C/C++ Source Codes

star simmulation

#include<dos.h>
#include<conio.h>
#include<stdlib.h>
#include<stdio.h>
#include"apvector.h"

#define LEFT 75
#define RIGHT 77

typedef unsigned char byte;

void set_mode(byte mode)
{
union REGS regs;
regs.h.ah = 0x00;
regs.h.al = mode;
int86(0x10, &regs, &regs);
}

void pixel(int x,int y,byte color)
{
union REGS regs;
regs.h.ah = 0x0C;
regs.h.al = color;
regs.x.cx = x;
regs.x.dx = y;
int86(0x10, &regs, &regs);
}

void opening(void)
{
clrscr();
_setcursortype(_NOCURSOR);
gotoxy(30,1); cout<<"Starfield Simulation";
gotoxy(37,2); cout<<"by Sean Bugel";
gotoxy(2,19); cout<<"+ to speed up star field";
gotoxy(2,20); cout<<"- to slow down star field";
gotoxy(2,21); printf("%c to move the star field right",16);
gotoxy(2,22); printf("%c to move the star field left",17);
gotoxy(2,23); cout<<"'Esc' to quit simulation";

while(!kbhit())
{
gotoxy(1,25);
clreol();
delay(750);
gotoxy(28,25);
cout<<"Press any key to continue...";
delay(1000);
}
clrscr();
}

void main(void)
{
opening();

set_mode(0x13);
randomize();
apvector<int>x(31); //array of x axis for 30 stars
apvector<int>y(31); //array of y axis for 30 stars

int i=8,finish=0,a=0,b=0,inc=2,c,dir=0; //i is star speed, finish is variable for exit from loop
//a & b used for finding random star position loop
//inc slows down second and third field
//dir is variable to choose direction of starfield, 0 left, 1 right

while(a!=30) //allocate 30 x positions
{
x[a]=rand()%320;
a++;
}

while(b!=30) //allocate 30 y positions
{
y[b]=rand()%320;
b++;
}

c=1;
while(c!=10) //place 10 WHITE stars
{
pixel(x[c],y[c],WHITE);
c++;
}

while(!finish)
{
if(kbhit())
{
switch(getch()) //This code is for controlling the speed
{
case 61: //+
{
if(i>=2){i--;}
else break;
} break;
case 43: //+
{
if(i>=2){i--;}
else break;
} break;

case 95: //-
{
if(i<=16){i++;}
else break;
} break;
case 45: //-
{
if(i<=16){i++;}
else break;
} break;

case LEFT:
{
dir=0;
} break;
case RIGHT:
{
dir=1;
} break;

case 27: //Quit
{
finish=1;
} break;

default: break;
}
}

inc++; //variable used to slow down second and third field

c=1;
while(c<=10) //erase first field
{
pixel(x[c],y[c],BLACK);
c++;
}

c=1;
while(c<=10) //checks to see if field 1 stars hit border
{

if(dir==0) //if direction is left
{
if(x[c]!=1){x[c]--;} else{y[c]=rand()%200;x[c]=320;}
}

else if(dir=1) //if direction is right
{
if(x[c]!=320){x[c]++;} else{y[c]=rand()%200;x[c]=1;}
}
c++;
}

if(inc%2==0) //second star field algos
{
c=11;
while(c<=20) //erase second field
{
pixel(x[c],y[c],BLACK);
c++;
}

c=11;
while(c<=20) //checks to see if field 2 stars hit border
{
if(dir==0) //if direction is left
{
if(x[c]!=1){x[c]--;} else{y[c]=rand()%200;x[c]=320;}
}

else if(dir=1) //if direction is right
{
if(x[c]!=320){x[c]++;} else{y[c]=rand()%200;x[c]=1;}
}
c++;
}

c=11;
while(c<=20) //place 10 LIGHTGRAY stars
{
pixel(x[c],y[c],LIGHTGRAY);
c++;
}
} //end of second star field data

if( inc%5==0) //third star field algos
{
c=21;
while(c<=30) //erase third field
{
pixel(x[c],y[c],BLACK);
c++;
}

c=21;
while(c<=30) //checks to see if field 3 stars hit border
{
if(dir==0) //if direction is left
{
if(x[c]!=1){x[c]--;} else{y[c]=rand()%200;x[c]=320;}
}

else if(dir=1) //if direction is right
{
if(x[c]!=320){x[c]++;} else{y[c]=rand()%200;x[c]=1;}
}
c++;
}

c=21;
while(c<=30) //place 10 dark gray stars
{
pixel(x[c],y[c],DARKGRAY);
c++;
}
} //end of third star field data

c=1;
while(c<=10) //place 10 white stars
{
pixel(x[c],y[c],WHITE);
c++;
}

delay(i);
if(inc==500){inc=2;} //to keep the variable from getting too big
}

set_mode(0x03);
_setcursortype(_NORMALCURSOR);
}

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