C++设计一个折线类 CLine 1、该类有属性： 组成线的点数、点坐标数组（动态或静态）、线的颜色（整数）、线的宽度（整数）； 2、该类有方法： a) 设置和获取颜色 两个方法 b) 设置和获取线宽 两个方法 c) 添加一个点到线上 b) 在线上删除一个点 e) 修改一个线上点的坐标 f) 获取线上的点数 g) 获取一个线上点的坐标

以下为C++代码示例：

#include <iostream>
#include <vector>
using namespace std;

class CLine {
private:
    int pointNum; // 点的数量
    vector<pair<int, int>> points; // 点坐标数组
    int color; // 线的颜色
    int lineWidth; // 线的宽度

public:
    // 构造函数
    CLine() : pointNum(0), color(0), lineWidth(0) {}

    // 设置和获取颜色
    void setColor(int c) { color = c; }
    int getColor() const { return color; }

    // 设置和获取线宽
    void setLineWidth(int w) { lineWidth = w; }
    int getLineWidth() const { return lineWidth; }

    // 添加一个点到线上
    void addPoint(int x, int y) {
        points.push_back(make_pair(x, y));
        pointNum++;
    }

    // 在线上删除一个点
    void deletePoint(int index) {
        if (index < 0 || index >= pointNum) return;
        points.erase(points.begin() + index);
        pointNum--;
    }

    // 修改一个线上点的坐标
    void modifyPoint(int index, int x, int y) {
        if (index < 0 || index >= pointNum) return;
        points[index] = make_pair(x, y);
    }

    // 获取线上的点数
    int getPointNum() const { return pointNum; }

    // 获取一个线上点的坐标
    pair<int, int> getPoint(int index) const {
        if (index < 0 || index >= pointNum) return make_pair(0, 0);
        return points[index];
    }
};

使用示例：

int main() {
    CLine line1;
    line1.setColor(1);
    line1.setLineWidth(2);
    line1.addPoint(0, 0);
    line1.addPoint(1, 1);
    line1.addPoint(2, 3);
    line1.addPoint(4, 2);

    cout << "Line1 color: " << line1.getColor() << endl;
    cout << "Line1 width: " << line1.getLineWidth() << endl;
    cout << "Line1 point num: " << line1.getPointNum() << endl;

    for (int i = 0; i < line1.getPointNum(); i++) {
        pair<int, int> point = line1.getPoint(i);
        cout << "Point " << i << ": (" << point.first << ", " << point.second << ")" << endl;
    }

    line1.deletePoint(1);
    line1.modifyPoint(2, 5, 4);

    cout << "After delete and modify:" << endl;
    cout << "Line1 point num: " << line1.getPointNum() << endl;

    for (int i = 0; i < line1.getPointNum(); i++) {
        pair<int, int> point = line1.getPoint(i);
        cout << "Point " << i << ": (" << point.first << ", " << point.second << ")" << endl;
    }

    return 0;
}