dbSpriteCollision with animated Sprite

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FrankieV

14

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Joined: 10th Jun 2010

Location:

Posted: 24th Jun 2010 06:15

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I'm trying to make my sprite collision happen between sprite 3 and sprite "a" here. Sprite "a" supposedly being a copy of sprite "i". Sprite "i" is an animation from a cel sheet, a rather large cel sheet. What I tried to do is create a box (sprite a) that followed each instance of sprite "i" and then formed my collision conditional on whether 3 collided with the box which is drawn to the size of the image in the cel sheet. However, at runtime the collision is always true, obviously due to the large cel sheet. Is there anyway around this? I've thought of making a separate image for each of the 16 frames in the cel sheet, but this seems really inefficient. Some ideas from the GDK Gods is mighty appreciated!

the relevant section is near the end in my playGame function:

#include "DarkGDK.h"

//Constants
const int REFRESH_RATE	= 60;						//screen refresh rate
const DWORD RED		= dbRGB(255, 0, 0);
const DWORD WHITE	= dbRGB(255, 255, 255);
const DWORD BLACK	= dbRGB(0, 0, 0);
int ASTEROID_SPRITE_NUM	= 15;
int ASTEROID_IMAGE_NUM	= 15;

//Class Declaration
class UFO
{
private:

public:

};

//function prototypes
void setUp();
int menu();
//void openInputFile();
void playGame(int difficultyLevel);
//void gameOver();

void DarkGDK (void)
{
	int difficultyLevel;

//Set the window Title
	dbSetWindowTitle("Asteroid Dash!");

setUp();

//dbWaitKey();

menu();

//openInputFile();

playGame(difficultyLevel);

//gameover();

}

void setUp()
{
	dbDisableEscapeKey ();

dbRandomize ( dbTimer () );
	dbSetImageColorKey (0, 255, 0 );

dbLoadImage ("resources\\backdrop.bmp", 1);
	dbLoadImage ("resources\\asteroid.bmp", ASTEROID_IMAGE_NUM);
	dbLoadImage ("resources\\main title.bmp", 3);
	dbLoadImage ("resources\\start button.bmp", 4);
	dbLoadImage ("resources\\spaceship.bmp", 5);
	dbLoadImage ("resources\\explosion.bmp", 6);
	dbLoadImage ("resources\\asteroid boundary.bmp", 7);
	
	dbPasteImage (1, 0, 0, 1);
	dbPasteImage (3, 50, 50, 1);
	dbPasteImage (4, 210, 300, 1);

dbWaitKey();
}

int menu()
{
	int difficultyLevel;
	//int EASY, HARD, IMPOSSIBLE, NIL;
	
	dbInk(RED, BLACK);
	dbSetTextSize(24);
	dbSetTextFont("System");
	dbSetTextToBold();

//instructions for the user
	dbCenterText(319, 120, "SELECT DIFFICULTY");
	dbCenterText(319, 150, "1 = EASY");
	dbCenterText(319, 165, "2 = HARD");
	dbCenterText(319, 180, "3 = IMPOSSIBLE");
	dbCenterText(319, 195, "4 = Exit");
	dbCenterText(319, 210, "");

dbSetTextSize(2);
	//set shape equal to user's input
	difficultyLevel = atoi(dbInput()) ;

dbCLS();

// this is the switch statement which determines the difficulty setting
	switch (difficultyLevel)

{
		//if the user selects 1
		case 1:
			difficultyLevel = 17;
			break;

//if the user selects 2
		case 2:
			difficultyLevel = 27;
			break;

//if the user selects 3
		case 3:
			difficultyLevel = 37;
			break;

//if the user selects 4
		case 4:
			difficultyLevel = 0;
			break;

//in case the user inputs a value outside the indicated range display an 
		//error message
		case 5:
			dbPrint("Error: Please select a difficulty setting!.");
	}
	
	return difficultyLevel;
}

void playGame(int difficultyLevel)
{
	int ufoX = 319;
	int	ufoY = 440;

//int explosionSize	= 50;

//dbPasteImage (1, 0, 0, 1);
	dbSprite (3, 0, 0, 5);
 
	int offsetX = dbSpriteWidth(3) /2;
	int offsetY = dbSpriteHeight(3) /2;
	dbOffsetSprite (3, offsetX, offsetY);
	dbSizeSprite (3, 106, 30);

//dbSprite (3, ufoX, ufoY, 5);

int a;
	int asteroidX = 640;
	int asteroidY = 1500;

//a equals number of asteroid sprites created
	for ( a = ASTEROID_SPRITE_NUM; a < 30; a++ )
	{
		
		dbCreateAnimatedSprite ( a, "resources//asteroid.bmp", 4, 4, a );

// position asteroids at random locations
		dbSprite ( a, dbRnd (asteroidX), -dbRnd (asteroidY), a );
	}

dbSyncOn   ();
	dbSyncRate (REFRESH_RATE);

