Zombie Sprite Collision Help - GameCreators Forum

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FireIndy

17

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Joined: 17th Jan 2007

Location: US of A

Posted: 9th Jun 2011 23:53 Edited at: 9th Jun 2011 23:59

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I recently started working on my 2d top down zombie shooter again. I am having some issues trying to get my collision between zombies to work correctly. The collision between zombies is handled in Main.cpp. I'm right now just trying to make sure that they both are hitting. Currently with this code, if 2 zombies overlap, then 1 of them has "HIT" above their head. However, I want both to have that, so I can move both of them after they collide. Here\'s my code:

Main.cpp

//ZOMBIE SHOOTER BY DAVID KRAMER
//WHEN ADDING MAP, ADD IMAGE IN setupGame() AND loadimages()!
#include "DarkGDK.h"
#include "Player.h"
#include "Zombie.h"

void DarkGDK ( void )
{
	
	//======================FUNCTION PROTOTYPES===============//
	void healthBar(float playerNumHealth);
	void loadImages();
	void loadSounds();
	void setupGame();
	//==========================================================//

//========================GAME SETUP========================//
	//Call first!
	setupGame();

//Zombie amount constant
	const int ZOMBIE_AMOUNT = 6;
	//Arrays
	Zombie* zombArray = new Zombie[ZOMBIE_AMOUNT];

//Player object
	Player Pone(1);
	Pone.Xpos = 300;
	Pone.Ypos = 300;
	Pone.name = "Dave";
	dbSetSpritePriority(Pone.spriteNum,2);

//Zombie set init positions
	for(int i = 0; i <= ZOMBIE_AMOUNT; i++)
	{
		zombArray[i].Xpos = (rand() % dbScreenWidth());
		zombArray[i].Ypos = (rand() % dbScreenHeight());
		dbSetSpritePriority(zombArray[i].spriteNum,1);
	}
	//==========================================================//

while ( LoopGDK ( ) )
	{
	
		//Player controls
		Pone.moveSprite();

//Zombie Sprite
		for(int i = 0; i <= ZOMBIE_AMOUNT - 1; i++)
		{
			if (dbSpriteCollision(zombArray[i].spriteNum, Pone.spriteNum))
			{
				//Dec health and stop moving
				if( Pone.health >= 0 )
				{
					Pone.health = Pone.health - .25;
				}
				//moan
				zombArray[i].moan();
			}
			//Collision between 1 zombie against all other zombies
			for(int k = 0; k <= ZOMBIE_AMOUNT - 1; k++)
			{
				if (dbSpriteCollision(zombArray[k].spriteNum, zombArray[i].spriteNum))
				{
					if( zombArray[k].spriteNum != zombArray[i].spriteNum )
					{
						zombArray[i].text = "HIT";
						zombArray[k].text = "HIT";
						/*
						if( zombArray[i].Xpos >= zombArray[k].Xpos && zombArray[i].Ypos >= zombArray[k].Ypos )
						{
							zombArray[k].Xpos = zombArray[k].Xpos + zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos + zombArray[k].speed;
						}else if( zombArray[i].Xpos <= zombArray[k].Xpos && zombArray[i].Ypos <= zombArray[k].Ypos )
						{
							zombArray[k].Xpos = zombArray[k].Xpos - zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos - zombArray[k].speed;
						}else if ( zombArray[i].Xpos <= zombArray[k].Xpos && zombArray[i].Ypos >= zombArray[k].Ypos ) 
						{
							zombArray[k].Xpos = zombArray[k].Xpos - zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos + zombArray[k].speed;
						}else if ( zombArray[i].Xpos >= zombArray[k].Xpos && zombArray[i].Ypos <= zombArray[k].Ypos )
						{
							zombArray[k].Xpos = zombArray[k].Xpos + zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos - zombArray[k].speed;
						}
						*/
					}else{
						zombArray[i].text = "";
						zombArray[k].text = "";
					}
				}
			}

zombArray[i].moveSprite(Pone.Xpos,Pone.Ypos);

