#include <iostream>
#include<graphics.h>
#include<math.h>

using namespace std;
int distance(int x1,int y1,int x2,int y2)
{
    return sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));

}
float angle(int x1 , int y1, int x2 , int y2)
{
    float ang;
    if(x1-x2==0)
    {
        ang=-1.57;
    }
    else
    {
        ang = atan((float)(y1 - y2) / (x1 - x2));
    }
    if (ang < 0 && y1> y2)
    {
        ang += 3.14;
        //cout<<"C";
    }
    else if (ang > 0 && x1 < x2)
    {
        // cout<<"A";
        ang += 3.14;
    }
    return ang;
}


int main()
{

    float x1=200,y1=200,x2=200,y2=200, s=100;
    float vx2=0,vy2=0;


    //int gd = DETECT, gm;
    //int x = 320, y = 240, radius;
    //cout<<&gd;
    initwindow (550, 400,"Windows BGI",50,50, false,true);

    while(1)
    {

        x1=mousex();
        y1=mousey();

        int d1=distance(x1,y1,x2,y2);
        float ang1=angle(x1,y1,x2,y2);
        if(d1-s>0)
        {
            vy2+=(d1-s)*sin(ang1)*.007;
            vx2+=(d1-s)*cos(ang1)*.007;

        }

        //  cout<<ang1*180/3.14<<endl;
        vy2+=.23;

        y2+=vy2;
        x2+=vx2;

        vy2*=.99;
        vx2*=.99;

        circle(x1,y1,25);
        circle(x2,y2,25);
        line (x1,y1,x2,y2);
        delay(40);
        swapbuffers();
        cleardevice();
    }
    getch();
    return 0;
}