// now we come to our main loop, we call LoopGDK so some internal
	// work can be carried out by the GDK
	while ( LoopGDK ( ) )
	{
		dbPasteImage (1, 0, 0, 1);

dbSprite (3, ufoX, ufoY, 5);
		dbSprite (a, asteroidX, asteroidX, 7);

for ( int i = ASTEROID_SPRITE_NUM; i < 30; i++ )
		{
			// move the sprite down and play its animation
			// moving from frame 1 to 16 with a delay of 60 ms
			dbMoveSprite ( i, -2 );
			dbPlaySprite ( i, 1, 16, 60 );

// 
			// 
			//if ( dbSpriteY ( i ) > 500 )
			//	dbSprite ( i, dbRnd ( 640 ), -dbRnd ( 1500 ), i );
		}

if ( dbRightKey() )
		{	
			ufoX++;

if ( dbSpaceKey())
			{
				ufoX++*2;
			}	
		}

if ( dbLeftKey() )
		{	
			ufoX--;

if ( dbSpaceKey())
			{
				ufoX--*2;
			}	
		}

if ( dbUpKey() )
		{
			ufoY--;

if ( dbSpaceKey())
			{
				ufoY--*2;
			}	
		}
		if ( dbDownKey())
		{
			ufoY++;
			
			if ( dbSpaceKey())
			{
				ufoY++*2;
			}

}

if ( dbSpriteCollision(3, a));
		{
			dbCenterText(ufoX, ufoY, "YOU CRASHED!");
			//dbSprite(6, ufoX, ufoY,1);
			//dbHideSprite(3);
			//dbSizeSprite (6, explosionSize, explosionSize);

//for ( int i = explosionSize; i < 200; i++ )
			//{
			//	explosionSize++;
			//}

//dbWait(500);
			//dbHideSprite(ASTEROID_SPRITE_NUM);

dbWaitKey();
		}
		
		//escape to break loop
		if ( dbEscapeKey ( ) )
			break;

// here we make a call to update the contents of the screen
		dbSync ( );
	}

// when the user presses escape the code will break out to this location
	// and we can free up any previously allocated resources
	
	//gameOver();

// delete all the sprites
	for ( int i = 1; i < 30; i++ )
		dbDeleteSprite ( i );

// delete images
	dbDeleteImage (1);
	dbDeleteImage (3);
	dbDeleteImage (4);
	dbDeleteImage (5);
	dbDeleteImage (6);

//return back to Windows
	return;

}

+ Code Snippet


#include "DarkGDK.h"

//Constants
const int REFRESH_RATE	= 60;						//screen refresh rate
const DWORD RED		= dbRGB(255, 0, 0);
const DWORD WHITE	= dbRGB(255, 255, 255);
const DWORD BLACK	= dbRGB(0, 0, 0);
int ASTEROID_SPRITE_NUM	= 15;
int ASTEROID_IMAGE_NUM	= 15;


//Class Declaration
class UFO
{
private:

public:

};

//function prototypes
void setUp();
int menu();
//void openInputFile();
void playGame(int difficultyLevel);
//void gameOver();


void DarkGDK (void)
{
	int difficultyLevel;

	//Set the window Title
	dbSetWindowTitle("Asteroid Dash!");

	setUp();

	//dbWaitKey();

	menu();

	//openInputFile();

	playGame(difficultyLevel);

	//gameover();

}

void setUp()
{
	dbDisableEscapeKey ();

	dbRandomize ( dbTimer () );
	dbSetImageColorKey (0, 255, 0 );

	dbLoadImage ("resources\\backdrop.bmp", 1);
	dbLoadImage ("resources\\asteroid.bmp", ASTEROID_IMAGE_NUM);
	dbLoadImage ("resources\\main title.bmp", 3);
	dbLoadImage ("resources\\start button.bmp", 4);
	dbLoadImage ("resources\\spaceship.bmp", 5);
	dbLoadImage ("resources\\explosion.bmp", 6);
	dbLoadImage ("resources\\asteroid boundary.bmp", 7);
	
	dbPasteImage (1, 0, 0, 1);
	dbPasteImage (3, 50, 50, 1);
	dbPasteImage (4, 210, 300, 1);

	dbWaitKey();
}

int menu()
{
	int difficultyLevel;
	//int EASY, HARD, IMPOSSIBLE, NIL;
	
	dbInk(RED, BLACK);
	dbSetTextSize(24);
	dbSetTextFont("System");
	dbSetTextToBold();

	//instructions for the user
	dbCenterText(319, 120, "SELECT DIFFICULTY");
	dbCenterText(319, 150, "1 = EASY");
	dbCenterText(319, 165, "2 = HARD");
	dbCenterText(319, 180, "3 = IMPOSSIBLE");
	dbCenterText(319, 195, "4 = Exit");
	dbCenterText(319, 210, "");

	dbSetTextSize(2);
	//set shape equal to user's input
	difficultyLevel = atoi(dbInput()) ;

	dbCLS();

	// this is the switch statement which determines the difficulty setting
	switch (difficultyLevel)

	{
		//if the user selects 1
		case 1:
			difficultyLevel = 17;
			break;

		//if the user selects 2
		case 2:
			difficultyLevel = 27;
			break;

		//if the user selects 3
		case 3:
			difficultyLevel = 37;
			break;

		//if the user selects 4
		case 4:
			difficultyLevel = 0;
			break;