}

//Health Bar
		healthBar(Pone.health);
		
		//Sync
		dbSync();
}

return;
}

void healthBar(float playerNumHealth)
{
	//Health bar function
	dbBox(10,10,playerNumHealth,20,dbRGB(255,0,0),dbRGB(255,0,0),dbRGB(0,255,0),dbRGB(0,255,0));
	dbText(35,25,dbStr(playerNumHealth));
	dbText(10,25,"HP: ");
}

void loadImages()
{
	//load images
	dbLoadImage("images/playerbase.png",1);
	dbLoadImage("images/zombiebase.png",2);
	dbLoadImage("images/level1.png",3);
}

void loadSounds()
{
	//load images
	dbLoadSound("sounds/zombie groan 1.wav",1);
}
void setupGame()
{
	//GDK setup
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	dbRandomize ( dbTimer ( ) );
	//dbHideMouse();
	dbSetDisplayMode(800,600,32);
	dbSetWindowSize(800,600);
	dbSetWindowTitle("ZOMBIE SHOOTER");
	//Draw Sprites First
	dbDrawSpritesFirst();
	//load the images
	loadImages();
	//load sounds
	loadSounds();
	//Background Image
	dbSprite(2,0,0,3);

//Drawn first
	//dbSetSpritePriority(2,0);

}

+ Code Snippet



//ZOMBIE SHOOTER BY DAVID KRAMER
//WHEN ADDING MAP, ADD IMAGE IN setupGame() AND loadimages()!
#include "DarkGDK.h"
#include "Player.h"
#include "Zombie.h"

void DarkGDK ( void )
{
	
	//======================FUNCTION PROTOTYPES===============//
	void healthBar(float playerNumHealth);
	void loadImages();
	void loadSounds();
	void setupGame();
	//==========================================================//

	//========================GAME SETUP========================//
	//Call first!
	setupGame();

	//Zombie amount constant
	const int ZOMBIE_AMOUNT = 6;
	//Arrays
	Zombie* zombArray = new Zombie[ZOMBIE_AMOUNT];

	//Player object
	Player Pone(1);
	Pone.Xpos = 300;
	Pone.Ypos = 300;
	Pone.name = "Dave";
	dbSetSpritePriority(Pone.spriteNum,2);

	//Zombie set init positions
	for(int i = 0; i <= ZOMBIE_AMOUNT; i++)
	{
		zombArray[i].Xpos = (rand() % dbScreenWidth());
		zombArray[i].Ypos = (rand() % dbScreenHeight());
		dbSetSpritePriority(zombArray[i].spriteNum,1);
	}
	//==========================================================//


	while ( LoopGDK ( ) )
	{
	
		//Player controls
		Pone.moveSprite();

		//Zombie Sprite
		for(int i = 0; i <= ZOMBIE_AMOUNT - 1; i++)
		{
			if (dbSpriteCollision(zombArray[i].spriteNum, Pone.spriteNum))
			{
				//Dec health and stop moving
				if( Pone.health >= 0 )
				{
					Pone.health = Pone.health - .25;
				}
				//moan
				zombArray[i].moan();
			}
			//Collision between 1 zombie against all other zombies
			for(int k = 0; k <= ZOMBIE_AMOUNT - 1; k++)
			{
				if (dbSpriteCollision(zombArray[k].spriteNum, zombArray[i].spriteNum))
				{
					if( zombArray[k].spriteNum != zombArray[i].spriteNum )
					{
						zombArray[i].text = "HIT";
						zombArray[k].text = "HIT";
						/*
						if( zombArray[i].Xpos >= zombArray[k].Xpos && zombArray[i].Ypos >= zombArray[k].Ypos )
						{
							zombArray[k].Xpos = zombArray[k].Xpos + zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos + zombArray[k].speed;
						}else if( zombArray[i].Xpos <= zombArray[k].Xpos && zombArray[i].Ypos <= zombArray[k].Ypos )
						{
							zombArray[k].Xpos = zombArray[k].Xpos - zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos - zombArray[k].speed;
						}else if ( zombArray[i].Xpos <= zombArray[k].Xpos && zombArray[i].Ypos >= zombArray[k].Ypos ) 
						{
							zombArray[k].Xpos = zombArray[k].Xpos - zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos + zombArray[k].speed;
						}else if ( zombArray[i].Xpos >= zombArray[k].Xpos && zombArray[i].Ypos <= zombArray[k].Ypos )
						{
							zombArray[k].Xpos = zombArray[k].Xpos + zombArray[k].speed;
							zombArray[k].Ypos = zombArray[k].Ypos - zombArray[k].speed;
						}
						*/
					}else{
						zombArray[i].text = "";
						zombArray[k].text = "";
					}
				}
			}

