C#自定义控件旋转按钮功能

//方法中获取原点
Point centerPoint = GetCenterPoint();
#region 获取中心原点
private Point GetCenterPoint()
{
    if (this.height > this.width)
    {
        return new Point(this.width / 2, this.width / 2);
    }
    else
    {
        return new Point(this.height / 2, this.height / 2);
    }
}
#endregion

//更改坐标系原点
g.TranslateTransform(centerPoint.X, centerPoint.Y);
//旋转指定角度
if (switchStatus)
{
    g.RotateTransform(36.0f);
}
else
{
    g.RotateTransform(-36.0f);
}

//绘制外环—(Pen)-DrawEllipse
p = new Pen(this.cirInColor, this.cirOutWidth);
RectangleF rec = new RectangleF(this.cirOutGap, this.cirOutGap, (centerPoint.X - this.cirOutGap) * 2, (centerPoint.X - this.cirOutGap) * 2);
g.DrawEllipse(p, rec);
//填充内圆—(SolidBrush)-FillEllipse
sb = new SolidBrush(this.cirInColor);
rec = new RectangleF(this.cirInGap, this.cirInGap, (centerPoint.X - this.cirInGap) * 2, (centerPoint.X - this.cirInGap) * 2);
g.FillEllipse(sb, rec);

//更改坐标系原点
g.TranslateTransform(centerPoint.X, centerPoint.Y);
//填充矩形开关
rec = new RectangleF(-this.togWidth * 0.5f, this.togGap - centerPoint.Y, togWidth, (centerPoint.Y - togGap) * 2);
g.FillRectangle(new SolidBrush(this.togColor), rec);
//填充矩形开关圆点
rec = new RectangleF(-this.togWidth * 0.5f + togForeGap, this.togGap - centerPoint.Y + togForeGap, togWidth - 2 * togForeGap, togForeHeight);
g.FillEllipse(new SolidBrush(this.togForeColor), rec);

//指定字符串
rec = new RectangleF(this.width * 0.05f, 1, this.width, 20);
g.DrawString(this.textLeft, this.textFont, new SolidBrush(this.textColor), rec, sf);
rec = new RectangleF(this.width * 0.63f, 1, this.width, 20);
g.DrawString(this.textRight, this.textFont, new SolidBrush(this.textColor), rec, sf);

#region 添加事件
[Browsable(true)]
[Category("操作_G")]
[Description("双击进入事件")]
public event EventHandler MouseDown_G;   //事件声明

//初始化函数添加鼠标点击事件处理
this.MouseDown += Switch_MouseDown; ;

//鼠标点击事件处理逻辑
private void Switch_MouseDown(object sender, MouseEventArgs e)
{
    DialogResult dr = MessageBox.Show("二次确认操作？", "提示您", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
    if (dr == DialogResult.OK)
    {
        SwitchStatus = !SwitchStatus; //此处属性值，不是字段
    }
    else return;
}
#endregion

//开关状态属性
 private bool switchStatus = false;
 [Browsable(true)]
 [Category("布局_G")]
 [Description("开关状态")]
 public bool SwitchStatus
 {
     get { return switchStatus; }
     set
     {
         switchStatus = value; this.Invalidate();
         //激活触发事件
         this.MouseDown_G?.Invoke(this, null);
     }
 }

[DefaultEvent("MouseDown_G")]

private Font titleFont = new Font("微软雅黑", 12);
[Browsable(true)]
[Category("布局_G")]
[Description("标题字体")]
public Font TitleFont
{
    get { return titleFont; }
    set
    {
        titleFont = value;
        this.Invalidate();
    }
}

//画外边框
g.DrawRectangle(new Pen(this.colorBorder), new Rectangle(0, 0, this.Width - 1, this.Height - 1));
//填充抬头矩形
RectangleF rec = new RectangleF(0.5f, 0.5f, this.Width - 2, this.titleHeight);
g.FillRectangle(new SolidBrush(this.colorBack), rec);
//文本绘制
g.DrawString(this.titleText, this.titleFont, new SolidBrush(this.colorTitle), rec, sf);

//字体对齐格式
this.sf = new StringFormat();
this.sf.Alignment = StringAlignment.Center;
this.sf.LineAlignment = StringAlignment.Center;
//指定控件大小
this.Size = new System.Drawing.Size(300, 150);