Angle Bounces and Redirections!!!

[xHoly-Divinity]

I am making a pong game and am having trouble making the ball bounce off the board according to the angle that it approaches it in.

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[zylum]

so you have your xVelocity and yVelocuty... if it bounces off a vertical side ie | then mustiply the xVelocity by -1, otherwise if it hits a horizontal wall, multiply the yVelocity by -1

[xHoly-Divinity]

Would you be able to send me an example, because im not getting this....

[zylum]

code:

setscreen ("offscreenonly") var x, y, vx, vy : int x := maxx div 2 y := maxy div 2 vx := 1 vy := 1 loop     x += vx     y += vy     if x < 0 or x > maxx then         vx := vx * -1     end if     if y < 0 or y > maxy then         vy := vy * -1     end if     drawfilloval (x, y, 10, 10, 7)     View.Update     delay (10)     cls end loop

[xHoly-Divinity]

That's awesome, thanks man!

[Mazer]

Yes, the only time you would need to worry about a change in the direction of the ball is if you are taking into consideration the velocity of the paddle when they collide. (as well as forces of friction)

[xHoly-Divinity]

Yeah, but im not gonna worry about that yet. However, when I delete the "offscreenonly" for the setscreen, my circle flickers, and I'm just curious as to know what the offscreenonly does and if there are any limitations with it?

[xHoly-Divinity]

I am experiencing another problem. When my two boards move, i HAVE TO put a delay, but by adding this delay, I am slowing down the speed of the ball. Any way around this!!??

[zylum]

lower the delay or increase the velocities

[xHoly-Divinity]

I have tried that. See the problem is that in my main loop there is no delay. But when I run my procedure, there is a 40 second delay. So while I am not pressing any buttons the ball travels fast. But when I press a button to run my procedure, it gets affected by the 40 second delay and is slowed down so it does not maintain the same speed. Any suggestions....?

[Cervantes]

40 seconds, or 40 milliseconds?
Anyways, why do you have a delay in your procedure but not in your main loop? What is the purpose of the delay in the procedure? When you say "your two boards move", what are you referring to? Paddles?
Posting code would help us to help you.

[xHoly-Divinity]

I have figured it out!!! What I did was I put that x := x + 10 for when it was moving and put a 40 millisecond delay to make it seem more smoother. Now i just did x := x + 1 with no delay. :S, really dumb, I know!

[xHoly-Divinity]

OK!!! Now that I have finished my 'Pong' I really need some help with the velocity and stuff. E.g. If your paddle approaches the ball really fast, then the angle will be greater and the speed (sort of like a spin) because mine will always bounce the same angle and speed regardless of where and how on the paddle it is hit.