Make the A.I Paddle follow the ball

[Velocity]

What is it you are trying to achieve?
I aim to make the A.I Paddle follow the ball so that it never goes below it.

What is the problem you are having?
I am unable to make the paddle move first of all but i think this is just the same step as making it follow the ball so i want to make it follow the ball.


Describe what you have tried to solve this problem
making if statements for if the paddle is greater than this location paddle -= 10 and if it is less than this location it goes += 10, it doesnt move, it stays still

Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)

Turing:

if ball_y2 >= maxy - 50 then             ball_directiony2 *= -1         end if         if ball_x2 >= maxx div 2 + 40 then             ball_directionx2 *= -1         end if         if ball_x2 <= maxx - 40  then             ball_directionx2 *= -1         end if         var direction1 : int         ball_x2 += (ball_directionx2 * ball_speed)         ball_y2 += (ball_directiony2 * ball_speed)         if ball_x2 <= x2_2 and ball_y2 <= y2_2 + 15 and ball_x2 >= x1_1 and ball_y2 >= y1_1 + 15 then             ball_directiony2 *= -1 end if %%% above is my syntax to make my ball move % I want to know how to make the paddle :     x1_1 := 750     y1_1 := 25     x2_2 := 850     y2_2 := 50     drawfillbox (x1_1, y1_1, x2_2, y2_2, 131) % follow the ball and the collision part i got covered.

Please specify what version of Turing you are using
4.1.1a

[Velocity]

+ karma for help, need to make it in the next 10mins

[RandomLetters]

If you want it to follow the ball, then you will need to use the ball's coordinates somehow.

A simple way is to just draw the paddle where the ball is

x1 = 10
x2 = 20
y1 = by + 10
y2 = by - 10

better (beatable way) is to check the location of the paddle, compare it to the location of the ball, and move appropriately

for example,
y = 0

if deltay > max then //check if the paddle is above the ball and set it to move down
v = -1
end if

y += v
y1= y + 10
y2 = y - 10

[Zren]

So much hardcoding... If you use a number more than once for a specific value (Eg: ball radius, ball speed, paddle speed) then you should make a variable or constant for it. Actually, you should always use a variable to describe 'magic numbers' even if you only use the variable once. It makes the code more readable.

Building on what Rand was talking about:
You also need to take into account when the object's destination is within the movement speed. Otherwise you'll get a jittery effect as one frame it's on the left, next on the right, etc.

Turing:

var delta := ball.pos.x - paddle.pos.x % d = p2 - p1 if abs (delta) <= paddle.speed then     % Will reach destination this tick.     paddle.nextPos.x := ball.pos.x elsif delta > 0 then     % Destination is to the right     paddle.nextPos.x := paddle.pos.x + paddle.speed elsif delta < 0 then     % Destination is to the left     paddle.nextPos.x := paddle.pos.x - paddle.speed end if

[Velocity]

zren i implemented your code into my program and changed the co-ords around a little, and the a.i paddle moves where the ball is but it only twitches like + 5 on the co-ord that way... so it doesnt exactly follow it only + 5 out of 100, this is how i put your code in :

var paddle_speed : int := 5
var shadower := ball_x2 - x2_2
if abs (shadower) <= paddle_speed then
x2_2 := ball_x2
x1_1 := ball_x2
elsif shadower > 100 then
x1_1 := x1_1 + paddle_speed + 100
x1_1 := x2_2 - paddle_speed - 100
elsif shadower < 100 then
x2_2 := x1_1 - paddle_speed - 100
x2_2 := x1_1 + paddle_speed + 100
end if

[Velocity]

This changed the paddle speed but ithen the paddle moves and it gets to the maxx and disappears

var paddle_speed : int := 50
var shadower := ball_x2 - x2_2
if abs (shadower) <= paddle_speed then
x2_2 := ball_x2
x1_1 := ball_x2
elsif shadower > 100 then
x1_1 := x1_1 + paddle_speed + 200
elsif shadower < 100 then
x2_2 := x1_1 - paddle_speed - 100
end if

[Insectoid]

You're severely over-complicating this.

code:

if ball_y < paddle_y then     move_paddle_down else if ball_y > paddle_y then     move_paddle_up end if

It's that simple.

[Velocity]

insectoid thank you so much that helped alot! +karma

[Velocity]

if ball_y2 > x1_1 then
x2_2 += 10
x1_1 += 10
elsif ball_y2 < x1_1 then
x2_2 -= 10
x1_1 -= 10
end if

insectoid i used your code but for some reason with these boundaries of my paddle

if x2_2 > maxx - 31 and x1_1 < maxx - 131 then
x1_1 -= 10
x2_2 -= 10
elsif x2_2 < maxx div 2 + 131 and x1_1 > maxx div 2
+ 31 then
x1_1 += 10
x2_2 += 10
end if

the paddle goes to the left and then even when the ball moves right the paddle trys to move right but stays on the left.

[Dreadnought]

Is it intended that you're comparing the y-coordinate of the ball with the x coordinate of the paddle?

[Insectoid]

The paddle doesn't even need an X variable, since it only goes up and down.

[Velocity]

mine goes left and right

[Velocity]

its not pong, its brick breaker. Please help me to know where i went wrong

[RandomLetters]

Then why are you comparing the y values of the paddle?

[Velocity]

X1-1 is the first x co'ord of the paddle
X2-2 is the second x co'ord of the paddle
Ball-y2 is the y co'ord of the a.i ball

Nowhere in the code does it say the y co'ord of the paddle

X1-1 is where the drawfill box starts
X2-2 is where it ends

How do i get my paddle to follow the ball properly, the code i prompted it with worked but when my code starts the a.i paddle goes to the left and trys to go right but a force blocks it and it doesnt. Would you feel more comfortable with my question if i provided the code for my actual game?