C#自定义控件四简易时钟
效果图：
简易时钟，顾名思义，简单容易，简单到什么程度呢？界面只有数字和指针，甚至连与当前时间都不能匹配！呵呵！就这么简单，学习嘛，从简单开始。
毫无疑问，这里肯定要用到Timer控件啦，每秒钟刷新界面，这样的话就要求双缓冲啦，你懂的。
第一步：添加用户控件，命名为myClock。
第二步：构造函数实例化控件和做双缓冲处理。
public myClock()
{
InitializeComponent();
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
this.SetStyle(ControlStyles.DoubleBuffer, true);
this.SetStyle(ControlStyles.ResizeRedraw, true);
this.SetStyle(ControlStyles.Selectable, true);
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
this.SetStyle(ControlStyles.UserPaint, true);
myTimer = new Timer();
myTimer.Interval = 1000;
myTimer.Enabled = true;
myTimer.Tick += new EventHandler(myTimer_Tick);
}
第三步：Paint重绘事件
private void myClock_Paint(object sender, PaintEventArgs e)
{
Graphics gra = e.Graphics;//创建一个画板
/*********************************/
//表盘上的指针
using (SolidBrush sb = new SolidBrush(Color.Blue))
{
Font f = new Font("宋体", 18);
gra.DrawString("1", f, sb, 195, 20);
gra.DrawString("2", f, sb, 235, 60);
gra.DrawString("3", f, sb, 250, 123);
gra.DrawString("4", f, sb, 235, 183);
gra.DrawString("5", f, sb, 195, 225);
gra.DrawString("6", f, sb, 125, 245);
gra.DrawString("7", f, sb, 55, 225);
gra.DrawString("8", f, sb, 15, 183);
gra.DrawString("9", f, sb, 0, 123);
gra.DrawString("10", f, sb, 15, 60);
gra.DrawString("11", f, sb, 55, 20);
gra.DrawString("12", f, sb, 125, 0);
}
//表盘的框架:黑色，宽度是3
using (Pen p = new Pen(Color.Black, 3))
{
p.DashStyle = DashStyle.Solid;
gra.DrawEllipse(p, 0, 0, 270, 270);
}
//表盘上的三个指针i,j,k;
using (Pen p1 = new Pen(Color.Red))
{
using (Pen p2 = new Pen(Color.Blue))
{
using (Pen p3 = new Pen(Color.Yellow))
{
gra.DrawPie(p3, 20, 20, 230, 230, k, 0.1f);//秒
gra.DrawPie(p2, 30, 30, 210, 210, j, 0.1f);//分
gra.DrawPie(p1, 40, 40, 190, 190, i, 0.1f);//小时
}
}
}
//指针旋转的代码
if (i < 360)
{
i += 6;
if (i == 270)
{
if (j <= 360)
{
j += 6;
if (j == 270)
{
if (k <= 360)
{
k += 30;
}
else
{
k = 30;
}
}
}
else
{
j = 6;
}
}
}
else
{
i = 6;
}
}
贴出所有代码：
//控件名：myClock
//作者：刘典武
//时间：2011-06-09
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 myControl
{
public partial class myClock : UserControl
{
public myClock()
{
InitializeComponent();
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
this.SetStyle(ControlStyles.DoubleBuffer, true);
this.SetStyle(ControlStyles.ResizeRedraw, true);
this.SetStyle(ControlStyles.Selectable, true);
this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
this.SetStyle(ControlStyles.UserPaint, true);
myTimer = new Timer();
myTimer.Interval = 1000;
myTimer.Enabled = true;
myTimer.Tick += new EventHandler(myTimer_Tick);
}
private Timer myTimer;
//定义三个变量
float i = 270, j = 270, k = 270;
private void myTimer_Tick(object sender, EventArgs e)
{
this.Invalidate();
}
private void myClock_Paint(object sender, PaintEventArgs e)
{
Graphics gra = e.Graphics;//创建一个画板
/*********************************/
//表盘上的指针
using (SolidBrush sb = new SolidBrush(Color.Blue))
{
Font f = new Font("宋体", 18);
gra.DrawString("1", f, sb, 195, 20);
gra.DrawString("2", f, sb, 235, 60);
gra.DrawString("3", f, sb, 250, 123);
gra.DrawString("4", f, sb, 235, 183);
gra.DrawString("5", f, sb, 195, 225);
gra.DrawString("6", f, sb, 125, 245);
gra.DrawString("7", f, sb, 55, 225);
gra.DrawString("8", f, sb, 15, 183);
gra.DrawString("9", f, sb, 0, 123);
gra.DrawString("10", f, sb, 15, 60);
gra.DrawString("11", f, sb, 55, 20);
gra.DrawString("12", f, sb, 125, 0);
}
//表盘的框架:黑色，宽度是3
using (Pen p = new Pen(Color.Black, 3))
{
p.DashStyle = DashStyle.Solid;
gra.DrawEllipse(p, 0, 0, 270, 270);
}
//表盘上的三个指针i,j,k;
using (Pen p1 = new Pen(Color.Red))
{
using (Pen p2 = new Pen(Color.Blue))
{
using (Pen p3 = new Pen(Color.Yellow))
{
gra.DrawPie(p3, 20, 20, 230, 230, k, 0.1f);//秒
gra.DrawPie(p2, 30, 30, 210, 210, j, 0.1f);//分
gra.DrawPie(p1, 40, 40, 190, 190, i, 0.1f);//小时
}
}
}
//指针旋转的代码
if (i < 360)
{
i += 6;
if (i == 270)
{
if (j <= 360)
{
j += 6;
if (j == 270)
{
if (k <= 360)
{
k += 30;
}
else
{
k = 30;
}
}
}
else
{
j = 6;
}
}
}
else
{
i = 6;
}
}
}
}
