/// <summary>
/// Convert a Nucleus arc into a WPF PathFigure
/// </summary>
/// <param name="arc"></param>
/// <returns></returns>
public static Media.PathFigure Convert(Arc arc)
{
Media.PathFigure result = new Media.PathFigure();
result.StartPoint = Convert(arc.StartPoint);
double radius = arc.Circle.Radius;
if (arc.Closed)
{
//Circle!
result.Segments.Add(new Media.ArcSegment(Convert(arc.PointAt(0.5)), new W.Size(radius, radius), 0, true,
Media.SweepDirection.Clockwise, true));
result.Segments.Add(new Media.ArcSegment(Convert(arc.EndPoint), new W.Size(radius, radius), 0, false,
Media.SweepDirection.Clockwise, true));
}
else
{
bool largeArc = arc.RadianMeasure.IsReflex;
Media.SweepDirection dir = Media.SweepDirection.Clockwise;
if (!arc.IsClockwise)
{
dir = Media.SweepDirection.Counterclockwise;
}
result.Segments.Add(new Media.ArcSegment(Convert(arc.EndPoint), new W.Size(radius, radius), 0, largeArc, dir, true));
}
return(result);
}
/// <summary>
/// Convert a Nucleus PolyCurve into a WPF PathFigure
/// </summary>
/// <param name="polyCurve"></param>
/// <returns></returns>
public static Media.PathFigure Convert(PolyCurve polyCurve)
{
Media.PathFigure result = new Media.PathFigure();
if (polyCurve.SubCurves.Count > 0)
{
result.StartPoint = Convert(polyCurve.StartPoint);
foreach (Curve crv in polyCurve.SubCurves)
{
if (crv is Line)
{
result.Segments.Add(new Media.LineSegment(Convert(crv.EndPoint), true));
}
else if (crv is Arc)
{
Arc arc = ((Arc)crv);
double radius = arc.Circle.Radius;
if (arc.Closed)
{
//Circle!
result.Segments.Add(new Media.ArcSegment(Convert(arc.PointAt(0.5)), new W.Size(radius, radius), 0, true,
Media.SweepDirection.Clockwise, true));
result.Segments.Add(new Media.ArcSegment(Convert(arc.EndPoint), new W.Size(radius, radius), 0, false,
Media.SweepDirection.Clockwise, true));
}
else
{
bool largeArc = arc.RadianMeasure.IsReflex;
Media.SweepDirection dir = Media.SweepDirection.Clockwise;
if (!arc.IsClockwise)
{
dir = Media.SweepDirection.Counterclockwise;
}
result.Segments.Add(new Media.ArcSegment(Convert(arc.EndPoint), new W.Size(radius, radius), 0, largeArc, dir, true));
}
}
else if (crv is PolyLine)
{
for (int i = 1; i < crv.Vertices.Count; i++)
{
Vertex v = crv.Vertices[i];
result.Segments.Add(new Media.LineSegment(Convert(v.Position), true));
}
}
}
}
return(result);
}
/// <summary>
/// Rotate the label towards certain degree clockwise or anticlockwise
/// </summary>
/// <param name="degree">Angle in Radian</param>
/// <param name="direction">SweepDirection</param>
public Boolean RotateByVerticalOffset(Double verticalOffset, System.Windows.Media.SweepDirection direction)
{
Double offsetAngle = Math.Atan(verticalOffset / YRadiusLabel);
if (direction == SweepDirection.Counterclockwise)
{
offsetAngle *= -1;
}
Double currentMeanAngle = CurrentMeanAngle + offsetAngle;
currentMeanAngle = ResetMeanAngle(currentMeanAngle);
Point tempPosition = GetCartesianCoordinates4Labels(currentMeanAngle);
if (Math.Abs(BaseMeanAngle - ResetMeanAngle(CurrentMeanAngle + offsetAngle)) > Math.PI / 5)
{
return(false);
}
CurrentMeanAngle = currentMeanAngle;
Position = tempPosition;
return(true);
}
/// <summary>
/// 得到圆弧的几何图形;
/// </summary>
/// <param name="center"></param>
/// <param name="screenRadius"></param>
/// <param name="beginAngle"></param>
/// <param name="angle"></param>
/// <param name="smallAngle"></param>
/// <returns></returns>
private static SystemMedia.PathGeometry GetArcGeometry(Point startScreenPoint, Point endScreenPoint, double screenRadius, bool smallAngle, SystemMedia.SweepDirection sweepDirection)
{
var arcSegment = new SystemMedia.ArcSegment(endScreenPoint, new System.Windows.Size(screenRadius, screenRadius), 0D, !smallAngle, sweepDirection, true);
var segments = new SystemMedia.PathSegment[] { arcSegment };
var pathFigure = new SystemMedia.PathFigure(startScreenPoint, segments, false);
var figures = new SystemMedia.PathFigure[] { pathFigure };
arcSegment.Freeze();
pathFigure.Freeze();
return(new SystemMedia.PathGeometry(figures, SystemMedia.FillRule.EvenOdd, null));
}
