5-2.c

本书是单片机系列教材

/*5-2.c*/
#include<graphics.h>
#include<stdlib.h>
#include<stdio.h>
#include<dos.h>
union REGS r;
void mouse(int x,int y)
{
line(x-5,y,x+5,y);
line(x,y-5,x,y+5);
}
void read(int *x,int *y,int *mbutt,int *oldx,int *oldy)
{
 *oldx=*x;
 *oldy=*y;
 do
 {r.x.ax=3;
  int86(51,&r,&r);       /*产生鼠标中断*/
  *x=r.x.cx;             /*光标当前X坐标*/
  *y=r.x.dx;              /*光标当前Y坐标*/
  *mbutt=r.x.bx;         /*按键状态*/
	}while(*x==*oldx&&*y==*oldy&&*mbutt==0);
}
main()
{
char *strx,*stry;
int mx,my,ox,oy;
int butt;
int gd=DETECT,gm;
  initgraph(&gd,&gm,"c:\\bc\\bin\\bgi");
setwritemode(XOR_PUT);
 r.x.ax=3;
 int86(51,&r,&r);
 mx=r.x.dx;
 my=r.x.cx;
 butt=r.x.bx;
 mouse(mx,my);
 setfillstyle(1,BLACK);
 for(;;)
 {
 bar(5,5,100,25);
  sprintf(strx,"%d",mx);
	sprintf(stry,"%d",my);
outtextxy(10,10,strx);
outtextxy(60,10,stry);
delay(20);
  read(&mx,&my,&butt,&ox,&oy);
  mouse(ox,oy);
  mouse(mx,my);
 if(butt==1)
  exit(0);
}
}