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--- notes:comporg:spring2025:projects:mtb2 [2025/02/24 23:47] – [score display] cgrant9
+++ notes:comporg:spring2025:projects:mtb2 [2025/02/28 05:03] (current) – [score storage] bdildine
@@ Line 6: / Line 6: @@
 For our purposes, we can check if the ball's x position has exceeded 640 or subceeded 0
 ====score storage====
+You can store the score and other variables you may use such as x and y positions to locations in memory by defining it, for example:
+<code>
+%define LScore    0x00000000
+</code>
+You can then load each score into a register before use so you can use the same score tracking function for both the right and left players scores by loading different scores before calling the function.
 ====score display====
 Displaying the player's scores is where things start to get more complex, as we no longer have built in 'itoa' or 'print' functions, so we will have to build them manually.
@@ Line 61: / Line 65: @@
 ====determining computer paddle movement====
+The simplest version of a computer operated player has the bot moving the paddle to the same vertical position as the ball.
+First we need to get the difference in position between the paddle and the ball.
+*NOTE* we want the center of the paddle to hit the center of the ball, so we must make sure to compensate for the distance between the hotpots and centers of the paddle
+This will tell us the direction and magnitude the paddle should move, but we will want to cap the movement speed of the paddle so the bot isn't too good.
+We can also add a small multiplier to further limit the movement of the bot.
+<code>
+_npcMovement:
+   ;RY is the register containing the ball's y pos
+   ;RP is the register containing the paddles y pos
+   ;RT is a temporary register
+   mov   RT,   RY    ;Store a copy of the ball's ypos
+   isub  RT,   RP    ;Get the difference in position
+   iadd  RT,   20    ;Compensate for any differences in sizes
+   imul  RT,    2    ;Optional slow down on bot movement
+   idiv  RT,    3    ;This will make the bot 2/3 the responsive
+   imax  RT,  -10    ;Limit the speed to -5 pixels and 5 pixels
+   imin  RT,   10
+   iadd  RP,   RT    ;Move the bot's paddle acordingly
+   RET
+</code>
 ====difficulty of computer player====
+The difficulty of the computer can be tuned by changing the max speed and responsiveness during their movement step
+Another way to increase difficulty is to have the ball move faster or have a smaller paddle. You could also give the computer player a larger paddle.

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