ClockControl.cs
using System;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace ClockTime
{
/// <summary>
/// ClockControl 的摘要说明。
/// </summary>
public class ClockControl:System.Windows.Forms.UserControl
{
private DateTime dt;
public ClockControl()
{
//
// TODO: 在此处添加构造函数逻辑
//
this.ResizeRedraw=true;
this.Enabled=false;
}
public DateTime Time
{
set
{
Graphics grfx=this.CreateGraphics();
Pen pn=new Pen(this.BackColor);
InitializeCoordinates(grfx);
if(dt.Hour!=value.Hour)
{
DrawHourHand(grfx,pn);
}
if(dt.Minute!=value.Minute)
{
DrawHourHand(grfx,pn);
DrawMinuteHand(grfx,pn);
}
if(dt.Second!=value.Second)
{
DrawMinuteHand(grfx,pn);
DrawSecondHand(grfx,pn);
}
if(dt.Millisecond!=value.Millisecond)
{
DrawSecondHand(grfx,pn);
}
dt=value;
pn=new Pen(ForeColor);
DrawHourHand(grfx,pn);
DrawMinuteHand(grfx,pn);
DrawSecondHand(grfx,pn);
grfx.Dispose();
}
get
{return dt;
}
}
protected override void OnPaint(PaintEventArgs e)
{
Graphics grfx=e.Graphics;
Pen pn=new Pen(ForeColor);
SolidBrush br=new SolidBrush(ForeColor);
InitializeCoordinates(grfx);
DrawDots(grfx,br);
DrawHourHand(grfx,pn);
DrawSecondHand(grfx,pn);
DrawMinuteHand(grfx,pn);
}
protected virtual void InitializeCoordinates(Graphics grfx)
{
if(this.Width==0 || this.Height==0) return;
grfx.TranslateTransform(this.Width/2,this.Height/2);
Single fInches=Math.Min(this.Width/grfx.DpiX,this.Height/grfx.DpiY);
grfx.ScaleTransform(fInches*grfx.DpiX/2000,fInches*grfx.DpiY/2000);
}
protected virtual void DrawDots(Graphics grfx ,Brush br)
{
int i,iSize;
for(i=0;i<=59;i++)
{
if(i%5==0)
{
iSize=100;