			zombArray[i].moveSprite(Pone.Xpos,Pone.Ypos);

		}
			

		//Health Bar
		healthBar(Pone.health);
		
		//Sync
		dbSync();
}

	return;
}

void healthBar(float playerNumHealth)
{
	//Health bar function
	dbBox(10,10,playerNumHealth,20,dbRGB(255,0,0),dbRGB(255,0,0),dbRGB(0,255,0),dbRGB(0,255,0));
	dbText(35,25,dbStr(playerNumHealth));
	dbText(10,25,"HP: ");
}

void loadImages()
{
	//load images
	dbLoadImage("images/playerbase.png",1);
	dbLoadImage("images/zombiebase.png",2);
	dbLoadImage("images/level1.png",3);
}

void loadSounds()
{
	//load images
	dbLoadSound("sounds/zombie groan 1.wav",1);
}
void setupGame()
{
	//GDK setup
	dbSyncOn   ( );
	dbSyncRate ( 60 );
	dbRandomize ( dbTimer ( ) );
	//dbHideMouse();
	dbSetDisplayMode(800,600,32);
	dbSetWindowSize(800,600);
	dbSetWindowTitle("ZOMBIE SHOOTER");
	//Draw Sprites First
	dbDrawSpritesFirst();
	//load the images
	loadImages();
	//load sounds
	loadSounds();
	//Background Image
	dbSprite(2,0,0,3);

	//Drawn first
	//dbSetSpritePriority(2,0);
	

}

Zombie.cpp

#include "Zombie.h"
#include "DarkGDK.h"

Zombie::Zombie(void)
{
	//Constructor. Instantiate all base numbers here like health
	//Finding free sprite number
	int i = 1;
	do
	{
		i++;
	}while(dbSpriteExist(i));
	//A way around just using 2 for zombie image?
	spriteNum = i;
	zombieImage = 2;
	dbSprite (spriteNum, 500, 500, 2);
	dbOffsetSprite(spriteNum,dbSpriteWidth(spriteNum)/2,dbSpriteHeight(spriteNum)/2);
	health = 100;
	angle = (rand() % 360 + 1); 
	speed = (float)rand()/(float)RAND_MAX;
	dbRotateSprite(spriteNum, angle);
	dbSprite(spriteNum, Xpos, Ypos, zombieImage);
}

Zombie::~Zombie(void)
{
}

void Zombie::moveSprite(float playerx, float playery)
{
	//Moves the zombies relative to player location
	angle = dbAtanFull(dbSpriteX(spriteNum)-dbSpriteX(1),dbSpriteY(1)-dbSpriteY(spriteNum))-90;
	dbRotateSprite(spriteNum, angle + 180);
	
	if( playerx >= Xpos && playery >= Ypos )
	{
		Xpos = Xpos + speed;
		Ypos = Ypos + speed;
	}else if( playerx <= Xpos && playery <= Ypos )
	{
		Xpos = Xpos - speed;
		Ypos = Ypos - speed;
	}else if ( playerx <= Xpos && playery >= Ypos ) 
	{
		Xpos = Xpos - speed;
		Ypos = Ypos + speed;
	}else if ( playerx >= Xpos && playery <= Ypos )
	{
		Xpos = Xpos + speed;
		Ypos = Ypos - speed;
	}

