参考文献：《winform制作的精美时钟》https://www.cnblogs.com/gdjlc/archive/2013/03/08/2950297.html
效果图：
程序比较简单，只是演示一个例子，主要还是参考以上文献的代码，只是把步骤写的详细些，仅供新手参考。
①新建C#Winform项目，添加用户控件
②向【用户控件】中添加自定义的一些行为代码（控制此控件的样式和行为）
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace DynamicClock
{
public partial class UserControl1 : UserControl
{
const int screenWidth = 200; //屏幕宽度
const int screenHeight = 200; //屏幕高度
public UserControl1()
{
InitializeComponent();
this.Width = screenWidth + 1;
this.Height = screenHeight + 1;
this.DoubleBuffered = true; //控件缓冲，避免闪烁
this.SetStyle(ControlStyles.ResizeRedraw, true);
}
private void clockTimer_Tick(object sender, EventArgs e)
{
Invalidate();
}
protected override void OnPaint(PaintEventArgs e)
{
DateTime dtNow = DateTime.Now;
string dayOfWeek = dtNow.ToString("dddd", new System.Globalization.CultureInfo("zh-cn"));//星期几
Brush brush = new SolidBrush(Color.Black); //填充图形
Pen pen = new Pen(Color.Black); //画笔
Font hourFont = new Font("Arial", 10, FontStyle.Bold);//时钟数字的字体
Font dateFont = new Font("Arial", 9); //日期的字体
int dialRadius = Math.Min(screenWidth, screenHeight) / 2; //圆的半径
Graphics g = e.Graphics;
g.SmoothingMode = SmoothingMode.HighQuality;
//默认坐标系统原点是左上角，现在把原点移到屏幕中心, 右下左上对应的轴：x,y,-x,-y
g.TranslateTransform(dialRadius, dialRadius);
//画时钟最外层的圆线(pen,x,y,width,height)
//圆的中心点坐标计算：(width/2+x,height/2+y),据此可得出要使圆在坐标原点(0,0)的x,y坐标值
g.DrawEllipse(pen, -screenWidth / 2, -dialRadius, screenWidth, screenHeight);
GraphicsState state = g.Save();
//画矩形、日期、星期几
int rectWidth = 70;
int rectHeight = 30;
g.DrawRectangle(pen, -rectWidth / 2, rectHeight, rectWidth, rectHeight);
g.DrawString(dtNow.ToString("yyyy-MM-dd"), dateFont, brush, -rectWidth / 2, rectHeight + 2);
g.DrawString(dayOfWeek.PadLeft(8, ' '), dateFont, brush, -rectWidth / 2, rectHeight + 15);
g.Restore(state);
// 画时钟的60个圆点
//Save(),Restore(state)配合使用，使得平移、缩放、旋转等操作只对它们作用域之间的代码有效，
//save开始到restore之间这绘画，就像有绘制了一个图层，restore之后将两个图层放到一起
state = g.Save();
for (int i = 0; i < 60; i++)
{
int w = i % 5 == 0 ? 5 : 3;
g.FillEllipse(brush, 0, -dialRadius, w, w);
//围绕指定点按照顺时针方向旋转角度360 / 60 = 6度
g.RotateTransform(6);
}
g.Restore(state);
//画时钟的12个数字，如果用上面RotateTransform方法则数字会倾斜、倒立，故不用
state = g.Save();
for (int i = 0; i < 12; i++)
{
//已知圆中心占坐标(x0,y0),半径r，角度a0,则圆上任一点坐标（x,y）计算：
//x = x0 + r * cos(ao * 3.14 /180)
//y = y0 + r * sin(ao * 3.14 /180)
Point point = new Point(-6, -6); //当为(0,0)时全部数字偏右下移，故手动调整
double dd = Math.PI / 180 * i * (360 / 12); //每次转360/12度
float x = point.X + (float)((dialRadius - 12) * Math.Cos(dd));
float y = point.Y + (float)((dialRadius - 12) * Math.Sin(dd));
//因为是从顺时钟3点钟开始画，所以索引i需要加上3
int j = i + 3;
if (j > 12)
j = j - 12;
g.DrawString(j.ToString(), hourFont, brush, x, y);
}
g.Restore(state);
// 画时钟的图形
state = g.Save();
g.RotateTransform((dtNow.Hour - 12 + dtNow.Minute / 60f) * 360f / 12f);
//时钟指针默认指向12点钟方向,分钟指针也一样
g.DrawPolygon(new Pen(brush), new Point[]
{
new Point(0, 20), new Point( 10, 0),
new Point(0, -60), new Point(-10, 0)
});
g.Restore(state);
// 画分钟的图形
state = g.Save();
g.RotateTransform((dtNow.Minute + dtNow.Second / 60f) * 360f / 60f);
g.DrawPolygon(new Pen(brush), new Point[]
{
new Point(0, 20), new Point( 6, 0),
new Point(0, -80), new Point(-6, 0)
});
g.Restore(state);
// 画秒钟的图形
state = g.Save();
g.RotateTransform(dtNow.Second * 360f / 60f);
g.FillRectangle(brush, -1, -dialRadius + 10, 2, dialRadius);
g.Restore(state);
}
private void UserControl1_Paint(object sender, PaintEventArgs e)
{
}
}
}
③在主Form程序中，拉一个Panel控件上去，在后台代码中写上代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace DynamicClock
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
UserControl1 clock = new UserControl1();
panel1.Controls.Add(clock);
}
}
}
这样就完成了静态时钟的显示效果，如本文第一张图。
④动态时钟
只需要每秒刷新Panel面板对时钟的渲染就可以
从【工具箱】找到Timer控件，拖入至主面板
设置此控件属性
给Timer控件添加Tick事件，单击已添加的Timer控件，切换至事件列表，双击【Tick】事件就可以。