		//in case the user inputs a value outside the indicated range display an 
		//error message
		case 5:
			dbPrint("Error: Please select a difficulty setting!.");
	}
	
	return difficultyLevel;
}

void playGame(int difficultyLevel)
{
	int ufoX = 319;
	int	ufoY = 440;

	//int explosionSize	= 50;

	//dbPasteImage (1, 0, 0, 1);
	dbSprite (3, 0, 0, 5);
 
	int offsetX = dbSpriteWidth(3) /2;
	int offsetY = dbSpriteHeight(3) /2;
	dbOffsetSprite (3, offsetX, offsetY);
	dbSizeSprite (3, 106, 30);

	//dbSprite (3, ufoX, ufoY, 5);

	int a;
	int asteroidX = 640;
	int asteroidY = 1500;

	//a equals number of asteroid sprites created
	for ( a = ASTEROID_SPRITE_NUM; a < 30; a++ )
	{
		
		dbCreateAnimatedSprite ( a, "resources//asteroid.bmp", 4, 4, a );

		// position asteroids at random locations
		dbSprite ( a, dbRnd (asteroidX), -dbRnd (asteroidY), a );
	}
	


	dbSyncOn   ();
	dbSyncRate (REFRESH_RATE);

	// now we come to our main loop, we call LoopGDK so some internal
	// work can be carried out by the GDK
	while ( LoopGDK ( ) )
	{
		dbPasteImage (1, 0, 0, 1);

		dbSprite (3, ufoX, ufoY, 5);
		dbSprite (a, asteroidX, asteroidX, 7);

		
		for ( int i = ASTEROID_SPRITE_NUM; i < 30; i++ )
		{
			// move the sprite down and play its animation
			// moving from frame 1 to 16 with a delay of 60 ms
			dbMoveSprite ( i, -2 );
			dbPlaySprite ( i, 1, 16, 60 );

			// 
			// 
			//if ( dbSpriteY ( i ) > 500 )
			//	dbSprite ( i, dbRnd ( 640 ), -dbRnd ( 1500 ), i );
		}

		if ( dbRightKey() )
		{	
			ufoX++;

			if ( dbSpaceKey())
			{
				ufoX++*2;
			}	
		}

		
		if ( dbLeftKey() )
		{	
			ufoX--;

			if ( dbSpaceKey())
			{
				ufoX--*2;
			}	
		}

		
		if ( dbUpKey() )
		{
			ufoY--;

			if ( dbSpaceKey())
			{
				ufoY--*2;
			}	
		}
		if ( dbDownKey())
		{
			ufoY++;
			
			if ( dbSpaceKey())
			{
				ufoY++*2;
			}	

		}

		if ( dbSpriteCollision(3, a));
		{
			dbCenterText(ufoX, ufoY, "YOU CRASHED!");
			//dbSprite(6, ufoX, ufoY,1);
			//dbHideSprite(3);
			//dbSizeSprite (6, explosionSize, explosionSize);

			//for ( int i = explosionSize; i < 200; i++ )
			//{
			//	explosionSize++;
			//}

			//dbWait(500);
			//dbHideSprite(ASTEROID_SPRITE_NUM);

			dbWaitKey();
		}
		
		//escape to break loop
		if ( dbEscapeKey ( ) )
			break;

		// here we make a call to update the contents of the screen
		dbSync ( );
	}

	// when the user presses escape the code will break out to this location
	// and we can free up any previously allocated resources
	
	//gameOver();

	// delete all the sprites
	for ( int i = 1; i < 30; i++ )
		dbDeleteSprite ( i );

	// delete images
	dbDeleteImage (1);
	dbDeleteImage (3);
	dbDeleteImage (4);
	dbDeleteImage (5);
	dbDeleteImage (6);

	//return back to Windows
	return;

}

One more thing...I can't figure out how to return the int value "difficultyLevel" from the menu function. I need to pass this back to the playGame function so I can control how many asteroids are created within the game loop.

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Bran flakes91093

15

Years of Service

User Offline

Joined: 13th Sep 2008

Location: Crazy Land

Posted: 24th Jun 2010 19:13 Edited at: 24th Jun 2010 19:16

Link

1 - This:

+ Code Snippet

if ( dbRightKey() )
		{	
			ufoX++;

			if ( dbSpaceKey())
			{
				ufoX++*2; // <-----
			}	
		}

will still only increment it by one. If you want to increment/decrement a value more than one digit, use the +=/-= operators. ex. "ufoX += 2;"

2 -

+ Code Snippet

switch (difficultyLevel)

	{
		//if the user selects 1
		case 1:
			difficultyLevel = 17;
			break;

		//if the user selects 2
		case 2:
			difficultyLevel = 27;
			break;

		//if the user selects 3
		case 3:
			difficultyLevel = 37;
			break;

		//if the user selects 4
		case 4:
			difficultyLevel = 0;
			break;

		//in case the user inputs a value outside the indicated range display an 
		//error message
		case 5: // <---- Change this to "default:"
			dbPrint("Error: Please select a difficulty setting!.");
	}

"Case 5" will only be called if the user enters '5', so use the "default" keyword to catch any input that isn't caught by any other cases.