dbSprite(spriteNum, Xpos, Ypos, zombieImage);
	//Print text above sprite
	dbText(Xpos,Ypos,text);
}

void Zombie::moan()
{
	if(!dbSoundPlaying(1))
	{
		dbPlaySound(1,0);
	}
}

// This function decides on what object the zombie should be moving to.
int Zombie::decideObjective()
{

return 1;
}

+ Code Snippet

#include "Zombie.h"
#include "DarkGDK.h"

Zombie::Zombie(void)
{
	//Constructor. Instantiate all base numbers here like health
	//Finding free sprite number
	int i = 1;
	do
	{
		i++;
	}while(dbSpriteExist(i));
	//A way around just using 2 for zombie image?
	spriteNum = i;
	zombieImage = 2;
	dbSprite (spriteNum, 500, 500, 2);
	dbOffsetSprite(spriteNum,dbSpriteWidth(spriteNum)/2,dbSpriteHeight(spriteNum)/2);
	health = 100;
	angle = (rand() % 360 + 1); 
	speed = (float)rand()/(float)RAND_MAX;
	dbRotateSprite(spriteNum, angle);
	dbSprite(spriteNum, Xpos, Ypos, zombieImage);
}


Zombie::~Zombie(void)
{
}

void Zombie::moveSprite(float playerx, float playery)
{
	//Moves the zombies relative to player location
	angle = dbAtanFull(dbSpriteX(spriteNum)-dbSpriteX(1),dbSpriteY(1)-dbSpriteY(spriteNum))-90;
	dbRotateSprite(spriteNum, angle + 180);
	
	if( playerx >= Xpos && playery >= Ypos )
	{
		Xpos = Xpos + speed;
		Ypos = Ypos + speed;
	}else if( playerx <= Xpos && playery <= Ypos )
	{
		Xpos = Xpos - speed;
		Ypos = Ypos - speed;
	}else if ( playerx <= Xpos && playery >= Ypos ) 
	{
		Xpos = Xpos - speed;
		Ypos = Ypos + speed;
	}else if ( playerx >= Xpos && playery <= Ypos )
	{
		Xpos = Xpos + speed;
		Ypos = Ypos - speed;
	}

	dbSprite(spriteNum, Xpos, Ypos, zombieImage);
	//Print text above sprite
	dbText(Xpos,Ypos,text);
}

void Zombie::moan()
{
	if(!dbSoundPlaying(1))
	{
		dbPlaySound(1,0);
	}
}


// This function decides on what object the zombie should be moving to.
int Zombie::decideObjective()
{

	return 1;
}

Player.cpp

#include "Player.h"
#include "DarkGDK.h"

Player::Player(int imageNum)
{
	//Constructor. Instantiate all base numbers here like health
	playerImage = imageNum;
	spriteNum = 1;
	dbSprite (1, 300, 250, imageNum);
	dbOffsetSprite(1,dbSpriteWidth(1)/2,dbSpriteHeight(1)/2);
	health = 200.0;
	defaultShootingDistance = 0;
	curLevel = 1;
	speed = 1.5;
}

Player::~Player(void)
{
}

void Player::moveSprite()
{
	//Movement for sprite
	
	if (dbScanCode() == 17)
	{
		//w
		Ypos -= speed;
	}

if (dbScanCode() == 31)
	{
		//s
		Ypos += speed;
	}

if (dbScanCode() == 30)
	{
		//a
		Xpos -= speed;
	}

if (dbScanCode() == 32)
	{
		//d
		Xpos += speed;
	}

if (dbKeyState(17) && dbKeyState(30))
	{
		//w and a
		Ypos -= speed/2;
		Xpos -= speed/2;
	}else if (dbKeyState(17) && dbKeyState(32))
	{
		//w and d
		Ypos -= speed/2;
		Xpos += speed/2;
	}else if (dbKeyState(31) && dbKeyState(30))
	{
		//s and a
		Ypos += speed/2;
		Xpos -= speed/2;
	}else if (dbKeyState(31) && dbKeyState(32))
	{
		//s and d
		Ypos += speed/2;
		Xpos += speed/2;
	}

