/// <summary>
/// 绘制控件
/// </summary>
/// <param name="drawingContext"></param>
protected override void OnRender(DrawingContext drawingContext)
{
if (Child != null)
{
Geometry cg = null;
Brush brush = null;
//DpiScale dpi = base.getd();
Pen pen = new Pen();
pen.Brush = this.BorderBrush;
//pen.Thickness = BorderThickness * 0.5;
pen.Thickness = AngleBorder.RoundLayoutValue(BorderThickness.Left, FrameworkElementExtend.DpiScaleX);
switch (Placement)
{
case EnumPlacement.LeftTop:
case EnumPlacement.LeftBottom:
case EnumPlacement.LeftCenter:
//生成小尾巴在左侧的图形和底色
cg = CreateGeometryTailAtLeft();
brush = CreateFillBrush();
break;
case EnumPlacement.RightTop:
case EnumPlacement.RightCenter:
case EnumPlacement.RightBottom:
//生成小尾巴在右侧的图形和底色
cg = CreateGeometryTailAtRight();
brush = CreateFillBrush();
break;
case EnumPlacement.TopLeft:
case EnumPlacement.TopCenter:
case EnumPlacement.TopRight:
//生成小尾巴在右侧的图形和底色
cg = CreateGeometryTailAtTop();
brush = CreateFillBrush();
break;
case EnumPlacement.BottomLeft:
case EnumPlacement.BottomCenter:
case EnumPlacement.BottomRight:
//生成小尾巴在右侧的图形和底色
cg = CreateGeometryTailAtBottom();
brush = CreateFillBrush();
break;
default:
break;
}
GuidelineSet guideLines = new GuidelineSet();
drawingContext.PushGuidelineSet(guideLines);
drawingContext.DrawGeometry(brush, pen, cg);
}
}
private static double RoundLayoutValue(double value, double dpiScale)
{
double num;
if (!AngleBorder.AreClose(dpiScale, 1.0))
{
num = Math.Round(value * dpiScale) / dpiScale;
if (double.IsInfinity(num) || AngleBorder.AreClose(num, 1.7976931348623157E+308))
{
num = value;
}
}
else
{
num = Math.Round(value);
}
return(num);
}