3 - Here,

+ Code Snippet

void DarkGDK (void)
{
	int difficultyLevel;

	//Set the window Title
	dbSetWindowTitle("Asteroid Dash!");

	setUp();

	//dbWaitKey();

	menu(); // <--- change to "difficultyLevel = menu();"

	//openInputFile();

	playGame(difficultyLevel);

	//gameover();

}

you have "difficultyLevel decalared as a local variable, so, menu() cannot change the value of it directly. But, you return menu()'s difficultyLevel, so just replace "menu();" with "difficultyLevel = menu();", and you will have the value of difficultyLevel in playGame().

4 - For collision, you seem to be doing it right, but there is one fatal mistake:

+ Code Snippet

if ( dbSpriteCollision(3, a)); // <------ Get rid of the semicolon, it makes the if an empty statement.
		{
			dbCenterText(ufoX, ufoY, "YOU CRASHED!");
			//dbSprite(6, ufoX, ufoY,1);
			//dbHideSprite(3);
			//dbSizeSprite (6, explosionSize, explosionSize);

			//for ( int i = explosionSize; i < 200; i++ )
			//{
			//	explosionSize++;
			//}

			//dbWait(500);
			//dbHideSprite(ASTEROID_SPRITE_NUM);

			dbWaitKey();
		}

The semicolon there makes the if an empty statement, so the compiler ignores it, effectively making collision true each loop.

“C++ : Where friends have access to your private members.”
-Gavin Russell Baker

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FrankieV

14

Years of Service

User Offline

Joined: 10th Jun 2010

Location:

Posted: 25th Jun 2010 07:53

Link

Everything worked except the collision detection.

I have evolved the program quite a bit now.
It's currently:

#include "DarkGDK.h"

#include <string.h>

//Constants
const int REFRESH_RATE	= 60;						//screen refresh rate

const DWORD RED		= dbRGB(255, 0, 0);
const DWORD WHITE	= dbRGB(255, 255, 255);
const DWORD BLACK	= dbRGB(0, 0, 0);

const int ASTEROID_SPRITE_NUM		= 15;
const int ASTEROID_IMAGE_NUM		= 15;
const int START_BUTTON_SPRITE_NUM	= 1;
const int STARTS_X					= 265;
const int STARTS_Y					= 350;

const int FILE_NUM = 1;
const int WORD_SIZE = 30;
char playerName[WORD_SIZE];
char player1[WORD_SIZE];

//Class Declaration
class UFO
{
private:

public:

};

//function prototypes
void setUp();
bool onSprite(int, int, int);
bool mouseFullClick(int &, int&);
int menu();
void getInput(char[]);
void playGame(int);
char openInputFile();
void gameOver(char[]);

void DarkGDK (void)
{
	//Set the window Title
	dbSetWindowTitle("Asteroid Dash!");

dbLoadSound("resources\\music.wav",1);

int difficultyLevel, mouseX, mouseY;

//dbSyncOn   ();
	//dbSyncRate (REFRESH_RATE);

setUp();

/*if ( dbMouseClick() == 1)
	{
		if ( onSprite(START_BUTTON_SPRITE_NUM, mouseX, mouseY) )
		{
			dbCLS();

for ( int i = 1; i < 3; i++ )
			{
				dbDeleteSprite (i);
			}
		}
	}*/
	
	menu();

playGame(difficultyLevel);

openInputFile();

gameOver(player1);

}

void setUp()
{
	dbDisableEscapeKey ();

dbRandomize ( dbTimer () );

dbSetImageColorKey (0, 255, 0 );

dbLoopSound(1);

dbLoadImage ("resources\\backdrop.bmp", 1);
	dbLoadImage ("resources\\asteroid.bmp", ASTEROID_IMAGE_NUM);
	dbLoadImage ("resources\\main title.bmp", 3);
	dbLoadImage ("resources\\start button.bmp", 4);
	dbLoadImage ("resources\\spaceship.bmp", 5);
	dbLoadImage ("resources\\explosion.bmp", 6);
	dbLoadImage ("resources\\asteroid boundary.bmp", 7);
	
	dbSprite (3, 0, 0, 1);
	dbSprite (2, 55, 50, 3);
	dbSprite (START_BUTTON_SPRITE_NUM, STARTS_X, STARTS_Y, 4);

dbLoadSound("resources\\ufo.wav",2);
	dbLoadSound("resources\\explosion.wav",3);
	dbLoadSound("resources\\game over.wav",4);

dbWaitKey();

for ( int i = 1; i < 3; i++ )
	{
		dbDeleteSprite (i);
	}
}

bool onSprite(int spriteNum, int pointX, int pointY)
{
	bool insideSprite;

int upperX = dbSpriteX(spriteNum) - dbSpriteOffsetX(spriteNum);
	int upperY = dbSpriteY(spriteNum) - dbSpriteOffsetY(spriteNum);

int lowerX = upperX + dbSpriteWidth(spriteNum);
	int lowerY = upperY + dbSpriteHeight(spriteNum);

if( pointX >= upperX && pointY >= upperY && pointX <= lowerX && pointY <= lowerY )
	{
		insideSprite = true;
	}
	else
	{
		insideSprite = false;
	}

return insideSprite;
}

bool mouseFullClick(int &x, int &y)
{
	//
	bool buttonClick = false;

if ( dbMouseClick() == 1)
	{
		x = dbMouseX();
		y = dbMouseY();

while ( dbMouseClick() == 1)
		{
			//do nothing
		}

buttonClick = true;

