DateTime Time;
private void timer_Tick(object sender,EventArgs e)
{
this.Time = DateTime.Now;
Invalidate();
}
private void UCTime_Paint(object sender, PaintEventArgs e)
{
Graphics dc = e.Graphics;
Pen pn = new Pen(ForeColor);
SolidBrush br = new SolidBrush(ForeColor);
InitCoordinates(dc); //设置绘画的坐标变换
DrawDots(dc, br); //绘画范围界面
DrawHourHand(dc, pn); //绘画时针，计算旋转的度数
DrawMinuteHand(dc, pn); //绘画分针
DrawSecondHand(dc, pn); //绘画秒针
}
/// <summary>
/// 设置绘画的坐标变换
/// </summary>
/// <param name="dc">画布</param>
protected void InitCoordinates(Graphics dc)
{
if (this.Width == 0 || this.Height == 0)
return;
dc.TranslateTransform(this.Width / 2, this.Height / 2); //平移坐标原点
dc.ScaleTransform(this.Height / 250F, this.Width / 250F); //调整比例大小
}
/// <summary>
/// 绘画范围界面
/// </summary>
/// <param name="dc">画布</param>
/// <param name="brush">笔刷</param>
protected void DrawDots(Graphics dc, Brush brush)
{
int iSize;
for (int i = 0; i <= 59; i++)
{
if (i % 5 == 0)
iSize = 15;
else
iSize = 5;
dc.FillEllipse(brush,-iSize/2,-100-iSize/2,iSize,iSize);
dc.RotateTransform(6);
}
}
/// <summary>
/// 绘画时针
/// </summary>
/// <param name="grfx">画布</param>
/// <param name="pn">笔</param>
protected virtual void DrawHourHand(Graphics grfx, Pen pn)
{
GraphicsState gs = grfx.Save();
//12个小时一共360度，一刻钟30度
grfx.RotateTransform(360.0F * Time.Hour / 12 + 30.0F * Time.Minute / 60);
grfx.DrawLine(pn, 0, 0, 0, -50);
grfx.Restore(gs);
}
/// <summary>
/// 绘画分针
/// </summary>
/// <param name="grfx">画布</param>
/// <param name="pn">笔</param>
protected virtual void DrawMinuteHand(Graphics grfx, Pen pn)
{
GraphicsState gs = grfx.Save();
//每分钟6度
grfx.RotateTransform(360.0F * Time.Minute / 60 + 6.0F * Time.Second / 60);
grfx.DrawLine(pn, 0, 0, 0, -70);
grfx.Restore(gs);
}
/// <summary>
/// 绘画秒针
/// </summary>
/// <param name="grfx">画布</param>
/// <param name="pn">笔</param>
protected virtual void DrawSecondHand(Graphics grfx, Pen pn)
{
GraphicsState gs = grfx.Save();
grfx.RotateTransform(360.0F * Time.Second / 60);
grfx.DrawLine(pn, 0, 0, 0, -100);
grfx.Restore(gs);
}