[MahovIV]

Объясните, пожалуйста, что делает эта программа? Пожалйста, в комментариях.

Код:

#include <graphics.h>  // initgraph(), ...
#include <conio.h>     // getch(), kbhit(), gotoxy()
#include <stdio.h>     // printf()
#include <dos.h>       // intr()
#include <D:\BC31\mousedsg.dat>

unsigned NewCurs[32];
int HotPointX,HotPointY;

void main()
{

  for( int i=0; i<16; i++ )
  { NewCurs[i] = (~MouseDsgn1[i]);
    NewCurs[i+16]= MouseDsgn1[i];
  }
  HotPointX=(char)(MouseDsgn1[16]>>8);
  HotPointY=(char) MouseDsgn1[16];

  struct REGPACK reg;
  reg.r_ax=0; intr(0x33,&reg); 
  if (reg.r_ax == 0)           
     { printf("............! Press any key to exit...");
       getch(); return; }
  else
     { printf("............ %d .... ....!", reg.r_bx);
       getch(); }

  int gdriver = DETECT, gmode, errorcode;
  initgraph(&gdriver,&gmode,"G:\\PROGRAMS\\BC31\\BGI");
  if((errorcode = graphresult()) != grOk)
  {
      printf("Graphics error: %s\n", grapherrormsg(errorcode));
      printf("Press any key to exit..."); getch(); return;
  }

  reg.r_bx=HotPointX;
  reg.r_cx=HotPointY;
  reg.r_es=FP_SEG(&NewCurs);
  reg.r_dx=FP_OFF(&NewCurs);
  reg.r_ax=9; intr(0x33,&reg);

  reg.r_ax=1; intr(0x33,&reg);    //.... 

  int Xp = -1,Yp = -1;
  while (!kbhit())                //...
  {  reg.r_ax=3; intr(0x33,&reg); //...

     gotoxy(1,1);
     printf("x =%3d  y =%3d", reg.r_cx, reg.r_dx); //...

     if (reg.r_bx == 0) //
     {   printf("                                  ");
     }
     else if( reg.r_bx == 1 )
     {
          printf("   ... .... ... .......         ");
          setcolor(RED);
          reg.r_ax=2; intr(0x33,&reg); // . . .
          line(Xp, Yp, reg.r_cx, reg.r_dx);
          reg.r_ax=1;  intr(0x33,&reg);   // ...
     }
     else if( reg.r_bx == 2 )
     {
          printf("  .... .... .... ....        ");
          setcolor(GREEN);
          circle(reg.r_cx,reg.r_dx,3);
     }
     else if( reg.r_bx == 3 )
     {
          printf("  ..... .... .... .... ....    ");
          reg.r_ax=2; intr(0x33,&reg);   // ...
                                    ;   // ...
          reg.r_ax=1; intr(0x33,&reg);   // ...
     }
     else printf("   UnKnown buttons combination...%d  ",reg.r_bx);

     Xp = reg.r_cx;
     Yp = reg.r_dx;
  }//while
  closegraph();
}

Эту программу тоже.

Код:

#include <graphics.h>  // initgraph(), ...
#include <conio.h>     // getch(), kbhit(), gotoxy()
#include <stdio.h>     // printf()
#include <dos.h>       // intr()
#include <bios.h>      // bioskey()

#define KB_ESC        0x011B
#define KB_ENTER      0x1C0D
#define KB_HOME       0x4700
#define KB_END        0x4F00
#define KB_BS         0x0E08
#define KB_TAB        0x0F09
#define KB_PLUS       0x4E2B
#define KB_MINUS      0x4A2D
#define KB_UPARROW    0x4800
#define KB_LEFTARROW  0x4B00
#define KB_RIGHTARROW 0x4D00
#define KB_DOWNARROW  0x5000

void main()
{
  struct REGPACK reg;
  int gdriver = DETECT, gmode, errorcode;
  initgraph(&gdriver, &gmode, "G:\\PROGRAMS\\BC31\\BGI");

  reg.r_ax=0; intr(0x33,&reg); 
  if (reg.r_ax == 0)           
     { printf("............! Press any key to exit...");
       getch(); return; }
  else
     { printf("............ %d .... ....!", reg.r_bx);
       getch(); }

  int FontSize=1;
  while( 1 ) 
  {  
     int CharWidth =textwidth ("_"); // ...
     int CharHeight=textheight("│"); // ...

     reg.r_ax=3; intr(0x33,&reg);

     if( bioskey(1) ) 
     {
     int key = bioskey(0);

     if( key == KB_ESC ){ break;     }
     else if(key == KB_LEFTARROW )
          {  reg.r_cx-=CharWidth;
                reg.r_ax=4; intr(0x33,&reg);}
     else if(key == KB_RIGHTARROW)
          {  reg.r_cx+=CharWidth;
                reg.r_ax=4; intr(0x33,&reg);}
     else if(key == KB_UPARROW)
          {  reg.r_dx-=CharHeight; 
                reg.r_ax=4; intr(0x33,&reg);}
     else if(key == KB_DOWNARROW)
          {  reg.r_dx+=CharHeight; 
                reg.r_ax=4; intr(0x33,&reg);}
     else if(key == KB_HOME)
          {  reg.r_cx = reg.r_dx = 0;
                reg.r_ax=4; intr(0x33,&reg);}
     else if(key == KB_END)
          { reg.r_cx = getmaxx() -CharWidth;
         reg.r_dx = getmaxy() -CharHeight;
         reg.r_ax =4; intr(0x33,&reg);  }
     else if(key == KB_ENTER)
          { reg.r_cx = 0;    reg.r_dx+=CharHeight;
         reg.r_ax =4; intr(0x33,&reg);}
     else if(key == KB_PLUS)
          {  if(FontSize<3) 
                   settextstyle(0,HORIZ_DIR,++FontSize);}
     else if(key == KB_MINUS)
          {  if(FontSize>0) 
                    settextstyle(0,HORIZ_DIR,--FontSize);}
     else {
         reg.r_ax=2; intr(0x33,&reg); 
         char* s = "*"; s[0]=(char)key; outtextxy(Xp, Yp, s);
         reg.r_cx += CharWidth; 
         reg.r_ax=4; intr(0x33,&reg);
         reg.r_ax=1; intr(0x33,&reg);   // ...
          }
     } //if(bioskey(1))
  } //while
  closegraph();
}