/// <summary>
/// Returns a value indicating whether the specified point is contained
/// in the ellipse.
/// </summary>
/// <param name="point"></param>
/// <returns></returns>
public override bool Contains(PointF point)
{
/// TODO (CR Oct 2011): duplicated in InvariantEllipsePrimitive - should combine.
if (CoordinateSystem == CoordinateSystem.Destination)
{
point = SpatialTransform.ConvertToSource(point);
}
CoordinateSystem = CoordinateSystem.Source;
// Semi major/minor axes
float a = Width / 2;
float b = Height / 2;
RectangleF rect = BoundingBox;
ResetCoordinateSystem();
// Center of ellipse
float xCenter = rect.Left + a;
float yCenter = rect.Top + b;
float x = point.X - xCenter;
float y = point.Y - yCenter;
return((x * x) / (a * a) + (y * y) / (b * b) <= 1);
}
internal static float ConvertSweepAngle(float sweepAngle, float startAngle, SpatialTransform transform, CoordinateSystem targetSystem)
{
PointF x = new PointF(100, 0);
PointF[] startVector = new PointF[] { x };
Matrix rotation = new Matrix();
rotation.Rotate(startAngle);
rotation.TransformVectors(startVector);
PointF[] sweepVector = (PointF[])startVector.Clone();
rotation.Reset();
rotation.Rotate(sweepAngle);
rotation.TransformVectors(sweepVector);
rotation.Dispose();
SizeF startVectorTransformed, sweepVectorTransformed;
if (targetSystem == Graphics.CoordinateSystem.Destination)
{
startVectorTransformed = transform.ConvertToDestination(new SizeF(startVector[0]));
sweepVectorTransformed = transform.ConvertToDestination(new SizeF(sweepVector[0]));
}
else
{
startVectorTransformed = transform.ConvertToSource(new SizeF(startVector[0]));
sweepVectorTransformed = transform.ConvertToSource(new SizeF(sweepVector[0]));
}
// simply return the angle between the start and sweep angle, in the target system.
return((int)Math.Round(Vector.SubtendedAngle(sweepVectorTransformed.ToPointF(), PointF.Empty, startVectorTransformed.ToPointF())));
}
/// <summary>
/// Performs a hit test on the <see cref="ArcPrimitive"/> at a given point.
/// </summary>
/// <param name="point">The mouse position in destination coordinates.</param>
/// <returns>
/// <b>True</b> if <paramref name="point"/> "hits" the <see cref="ArcPrimitive"/>,
/// <b>false</b> otherwise.
/// </returns>
/// <remarks>
/// A "hit" is defined as when the mouse position is <see cref="VectorGraphic.HitTestDistance"/>
/// screen pixels away from any point on the arc.
/// </remarks>
public override bool HitTest(Point point)
{
this.CoordinateSystem = CoordinateSystem.Source;
bool result = ArcPrimitive.HitTest(
SpatialTransform.ConvertToSource(point), this.Rectangle,
this.StartAngle, this.SweepAngle,
this.SpatialTransform);
this.ResetCoordinateSystem();
return(result);
}
internal static bool HitTest(PointF point, RectangleF boundingBox, SpatialTransform transform)
{
GraphicsPath path = new GraphicsPath();
path.AddEllipse(RectangleUtilities.ConvertToPositiveRectangle(boundingBox));
Pen pen = new Pen(Brushes.White, HitTestDistance / transform.CumulativeScale);
bool result = path.IsOutlineVisible(point, pen);
path.Dispose();
pen.Dispose();
return(result);
}
/// <summary>
/// Cloning constructor.
/// </summary>
protected SpatialTransform(SpatialTransform source, ICloningContext context)
{
context.CloneFields(source, this);
if (source._cumulativeTransform != null)
{
_cumulativeTransform = source._cumulativeTransform.Clone();
}
if (source._transform != null)
{
_transform = source._transform.Clone();
}
}
internal static float ConvertStartAngle(float angle, SpatialTransform transform, CoordinateSystem targetSystem)
{
PointF xVector = new PointF(100, 0);
Matrix rotation = new Matrix();
PointF[] angleVector = new PointF[] { xVector };
rotation.Rotate(angle);
rotation.TransformVectors(angleVector);
rotation.Dispose();
SizeF xVectorTransformed, angleVectorTransformed;
if (targetSystem == Graphics.CoordinateSystem.Destination)
{
xVectorTransformed = transform.ConvertToDestination(new SizeF(xVector));
angleVectorTransformed = transform.ConvertToDestination(new SizeF(angleVector[0]));
}
else
{
xVectorTransformed = transform.ConvertToSource(new SizeF(xVector));
angleVectorTransformed = transform.ConvertToSource(new SizeF(angleVector[0]));
}
float xRotationOffset =
(int)Math.Round(Vector.SubtendedAngle(xVectorTransformed.ToPointF(), PointF.Empty, xVector));
float angleTransformed =
(int)Math.Round(Vector.SubtendedAngle(angleVectorTransformed.ToPointF(), PointF.Empty, xVectorTransformed.ToPointF()));
// have to figure out where x-axis moved to and then return the difference between the angle
// and the x-axis, where both are in 'target' coordinates.
float returnAngle = angleTransformed + xRotationOffset;
if (returnAngle < 0)
{
returnAngle += 360;
}
return(returnAngle);
}
internal void SetParentGraphic(IGraphic parentGraphic)
{
_parentGraphic = parentGraphic;
SpatialTransform.ForceRecalculation();
}