Very Basic help needed

[Kyle_Katarn]

Hey, newbie here.

I'm doing a PONG game for my software design class, and whatever I do, I cannot get my bat to work, it's driving me nuts.

Can someone please have a look at it?

Code: Select all

CLS
REM Demo Only
REM Initialisation
mbatx = 1
mbaty = 12
pbatx1 = 79
pbaty1 = 12
pbatx2 = 79
pbaty2 = 13
pbatx3 = 79
pbaty3 = 14
xpos = 2
ypos = 13
xposscore = 2
xdir = 1
ydir = 1
xincrement = 1
yincrement = .25
REM Introductory Screen
PRINT
PRINT TAB(6); "This is PONG the first ever computer game."
PRINT
PRINT TAB(6); "Machine is on the left."
PRINT TAB(20); "You are on the right."
PRINT
PRINT TAB(6); "Move the paddle with the up and down arrows."
PRINT
PRINT TAB(6); "Best out of 3."
PRINT TAB(6); "For every round you win, the speed increases."
PRINT
PRINT
INPUT "Enter the speed you prefer [1/9] slowest/fastest"; speed
CLS

DO WHILE playscore = 0 AND machscore = 0
REM User Score Interface
PRINT "Player", , , , "Com"
PRINT playscore, , , , machscore

REM Draw Machine Bat
DO WHILE mbaty = 1 OR mbaty <= 22
mbaty = ypos - 1
LOCATE mbaty, mbatx
PRINT "|"
PRINT "|"
PRINT "|"


REM Draw Player Bat
LOCATE pbaty1, pbatx1
PRINT "|"
LOCATE pbaty2, pbatx2
PRINT "|"
LOCATE pbaty3, pbatx3
PRINT "|"
IF pbaty < 22 AND INKEY$ = CHR$(80) THEN pbaty = pbaty - 1
IF pbaty > 2 AND INKEY$ = CHR$(72) THEN pbaty = pbaty + 1

REM Motion Part
        xpos = xpos + (xdir * xincrement)
        ypos = ypos + (ydir * yincrement)
        LOCATE ypos, xpos
        PRINT CHR$(15)
                REM Delay loop
                FOR d = 1 TO (35000 - speed * 3000)
                NEXT d

REM Move Player Bat
IF INKEY$ = CHR$(24) THEN
pbaty1 = pbaty1 - 1
pbaty2 = pbaty2 - 1
pbaty3 = pbaty3 - 1
END IF

REM Move Machine Bat

REM Bounce off Walls
       IF xpos = 79 THEN
           IF ABS(ypos - pbaty - 1) < 1.5 THEN xdir = xdir * -1
       END IF
       IF xpos = 2 THEN
           IF ABS(ypos - mbaty - 1) < 1.5 THEN xdir = xdir * -1
       END IF
      
       IF xpos < 2 THEN xdir = xdir * -1
       IF ypos > 22 THEN ydir = ydir * -1
       IF ypos < 2 THEN ydir = ydir * -1
REM Refresh the screen
       IF xpos = 80 THEN xdir = xdir * -1
       CLS
REM Scoring System
       IF xposscore > 79 THEN playscore = playscore + 1
       IF xposscore < 2 THEN machscore = machscore + 1
      
LOOP
LOOP
END

Thanks in advance.
~Kyle Out

[moneo]

Kyle,

I tried your program. t runs, but ignores the up/down arrows because you forgot that they are expanded ASCII codes.
Down Arrow is chr$(0)+chr$(80)
and
Up Arrow is chr$(0)+chr$(72)

You also have an INKEY looking for a chr$(24). I don't know what that should be.

Try these and see.

Regards..... Moneo

[nkk_kan]

moneo

i think she was trying to catch the "up" keypress by chr$(24)
you understood...Didn't you?

[BadMrBox]

"This is PONG the first ever computer game."

Pong wasn't the first computer game...

Anyhow, looking through the code I'm starting to wonder what pbaty is for?

[moneo]

moneo

i think she was trying to catch the "up" keypress by chr$(24)
you understood...Didn't you?

I suspected that, but I wasn't sure.
The ASCII character 24 in decimal is CAN (cancel), although if you do a
PRINT CHR$(24)
it prints out a character that looks like an up-arrow. But it's not.

An up-arrow is read in by the INKEY$ function as an extended character (2 bytes) containing Chr$0) and Chr$(72) as we said before.

The usage of INKEY$ and the extended characters can be very confusing, especially when some characters like TAB (09), CARRIAGE-RETURN (13), and ESCAPE (27) are NOT read in by INKEY$ as extended characters.

BTW, what made you refer to Kyle as "she"?

*****