Go4Expert - My Game: Egg Catcher

Introduction:

Hi and welcome to my article, this article is a small game using graphics in c++(DOS Based).I programmed this game and all of the graphics design is imagined by my friend Amit Mehta.

here is little description of game

"This is a simple game for new programmers. It will help them to get a clear view of 2D Graphics The output is a game where the player catches eggs droped by a egg thrower and goes on to various levels "
---- By my Friend Amit
Here i explain some of the class I created and some of my logic.

Here is main Class that move the egg catcher using keyboard

The Code

Code: CPP

class EggCatcher
{
    int strx,stry,endx,endy; //coordinate of the moving box
    void *buff;////for handlling the box image
    short bool;
    board *Board;
    
    void BackGround();
    void DrawCatcher(int,int);
public:
    char Player[10];
    
    EggCatcher(int,int,board&);
    void Start(int,int);
    void End();
    void CatcherMove(int);
    void PreScreen();
    void SayByeBye();
    ~EggCatcher()
    {free(buff);
    delete Board;
    }
};

This is little function that read the keyboard input, I found this function in Mr. Yashwant Kanetkar book "let us C"

Code: CPP

#define UP 72
#define DOWN 80
#define RIGHT 77
#define LEFT 75
#define ENTER 28
#define END 28
#define ESC 1

int getscan()
{ 
    REGS i,o;
    //while(!kbhit());
    i.h.ah=0;
    int86(22,&i,&o);
    return(o.h.ah);
};

This function will return current key state by return the ASCII value of it and using switch statement i can track the movement of direction keys and some special keys.

Like thisà

Code: CPP

switch(ch)
{
case RIGHT: Box.CatcherMove(ch);
    break;
case LEFT:Box.CatcherMove(ch);
    break;
case ESC:Box.SayByeBye();
    Thrower1.EndGameProperties();
    exit(0);
}

Now I have created special bitmap class of my own to display images

Here it Class (it is defined and declared in second.cpp)

Code: CPP

struct bitmap
{
    short bit[20][20];
};
class BITMAP
{
    void *character;
public:
    // BITMAP();
    void* DrawImage(bitmap &bit,int x,int y);
};
void* BITMAP::DrawImage(bitmap &bit,int x,int y)
{
    int i,j;
    for(j=y;j<y+20;j++)
    {
        for(i=x;i<x+20;i++)
        {
            putpixel(i,j,bit.bit[j-y][i-x]);
        }
    }
    int size=imagesize(x,y,x+20,y+20);
    character=malloc(size);
    getimage(x,y,x+20,y+20,character);
    putimage(x,y,character,XOR_PUT);
    return character;
};

here how to use it-à

first create a bitmap bits using thisà

Code: CPP

const short W=15;//white
const short Y=14;//yellow
const short S=10;
const short E=11;
bitmap Egg1=
                           {0,0,0,0,0,0,0,0,0,W,W,W,0,0,0,0,0,0,0,0,
                            0,0,0,0,0,0,0,0,W,W,W,W,W,0,0,0,0,0,0,0,
                            0,0,0,0,0,0,0,W,Y,Y,Y,Y,Y,W,0,0,0,0,0,0,
                            0,0,0,0,0,0,W,W,0,Y,Y,Y,Y,W,W,0,0,0,0,0,
                            0,0,0,0,0,W,W,0,Y,Y,Y,Y,Y,Y,W,W,0,0,0,0,
                            0,0,0,0,W,W,0,Y,Y,Y,Y,Y,Y,Y,Y,W,0,0,0,0,
                            0,0,0,0,W,Y,Y,Y,Y,Y,Y,Y,Y,Y,Y,W,0,0,0,0,
                            0,0,0,0,W,Y,Y,Y,Y,Y,Y,Y,Y,Y,Y,W,0,0,0,0,
                            0,0,0,0,W,Y,Y,Y,Y,Y,8,8,Y,Y,Y,W,0,0,0,0,
                            0,0,0,0,W,Y,Y,Y,Y,8,8,8,8,Y,Y,W,0,0,0,0,
                            0,0,0,0,W,Y,Y,Y,Y,8,8,8,8,Y,Y,W,0,0,0,0,
                            0,0,0,0,0,W,Y,Y,Y,8,8,8,8,Y,Y,W,0,0,0,0,
                            0,0,0,0,0,W,Y,Y,Y,Y,8,8,Y,Y,Y,W,0,0,0,0,
                            0,0,0,0,0,W,Y,Y,Y,Y,Y,Y,Y,Y,W,0,0,0,0,0,
                            0,0,0,0,0,0,W,Y,Y,Y,Y,Y,Y,W,0,0,0,0,0,0,
                            0,0,0,0,0,0,W,Y,Y,Y,Y,Y,W,0,0,0,0,0,0,0,
                            0,0,0,0,0,0,0,W,Y,Y,Y,W,0,0,0,0,0,0,0,0,
                            0,0,0,0,0,0,0,W,W,W,W,0,0,0,0,0,0,0,0,0,
                            0,0,0,0,0,0,0,0,W,W,0,0,0,0,0,0,0,0,0,0,
                            0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

now in any part of function

Code: CPP

void show
{
    BITMAP *bit;
    void * eggbuff=bit.DrawImage(egg,40,40);
    //and to show
    putimage(x,y,eggbuff,XOR_PUT);
}

and this will show up the image of bitmap

The Logic Behind It:-

I am just using random function to generate the egg and at any given time all the egg move downward on the board matrix that is defined in start and if at end it found the catcher the score is incremented by one or you lose the chance.

Let me explain it more, I have a board according to which graphics displayed on the screen if the board matrix element is 0 is doesn’t display anything, same case for egg and egg catcher

Logic behind moving of eggs->every time thrower want to drop egg he put egg value in top of matrix, since every 100 msec the matrix is reviewed and screen is redrawn the egg can be shown on the screen, now for moving action each time top row is copied in it lower row and soon that and last row is discarded this is the logic of moving multiple egg in screen.

Note--> due limitation of size i can't able to upload the Executable File.now you have to compile the same