How do I limit the Camera and character rotation

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yahya

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Joined: 16th Oct 2008

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Posted: 8th Jul 2009 08:23

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OK I just need to know how can I limit my characters and camera rotation, so when I trun a 180 full trun, I don't see the characters back.

here is my code:

PostionCameraToObject:

+ Code Snippet

void PositionCameraToObject::positionCameraToObject(int obj, int thirdPerson, int RotateX, int RotateY)
{

	float fCameraAngleX = 0.0f;
	float fCameraAngleY = 0.0f;
	dbPositionCamera( dbObjectPositionX(50)-10,dbObjectPositionY(50)+60,dbObjectPositionZ(50)+10 );

		dbYRotateCamera( dbCameraAngleY() + ( RotateX/10.0f ) );
		dbXRotateCamera( dbCameraAngleX() + ( RotateY/10.0f ) );
}

and this is how i rotate my character:

+ Code Snippet

int RotateX = dbMouseMoveX();
int RotateY = dbMouseMoveY();

	dbPositionObject( 50,x,oldy,z );
	dbYRotateObject( 50,dbObjectAngleY(50) + ( RotateX/10.0f ) );
	dbXRotateObject( 50,dbObjectAngleX(50)+  ( RotateY/10.0f ) );

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jezza

16

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Joined: 8th Mar 2008

Location: Bham, UK

Posted: 8th Jul 2009 18:50

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something like this:

+ Code Snippet

if cameraangle > objectangle+90 then
	cameraangle = objectangle+90
else if cameraangle < objectangle-90 then
	cameraangle = objectangle-90
end if

BASIC style pseudocode today

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yahya

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Posted: 8th Jul 2009 21:32

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ok I did this:

+ Code Snippet

if(dbCameraAngleX() > RotateX+90)
		{
			  dbCameraAngleX() = RotateX+90;
		}
		else if (dbCameraAngleX() < RotateX- 90)
		{
			dbCameraAngleX() = RotateX -90;
		}
		if(dbCameraAngleY() > RotateY+90)
		{
			dbCameraAngleY() = RotateY+90;
		}
		else if (dbCameraAngleY() < RotateY - 90)
		{
			dbCameraAngleY() = RotateY - 90;
		}

But it just gives me this error :

error C2106: '=' : left operand must be l-value, isn't dbCameraAngleY() a value?

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jezza

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Posted: 8th Jul 2009 22:00

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yeah, you cant just say CameraAngleX = in GDK, you have to use the function, dbXRotateCamera I think. E.g. dbXRotateCamera(RotateX+90)

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Iuzidal

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Posted: 8th Jul 2009 22:06

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An "l-value" is something you can assign to. It means something that belongs on the left side of an '=' (assignment operator). In this case, you cannot assign to the return value of that function.

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yahya

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Posted: 8th Jul 2009 22:46

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ok I did as you said, changed the CameraAngleX() to CameraAngleX and dbXRotateCamera(RotateX+90) intstead of RotateX+90.

+ Code Snippet

if(dbCameraAngleX > dbXRotateCamera(RotateX+90))
		{
			  dbCameraAngleX = dbXRotateCamera(RotateX+90);
		}
		else if (dbCameraAngleX < dbXRotateCamera(RotateX-90))
		{
			dbCameraAngleX = dbXRotateCamera(RotateX-90);
		}
		if(dbCameraAngleY > dbXRotateCamera(RotateY+90))
		{
			dbCameraAngleY = dbXRotateCamera(RotateY+90);
		}
		else if (dbCameraAngleY < dbXRotateCamera(RotateY-90))
		{
			dbCameraAngleY = dbXRotateCamera(RotateY-90);
		}

it now gives me this:

"error C2563: mismatch in formal parameter list"
"error C2659: '=' : function as left operand"

:/

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Iuzidal

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Posted: 9th Jul 2009 01:23 Edited at: 9th Jul 2009 02:16

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I believe he was saying that the rotate will assign the angles for you... just call them:

+ Code Snippet

if(dbCameraAngleX() > RotateX+90)
{
   dbXRotateCamera(RotateX+90);
}
else if (dbCameraAngleX() < RotateX-90)
{
   dbXRotateCamera(RotateX-90);
}
if(dbCameraAngleY() > RotateY+90)
{
   dbYRotateCamera(RotateY+90);
}
else if (dbCameraAngleY() < RotateY-90)
{
   dbYRotateCamera(RotateY-90);
}

Edit: Originally I just removed the syntax error, but I think the logic was wrong as well. At work and unable to test.

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Hassan

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Posted: 9th Jul 2009 20:56 Edited at: 9th Jul 2009 21:00

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you cant simply change a function to a variable by removing the ().

instead, make a new variable and call it CameraAngleX for example.

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jezza

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Location: Bham, UK

Posted: 9th Jul 2009 23:44

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removing the brackets from a function enables it to be used with pointers etc, but that's top secret C++ guru stuff so shhhhh.

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yahya

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Posted: 10th Jul 2009 13:47

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lol thx, I couldn't use that in tije, alreayd handed in the game, but thanks for you help, thanks a lot

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