/// <summary>
/// 画控件亮度拉杆
/// </summary>
/// <param name="graphics"></param>
/// <param name="r">拉杆所在圆弧的Rectangle</param>
/// <param name="percentSet">亮度百分比</param>
protected void DrawSelector(Graphics graphics, RectangleF r, float percentSet)
{
Pen pen = new Pen(Color.CadetBlue);
percentSet = Math.Max(0, percentSet);
percentSet = Math.Min(1, percentSet);
Image image = SelectorImages.GetColorPoint();
PointF Center = Util.Center(r);
graphics.TranslateTransform(Center.X, Center.Y);
float xpos = r.Top - colorSelectorSize.Width / 2;
float ypos = r.Top + r.Height / 2 - colorSelectorSize.Height;
float Angle = percentSet * 360;
graphics.RotateTransform(Angle);
Rectangle imageRect = new Rectangle(new Point((int)xpos, (int)ypos), colorSelectorSize);
graphics.DrawImage(image, imageRect);
//graphics.DrawImageUnscaled(image, (int)xpos, (int)ypos);//按原始大小
graphics.ResetTransform();
}
void DrawColorSelector(Graphics dc)
{
Rectangle r = Util.Rect(ColorSelectorRectangle);
PointF center = Util.Center(r);
Image image = SelectorImages.Image(SelectorImages.eIndexes.Donut);//实心块
dc.DrawImageUnscaled(image, (int)(center.X - image.Width / 2), (int)(center.Y - image.Height / 2));
//Pen penOut = new Pen(Color.Black); //圆圈
//dc.DrawEllipse(penOut, r);
}