/// <summary>
/// Generate a GraphicsPath for Arrow markers.
/// </summary>
/// <param name="cardinal">Enum used to indicate which direction the marker should be pointed.</param>
/// <param name="drawArea">Rectangle that defines the area the marker should be drawn within.</param>
/// <param name="penSize">Thickness of the pen used, used to offset the marker slightly.</param>
private GraphicsPath GetArrowPath(MarkerCardinal cardinal, Rectangle drawArea, float penSize)
{
var ArrowHead = _markerSize / 2f;
var HalfSize = _markerSize / 2f;
var Path = new GraphicsPath();
var Points = new List <PointF>();
var Offset = PointF.Empty;
switch (cardinal)
{
case MarkerCardinal.Top:
Offset = new PointF(0, -penSize);
Points.Add(new PointF(drawArea.Left, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Bottom));
Points.Add(new PointF(drawArea.Right, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Top));
break;
case MarkerCardinal.Bottom:
Offset = new PointF(0, penSize);
Points.Add(new PointF(drawArea.Left, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Top));
Points.Add(new PointF(drawArea.Right, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Bottom));
break;
case MarkerCardinal.Right:
Offset = new PointF(penSize, 0);
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Top));
Points.Add(new PointF(drawArea.Left, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Bottom));
Points.Add(new PointF(drawArea.Right, drawArea.Top + HalfSize));
break;
case MarkerCardinal.Left:
default:
Offset = new PointF(-penSize, 0);
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Top));
Points.Add(new PointF(drawArea.Right, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Bottom));
Points.Add(new PointF(drawArea.Left, drawArea.Top + HalfSize));
break;
}
for (var i = 0; i < Points.Count; i++)
{
var Edit = Points[i];
Edit.X += Offset.X;
Edit.Y += Offset.Y;
Points[i] = Edit;
}
Path.AddLine(Points[0], Points[1]);
Path.AddLine(Points[1], Points[2]);
Path.AddLine(Points[2], Points[1]);
Path.AddLine(Points[1], Points[3]);
Points = null;
return(Path);
}
/// <summary>
/// Generate a GraphicsPath for "V" markers.
/// </summary>
/// <param name="cardinal">Enum used to indicate which direction the marker should be pointed.</param>
/// <param name="drawArea">Rectangle that defines the area the marker should be drawn within.</param>
private GraphicsPath GetVeePath(MarkerCardinal cardinal, Rectangle drawArea)
{
var HalfSize = _markerSize / 2f;
var Path = new GraphicsPath();
var Points = new List <PointF>();
switch (cardinal)
{
case MarkerCardinal.Top:
drawArea.Offset((int)HalfSize, 0);
Points.Add(new PointF(drawArea.Left - HalfSize, drawArea.Top));
Points.Add(new PointF(drawArea.Left, drawArea.Bottom));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Top));
break;
case MarkerCardinal.Bottom:
drawArea.Offset((int)HalfSize, 0);
Points.Add(new PointF(drawArea.Left - HalfSize, drawArea.Bottom));
Points.Add(new PointF(drawArea.Left, drawArea.Top));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Bottom));
break;
case MarkerCardinal.Right:
drawArea.Offset(0, (int)HalfSize);
Points.Add(new PointF(drawArea.Right, drawArea.Top - HalfSize));
Points.Add(new PointF(drawArea.Left, drawArea.Top));
Points.Add(new PointF(drawArea.Right, drawArea.Top + HalfSize));
break;
case MarkerCardinal.Left:
default:
drawArea.Offset(0, (int)HalfSize);
Points.Add(new PointF(drawArea.Left, drawArea.Top - HalfSize));
Points.Add(new PointF(drawArea.Right, drawArea.Top));
Points.Add(new PointF(drawArea.Left, drawArea.Top + HalfSize));
break;
}
Path.AddLine(Points[0], Points[1]);
Path.AddLine(Points[1], Points[2]);
Points = null;
return(Path);
}
/// <summary>
/// Generate a GraphicsPath for Triangle markers.
/// </summary>
/// <param name="cardinal">Enum used to indicate which direction the marker should be pointed.</param>
/// <param name="drawArea">Rectangle that defines the area the marker should be drawn within.</param>
/// <param name="penSize">Thickness of the pen used, used to offset the marker slightly.</param>
private GraphicsPath GetTrianglePath(MarkerCardinal cardinal, Rectangle drawArea)
{
var HalfSize = _markerSize / 2f;
var Path = new GraphicsPath();
var Points = new List <PointF>();
switch (cardinal)
{
case MarkerCardinal.Top:
Points.Add(new PointF(drawArea.Left, drawArea.Top));
Points.Add(new PointF(drawArea.Right, drawArea.Top));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Top + _markerSize));
break;
case MarkerCardinal.Bottom:
Points.Add(new PointF(drawArea.Left, drawArea.Bottom));
Points.Add(new PointF(drawArea.Left + HalfSize, drawArea.Top));
Points.Add(new PointF(drawArea.Right, drawArea.Bottom));
break;
case MarkerCardinal.Right:
Points.Add(new PointF(drawArea.Right, drawArea.Top));
Points.Add(new PointF(drawArea.Left, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Right, drawArea.Bottom));
break;
case MarkerCardinal.Left:
default:
Points.Add(new PointF(drawArea.Left, drawArea.Top));
Points.Add(new PointF(drawArea.Right, drawArea.Top + HalfSize));
Points.Add(new PointF(drawArea.Left, drawArea.Bottom));
break;
}
Path.AddPolygon(Points.ToArray());
Points = null;
return(Path);
}
