Collisions EEK

Heyas,

Here's some code I'm playing with... Bet you can't guess what it is *8)

Anyway can someone point me in the right direction, whats the simplest way to detect a collision between paddles, and shoot it off on an angle?

Graphics 640, 480, 0, 2

SetBuffer BackBuffer()

; Initialize and center paddles.
Global PaddleY1 = 190
Global PaddleY2 = 190

; Initialize and center ball.
Global BallPosX = 317
Global BallPosY = 237

While Not KeyDown(1)
	Cls
	
	ProcessPaddle1()
	ProcessPaddle2()
	ProcessBall()
	
	Flip
Wend 

Function ProcessBall()

	BallPosX = BallPosX + 1
	Rect BallPosX, BallPosY, 6, 6
	
End Function

Function ProcessPaddle1()
	
	If KeyDown(30)
		PaddleY1 = PaddleY1 - 2
	ElseIf KeyDown(44)
		PaddleY1 = PaddleY1 + 2
	EndIf
	
	If PaddleY1 < 0 Then PaddleY1 = 0
	If PaddleY1 > 380 Then PaddleY1 = 380
	Rect 10, PaddleY1, 10, 100, 1
	
End Function

Function ProcessPaddle2()
	
	If KeyDown(200)
		PaddleY2 = PaddleY2 - 2
	ElseIf KeyDown(208)
		PaddleY2 = PaddleY2 + 2
	EndIf
	
	If PaddleY2 < 0 Then PaddleY2 = 0
	If PaddleY2 > 380 Then PaddleY2 = 380
	Rect 620, PaddleY2, 10, 100, 1
	
End Function

The simplest approach is to check if the ball's rectangle intersects a paddle's rectangle (using RectsOverlap().) If so, reverse the direction of the ball on the X-axis. Also, to have your pong paddles change the angle of the ball, add an amount to the Y component of the ball's velocity depending on how far from the centre of the paddle the ball struck.

If you're using custom images with transparent edges, you can use ImagesCollide() to check for per-pixel collisions.

Check out http://blitzstuff.awardspace.biz/phpBB2/viewtopic.php?t=23
for a tutorial orginally from BlitzCoder.com for a pong game of you get stuck.

octothorpe thanks mate, you where spot on, works a charm. I didn't want to load images and use imagesCollide(), just for something different.