}

return buttonClick;
}

int menu()
{
	int difficultyLevel;
	
	dbInk(RED, BLACK);
	dbSetTextSize(36);
	dbSetTextFont("System");
	dbSetTextToBold();

//instructions for the user
	dbCenterText(319, 120, "SELECT DIFFICULTY");
	dbCenterText(319, 170, "1 = EASY");
	dbCenterText(319, 200, "2 = HARD");
	dbCenterText(319, 230, "3 = IMPOSSIBLE");
	dbCenterText(319, 260, "4 = Exit");

dbSetTextSize(2);
	//set shape equal to user's input
	difficultyLevel = atoi(dbInput()) ;

dbCLS();

// this switch statement determines the difficulty setting
	switch (difficultyLevel)

{
		//if the user selects 1
		case 1:
			difficultyLevel = 20;
			break;

//if the user selects 2
		case 2:
			difficultyLevel = 25;
			break;

//if the user selects 3
		case 3:
			difficultyLevel = 30;
			break;

//if the user selects 4
		case 4:
			difficultyLevel = 0;
			break;
			//gameover();

//in case the user inputs a value outside the indicated range display an 
		//error message
		default:
			dbPrint("Error: Please select a difficulty setting!.");
	}
	
	return difficultyLevel;
}

void getInput()
{
	/*Check if the file players_name.dat exists, if so delete it, and open 
	an output file to store the players name.*/
	if(dbFileExist("players_name.dat"))
	{
		//If the players_name.dat exists delete it.
		dbDeleteFile("players_name.dat");

//and open an output file to store the player's name
		dbOpenToWrite(FILE_NUM, "players_name.dat");
	}
	else //If the file does not exist open output file
	{
		dbOpenToWrite(FILE_NUM, "players_name.dat");
	}

dbInk(RED, BLACK);
	dbSetTextSize(36);
	dbSetTextFont("System");
	dbSetTextToBold();

// Get the player's name.
	dbCenterText(319, 120, "Please type your name and hit enter.");
    strcpy(playerName, dbInput() );

if ( dbReturnKey())
	{
	dbWriteFile(FILE_NUM, playerName[WORD_SIZE]);
	}

//close output file.
	dbCloseFile(FILE_NUM);

//clear the screen.
	dbCLS();

}
/*The openInputFile function checks if the players_name.dat input file exists
and opens it. If file does not exist, display an error message.*/

void playGame(int difficultyLevel)
{
	dbCLS();
	dbStopSound(1);

int ufoX = 319;
	int	ufoY = 440;

dbSprite (4, 0, 0, 5);
 
	int offsetX = dbSpriteWidth(4) /2;
	int offsetY = dbSpriteHeight(4) /2;
	dbOffsetSprite (4, offsetX, offsetY);
	dbSizeSprite (4, 106, 30);

int a;
	int asteroidX = 640;
	int asteroidY = 480;

//a equals number of asteroid sprites created
	for ( a = ASTEROID_SPRITE_NUM; a < difficultyLevel; a++ )
	{
		dbCreateAnimatedSprite ( a, "resources//asteroid.bmp", 4, 4, a );

// position asteroids at random locations
		dbSprite ( a, dbRnd (asteroidX), -dbRnd (asteroidY), a );
	}
	
	dbSyncOn   ();
	dbSyncRate (REFRESH_RATE);

// now we come to our main loop, we call LoopGDK so some internal
	while ( LoopGDK () )
	{
		dbPasteImage (1, 0, 0, 1);

dbSprite (4, ufoX, ufoY, 5);
		dbSprite (a, asteroidX, asteroidY, 7);

for ( int i = ASTEROID_SPRITE_NUM; i < 30; i++ )
		{
			// move the sprite down and play its animation
			// moving from frame 1 to 16 with a delay of 60 ms
			dbMoveSprite ( i, -2 );
			dbPlaySprite ( i, 1, 16, 60 );

//reposition asteroid sprite if it goes off the screen
			if ( dbSpriteY ( i ) > 480 )
			{
				dbSprite ( i, dbRnd (asteroidX), -dbRnd (asteroidY), i );
			}
		}

if ( dbRightKey() )
		{	
			dbPlaySound(2);
			ufoX++;

if ( dbSpaceKey())
			{
				ufoX += 5;
			}	
		}

if ( dbLeftKey() )
		{	
			dbPlaySound(2);
			ufoX--;

if ( dbSpaceKey())
			{
				ufoX -= 5;
 			}	
		}

if ( dbUpKey() )
		{
			dbPlaySound(2);
			ufoY--;

if ( dbSpaceKey())
			{
				ufoY -= 5;
			}	
		}
		if ( dbDownKey())
		{
			dbPlaySound(2);
			ufoY++;
			
			
			if ( dbSpaceKey())
			{
				ufoY += 5;
			}

}

if ( dbSpriteCollision(4, a))
		{
			dbPlaySound(3);
			dbCenterText(ufoX, ufoY, "YOU CRASHED!");
			//dbSprite(6, ufoX, ufoY,1);
			//dbHideSprite(3);
			//dbSizeSprite (6, explosionSize, explosionSize);

