Help with Making Something Fire at a Cretin rate

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negi

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Joined: 16th Feb 2011

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Posted: 13th Dec 2011 01:08

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Hay I have been making my own version of Asteroids and cannot seem to find a way to make the ship fire a bullet every so often. It only ever makes a sprite continuously, not at all or every 10 seconds.

I also have tryed to use a timer.

Here is the code I am using now.

+ Code Snippet

if(dbSpaceKey() && Fireing == false)
{

dbCloneSprite(10,BulletCount);
dbSprite(BulletCount,ShipX,ShipY,10);
dbScaleSprite(BulletCount,25);
dbShowSprite(BulletCount);
dbRotateSprite(BulletCount,dbSpriteAngle(4));
BulletCount++;
Fireing = true;
}
else
{
Fireing = false;
}

Any help witht this would be great.

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Hassan

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Posted: 13th Dec 2011 18:20 Edited at: 13th Dec 2011 18:21

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+ Code Snippet

else
{
Fireing = false;
}

find someway else for that, you will want "Fireing" stay true until the bullet hit something or it goes out of screen, so set that as the condition instead of this "else", you might as well have this somewhere else in your code

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negi

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Posted: 13th Dec 2011 20:32

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Hmm ok but how should I go about making something fire at a certain rate like 5 times a second? I have tried to use a timer but it ether does not fire or fires too fast. And thanks so much for your help

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Wizz

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Posted: 13th Dec 2011 21:29 Edited at: 13th Dec 2011 21:29

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To make something fire at a certain rate with timers you will need 2 variables, the first of which has the value of the current time in each frame, and the second of which only updates to the current time when you start measuring the time pause (between shots fired).
The code should look something like this:

+ Code Snippet

//global variables
bool time_got = false;
int time_current=0;
int time=0;

//in the game loop
time_current = dbTimer(); //constantly updates the variable with the current time.
if(time_got==false){
  time=dbTimer();  //because time_got turns to true right after this variable is updated, it happens only once. It will happen again as soon as you turn time_got back to false.
  time_got=true;
}

if (time_current - time >= pause){  //make sure to put in >= because if you put in == the timer will skip that exact value most of the time, because time is independent of your frame cycles.
  -bullet firing code-
  time_got = false;  //switch this bool back to false so that time can get uodated again and it all starts over.
}

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negi

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Posted: 13th Dec 2011 22:34

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I tryed what you said and now the sprite I have for the Player disappears.

here is the code

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CurrBulletTime = dbTimer();

		if(TimeGot == false)
		{
			CurrBulletTime = dbTimer();
			TimeGot = true;
		}
		
			if ( CurrBulletTime - BulletTime >= FireRate)
			{
				dbSprite(50,dbSpriteX(4),dbSpriteY(4),10);
			TimeGot = false;
			}

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Wizz

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Posted: 13th Dec 2011 23:37

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You have to switch the CurrBulletTime - BulletTime around:
if ( BulletTime - CurrBulletTime >= FireRate)

Also, time is measured in miliseconds so one second is 1000.

The sprite disappears because you are using the same ID for all the bullet sprites. First you spawn a sprite with ID=50 at certain coordinates, and then you make it move. But when you fire the second bullet you make the same sprite again (cause you told the system to use the sprite with ID=50. Each time you make a sprite it needs a different ID.

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negi

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Posted: 13th Dec 2011 23:52

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I have a varialble that holds a sprite number for the bullet but its the Ship that the player controls that disaperes.

here is the code for the whole game

#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{

//Flags**************************//
	bool GameStarted = false;    //
	bool GameOver = false;       //
	bool Moving = false;         //
	bool ShipMoving = false;     //
	bool Fireing = false;        //
//*******************************//
bool TimeGot;

//Time Variables*********//
	float CurrTime;      //
	float Time;          //
                         //
	Time = dbTimer();    //
                         //
	int Second = 0;      //
	int Minute = 0;      //
	int Hour   = 0;      //
//***********************//

//Ship Varialbes*******************//
	float ShipStartSpeed = 0;      //
	float ShipCurrSpeed = 0;       //
	float ShipMaxSpeed = 10;       //
	float ShipX = 20;              //
	float ShipY = 20;              //
	float Score = 0;               //
	float ShipRotation = 0;        //
	float ShipShield = 650;        //
	float ShipShownShield = 150;   //
	int BulletCount = 51;          //
	int CurrBulletCount = 51;      //
	int FireRate = 300;
	float CurrBulletTime = 0;
	float BulletTime = 0;
//*********************************//

