arrow keys control question - GameCreators Forum

Author

Message

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 30th Jul 2007 11:05

Link

i can't seem to use any of the following:

+ Code Snippet

if dbRightKey ()=1 then dbYRotateObject ( 10,1);
if dbLeftKey ()=1 then dbYRotateObject ( 10,-1);
if dbUpKey  ()=1 then dbMoveObject ( 10,-1);
if dbDownKey  ()=1 then dbMoveObject up ( 10,+1);

the compiler complains that the syntax is wrong:

+ Code Snippet

1>e:\all projects\project shelter\8 game code\shelter\shelter\main.cpp(12) : error C2061: syntax error : identifier 'dbRightKey'
1>e:\all projects\project shelter\8 game code\shelter\shelter\main.cpp(13) : error C2061: syntax error : identifier 'dbLeftKey'
1>e:\all projects\project shelter\8 game code\shelter\shelter\main.cpp(14) : error C2061: syntax error : identifier 'dbUpKey'
1>e:\all projects\project shelter\8 game code\shelter\shelter\main.cpp(15) : error C2061: syntax error : identifier 'dbDownKey'

here is my complete code:

#include "DarkGDK.h" 
void DarkGDK ( void )

{
dbSyncOn ( );
dbSyncRate ( 60 );
dbMakeCamera (0);
dbAutoCamOff ();

// controls

if dbRightKey ()=1 then dbYRotateObject ( 10,1);
if dbLeftKey ()=1 then dbYRotateObject ( 10,-1);
if dbUpKey  ()=1 then dbMoveObject ( 10,-1);
if dbDownKey  ()=1 then dbMoveObject up ( 10,+1);

//camera position
dbPositionCamera (25,25,25);
dbSetCameraRange (1,1000);
dbPitchCameraDown (75);
dbSetCameraFOV (70);

// load terrain
 dbLoadObject ("terrain.x",10);
dbScaleObject (10,200,200,200);
dbSetObjectCull (10,0);
dbScaleObjectTexture (10,100,100);
dbSetObjectSpecular ( 10, 0 );

//load sky
dbMakeObjectSphere (11,200);
dbSetObjectCull (11,0);
dbColorObject (11,dbRGB(186,169,103));
dbSetObjectEmissive (11,dbRGB(186,169,103));

//load watchtower object
dbLoadObject ("watchtower.x",12);
dbScaleObject (12,400,400,400);
dbSetObjectCull (12,0);
dbPositionObject (12,0,0,0);
dbSetObjectCull (12,0);
dbSetObjectSpecular ( 12, 0 );

while ( LoopGDK ( ) )
 {
//main loop

// create lights and shadows
dbMakeLight(30);
dbSetPointLight (30,50,50,50);
dbColorLight (30,dbRGB(186,169,103));
dbPointLight (30,0,0,0);
dbSetNormalizationOn ();
//dbSetGlobalShadowsOn();
dbSetShadowShadingOn ( 12 );
//disable the backdrop
 dbBackdropOff ();

dbSync ( );
 }
}

+ Code Snippet

#include "DarkGDK.h" 
void DarkGDK ( void )

{
dbSyncOn ( );
dbSyncRate ( 60 );
dbMakeCamera (0);
dbAutoCamOff ();

 // controls

if dbRightKey ()=1 then dbYRotateObject ( 10,1);
if dbLeftKey ()=1 then dbYRotateObject ( 10,-1);
if dbUpKey  ()=1 then dbMoveObject ( 10,-1);
if dbDownKey  ()=1 then dbMoveObject up ( 10,+1);

//camera position
dbPositionCamera (25,25,25);
dbSetCameraRange (1,1000);
dbPitchCameraDown (75);
dbSetCameraFOV (70);

 // load terrain
 dbLoadObject ("terrain.x",10);
dbScaleObject (10,200,200,200);
dbSetObjectCull (10,0);
dbScaleObjectTexture (10,100,100);
dbSetObjectSpecular ( 10, 0 );

//load sky
dbMakeObjectSphere (11,200);
dbSetObjectCull (11,0);
dbColorObject (11,dbRGB(186,169,103));
dbSetObjectEmissive (11,dbRGB(186,169,103));

//load watchtower object
dbLoadObject ("watchtower.x",12);
dbScaleObject (12,400,400,400);
dbSetObjectCull (12,0);
dbPositionObject (12,0,0,0);
dbSetObjectCull (12,0);
dbSetObjectSpecular ( 12, 0 );

while ( LoopGDK ( ) )
 {
//main loop

// create lights and shadows
dbMakeLight(30);
dbSetPointLight (30,50,50,50);
dbColorLight (30,dbRGB(186,169,103));
dbPointLight (30,0,0,0);
dbSetNormalizationOn ();
//dbSetGlobalShadowsOn();
dbSetShadowShadingOn ( 12 );
//disable the backdrop
 dbBackdropOff ();

 dbSync ( );
 }
}

Back to top

Profile PM

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 30th Jul 2007 11:07

Link

also i'm having troouble with the shadows... they are not showing up.