//for ( int i = explosionSize; i < 200; i++ )
			//{
			//	explosionSize++;
			//}

//dbWait(500);
			//dbHideSprite(ASTEROID_SPRITE_NUM);

dbWaitKey();
		}
		
		//escape to break loop
		if ( dbEscapeKey ( ) )
			break;

// here we make a call to update the contents of the screen
		dbSync ( );
	}
}

char openInputFile()
{
	char player1 [WORD_SIZE];

//Check if the coordinates.dat file exists.
	if(dbFileExist("players_name.dat") )
	{
		//Open the input file.
		dbOpenToRead(FILE_NUM, "players_name.dat");
	}
	else
	{
		//Print an error message.
		dbPrint("Error! The file does not exist.");	
	}

if(!dbFileEnd(FILE_NUM))
	{
		//Set the pointers X and Y coordinates from the input file
		player1 [WORD_SIZE] = dbReadFile(FILE_NUM);
	}

return player1[WORD_SIZE];

//Close the Input File.
	dbCloseFile(FILE_NUM);
}

void gameOver(char name[])
{
	const int LINE_SIZE = 200;

//arrays for the lines of output
    char line1[LINE_SIZE];

dbInk(RED, BLACK);
	dbSetTextSize(36);
	dbSetTextFont("System");
	dbSetTextToBold();

//instructions for the user
	strcpy( line1, "Great job ");
    strcat( line1, name );
    strcat( line1, " , you sure can fly!");

// delete all the sprites, images and sound files
	for ( int i = 1; i < 30; i++ )
	{
		dbDeleteSprite (i);
		dbDeleteImage (i);
		dbDeleteSound (i);
	}

//Prompt the user to press any key to exit the program.
	dbCenterText(319, 450, "press any key To exit");

dbWaitKey();
	//return back to Windows
	return;
}

+ Code Snippet


#include "DarkGDK.h"

#include <string.h>

//Constants
const int REFRESH_RATE	= 60;						//screen refresh rate

const DWORD RED		= dbRGB(255, 0, 0);
const DWORD WHITE	= dbRGB(255, 255, 255);
const DWORD BLACK	= dbRGB(0, 0, 0);

const int ASTEROID_SPRITE_NUM		= 15;
const int ASTEROID_IMAGE_NUM		= 15;
const int START_BUTTON_SPRITE_NUM	= 1;
const int STARTS_X					= 265;
const int STARTS_Y					= 350;

const int FILE_NUM = 1;
const int WORD_SIZE = 30;
char playerName[WORD_SIZE];
char player1[WORD_SIZE];

//Class Declaration
class UFO
{
private:

public:

};

//function prototypes
void setUp();
bool onSprite(int, int, int);
bool mouseFullClick(int &, int&);
int menu();
void getInput(char[]);
void playGame(int);
char openInputFile();
void gameOver(char[]);


void DarkGDK (void)
{
	//Set the window Title
	dbSetWindowTitle("Asteroid Dash!");

	dbLoadSound("resources\\music.wav",1);

	int difficultyLevel, mouseX, mouseY;

	//dbSyncOn   ();
	//dbSyncRate (REFRESH_RATE);

	setUp();

	/*if ( dbMouseClick() == 1)
	{
		if ( onSprite(START_BUTTON_SPRITE_NUM, mouseX, mouseY) )
		{
			dbCLS();

			for ( int i = 1; i < 3; i++ )
			{
				dbDeleteSprite (i);
			}
		}
	}*/
	
	menu();


	playGame(difficultyLevel);

	
	openInputFile();


	gameOver(player1);

}

void setUp()
{
	dbDisableEscapeKey ();

	dbRandomize ( dbTimer () );

	dbSetImageColorKey (0, 255, 0 );

	dbLoopSound(1);

	dbLoadImage ("resources\\backdrop.bmp", 1);
	dbLoadImage ("resources\\asteroid.bmp", ASTEROID_IMAGE_NUM);
	dbLoadImage ("resources\\main title.bmp", 3);
	dbLoadImage ("resources\\start button.bmp", 4);
	dbLoadImage ("resources\\spaceship.bmp", 5);
	dbLoadImage ("resources\\explosion.bmp", 6);
	dbLoadImage ("resources\\asteroid boundary.bmp", 7);
	
	dbSprite (3, 0, 0, 1);
	dbSprite (2, 55, 50, 3);
	dbSprite (START_BUTTON_SPRITE_NUM, STARTS_X, STARTS_Y, 4);

	dbLoadSound("resources\\ufo.wav",2);
	dbLoadSound("resources\\explosion.wav",3);
	dbLoadSound("resources\\game over.wav",4);

	dbWaitKey();

	for ( int i = 1; i < 3; i++ )
	{
		dbDeleteSprite (i);
	}
}

bool onSprite(int spriteNum, int pointX, int pointY)
{
	bool insideSprite;

	int upperX = dbSpriteX(spriteNum) - dbSpriteOffsetX(spriteNum);
	int upperY = dbSpriteY(spriteNum) - dbSpriteOffsetY(spriteNum);

	int lowerX = upperX + dbSpriteWidth(spriteNum);
	int lowerY = upperY + dbSpriteHeight(spriteNum);

	if( pointX >= upperX && pointY >= upperY && pointX <= lowerX && pointY <= lowerY )
	{
		insideSprite = true;
	}
	else
	{
		insideSprite = false;
	}

	return insideSprite;
}

bool mouseFullClick(int &x, int &y)
{
	//
	bool buttonClick = false;

	if ( dbMouseClick() == 1)
	{
		x = dbMouseX();
		y = dbMouseY();

		while ( dbMouseClick() == 1)
		{
			//do nothing
		}

	buttonClick = true;