private void timer1_Tick(object sender, EventArgs e)
{
panel1.Controls.Clear();
UserControl1 clock = new UserControl1();
panel1.Controls.Add(clock);
}
代码的意思是，先清除Panel的内容，然后重新绘制时钟就可以，所以其实不是真正的动态，而是每秒刷新时钟的绘制。
所有代码如下：
自定义控件代码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace DynamicClock
{
public partial class UserControl1 : UserControl
{
const int screenWidth = 200; //屏幕宽度
const int screenHeight = 200; //屏幕高度
public UserControl1()
{
InitializeComponent();
this.Width = screenWidth + 1;
this.Height = screenHeight + 1;
this.DoubleBuffered = true; //控件缓冲，避免闪烁
this.SetStyle(ControlStyles.ResizeRedraw, true);
}
private void clockTimer_Tick(object sender, EventArgs e)
{
Invalidate();
}
protected override void OnPaint(PaintEventArgs e)
{
DateTime dtNow = DateTime.Now;
string dayOfWeek = dtNow.ToString("dddd", new System.Globalization.CultureInfo("zh-cn"));//星期几
Brush brush = new SolidBrush(Color.Black); //填充图形
Pen pen = new Pen(Color.Black); //画笔
Font hourFont = new Font("Arial", 10, FontStyle.Bold);//时钟数字的字体
Font dateFont = new Font("Arial", 9); //日期的字体
int dialRadius = Math.Min(screenWidth, screenHeight) / 2; //圆的半径
Graphics g = e.Graphics;
g.SmoothingMode = SmoothingMode.HighQuality;
//默认坐标系统原点是左上角，现在把原点移到屏幕中心, 右下左上对应的轴：x,y,-x,-y
g.TranslateTransform(dialRadius, dialRadius);
//画时钟最外层的圆线(pen,x,y,width,height)
//圆的中心点坐标计算：(width/2+x,height/2+y),据此可得出要使圆在坐标原点(0,0)的x,y坐标值
g.DrawEllipse(pen, -screenWidth / 2, -dialRadius, screenWidth, screenHeight);
GraphicsState state = g.Save();
//画矩形、日期、星期几
int rectWidth = 70;
int rectHeight = 30;
g.DrawRectangle(pen, -rectWidth / 2, rectHeight, rectWidth, rectHeight);
g.DrawString(dtNow.ToString("yyyy-MM-dd"), dateFont, brush, -rectWidth / 2, rectHeight + 2);
g.DrawString(dayOfWeek.PadLeft(8, ' '), dateFont, brush, -rectWidth / 2, rectHeight + 15);
g.Restore(state);
// 画时钟的60个圆点
//Save(),Restore(state)配合使用，使得平移、缩放、旋转等操作只对它们作用域之间的代码有效，
//save开始到restore之间这绘画，就像有绘制了一个图层，restore之后将两个图层放到一起
state = g.Save();
for (int i = 0; i < 60; i++)
{
int w = i % 5 == 0 ? 5 : 3;
g.FillEllipse(brush, 0, -dialRadius, w, w);
//围绕指定点按照顺时针方向旋转角度360 / 60 = 6度
g.RotateTransform(6);
}
g.Restore(state);
//画时钟的12个数字，如果用上面RotateTransform方法则数字会倾斜、倒立，故不用
state = g.Save();
for (int i = 0; i < 12; i++)
{
//已知圆中心占坐标(x0,y0),半径r，角度a0,则圆上任一点坐标（x,y）计算：
//x = x0 + r * cos(ao * 3.14 /180)
//y = y0 + r * sin(ao * 3.14 /180)
Point point = new Point(-6, -6); //当为(0,0)时全部数字偏右下移，故手动调整
double dd = Math.PI / 180 * i * (360 / 12); //每次转360/12度
float x = point.X + (float)((dialRadius - 12) * Math.Cos(dd));
float y = point.Y + (float)((dialRadius - 12) * Math.Sin(dd));
//因为是从顺时钟3点钟开始画，所以索引i需要加上3
int j = i + 3;
if (j > 12)
j = j - 12;
g.DrawString(j.ToString(), hourFont, brush, x, y);
}
g.Restore(state);
// 画时钟的图形
state = g.Save();
g.RotateTransform((dtNow.Hour - 12 + dtNow.Minute / 60f) * 360f / 12f);
//时钟指针默认指向12点钟方向,分钟指针也一样
g.DrawPolygon(new Pen(brush), new Point[]
{
new Point(0, 20), new Point( 10, 0),
new Point(0, -60), new Point(-10, 0)
});
g.Restore(state);
// 画分钟的图形
state = g.Save();
g.RotateTransform((dtNow.Minute + dtNow.Second / 60f) * 360f / 60f);
g.DrawPolygon(new Pen(brush), new Point[]
{
new Point(0, 20), new Point( 6, 0),
new Point(0, -80), new Point(-6, 0)
});
g.Restore(state);
// 画秒钟的图形
state = g.Save();
g.RotateTransform(dtNow.Second * 360f / 60f);
g.FillRectangle(brush, -1, -dialRadius + 10, 2, dialRadius);
g.Restore(state);
}
private void UserControl1_Paint(object sender, PaintEventArgs e)
{
}
}
}
主程序代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace DynamicClock
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
UserControl1 clock = new UserControl1();
panel1.Controls.Add(clock);
}
private void timer1_Tick(object sender, EventArgs e)
{
panel1.Controls.Clear();
UserControl1 clock = new UserControl1();
panel1.Controls.Add(clock);
}
}
}