// Frame rate and window setup*************//
	dbSyncOn   ( );                        //
	dbSyncRate ( 60 );                     //
	dbSetWindowSize(1024,768);             //
	dbSetImageColorKey(255,255,255);       //
//*****************************************//

// Curser*********************************//
	dbLoadImage("AsteroidsCurser.bmp",3); //
	dbHideMouse();                        //
//****************************************//

// Start Screen*************************//
dbLoadImage("AsteroidsStartPage.bmp",1);//
	dbSprite(1,0,0,1);                  //
	dbScaleSprite(1,63);                //
	                                    //
	 // Start BTN                       //
	dbLoadImage("StartBtn.bmp",2);      //
	dbSprite(2,308,100,2);              //
//**************************************//

//Asteroids*************************************//
	dbLoadImage("AsteroidPrime1.bmp",11);       //
	dbLoadImage("AsteroidPrime2.bmp",12);       //
	dbLoadImage("AsteroidSub1.bmp",13);         //
	dbLoadImage("AsteroidSub2.bmp",14);         //

// Ship*****************************************//
	dbLoadImage("AsteroidsShipFinal.bmp",4);    //
	dbSprite(4,ShipX,ShipY,4);                  //
	dbOffsetSprite(4,dbSpriteWidth(4) / 2,      //
		dbSpriteHeight(4) / 2);                 //
                                                //
//ShipShield************************************//
	dbLoadImage("AsteroidsShield.bmp",5);       //
	dbSprite(5,ShipX,ShipY,5);                  //
	dbOffsetSprite(5,dbSpriteWidth(5) / 2,      //
		dbSpriteHeight(5) / 2);                 //
	dbHideSprite(5);                            //
//ShipBullet************************************//
	dbLoadImage("AsteroidsBullet.bmp",50);
	//dbSprite(50,70,70,50);
	//dbScaleSprite(50,20);
	//dbOffsetSprite(50,dbSpriteHeight(50) / 2,
		//dbSpriteWidth(50) / 2);
	//dbHideSprite(50);
//**********************************************//

// our main loop
	while ( LoopGDK ( ) )
	{
		CurrTime = dbTimer();
		dbScaleSprite(4,20);

if ( GameStarted == false )
		{
		dbHideSprite(4);
		}

dbSprite(3,dbMouseX(),dbMouseY(),3);

if ( dbSpriteCollision(2,3) && dbMouseClick())
		{
			GameStarted = true;
			dbHideSprite(1);
			dbHideSprite(2);
		}

if ( GameStarted == true)
		{
			dbText(10,10,"The game has started");
			dbText(10,25,"Score:");
			dbText(60,25,dbStr(Score));
			dbShowSprite(4);
			dbHideSprite(3);
		}

if ( ShipCurrSpeed != 0)
		{
			ShipMoving = true;
		}
		else
		{
			ShipMoving = false;
		}

//MoveShip********************************************//
		if ( dbUpKey() && ShipStartSpeed < 10 )
		{
			if ( CurrTime > Time + 10)
			{
				ShipStartSpeed += .2;
			}

}
		if( dbUpKey() != 1 && ShipCurrSpeed > 0)
		{
			ShipStartSpeed -= .01;
		}

if ( ShipMoving == true )
		{
			dbMoveSprite(4,ShipCurrSpeed);
		}

if(ShipStartSpeed < 0)
		{
			ShipStartSpeed = 0;
		}

ShipCurrSpeed = ShipStartSpeed;
		dbText(50,300,dbStr(ShipCurrSpeed));
		dbText(50,350,dbStr(ShipStartSpeed));

ShipX = dbSpriteX(4);
		ShipY = dbSpriteY(4);

if( ShipX > 640 )
		{
			ShipX = 0;
			dbSprite(4,ShipX,ShipY,4);
		}
		if( ShipX < 0 )
		{
			ShipX = 640;
			dbSprite(4,ShipX,ShipY,4);
		}

if( ShipY > 510)
		{
			ShipY = 0;
			dbSprite(4,ShipX,ShipY,4);
		}
		
		if( ShipY < 0 )
		{
			ShipY = 510;
			dbSprite(4,ShipX,ShipY,4);
		}

dbText(100,100,dbStr(ShipY));
		dbText(100,150,dbStr(ShipX));