	}

	return buttonClick;
}

int menu()
{
	int difficultyLevel;
	
	dbInk(RED, BLACK);
	dbSetTextSize(36);
	dbSetTextFont("System");
	dbSetTextToBold();

	//instructions for the user
	dbCenterText(319, 120, "SELECT DIFFICULTY");
	dbCenterText(319, 170, "1 = EASY");
	dbCenterText(319, 200, "2 = HARD");
	dbCenterText(319, 230, "3 = IMPOSSIBLE");
	dbCenterText(319, 260, "4 = Exit");

	dbSetTextSize(2);
	//set shape equal to user's input
	difficultyLevel = atoi(dbInput()) ;

	dbCLS();

	// this switch statement determines the difficulty setting
	switch (difficultyLevel)

	{
		//if the user selects 1
		case 1:
			difficultyLevel = 20;
			break;

		//if the user selects 2
		case 2:
			difficultyLevel = 25;
			break;

		//if the user selects 3
		case 3:
			difficultyLevel = 30;
			break;

		//if the user selects 4
		case 4:
			difficultyLevel = 0;
			break;
			//gameover();

		//in case the user inputs a value outside the indicated range display an 
		//error message
		default:
			dbPrint("Error: Please select a difficulty setting!.");
	}
	
	return difficultyLevel;
}

void getInput()
{
	/*Check if the file players_name.dat exists, if so delete it, and open 
	an output file to store the players name.*/
	if(dbFileExist("players_name.dat"))
	{
		//If the players_name.dat exists delete it.
		dbDeleteFile("players_name.dat");

		//and open an output file to store the player's name
		dbOpenToWrite(FILE_NUM, "players_name.dat");
	}
	else //If the file does not exist open output file
	{
		dbOpenToWrite(FILE_NUM, "players_name.dat");
	}

	dbInk(RED, BLACK);
	dbSetTextSize(36);
	dbSetTextFont("System");
	dbSetTextToBold();

	// Get the player's name.
	dbCenterText(319, 120, "Please type your name and hit enter.");
    strcpy(playerName, dbInput() );

	if ( dbReturnKey())
	{
	dbWriteFile(FILE_NUM, playerName[WORD_SIZE]);
	}

	//close output file.
	dbCloseFile(FILE_NUM);

	//clear the screen.
	dbCLS();

}
/*The openInputFile function checks if the players_name.dat input file exists
and opens it. If file does not exist, display an error message.*/

void playGame(int difficultyLevel)
{
	dbCLS();
	dbStopSound(1);

	int ufoX = 319;
	int	ufoY = 440;

	dbSprite (4, 0, 0, 5);
 
	int offsetX = dbSpriteWidth(4) /2;
	int offsetY = dbSpriteHeight(4) /2;
	dbOffsetSprite (4, offsetX, offsetY);
	dbSizeSprite (4, 106, 30);

	int a;
	int asteroidX = 640;
	int asteroidY = 480;

	//a equals number of asteroid sprites created
	for ( a = ASTEROID_SPRITE_NUM; a < difficultyLevel; a++ )
	{
		dbCreateAnimatedSprite ( a, "resources//asteroid.bmp", 4, 4, a );

		// position asteroids at random locations
		dbSprite ( a, dbRnd (asteroidX), -dbRnd (asteroidY), a );
	}
	
	dbSyncOn   ();
	dbSyncRate (REFRESH_RATE);

	// now we come to our main loop, we call LoopGDK so some internal
	while ( LoopGDK () )
	{
		dbPasteImage (1, 0, 0, 1);

		dbSprite (4, ufoX, ufoY, 5);
		dbSprite (a, asteroidX, asteroidY, 7);

		for ( int i = ASTEROID_SPRITE_NUM; i < 30; i++ )
		{
			// move the sprite down and play its animation
			// moving from frame 1 to 16 with a delay of 60 ms
			dbMoveSprite ( i, -2 );
			dbPlaySprite ( i, 1, 16, 60 );