They did at some point while i was working on the arrow keys code, but then i must have chenged something that messed it up...

Back to top

Profile PM

Morcilla

21

Years of Service

User Offline

Joined: 1st Dec 2002

Location: Spain

Posted: 30th Jul 2007 11:58

Link

The evaluating function must be between "(" and ")".
Also "then" is not a reserved C/C++ word.

This is the right syntax:

+ Code Snippet

if (dbRightKey()) dbYRotateObject ( 10, 1);
if (dbLeftKey ()) dbYRotateObject ( 10,-1);
if (dbUpKey   ()) dbMoveObject    ( 10,-1);
if (dbDownKey ()) dbMoveObjectUp  ( 10,+1);

Also all the commands at the main loop do not need to be executed every time (except dbSync() ).

Back to top

Profile PM Email Website

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 30th Jul 2007 12:29

Link

Got it!

I googled a bit and found a piece of code that helped a lot, i worked around it a little since it was originally written to control a camera and achieved this:

+ Code Snippet

// controls

 if (dbUpKey()==1) 
  { 
   dbMoveObject (12,1.0);
  } 
  if(dbDownKey()==1) 
  { 
   dbMoveObject (12,-1.0);
  } 
  if(dbLeftKey()==1) 
  { 
   dbMoveObjectLeft (12,1.0);
  } 
  if(dbRightKey()==1) 
  { 
   dbMoveObjectRight (12,1.0);
  }

Also the shadows now work for some reason...

Back to top

Profile PM

Red Ocktober

20

Years of Service

User Offline

Joined: 6th Dec 2003

Location:

Posted: 30th Jul 2007 16:09

Link

there ya go!!

also, if you only have a single statement following the conditional, you can omit the braces...

+ Code Snippet

 if (dbUpKey()==1) dbMoveObject (12,1.0);
 
 if(dbDownKey()==1) dbMoveObject (12,-1.0);

 if(dbLeftKey()==1)dbMoveObjectLeft (12,1.0); 

 if(dbRightKey()==1) dbMoveObjectRight (12,1.0);

... and save lil whitespace.

also, to make the code even more compact, this should work as well...

+ Code Snippet

 if (dbUpKey()) dbMoveObject (12,1.0);
 
 if(dbDownKey()) dbMoveObject (12,-1.0);

 if(dbLeftKey())dbMoveObjectLeft (12,1.0); 

 if(dbRightKey()) dbMoveObjectRight (12,1.0);

... although i'm not 100% sure, as i haven't tested it. but it should satisfy the overlap between logical and value equality...

--Mike

Back to top

Profile PM

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 30th Jul 2007 20:52

Link

just tested it and it works great! I'll definitely use that approach when i need it.

Right now i'm just brainstorming different methods to see which one feels better for my game, i even thought about a point-and-click interface like in Fallout 1/2, with the character walking automatically to the clicked XZ coordinates while the camera follows with a slight momentum.

Back to top

Profile PM

Chalkey

17

Years of Service

User Offline

Joined: 25th May 2007

Location:

Posted: 30th Jul 2007 21:05

Link

Hey

A little point no one has made... In your original code post you used if dbRightKey ()=1 then.... In C++ the '=' symbol is the assign operator. This is used to assign a value of some sort to a variable... e.g. int x = 1;.

To compare variables you have to use the '==' operator. e.g. if (x == 1).

Hope this helps!
Chalk

Back to top

Profile PM

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 30th Jul 2007 21:18

Link

great timing Chalkey!

This last one solved my compiling problem with this little snippet:

+ Code Snippet

 // controls

 if (dbMouseClick ()==1 ) dbPositionObject (12, dbMouseX(),0,dbMouseZ());

The only thing is... how do i make the movement smoother and relative to a 3D plane underneath the object to be moved upon mouse click, so that the object doesn't just disappear into oblivion?

Back to top

Profile PM

unitech

17

Years of Service

User Offline

Joined: 27th Jun 2007

Location:

Posted: 31st Jul 2007 17:59 Edited at: 31st Jul 2007 18:00

Link

Like Mike said, its best to use..

if (dbUpKey()) dbMoveObject (12,1.0);

Any thing in a () can be evaluated as true or false.

