Question about code

[Paul Christopher]

I'm having an issue having the image for the bullet track the ships location and shoot horizontally. I had it track the ship for my asteroids program and now I can't figure out why it won't track.

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

class Asteroids {
public:

	Asteroids() {

		//Set Asteroid ID
		ast_id = numObjects;
		astDestroyed = false;

		//Variables
		astx = rand() %700;
		asty = rand() %500;
		astx_cnt = 2;
		asty_cnt = 2;
		asrotate = 0;

		numObjects++;
	}

	~Asteroids() {
		

		numObjects--;
	}

	static int numObjects;

	void Location () {

		//Asteroid Variables
		asmove = 0;
		
		//Check Value of Asteroid
		if (astDestroyed)
			return;

		//Asteroid Movement Variables
		dbSprite(ast_id,astx,asty,5);
		astx = astx + astx_cnt;
		asty = asty + asty_cnt;
		astx_inc = astx+1;
		asty_inc = asty+1;

		//Rotate Asteroid 1
		asrotate = asrotate +5;
		dbRotateSprite(ast_id,asrotate);
		
		//Place Asteroid Sprite
		if (dbSpriteExist(ast_id))
		{
			dbOffsetSprite(ast_id,28,29);

			if (asty >= 520) 
			{
				asty_cnt = (asty_cnt * (-1));
			}
        
			if (astx >= 700)
			{
				astx_cnt = (astx_cnt * (-1));
			}
        
			if (asty <=-100)
			{
				asty_cnt = (asty_cnt * (-1));
			}
        
			if (astx <=-100)
			{
				astx_cnt = (astx_cnt * (-1));
			}
		}

		Collision(ast_id);
	}

	void Collision(int ast_id){

		int astx1;
		int asty1;

		//Circular Collision Variables
		radius = 28 + 22;
		shipx = dbSpriteX(1);
		shipy = dbSpriteY(1);
		distx = shipx - astx;
		disty = shipy - asty;

		//Circular Collision
		if (dbSpriteExist(ast_id))
		{
			astx1 = dbSpriteX(ast_id);
			asty1 = dbSpriteY(ast_id);
		}

		//set collision for ship and asteroids
		if (dbSpriteExist(ast_id))
		{
			if ((radius * radius) > (distx * distx) + (disty * disty))
			{
				dbDeleteSprite(1);
			}
		}
		
		if (dbSpriteExist(7))
		{
			dbMoveSprite(7,bullet_speed);

			if (dbSpriteHit(ast_id,7))
			{
				dbDeleteSprite(ast_id);
				dbDeleteSprite(7);
				astDestroyed = true;
			} 
		}
	}
		

	private:

	//Asteroid Variables
	int asrotate;
	int asmove;
	int ast_id;
	int astx;
	int asty;
	
	//Asteroid Movement Variables
	int astx_inc;
	int asty_inc;
	int astx_cnt;
	int asty_cnt;

	//Circular Collision Variables
	int radius;
	int shipx;
	int shipy;
	int distx;
	int disty;
	bool astDestroyed;

	//Bullet variables
	int bullet_speed;



};

int Asteroids::numObjects=10;

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	//Load Images
	dbLoadImage("ship.png",1);
	dbLoadImage("nightsky.jpg",2);
	dbLoadImage("city.png",3);
	
	dbCreateAnimatedSprite(4,"sprite.png",3,1,4); //creates animated civilian sprite
	
	dbLoadImage("pokeball.png",5);
	dbLoadImage("cloud.png",6);
	dbLoadImage("bullet.png",7);
	
	dbSetWindowSize(1024,768);  

	//Sprites
	dbSprite(2,0,0,2); //Sky
	dbSprite(3,0,280,3); //City
	dbSprite(1,1,250,1); //Ship
	dbSprite(6,0,0,6); //Cloud
	dbSprite(4,0,400,4); //animated sprite

	//Sprite Priority
	dbSetSpritePriority (2,0); //back image
	dbSetSpritePriority (3,1);
	dbSetSpritePriority (7,2);
	dbSetSpritePriority (1,3);
	dbSetSpritePriority (4,4);
	dbSetSpritePriority (6,5);
	dbSetSpritePriority (5,6); //front Images
	
	
	

	//Variables
	float left = 0.0;
	float right = 1.0;
	
	float leftcity = 0.0;
	float rightcity = 1.0;

	float leftcloud = 0.0;
	float rightcloud = 1.0;

	//Variables
	int bulletx = dbSpriteX(1);
	int bullety = dbSpriteY(1);

	std::vector<Asteroids*> asteroid;
		for (int i=0; i<10; ++i){
			asteroid.push_back(new Asteroids);
		}

	// our main loop
	while ( LoopGDK ( ) )
	{
		
		for (unsigned int i=0; i<asteroid.size(); ++i){
			asteroid[i]->Location();
		}
		dbPlaySprite(4,1,3,300);
		
		//Scrolling Background
		dbSetSpriteTextureCoord(2, 0, left, 0);
		dbSetSpriteTextureCoord(2, 1, right, 0);
		dbSetSpriteTextureCoord(2, 2, left, 1);
		dbSetSpriteTextureCoord(2, 3, right, 1);

		//Scrolling City
		dbSetSpriteTextureCoord(3, 0, leftcity, 0);
		dbSetSpriteTextureCoord(3, 1, rightcity, 0);
		dbSetSpriteTextureCoord(3, 2, leftcity, 1);
		dbSetSpriteTextureCoord(3, 3, rightcity, 1);

		//Scrolling Clouds
		dbSetSpriteTextureCoord(6, 0, leftcloud, 0);
		dbSetSpriteTextureCoord(6, 1, rightcloud, 0);
		dbSetSpriteTextureCoord(6, 2, leftcloud, 1);
		dbSetSpriteTextureCoord(6, 3, rightcloud, 1);

		//Background Movement
		if (dbLeftKey())
		{
			left += 0.002;
			right += 0.002;

			leftcity += 0.002;
			rightcity += 0.002;

			leftcloud += 0.0023;
			rightcloud += 0.0023;
		}

		//Ship Movement
		if (dbUpKey())
		{
			dbMoveSprite(1,5);
		}
		if (dbDownKey())
		{
			dbMoveSprite(1,-5);
		}
		if (dbSpriteExist(1)) {

			if (dbKeyState(0x39))
			{
				dbSprite(7,bulletx,bullety,7);
				dbOffsetSprite(7,5,5); 
			}
		}

		//Civilian Collision
		if (dbSpriteExist(4))
		{
			if (dbSpriteHit(1,4))
			{
				dbDeleteSprite(4);
			}
		}
		

		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}