C#中DrawCurve的用法小结

using System;
using System.Drawing;
using System.Windows.Forms;

public class MainForm : Form
{
    private void DrawCurveExample(PaintEventArgs e)
    {
        // 创建 Graphics 对象
        Graphics g = e.Graphics;

        // 定义一个 Pen 对象
        Pen myPen = new Pen(Color.Blue, 2);

        // 定义一系列的 Point 结构
        Point[] points =
        {
            new Point(50, 100),
            new Point(100, 200),
            new Point(200, 100),
            new Point(300, 200),
            new Point(400, 100)
        };

        // 使用 DrawCurve 方法绘制曲线
        g.DrawCurve(myPen, points);

        // 释放资源
        myPen.Dispose();
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);
        DrawCurveExample(e);
    }
}

using System;
using System.Drawing;
using System.Windows.Forms;

public class MainForm : Form
{
    public MainForm()
    {
        this.Paint += new PaintEventHandler(MainForm_Paint);
    }

    private void MainForm_Paint(object sender, PaintEventArgs e)
    {
        Graphics g = e.Graphics;
        Pen myPen = new Pen(Color.Blue, 2);

        // 定义一系列点
        Point[] points = new Point[]
        {
            new Point(50, 50),
            new Point(100, 200),
            new Point(200, 200),
            new Point(250, 50)
        };

        // 检查点的数量是否足够
        if (points.Length < 2)
        {
            MessageBox.Show("至少需要两个点来绘制曲线。");
            return;
        }

        // 设置曲线的张力（曲率），值通常在0到1之间
        float tension = 0.5f; // 可以调整此值来改变曲线的弯曲程度

        // 绘制曲线
        g.DrawCurve(myPen, tension, points);
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MainForm());
    }
}

public void DrawCurve(Pen pen, Point[] points);

if (points.Length < 2)
{
    throw new ArgumentException("At least two points are required to draw a curve.");
}

// 继续绘制曲线
g.DrawCurve(myPen, points);