QT计算圆与直线关系

circle.h:

#ifndef CIRCLE_H
#define CIRCLE_H
#include "line.h"
#include "circle.h"
#include<math.h>
class line;
class circle
{
public:
    circle(double xx,double yy,double rr);
    double getX();
    double getY();
    double getR();
    void judge(line &l,circle &c);
private:
    double x,y,r;
};
 
 
#endif // CIRCLE_H
 
 

line.h:

#ifndef LINE_H
#define LINE_H
#include "line.h"
#include "circle.h"
#include<math.h>
 
 
class line
{
public:
    line(double kk,double bb);
    double distant(circle &c);
private:
    double k;
    double b;
};
 
 
#endif // LINE_H
 
 

circle.cpp:

#include "line.h"
#include "circle.h"
#include<math.h>
#include<QDebug>
circle::circle(double xx,double yy,double rr)
    :x(xx),
      y(yy),
      r(rr)
{
 
 
}
double circle::getX()
{
    return x;
}
double circle:: getY()
{
    return y;
}
double circle::getR()
{
    return r;
}
void circle:: judge(line &l,circle &c)
{
    double d=l.distant(c);
    if(d>r)
        qDebug()<<"圆与直线不相交!"<<endl;
    else if(d==r)
        qDebug()<<"圆与直线相切!"<<endl;
    else
        qDebug()<<"圆与直线相交!"<<endl;
}
 
 

line .cpp:

#include "line.h"
#include "circle.h"
#include<math.h>
line::line(double kk,double bb)
{
  k=kk;
  b=bb;
}
 double line::distant(circle &c)
 {
       double x=c.getX();
       double y=c.getY();
       double a,f,d;
       a=k*x+b+y;
       f=k*k+1;
       d=sqrt(a/f);
       return d;
 }
 
 

main.cpp:

#include <QCoreApplication>
#include "line.h"
#include "circle.h"
#include<math.h>
#include<iostream>
using namespace std;
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
  circle c(0,0,1);
  line l(1,3);
  c.judge(l,c);
  cout<<"r="<<c.getR()<<endl;
  cout<<"d="<<l.distant(c)<<endl;
  return 0;
    return a.exec();
}
 
 

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转载自blog.csdn.net/lannister_awalys_pay/article/details/80423318

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