//*****************************************************

//ShipShield***********************************************//
		if ( dbDownKey() && ShipShownShield > 0 )          //
		{                                                  //
			dbSprite(5,dbSpriteX(4),dbSpriteY(4),5);       //
			dbShowSprite(5);                               //
		}                                                  //
		else                                               //
		{                                                  //
			dbHideSprite(5);                               //
		}                                                  //
                                                           //
		dbBox(500,5,ShipShield,10);                        //
		dbText(500,15,"Shield:");                          //
		dbText(560,15,dbStr(ShipShownShield));             //
                                                           //
		if(dbDownKey() == 1)                               //
		{                                                  //
			ShipShownShield -= .2;                         //
			ShipShield -= .2;                              //
		}                                                  //
		else                                               //
		{                                                  //
			if ( ShipShield < 650)                         //
			{                                              //
				ShipShield += .1;                          //
				ShipShownShield += .1;                     //
			}                                              //
		}                                                  //
		if( ShipShownShield < 0)                           //
		{                                                  //
			ShipShownShield = 0;                           //
		}                                                  //
		if(ShipShownShield > 150)                          //
		{                                                  //
			ShipShownShield = 150;                         //
		}                                                  //
		if(ShipShield < 500 )                              //
		{                                                  //
			ShipShield = 501;                              //
		}                                                  //
		if(ShipShield > 650 )                              //
		{                                                  //
			ShipShield = 650;                              //
		}                                                  //
                                                           //
		if ( ShipShownShield == 0)                         //
		{                                                  //
			dbHideSprite(5);                               //
		}                                                  //
                                                           //
//*********************************************************//

//ShipRotation*******************************//
//@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@//
//ShipRotateLeft*****************************//
		if(dbLeftKey())                      //
		{                                    //
			dbRotateSprite(4,ShipRotation);  //
			ShipRotation -= 6;               //
		}                                    //
                                             //
//ShipRotateRight****************************//
		if(dbRightKey() )                    //
		{                                    //
			dbRotateSprite(4,ShipRotation);  //
			ShipRotation += 6;               //
		}                                    //
                                             //
//*******************************************//

//ShipBullet*******************************************//

BulletTime = CurrTime;

if(TimeGot == false)
		{
			CurrBulletTime = dbTimer();
			TimeGot = true;
		}
		
			if ( BulletTime - CurrBulletTime >= FireRate)
			{
				dbSprite(BulletCount,dbSpriteX(4),dbSpriteY(4),10);
			TimeGot = false;
			BulletCount++;
			}

dbText(200,200,dbStr(CurrBulletTime));
			dbText(200,250,dbStr(BulletTime));

//**********************************************************

//Asteroids************************************************//

// Timer*************************************//
		dbText(60,60,dbStr(CurrTime));
		dbText(80,80,dbStr(Time));
		dbText(300,20,"Seconds:");
		dbText(370,25,dbStr(Second));
		dbText(300,40,"Minutes:");
		dbText(370,40,dbStr(Minute));

if ( GameStarted == true)
		{
		if ( CurrTime > Time + 1000)
		{
			Second++;
			Time = CurrTime;
		}

if ( Second == 60 )
		{
			Minute++;
			Second = 0;
		}

}
//***************************************//

// update the screen
		dbSync ( );
	}

// return back to windows
	return;
}

+ Code Snippet

#include "DarkGDK.h"





// the main entry point for the application is this function
void DarkGDK ( void )
{

//Flags**************************//
	bool GameStarted = false;    //
	bool GameOver = false;       //
	bool Moving = false;         //
	bool ShipMoving = false;     //
	bool Fireing = false;        //
//*******************************//
bool TimeGot;

//Time Variables*********//
	float CurrTime;      //
	float Time;          //
                         //
	Time = dbTimer();    //
                         //
	int Second = 0;      //
	int Minute = 0;      //
	int Hour   = 0;      //
//***********************//