For example.

int r=1
if (r == 1) //do this..
same as
if (r) //do this. Since 0 would be false.

or

bool r=true
if (r) //do this.

In other words

if (anything in here evaluates true) // do this

Back to top

Profile PM

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 31st Jul 2007 18:11

Link

thanks, i think i'm (slowly) getting it... the controls work ok now, and i started playing with dbPlayObject and dbLoopObject. I'm working on a few low poly crash test dummies to use but i don't quite seem to get the animation loop right, i started a thread about it here

Back to top

Profile PM

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 3rd Aug 2007 18:08 Edited at: 3rd Aug 2007 18:10

Link

ok i gotta get back to this thread with a question about key combinations. Here is my problem:

+ Code Snippet

/////////////////////////////////WALK CYCLE
//move forward

if ( dbUpKey() == 1 ) 
 
 {
dbLoopObject (12,0,60);
dbMoveObject (12,+0.5f);
 }

//turn left

if ( dbLeftKey() == 1 ) 
 
 {
dbLoopObject (12,0,60);
dbTurnObjectLeft (12,+1.0f);
 }

//turn right

if ( dbRightKey() == 1 ) 
 
 {
dbLoopObject (12,0,60);
dbTurnObjectRight (12,+1.0f);
 }

/////////////////////////////////RUN CYCLE ACTIVE WHEN PRESSING ARROW KEY AND SHIFT KEY AT THE SAME TIME
//move forward

if (( dbUpKey()+dbShiftKey()) == 1 ) 
 
 {
dbLoopObject (12,61,110);
dbMoveObject (12,+1.5f);
 }

//turn left

if (( dbLeftKey()+dbShiftKey()) == 1 ) 
 
 {
dbLoopObject (12,61,110);
dbTurnObjectLeft (12,+1.0f);
 }

//turn right

if (( dbRightKey()+dbShiftKey()) == 1 ) 
 
 {
dbLoopObject (12,61,110);
dbTurnObjectRight (12,+1.0f);
 }

The walk cycle works great for me but i would also like to be able, as the character walks, to switch to running by pressing the Shift key without letting go of the arrow...

Is there a clean and tidy way to do it without writing a massive amount of code? I'm saying this because i had a look at IanM's event handler feature and that seemed a little scary for little ol' me at this stage, lol

Back to top

Profile PM

Chalkey

17

Years of Service

User Offline

Joined: 25th May 2007

Location:

Posted: 3rd Aug 2007 18:58

Link

Hey

You are using the wrong operators. To compare two values in one if statement (or more than two) you would do some thing like this...

+ Code Snippet

if ((dbUpKey() == 1) && (dbShiftKey()) == 1)) 
{
    dbLoopObject (12,61,110);
    dbMoveObject (12,+1.5f);
}

Have a look at this Wiki(!) page about C/C++ operators. http://en.wikipedia.org/wiki/Operators_in_C_and_C++

Cheers
Chalk

Back to top

Profile PM

i cant believe its not fabio

18

Years of Service

User Offline

Joined: 10th Feb 2006

Location:

Posted: 3rd Aug 2007 19:41

Link

mmh... now it works in a sense that the operator is correct, but i got the feeling that there is a command overlap somwhow.

What happens is that as i keep pressed the UpKey the character walks, then as i keep pressing the UpKey i also press the ShiftKey and expect the character to switch the animation loop to the one where it runs, but the animation does not get played, the character moves spatially as expected but the loop gets stuck in its first frame...

Back to top

Profile PM

Niels Henriksen

20

Years of Service

User Offline

Joined: 27th Sep 2004

Location: Behind you breathing heavely

Posted: 4th Aug 2007 21:43

Link

Instead of using dbUpKey then try to find Scancodes for the keys.

Notice: The example is in LightEngine and VB.NET
cKeyboard is my keyboard class where I define keys
Player is the player object

+ Code Snippet

If LightKeyboard.State(cKeyboard.RotateLeft) Then
  Player.YRotate(Player.AngleY - 2)
End If

If LightKeyboard.State(cKeyboard.MoveForward) Then
  Player.Move(0.1)
End If

If LightKeyboard.State(cKeyboard.MoveBackward) Then
  Player.Move(-0.1)
End If

If LightKeyboard.State(cKeyboard.RotateRight) Then
  Player.YRotate(Player.AngleY + 2)
End If

With this code my player can go forward AND turn left or right at the same time.

Niels Henriksen
Working on a (MMO)RPG right now in DarkEngine
http://www.tigernet.dk - Send SMS to mobile online (will come in english soon)

Back to top

Profile PM Email Website

Sorry your browser is not supported!

Dark GDK / arrow keys control question