zhui.cpp

用c写的导弹打飞机

#include "graphics.h"
#include "stdio.h"
#include "math.h"
#include "conio.h"
#include "dos.h"
const PI=3.1415926;
double l=25.;
void main(void)
{
  float V;
  printf("the problem of tracing,\n\n");
  printf("copyright(R) by CeKong 0102 ShiShiQiang.\n\n ");
  printf("SSQ:  please input the speed of the missle:\n\n");
  printf("It should be between 0 and 50\n\n");
  printf("the speed of the missle is:");
  scanf("%f",&V);
  int gdriver=DETECT,gmode;
  initgraph(&gdriver,&gmode,"");
  int i=0;
  float x,y,X=0.0,Y=0.0,DX,DY,v=V/10.0;
  float k,DD,px,py,PX,PY;
  setbkcolor(0);                                    /*                    */
  settextstyle(1,0,2);                              /*                    */
  setcolor(11);                                     /*                    */
  outtextxy(100,10,"press any key to go......");    /*notice:             */
  getch();                                          /*     V=14,          */
  setfillstyle(1,0);                                /*     just get       */
  bar(100,10,500,60);                               /*       target       */
  outtextxy(100,10,"it is now running after....");  /*                    */
  do
  {
	setcolor(14);
	circle(X,Y,10);
	x=i;
	y=100*sin(0.5*i*PI/180.0)+100.0;
	setcolor(2);
	circle(x,y,10);
	float t=(x-X)*(x-X)+(y-Y)*(y-Y);
	DD=sqrt(t);     /*      distance of the two circles     */
	if(Y!=y)        /*   if the two circles Y is the same   */
	{
	  k=(X-x)/(Y-y);
	  DX=(v*k)/sqrt(1+k*k);
	  DY=v/sqrt(1+k*k);
	}
	else
	{DX=0;DY=v;}
	X=DX+X;
	Y=DY+Y;
	setcolor(14);
	circle(X,Y,10);
	if(i>=1)
	{
		setcolor(0);
		circle(px,py,10);
		circle(PX,PY,10);
	}                         /* to erase the previous circles    */
	px=x;py=y;PX=X;PY=Y;
	i++;
	if(V<=13) /*  the speed of the missle is too small      */
	{         /*  to get the target                         */
		if(i==400)
		{
			settextstyle(1,0,3);
			setcolor(6);
			outtextxy(317,297,"target lost...");
			goto end;
		}

	}

	delay(20);

  }while(DD>l);
  settextstyle(0,0,5);
  setcolor(4);
  outtextxy(x+10,y+10,"got it!");
end:

  bar(100,10,500,60);
  settextstyle(1,0,2);
  setcolor(11);
  outtextxy(100,10,"press any key to leave.....");
  getch();
  closegraph();
  }