	
//Ship Varialbes*******************//
	float ShipStartSpeed = 0;      //
	float ShipCurrSpeed = 0;       //
	float ShipMaxSpeed = 10;       //
	float ShipX = 20;              //
	float ShipY = 20;              //
	float Score = 0;               //
	float ShipRotation = 0;        //
	float ShipShield = 650;        //
	float ShipShownShield = 150;   //
	int BulletCount = 51;          //
	int CurrBulletCount = 51;      //
	int FireRate = 300;
	float CurrBulletTime = 0;
	float BulletTime = 0;
//*********************************//



// Frame rate and window setup*************//
	dbSyncOn   ( );                        //
	dbSyncRate ( 60 );                     //
	dbSetWindowSize(1024,768);             //
	dbSetImageColorKey(255,255,255);       //
//*****************************************//


// Curser*********************************//
	dbLoadImage("AsteroidsCurser.bmp",3); //
	dbHideMouse();                        //
//****************************************//


// Start Screen*************************//
dbLoadImage("AsteroidsStartPage.bmp",1);//
	dbSprite(1,0,0,1);                  //
	dbScaleSprite(1,63);                //
	                                    //
	 // Start BTN                       //
	dbLoadImage("StartBtn.bmp",2);      //
	dbSprite(2,308,100,2);              //
//**************************************//


//Asteroids*************************************//
	dbLoadImage("AsteroidPrime1.bmp",11);       //
	dbLoadImage("AsteroidPrime2.bmp",12);       //
	dbLoadImage("AsteroidSub1.bmp",13);         //
	dbLoadImage("AsteroidSub2.bmp",14);         //

// Ship*****************************************//
	dbLoadImage("AsteroidsShipFinal.bmp",4);    //
	dbSprite(4,ShipX,ShipY,4);                  //
	dbOffsetSprite(4,dbSpriteWidth(4) / 2,      //
		dbSpriteHeight(4) / 2);                 //
                                                //
//ShipShield************************************//
	dbLoadImage("AsteroidsShield.bmp",5);       //
	dbSprite(5,ShipX,ShipY,5);                  //
	dbOffsetSprite(5,dbSpriteWidth(5) / 2,      //
		dbSpriteHeight(5) / 2);                 //
	dbHideSprite(5);                            //
//ShipBullet************************************//
	dbLoadImage("AsteroidsBullet.bmp",50);
	//dbSprite(50,70,70,50);
	//dbScaleSprite(50,20);
	//dbOffsetSprite(50,dbSpriteHeight(50) / 2,
		//dbSpriteWidth(50) / 2);
	//dbHideSprite(50);
//**********************************************//

	// our main loop
	while ( LoopGDK ( ) )
	{
		CurrTime = dbTimer();
		dbScaleSprite(4,20);

		if ( GameStarted == false )
		{
		dbHideSprite(4);
		}


		dbSprite(3,dbMouseX(),dbMouseY(),3);

		if ( dbSpriteCollision(2,3) && dbMouseClick())
		{
			GameStarted = true;
			dbHideSprite(1);
			dbHideSprite(2);
		}

		if ( GameStarted == true)
		{
			dbText(10,10,"The game has started");
			dbText(10,25,"Score:");
			dbText(60,25,dbStr(Score));
			dbShowSprite(4);
			dbHideSprite(3);
		}

		if ( ShipCurrSpeed != 0)
		{
			ShipMoving = true;
		}
		else
		{
			ShipMoving = false;
		}

//MoveShip********************************************//
		if ( dbUpKey() && ShipStartSpeed < 10 )
		{
			if ( CurrTime > Time + 10)
			{
				ShipStartSpeed += .2;
			}

		}
		if( dbUpKey() != 1 && ShipCurrSpeed > 0)
		{
			ShipStartSpeed -= .01;
		}

		if ( ShipMoving == true )
		{
			dbMoveSprite(4,ShipCurrSpeed);
		}

		if(ShipStartSpeed < 0)
		{
			ShipStartSpeed = 0;
		}


		ShipCurrSpeed = ShipStartSpeed;
		dbText(50,300,dbStr(ShipCurrSpeed));
		dbText(50,350,dbStr(ShipStartSpeed));

