Air Hockey Help!

[Eny]

Hi, I need some help with programming an airhockey game.
I already have the graphics for it but I'm a bit confused on how to setup the key movements and collision.

Theres nothing in my turing book I was given that answers my question and my teacher doesn't explain things very well... he leaves out a lot of information.

Any tutorials or tips would be great...

[Remm]

Hello and welcome to Compsci!

First of all, the best place you could head to would be the Turing Walkthrough -- a collection of basic to advanced tutorials and such made by other programmers.

Oh yeah - you can look in turing refrance under help in the acual turing program.

[Eny]

Thanks, I'll check that out... however, the help reference just confuses me further. I get half of what they say, hopefully that link will help.

[Eny]

Ok, I'm still a bit confused about how to make collision and the mouse keys work with the puck and 'sticks'(those puck looking things that push the puck).

I have a bit of a learning disability, so could someone dumb it down a bit for me? Sometimes I need to learn specifics.

[Dan]

Well there are a few difrent ways to do collision dectionion for this case:

1. The math + if staments way:

This is where you check to see if a point x,y or in this case your puck is past a line. For example you check to see if your puck's x value is greater then 0 and less then the maxX value and that your puck's y value is greater then 0 and less then the maxY value. If this NOT the case the you will whont to chage the direction of the puck.

For the padels you will whont do the same but the line you are checking agisted is moving.

Check out http://www.compsci.ca/v2/viewtopic.php?t=75 for examples and a tutoral about this.

2. The whatdocolor way: This way is probly the simplest tho not as dynaick or as efsihment.

What you do is check the color of the pixel where the puck is going to be and if it is the color of the padal or wall chage directions.

Check out http://www.compsci.ca/v2/viewtopic.php?t=2381 for more info on whatdotcolor.

The [Turing Walkthrough] has alot of other tutorals that will be help full. Also there is a fourm full of example sorce code. I whould try sreaching for pong as it is a game that is prity much the same as what you are doing.

Also for more help tyring coding somthing, and when you get stuck come back here and post your code and what you are having problems with. Poeleop give alot more helpfull help when you have code posted.

[Clayton]

key movements are simple, use Input.KeyDown or a combination of hasch and getch to get the value of the key you want to use to move whatever it is you want to move:D also, plz excuse Hacker Dan's horrible spelling, as he has had a problem with it ever since well....forever:D other than that good luck and check through the Turing Walkthrough for specific tutorials on subjects that you are having problems with:D

[Eny]

Thanks a bunch! If I have any more questions I'll do that

[Eny]

Well I found a code here for air hockey, and asked my teacher to explain it to me so I understand it. So I took the coding idea and am going to modify it to my original designing..I hope thats not a cheap way to do it

code:

setscreen ("graphics:700,max,position:center;center,nobuttonbar,offscreenonly") var x, y, button, paddlex, paddley, lastballx, lastbally := 100 var ballx, bally : real := 100 var power := 5 var dx, dy : real := 1 proc drawscreen     drawfillbox (0, 0, maxx, maxy, grey) % Border     drawfillbox (20, 20, maxx - 20, maxy - 20, 1) %Background     drawfillbox (20, 20, maxx - 20, 30, grey) % bottom     drawfillbox (maxx div 2 - 70, 20, maxx div 2 + 70, 40, black) % net     drawfillbox (20, maxy - 20, maxx - 20, maxy - 30, grey) % top     drawfillbox (maxx div 2 - 70, maxy - 20, maxx div 2 + 70, maxy - 40, black) % net     drawfillbox (20, maxy div 2, maxx - 20, maxy div 2 + 5, grey) %center line     %ball     drawfilloval (round (ballx), round (bally), 15, 15, 7)     %paddle     drawfilloval (paddlex, paddley, 35, 35, red)     View.Update     cls end drawscreen proc detection     if ballx > maxx or ballx < 0 then         dx *= -1     end if     if bally > maxy or bally < 0 then         dy *= -1     end if     if abs (sqrt ((ballx - paddlex) ** 2 + (bally - paddley) ** 2)) < 35 then         dx := (ballx - paddlex) / 10         dy := (bally - paddley) / 10     end if end detection loop     mousewhere (x, y, button)     if y > maxy div 2 then         paddley := maxy div 2     else         paddley := y     end if     if x > maxx then         paddlex := maxx     elsif x < 0 then         paddlex := 0     else         paddlex := x     end if     ballx += dx     bally += dy     detection     if abs (ballx - lastballx) > power or abs (bally - lastbally) > power then         lastballx := round (ballx)         lastbally := round (bally)         drawscreen     end if end loop

Code orgianly by rich cash.

Now if I were to add a score code area for the nets, what would I have to use?

[Clayton]

just create a seperate procedure to add to the score each time the pucks coordinates on the screen go beyond a certain point (you can also use View.WhatDotColor to do this) run the procedure and add to the score

[Eny]

Okey dokey, I'll try that now.

[Eny]

The perimeters are all wrong, I forget how to check them when you run the program but I'm sure I have some saved code that will do that...

So something like this?

code:

if x = 280 and y = 680 then         put "score"     end if

[Remm]

is that code you posted above the detection for the puck going in? if so, its only checking one single pixel :/
Have like
if x > num and x < num and y > num and y < num then
so you got if its greater than x value, but less than another x value, same with y

[Eny]

Oh! I get it now! Thanks.

[Eny]

Ok, another problem... I can't get the mouse.where to work with the graphics... is there something I need to put in the code for text?(other than put "")

[Eny]

Ok, nevermind... I fixed it

Now I got it reconizing the nets and I'm happy.

I'm just having one more problem... Ok, I got it to say , "SCORE!" everytime it goes into the net but it flashes by too fast and if I put a delay on it the entire screen goes white with the score text...

even if I do it like this:

code:

put "Score!" ..

it still covers the rest of the screen with white.