Why doesn't this code work?* - GameCreators Forum

Author

Message

talentless newbie

17

Years of Service

User Offline

Joined: 12th Jun 2007

Location:

Posted: 12th Jun 2007 12:08

Link

As you might guess, I'm _completely_ new to this, coming from C. I thought I'd attempt something more complex and structured than the cube sample in the manual, but this just exits without an error message, and without displaying anything, and I don't get why. I'm hoping someone more knowledgeable can help...

+ Code Snippet

#constant CUBE_NUM 0

up_ang   = 0.0;
left_ang = 0.0;

`********************************************************

function startup
   `set some basic options
   sync on;
   sync rate 60;
   set text size 16;
   set display mode 640, 480, 32;
endfunction;

`********************************************************

function animate(left_pressed as boolean, up_pressed as boolean)
   if left_pressed
      left_ang = left_ang + 0.1;
      text 16,16,"left pressed";
   endif

   if up_pressed
      up_ang = up_ang + 0.1;
      text 16,32,"up pressed";
   endif
   rotate object CUBE_NUM, left_ang, up_ang, 0.0;
endfunction;

`********************************************************
`main
left_key = 0;
up_key   = 0;

startup();
make object cube CUBE_NUM, 100;
while not (escapekey())

   left_key = LEFTKEY();
   up_key   = UPKEY();

   animate(left_key,up_key);
   sync;

endwhile

It compiles, but when run, it simply exits. I've verified that the manual's cube example produces a working .exe, and I know for a fact that my video card is capable of the requested mode.

I've also tried replacing "while not (escapekey())" with "while(1)" and that didn't seem to help...

Any ideas?

Back to top

Profile PM

Xsnip3rX

17

Years of Service

User Offline

Joined: 20th Feb 2007

Location: Washington State

Posted: 14th Jun 2007 04:50

Link

also add wait mouse to the bottom so it exits when you click the mouse.

Back to top

Profile PM Email

Kieran

18

Years of Service

User Offline

Joined: 6th Aug 2006

Location: Hamilton, New Zealand

Posted: 14th Jun 2007 08:13

Link

oh lol im too late :p oh well good luck

Back to top

Profile PM

talentless newbie

17

Years of Service

User Offline

Joined: 12th Jun 2007

Location:

Posted: 14th Jun 2007 10:22

Link

Hi all,

First of all, thanks! Sorry about the duplicate posts; I didn't realize they'd gone into a moderator queue and instead just thought the post mechanism wasn't working.

Okay, so I've gotten it to render the cube by following the above steps. But now, I have another problem that, again, didn't seem to be covered after having R'ed T.F.M.

The first is with this code:

Inside the main loop:

+ Code Snippet

      animate(leftkey(),upkey());
      print leftkey();
      print upkey();

      sync;

Inside animate():

+ Code Snippet

function animate(left_pressed as boolean, up_pressed as boolean)
   called = called + 1;

   `Why is this block never executing?
   if (up_pressed)
      angles.x_angle = angles.x_angle + 0.1
      text 16,64,"up pressed"
   endif

   `...but this part works fine?
   if (left_pressed)
      angles.y_angle = angles.y_angle + 0.1
      text 16,48,"left pressed"
   endif
endfunction;

Why does the if(up_pressed) block never execute? I've checked that the app is able to `see' the up arrow key (see the print statements in the main loop), and if I reverse the parameters when calling animate(), pressing up arrow is able to trigger the left_pressed case.

Any ideas?

Additionally, does anyone know if DB pro passes by value or by reference? And does the user have a way to control that or force the issue?

Back to top

Profile PM

Sorry your browser is not supported!

Newcomers DBPro Corner / Why doesn't this code work?*