self.y) or isColliding(self.x + self.dx + 7, self.y + 7)) then
-      self.dx = 0
-    end
     -- collision left
     if self.dx < 0 and (isColliding(self.x + self.dx, self.y) or isColliding(self.x + self.dx, self.y + 7)) then
+      -- move the player against the left wall
+      self.x = self.x % 8 == 0 and self.x or flr(self.x / 8) * 8
       self.dx = 0
     end
-
-    -- collision down
-    if self.dy > 0 and (isColliding(self.x, self.y + self.dy + 7) or isColliding(self.x + 7, self.y + self.dy + 7)) then
-      -- clip the player to the nearest block down
-      self.y = self.y % 8 == 0 and self.y or flr((self.y + 8) / 8) * 8
-      self.dy = 0
+    -- collision right
+    if self.dx > 0 and (isColliding(self.x + self.dx + 7, self.y) or isColliding(self.x + self.dx + 7, self.y + 7)) then
+      -- move the player against the right wall
+      self.x = self.x % 8 == 0 and self.x or flr((self.x + 8) / 8) * 8
+      self.dx = 0
     end
     -- collision up
     if self.dy < 0 and (isColliding(self.x, self.y + self.dy) or isColliding(self.x + 7, self.y + self.dy)) then
@@ -37,6 +34,22 @@ local player = {
       self.y = self.y % 8 == 0 and self.y or flr(self.y / 8) * 8
       self.dy = 0
     end
+    -- collision down
+    if self.dy > 0 and (isColliding(self.x, self.y + self.dy + 7) or isColliding(self.x + 7, self.y + self.dy + 7)) then
+      -- align the player with the nearest block down
+      self.y = self.y % 8 == 0 and self.y or flr((self.y + 8) / 8) * 8
+      self.dy = 0
+    end
+
+    -- diagonals
+    if self.dx ~= 0 and self.dy ~= 0 and isCollidingRect(self.x + self.dx, self.y + self.dy) then
+      self.dx = 0
+      self.dy = 0
+      -- align with the current cell
+      self.x = flr(self.x / 8) * 8
+      self.y = flr(self.y / 8) * 8
+      printh(self.x .. ", " .. self.y)
+    end
 
     -- apply movement
     self.x = self.x + self.dx
@@ -52,6 +65,14 @@ function isColliding(x, y)
   return fget(mget(flr(x / 8), flr(y / 8)), 0)
 end
 
+-- same as isColliding(), but will check the 4 corners at once
+function isCollidingRect(x, y)
+  return isColliding(x, y)
+      or isColliding(x + 7, y)
+      or isColliding(x, y + 7)
+      or isColliding(x + 7, y + 7)
+end
+
 function getBlockCoords(x, y)
   return flr(x / 8) * 8, flr(y / 8) * 8
 end
@@ -62,12 +83,12 @@ end
 function _update()
   --left
   if btn(0) then
-    player.dx = -1
+    player.dx = -2
   end
 
   -- right
   if btn(1) then
-    player.dx = 1
+    player.dx = 2
   end
 
   -- Up