angle = dbAtanFull(Ypos - dbMouseY(), Xpos - dbMouseX()); 
	dbRotateSprite(1, angle + 180);
	dbSprite(1, Xpos, Ypos, playerImage);
	//Player name
	dbText(Xpos - (dbTextWidth(name) / 2),Ypos - (dbSpriteHeight(spriteNum) - dbTextHeight(name)) , name);
}

+ Code Snippet


#include "Player.h"
#include "DarkGDK.h"

Player::Player(int imageNum)
{
	//Constructor. Instantiate all base numbers here like health
	playerImage = imageNum;
	spriteNum = 1;
	dbSprite (1, 300, 250, imageNum);
	dbOffsetSprite(1,dbSpriteWidth(1)/2,dbSpriteHeight(1)/2);
	health = 200.0;
	defaultShootingDistance = 0;
	curLevel = 1;
	speed = 1.5;
}

Player::~Player(void)
{
}


void Player::moveSprite()
{
	//Movement for sprite
	
	if (dbScanCode() == 17)
	{
		//w
		Ypos -= speed;
	}

	if (dbScanCode() == 31)
	{
		//s
		Ypos += speed;
	}

	if (dbScanCode() == 30)
	{
		//a
		Xpos -= speed;
	}

	if (dbScanCode() == 32)
	{
		//d
		Xpos += speed;
	}

	if (dbKeyState(17) && dbKeyState(30))
	{
		//w and a
		Ypos -= speed/2;
		Xpos -= speed/2;
	}else if (dbKeyState(17) && dbKeyState(32))
	{
		//w and d
		Ypos -= speed/2;
		Xpos += speed/2;
	}else if (dbKeyState(31) && dbKeyState(30))
	{
		//s and a
		Ypos += speed/2;
		Xpos -= speed/2;
	}else if (dbKeyState(31) && dbKeyState(32))
	{
		//s and d
		Ypos += speed/2;
		Xpos += speed/2;
	}

	angle = dbAtanFull(Ypos - dbMouseY(), Xpos - dbMouseX()); 
	dbRotateSprite(1, angle + 180);
	dbSprite(1, Xpos, Ypos, playerImage);
	//Player name
	dbText(Xpos - (dbTextWidth(name) / 2),Ypos - (dbSpriteHeight(spriteNum) - dbTextHeight(name)) , name);
}

Any help is appreciated.

Image of what I'm talking about.http://i51.tinypic.com/n6s3dk.jpg Those sprites are touching, but only one of them has the text above them.

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Dashiznitz

13

Years of Service

User Offline

Joined: 25th May 2011

Location:

Posted: 17th Jun 2011 20:48

Link

It looks like the second assignment where:
for(int k = 0; k <= ZOMBIE_AMOUNT - 1; k++)
{
if (dbSpriteCollision(zombArray[k].spriteNum, zombArray[i].spriteNum))
{
if( zombArray[k].spriteNum != zombArray[i].spriteNum )
{
zombArray[i].text = "HIT";
->>>> zombArray[k].text = "HIT";

is getting overwritten because get to a point where the statement above is initially then later in the loop is true again and overwrites the value. you should start k = i+1 so you never compare the same element.

One question, for your player and zombie classes, are the Xpos, Ypos, health public members?

I like how you used the loop for creating multiple zombie objects for the array side. I was contemplating on how I was going to do this as well. I have a similar project dragon slayer. So far I have the player and one dragon that bounces around the walls of the screen. I have a function also where the player faces the mouse but i used the dbAtan not ATanfull... was a pain to get the angle right for all quadrants using a long if-else, where you did it in two lines.

-Trying to get better

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Dark GDK / Zombie Sprite Collision Help