.trapezoid-button { width: 120px; height: 40px; background-color: #4CAF50; color: white; text-align: center; line-height: 40px; transform: perspective(50px) rotateX(20deg); }怎么逆时针旋转90°

要将该按钮逆时针旋转90度，可以将transform属性中的rotateX(20deg)改为rotateY(-90deg)，同时将width和height属性交换。以下是修改后的代码：

.trapezoid-button {
  width: 40px;
  height: 120px;
  background-color: #4CAF50;
  color: white;
  text-align: center;
  line-height: 120px;
  transform: perspective(50px) rotateY(-90deg);
}

这样就可以实现逆时针旋转90度的等腰梯形按键了。需要注意的是，由于按钮的宽度和高度已经交换，因此需要相应地调整按钮的文本对齐方式和行高。

相关问题

#include<iostream> using namespace std; class Shape { public: virtual double area() const=0; }; class Circle:public Shape { public: Circle(double r):radius(r) { } virtual double area() const { return 3.14159*radius*radius; } protected: double radius; }; class Square:public Shape { public: Square(double s):side(s) { } virtual double area() const { return side*side; } protected: double side; }; class Rectangle:public Shape { public: Rectangle(double w,double h):width(w),height(h) { } virtual double area() const { return width*height; } protected: double width,height; }; class Trapezoid:public Shape { public: Trapezoid(double t,double b,double h):top(t),bottom(b),height(h) { } virtual double area() const { return 0.5*(top+bottom)*height; } protected: double top,bottom,height; }; class Triangle:public Shape { public: Triangle(double w,double h):width(w),height(h) { } virtual double area() const { return 0.5*width*height; } protected: double width,height; }; int main() { Circle circle(12.6); Square square(3.5); Rectangle rectangle(4.5,8.4); Trapezoid trapezoid(2.0,4.5,3.2); Triangle triangle(4.5,8.4); Shape *pt[5]= { &circle,&square,&rectangle,&trapezoid,&triangle }; double areas=0.0; for(int i=0; i<5; i++) { areas=areas+pt[i]->area(); } cout<<"total of all areas="<<areas<<endl; return 0; }这段代码若要输出Circle:498.51 Square:12.25 Rectangle:37.80 Trapezoid:10.40 Triangle:18.90，如何改进

可以将输出语句放在循环中，分别输出每个图形的面积。可以在每个 Shape 类的子类中添加一个成员函数，用于返回该图形的名称，然后在输出语句中使用该函数获取图形名称。代码如下：

#include<iostream>
using namespace std;

class Shape {
public:
    virtual double area() const = 0;
    virtual string name() const = 0; // 添加获取图形名称的函数
};

class Circle : public Shape {
public:
    Circle(double r) : radius(r) {}
    virtual double area() const {
        return 3.14159 * radius * radius;
    }
    virtual string name() const { // 返回图形名称
        return "Circle";
    }
protected:
    double radius;
};

class Square : public Shape {
public:
    Square(double s) : side(s) {}
    virtual double area() const {
        return side * side;
    }
    virtual string name() const {
        return "Square";
    }
protected:
    double side;
};

class Rectangle : public Shape {
public:
    Rectangle(double w, double h) : width(w), height(h) {}
    virtual double area() const {
        return width * height;
    }
    virtual string name() const {
        return "Rectangle";
    }
protected:
    double width, height;
};

class Trapezoid : public Shape {
public:
    Trapezoid(double t, double b, double h) : top(t), bottom(b), height(h) {}
    virtual double area() const {
        return 0.5 * (top + bottom) * height;
    }
    virtual string name() const {
        return "Trapezoid";
    }
protected:
    double top, bottom, height;
};

class Triangle : public Shape {
public:
    Triangle(double w, double h) : width(w), height(h) {}
    virtual double area() const {
        return 0.5 * width * height;
    }
    virtual string name() const {
        return "Triangle";
    }
protected:
    double width, height;
};

int main() {
    Circle circle(12.6);
    Square square(3.5);
    Rectangle rectangle(4.5, 8.4);
    Trapezoid trapezoid(2.0, 4.5, 3.2);
    Triangle triangle(4.5, 8.4);
    Shape* pt[] = { &circle,&square,&rectangle,&trapezoid,&triangle };
    double areas = 0.0;
    for (int i = 0; i < 5; i++) {
        cout << pt[i]->name() << ":" << pt[i]->area() << " "; // 输出图形名称和面积
        areas += pt[i]->area();
    }
    cout << endl << "total of all areas=" << areas << endl;
    return 0;
}

In a graph system, there is an abstract class Figure, from which five derived classes are derived: Circle, Square, Rectangle, Trapezoid and Triangle. For example, Square has edge length, Rectangle may have length and width data members, Circle may have radius. Trapezoid may have upper bottom, lower bottom, and high data members. In a well-designed system, these classes are derived from a common class Figure. In this system, the Area() function is defined as a virtual function, and the area of these figures is calculated respectively, and the sum of their areas is calculated. In the main function: 1) Use the base class Figure to define an array, and each element is an object (instance) of five derived classes; 2) Output the area of each derived class object; 3) Output the sum of their area; 4) In addition to realizing the above functions, the main function should also include the following files: #include <iostream> #include "Figure.h" #include "Rectangle.h" #include "Trapezoid.h“ #include "Triangle.h" #include "Square.h " #include " Circle.h " using namespace std; int main() { ……; return 0; }

Here is an example implementation of the system you described:

#include <iostream>
#include "Figure.h"
#include "Rectangle.h"
#include "Trapezoid.h"
#include "Triangle.h"
#include "Square.h"
#include "Circle.h"

using namespace std;

int main()
{
    // Define an array of Figure objects, including objects of derived classes
    Figure* figures[5];
    figures[0] = new Circle(5);
    figures[1] = new Square(4);
    figures[2] = new Rectangle(3, 5);
    figures[3] = new Trapezoid(2, 5, 4);
    figures[4] = new Triangle(4, 6);

    // Output the area of each object
    for (int i = 0; i < 5; i++)
    {
        cout << "Area of figure " << (i+1) << ": " << figures[i]->Area() << endl;
    }

    // Calculate the sum of their areas
    double totalArea = 0;
    for (int i = 0; i < 5; i++)
    {
        totalArea += figures[i]->Area();
    }
    cout << "Total area: " << totalArea << endl;

    // Clean up memory
    for (int i = 0; i < 5; i++)
    {
        delete figures[i];
    }

    return 0;
}

In this implementation, we create an array of Figure pointers, and initialize each element with a new instance of a derived class. We then loop through the array, calling the Area() function on each object and outputting the result. Finally, we loop through the array again to calculate the total area by summing up the individual areas. We also clean up the memory allocated for the objects before exiting the program.