shapes.h.svn-base

来自「QT方面的开发」· SVN-BASE 代码 · 共 51 行

#ifndef SHAPES_H
#define SHAPES_H

#include <QString>
//start id=shape
class Shape {  /* an abstract base class. */
 public:
    virtual double area() = 0;    /* pure virtual function */
    virtual QString getName() = 0;
    virtual QString getDimensions() = 0;
	virtual ~Shape() {}
};
//end
//start id=derived
class Rectangle : public Shape {
 public:
    Rectangle(double h, double w) :
        m_Height(h), m_Width(w) {}
    double area();
    QString getName();
    QString getDimensions();

 protected: /* We want to access m_Height in Square class */
    double m_Height, m_Width;
};

class Square : public Rectangle {
 public:
    Square(double h) : Rectangle(h,h) {} /* Base class
                                            name in member initialization list - pass arguments
                                            to base class ctor */
    double area();
    QString getName();    
    QString getDimensions();
};

//end

class Circle : public Shape {
 public:
    Circle(double r) : m_Radius(r) {}
    double area();
    QString getName();
    QString getDimensions();
 private:
    double m_Radius;
};

#endif        //  #ifndef SHAPES_H