		ShipX = dbSpriteX(4);
		ShipY = dbSpriteY(4);

		if( ShipX > 640 )
		{
			ShipX = 0;
			dbSprite(4,ShipX,ShipY,4);
		}
		if( ShipX < 0 )
		{
			ShipX = 640;
			dbSprite(4,ShipX,ShipY,4);
		}

		if( ShipY > 510)
		{
			ShipY = 0;
			dbSprite(4,ShipX,ShipY,4);
		}
		
		if( ShipY < 0 )
		{
			ShipY = 510;
			dbSprite(4,ShipX,ShipY,4);
		}

		dbText(100,100,dbStr(ShipY));
		dbText(100,150,dbStr(ShipX));


//*****************************************************


//ShipShield***********************************************//
		if ( dbDownKey() && ShipShownShield > 0 )          //
		{                                                  //
			dbSprite(5,dbSpriteX(4),dbSpriteY(4),5);       //
			dbShowSprite(5);                               //
		}                                                  //
		else                                               //
		{                                                  //
			dbHideSprite(5);                               //
		}                                                  //
                                                           //
		dbBox(500,5,ShipShield,10);                        //
		dbText(500,15,"Shield:");                          //
		dbText(560,15,dbStr(ShipShownShield));             //
                                                           //
		if(dbDownKey() == 1)                               //
		{                                                  //
			ShipShownShield -= .2;                         //
			ShipShield -= .2;                              //
		}                                                  //
		else                                               //
		{                                                  //
			if ( ShipShield < 650)                         //
			{                                              //
				ShipShield += .1;                          //
				ShipShownShield += .1;                     //
			}                                              //
		}                                                  //
		if( ShipShownShield < 0)                           //
		{                                                  //
			ShipShownShield = 0;                           //
		}                                                  //
		if(ShipShownShield > 150)                          //
		{                                                  //
			ShipShownShield = 150;                         //
		}                                                  //
		if(ShipShield < 500 )                              //
		{                                                  //
			ShipShield = 501;                              //
		}                                                  //
		if(ShipShield > 650 )                              //
		{                                                  //
			ShipShield = 650;                              //
		}                                                  //
                                                           //
		if ( ShipShownShield == 0)                         //
		{                                                  //
			dbHideSprite(5);                               //
		}                                                  //
                                                           //
//*********************************************************//


//ShipRotation*******************************//
//@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@//
//ShipRotateLeft*****************************//
		if(dbLeftKey())                      //
		{                                    //
			dbRotateSprite(4,ShipRotation);  //
			ShipRotation -= 6;               //
		}                                    //
                                             //
//ShipRotateRight****************************//
		if(dbRightKey() )                    //
		{                                    //
			dbRotateSprite(4,ShipRotation);  //
			ShipRotation += 6;               //
		}                                    //
                                             //
//*******************************************//


//ShipBullet*******************************************//



		BulletTime = CurrTime;

		if(TimeGot == false)
		{
			CurrBulletTime = dbTimer();
			TimeGot = true;
		}
		
			if ( BulletTime - CurrBulletTime >= FireRate)
			{
				dbSprite(BulletCount,dbSpriteX(4),dbSpriteY(4),10);
			TimeGot = false;
			BulletCount++;
			}

			dbText(200,200,dbStr(CurrBulletTime));
			dbText(200,250,dbStr(BulletTime));
		
		





//**********************************************************


//Asteroids************************************************//



// Timer*************************************//
		dbText(60,60,dbStr(CurrTime));
		dbText(80,80,dbStr(Time));
		dbText(300,20,"Seconds:");
		dbText(370,25,dbStr(Second));
		dbText(300,40,"Minutes:");
		dbText(370,40,dbStr(Minute));

		if ( GameStarted == true)
		{
		if ( CurrTime > Time + 1000)
		{
			Second++;
			Time = CurrTime;
		}

		if ( Second == 60 )
		{
			Minute++;
			Second = 0;
		}

		}
//***************************************//
	
		


		// update the screen
		dbSync ( );
	}


	

	// return back to windows
	return;
}

and thanks so much for your help

All is revealed with time.

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negi

13

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Joined: 16th Feb 2011

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Posted: 22nd Dec 2011 22:07

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I figured it out I just had to make a class to manage the sprites for the bullets.

Thanks for your help

All is revealed with time.

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Dark GDK / Help with Making Something Fire at a Cretin rate