			//reposition asteroid sprite if it goes off the screen
			if ( dbSpriteY ( i ) > 480 )
			{
				dbSprite ( i, dbRnd (asteroidX), -dbRnd (asteroidY), i );
			}
		}

		if ( dbRightKey() )
		{	
			dbPlaySound(2);
			ufoX++;
			

			if ( dbSpaceKey())
			{
				ufoX += 5;
			}	
		}

		
		if ( dbLeftKey() )
		{	
			dbPlaySound(2);
			ufoX--;
			

			if ( dbSpaceKey())
			{
				ufoX -= 5;
 			}	
		}

		
		if ( dbUpKey() )
		{
			dbPlaySound(2);
			ufoY--;
			

			if ( dbSpaceKey())
			{
				ufoY -= 5;
			}	
		}
		if ( dbDownKey())
		{
			dbPlaySound(2);
			ufoY++;
			
			
			if ( dbSpaceKey())
			{
				ufoY += 5;
			}	

		}

		if ( dbSpriteCollision(4, a))
		{
			dbPlaySound(3);
			dbCenterText(ufoX, ufoY, "YOU CRASHED!");
			//dbSprite(6, ufoX, ufoY,1);
			//dbHideSprite(3);
			//dbSizeSprite (6, explosionSize, explosionSize);

			//for ( int i = explosionSize; i < 200; i++ )
			//{
			//	explosionSize++;
			//}

			//dbWait(500);
			//dbHideSprite(ASTEROID_SPRITE_NUM);

			dbWaitKey();
		}
		
		//escape to break loop
		if ( dbEscapeKey ( ) )
			break;

		// here we make a call to update the contents of the screen
		dbSync ( );
	}
}

char openInputFile()
{
	char player1 [WORD_SIZE];

	//Check if the coordinates.dat file exists.
	if(dbFileExist("players_name.dat") )
	{
		//Open the input file.
		dbOpenToRead(FILE_NUM, "players_name.dat");
	}
	else
	{
		//Print an error message.
		dbPrint("Error! The file does not exist.");	
	}

	if(!dbFileEnd(FILE_NUM))
	{
		//Set the pointers X and Y coordinates from the input file
		player1 [WORD_SIZE] = dbReadFile(FILE_NUM);
	}

	return player1[WORD_SIZE];

	//Close the Input File.
	dbCloseFile(FILE_NUM);
}


void gameOver(char name[])
{
	const int LINE_SIZE = 200;

    //arrays for the lines of output
    char line1[LINE_SIZE];

	dbInk(RED, BLACK);
	dbSetTextSize(36);
	dbSetTextFont("System");
	dbSetTextToBold();

	//instructions for the user
	strcpy( line1, "Great job ");
    strcat( line1, name );
    strcat( line1, " , you sure can fly!");

	// delete all the sprites, images and sound files
	for ( int i = 1; i < 30; i++ )
	{
		dbDeleteSprite (i);
		dbDeleteImage (i);
		dbDeleteSound (i);
	}

	//Prompt the user to press any key to exit the program.
	dbCenterText(319, 450, "press any key To exit");

	dbWaitKey();
	//return back to Windows
	return;
}

Unfortunately, that comes with more problems. The mouseClick and onSprite functions do nothing. And now, the menu wont even display. I get the three sprites for the intro screen, but nothing afterwards. Everything has gone haywire. I need to make sure the string input and file writing are working, and I need to move the ufo sprite into the ufo class along with its appropriate data and methods.

I have the if statement for the mouse detection commented out because it wouldn't work. The rest quit on me after the addition of the getInput and openInputFile functions. This is due in 12 hours and I'm starting to think I dont have a chance.

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Bran flakes91093

15

Years of Service

User Offline

Joined: 13th Sep 2008

Location: Crazy Land

Posted: 25th Jun 2010 18:35

Link

+ Code Snippet

	
	menu(); // <-- Change to difficultyLevel = menu();


	playGame(difficultyLevel);

To write/read a string to/from a file, use dbWriteString()/dbReadString() instead of dbWriteFile()/dbReadFile().

The documentation for DarkGDK is here: C:\Program Files\The Game Creators\Dark GDK\Documentation\Dark GDK.chm

+ Code Snippet

if ( dbReturnKey())
	{
	dbWriteFile(FILE_NUM, playerName[WORD_SIZE]); // You are writing a char here
        // Use dbWriteString(FILE_NUM, playerName); // Write the entire string to the file
	}

Here,

+ Code Snippet

char openInputFile() // <-- Return char* instead
{
	char player1 [WORD_SIZE];

	//Check if the coordinates.dat file exists.
	if(dbFileExist("players_name.dat") )
	{
		//Open the input file.
		dbOpenToRead(FILE_NUM, "players_name.dat");
	}
	else
	{
		//Print an error message.
		dbPrint("Error! The file does not exist.");	
	}

	if(!dbFileEnd(FILE_NUM))
	{
		//Set the pointers X and Y coordinates from the input file
		player1 [WORD_SIZE] = dbReadFile(FILE_NUM); // <-- Change to dbReadString();
	}

	return player1[WORD_SIZE]; // <-- change to return player1;

	//Close the Input File.
	dbCloseFile(FILE_NUM);
}

you are returning a char, instead of the string. http://cplusplus.com/doc/tutorial/ntcs/
In addition, the string is local and will destruct itself before the function returns, so either make it global, or use dynamic memory. http://cplusplus.com/doc/tutorial/dynamic/

Sorry, that's all I can do right now, and I'll be busy until sometime tomorrow. Good luck with your project.

“C++ : Where friends have access to your private members.”
-Gavin Russell Baker

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Dark GDK / dbSpriteCollision with animated Sprite