How to make simple A.I and collision in a pong clone

[Biphe]

So I am trying to get the computer controlled pong player to follow the pong, also i am trying to get the pong to move, and I would like to know how to make a pong collision without using the complicated box2d physics engine.

The file is included below and thanks for your help! ^-^

[mcjohnalds45]

First of all, to move the computer's paddle up and down, you can check if the pong is above the computers paddle and if it is move it up, then check if the pong is below the computers paddle and if it is move it down.

Code: Select all

if pong.y > computer.y + (computer.width / 2) then
	computer.y = computer.y + (computer.speed * dt)
end

if pong.y < computer.y + (computer.width / 2) then
	computer.y = computer.y - (computer.speed * dt)
end
-- the "+ (computer.width / 2)" is to check if the pong is above or below the centre of the paddle rather than the top

Getting the pong to move is a simple as two lines.

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pong.x = pong.x + (pong.speed * dt)
pong.y = pong.y + (pong.speed * dt)

Then to check if the pong is colliding width one of the paddles you can use this function that checks if the one rectangle is intersecting another.

Code: Select all

function collision(X1, Y1, W1, H1, X2, Y2, W2, H2)
	if X1 > X2 + W2 then
		return false
	end
	
	if X1 + W1 < X2 then
		return false
	end
	
	if Y1 > Y2 + H2 then
		return false
	end
	
	if Y1 + H1 < Y2 then
		return false
	end
	
	return true
end

Example Usage.

Code: Select all

if collision(player.x, player.y, player.width, player.height, pong.x, pong.y, pong.size, pong.size) then
	print("bazinga")
end

Finally i'd suggest making the ball move a little faster than the computer at some point or the computer will never lose.

[Biphe]

Thank you I never thought of that.