阅读下列说明和C++代码,填写程序中的空(1)~(6),将解答写入答题纸的对应栏内。
【说明】
以下C++代码实现一个简单绘图工具,绘制不同形状以及不同颜色的图形。部分类及其关系如图6-1所示。
【C++代码】
#include <iostream>
#include <string>
using namespace std;
class DrawCircle {//绘制圆形,抽象类
public:
(1);//定义参数为 int radius, int x, int y
virtual~DrawCircle() { }
};
class RedCircle:public DrawCircle { //绘制红色圆形
public:
void drawCircle(int radius, int x, int y) {
cout << "Drawing Circle[red,radius: " <<radius;
cout << ",x: " <<x<< ",y: "<<y<< "]" << end1;
}
};
class GreenCircle:public DrawCircle {//绘制绿色圆形
public:
void drawCircle(int radius, int x, int y) {
cout <<"Drawing Circle[green,radius: " << radius;
cout <<",x: " <<x<< ",y: " <<y<< "]" << end1;
}
};
class Shape {//形状,抽象类
protected:
(2) ;
public:
Shape(DrawCircle *drawCircle) {
this -> drawCircle = drawCircle;
}
virtual~shape() { }
public:
virtual void draw() = 0;
};
class Circle:public Shape {//圆形
private:
int x,y,radius;
public:
Circle(int x,int y,int radius,DrawCircle *drawCircle)(3) {
this->x = x;
this->y = y;
this->radius = radius;
}
public:
void draw() {
drawCircle -> (4);
}
};
int main()
{
Shape *redCircle=new Circle(100,100,10, (5));//绘制红色圆形
Shape *greenCircle=new Circle(100,100,10, (6));//绘制绿色圆形
redCircle ->draw();
greenCircle ->draw();
return 0;
}