画时钟：An Interesting Clock_instantiate clock-优快云博客

本文链接：https://blog.youkuaiyun.com/woshipangxiaofeng/article/details/5373213

本文介绍了一个使用C#实现的基本图形旋转绘制应用。通过定时器不断更新画布上的图形角度，实现了图形的旋转效果。利用Matrix类进行坐标变换，使线段围绕指定点旋转。

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace rotation
{
    public partial class Form1 : Form
    {
        float f = 0;
        public Form1()
        {
            InitializeComponent();
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            timer1.Enabled = true;
            timer1.Interval = 1000;
            this.Refresh();
        }
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawEllipse(Pens.Red, 0, 0, 220, 220);
            GraphicsPath gp = new GraphicsPath();
            gp.AddLine(30, 30, 110, 110);

            Matrix matricx = new Matrix(1, 0, 0, 1, 1, 1);
            PointF rp = new PointF(110.0f, 110.0f);
           matricx.RotateAt(f, rp);
            gp.Transform(matricx);
            e.Graphics.DrawPath(Pens.Blue, gp);
            f = f + 6;
            if (f == 360)
                f = 0;
        }

}
}