And the issues keep arising... - GameCreators Forum

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Scarface

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Joined: 21st Oct 2006

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Posted: 23rd Aug 2007 01:56

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Here is what I have so far:

+ Code Snippet

#include "DarkGDK.h"

void CheckMovement(float fXPos);
void CheckShoot(float fXPos);

void DarkGDK() {

	dbSyncOn( );
	dbMakeObjectCube(1, 10.0);
	dbMakeObjectCube(2, 0.5);
	dbHideObject(2);

	float fXPos = dbObjectPositionX(1); 
	dbPositionObject(1, fXPos, -75.0, 150.0);
    
	while (!dbEscapeKey()) {

		fXPos = dbObjectPositionX(1);
		CheckMovement(fXPos);
		CheckShoot(fXPos);
		dbSync();
	}
}

void CheckMovement(float fXPos) {

	if (dbLeftKey() && fXPos >= -100.0) {
			
		dbMoveObjectLeft(1, 2.0);
	}
	if (dbRightKey() && fXPos <= 100.0) {

		dbMoveObjectRight(1, 2.0);
	}
}

void CheckShoot(float fXPos) {

	if (dbSpaceKey()) {

		float fYPos;
		dbPositionObject(2, fXPos, -75.0, 150.0);	
		dbShowObject(2);
		
		while (fYPos <= 400.0) {

			fYPos = dbObjectPositionY(2);
			dbMoveObjectUp(2, 1.0);
		}
	}
}

The problem is, nothing shoots out at all, the window just closes (I assume a crash).

- Scarface

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Ancient Lady

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20

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Joined: 17th Mar 2004

Location: Anchorage, Alaska, USA

Posted: 23rd Aug 2007 02:05

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Your main loop should be:

+ Code Snippet

while (LoopGDK())

or

+ Code Snippet

while (LoopGDK()&& (!dbEscapeKey()))

The DarkGDK requires the call to 'LoopGDK' to execute properly. The 'LoopGDK' will exit when the escape key is pressed, unless you disable it. Since you aren't calling that function, the program pretty much ends immediately.

Cheers,
Ancient Lady

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Scarface

18

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Joined: 21st Oct 2006

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Posted: 23rd Aug 2007 02:24

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I still get the same result, it just ends the application when space is pressed.

- Scarface

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Ancient Lady

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Joined: 17th Mar 2004

Location: Anchorage, Alaska, USA

Posted: 23rd Aug 2007 02:32

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I just noticed that you are using fYPos in the while loop before you initialise it.

Try this:

+ Code Snippet

void CheckShoot(float fXPos) {

	if (dbSpaceKey()) {

		float fYPos;
		dbPositionObject(2, fXPos, -75.0, 150.0);	
		dbShowObject(2);
		
		fYPos = dbObjectPositionY(2);
		while (fYPos <= 400.0) {

			dbMoveObjectUp(2, 1.0);
			fYPos = dbObjectPositionY(2);
		}
	}
}

Cheers,
Ancient Lady

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Scarface

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Joined: 21st Oct 2006

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Posted: 23rd Aug 2007 02:47

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Nice catch, doesn't crash anymore however it still doesn't shoot

- Scarface

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Ancient Lady

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Joined: 17th Mar 2004

Location: Anchorage, Alaska, USA

Posted: 23rd Aug 2007 03:03

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That's because (I think) the entire action takes place between one dbSync call and the next.

You need to set up something a bit more complex:
1. the space bar initiates shoot and sets the start position and set a flag to indicate shooting.
2. each dbSync cycle after, check the object's position, if not at end, move it. if at end, clear flag to check status.

Cheers,
Ancient Lady

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Scarface

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Joined: 21st Oct 2006

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Posted: 23rd Aug 2007 10:53

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Ok thanks, i'll give that a try this morning

- Scarface

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Dark GDK / And the issues keep arising...