/// <summary>
///
/// </summary>
/// <param name="path"></param>
/// <param name="stylusShape"></param>
/// <returns></returns>
public bool HitTest(IEnumerable <Point> path, StylusShape stylusShape)
{
// Check the input parameters
if (path == null)
{
throw new System.ArgumentNullException("path");
}
if (stylusShape == null)
{
throw new System.ArgumentNullException("stylusShape");
}
if (IEnumerablePointHelper.GetCount(path) == 0)
{
return(false);
}
ErasingStroke erasingStroke = new ErasingStroke(stylusShape);
erasingStroke.MoveTo(path);
Rect erasingBounds = erasingStroke.Bounds;
if (erasingBounds.IsEmpty)
{
return(false);
}
if (erasingBounds.IntersectsWith(this.GetBounds()))
{
return(erasingStroke.HitTest(StrokeNodeIterator.GetIterator(this, this.DrawingAttributes)));
}
return(false);
}
/// <summary>
/// Erases all ink hit by the contour of an erasing stroke
/// </summary>
/// <param name="eraserShape">Shape of the eraser</param>
/// <param name="eraserPath">a path making the spine of the erasing stroke </param>
public void Erase(IEnumerable <Point> eraserPath, StylusShape eraserShape)
{
// Check the input parameters
if (eraserShape == null)
{
throw new System.ArgumentNullException(SR.Get(SRID.SCEraseShape));
}
if (eraserPath == null)
{
throw new System.ArgumentNullException(SR.Get(SRID.SCErasePath));
}
if (IEnumerablePointHelper.GetCount(eraserPath) == 0)
{
return;
}
ErasingStroke erasingStroke = new ErasingStroke(eraserShape, eraserPath);
for (int i = 0; i < this.Count; i++)
{
Stroke stroke = this[i];
List <StrokeIntersection> intersections = new List <StrokeIntersection>();
erasingStroke.EraseTest(StrokeNodeIterator.GetIterator(stroke, stroke.DrawingAttributes), intersections);
StrokeCollection eraseResult = stroke.Erase(intersections.ToArray());
UpdateStrokeCollection(stroke, eraseResult, ref i);
}
}
/// <summary>
/// Creates an incremental hit-tester for hit-testing with a shape.
/// Scenarios: stroke-erasing and point-erasing
/// </summary>
/// <param name="eraserShape">shape of the eraser</param>
/// <returns>an instance of IncrementalStrokeHitTester</returns>
public IncrementalStrokeHitTester GetIncrementalStrokeHitTester(StylusShape eraserShape)
{
if (eraserShape == null)
{
throw new System.ArgumentNullException("eraserShape");
}
return(new IncrementalStrokeHitTester(this, eraserShape));
}
/// <summary>
/// C-tor
/// </summary>
/// <param name="strokes">strokes to hit-test for erasing</param>
/// <param name="eraserShape">erasing shape</param>
internal IncrementalStrokeHitTester(StrokeCollection strokes, StylusShape eraserShape)
: base(strokes)
{
System.Diagnostics.Debug.Assert(eraserShape != null);
// Create an ErasingStroke objects that implements the actual hit-testing
_erasingStroke = new ErasingStroke(eraserShape);
}
/// <summary>
///
/// </summary>
/// <param name="nodeShape"></param>
/// <returns></returns>
internal static StrokeNodeOperations CreateInstance(StylusShape nodeShape)
{
if (nodeShape == null)
{
throw new ArgumentNullException("nodeShape");
}
if (nodeShape.IsEllipse)
{
return new EllipticalNodeOperations(nodeShape);
}
return new StrokeNodeOperations(nodeShape);
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="nodeShape"></param>
internal EllipticalNodeOperations(StylusShape nodeShape)
: base(nodeShape)
{
System.Diagnostics.Debug.Assert((nodeShape != null) && nodeShape.IsEllipse);
_radii = new Size(nodeShape.Width * 0.5, nodeShape.Height * 0.5);
// All operations with ellipses become simple(r) if transfrom ellipses into circles.
// Use the max of the radii for the radius of the circle
_radius = Math.Max(_radii.Width, _radii.Height);
// Compute ellipse-to-circle and circle-to-elliipse transforms. The former is used
// in hit-testing operations while the latter is used when computing vertices of
// a quadrangle connecting two ellipses
_transform = nodeShape.Transform;
_nodeShapeToCircle = _transform;
Debug.Assert(_nodeShapeToCircle.HasInverse, "About to invert a non-invertible transform");
_nodeShapeToCircle.Invert();
if (DoubleUtil.AreClose(_radii.Width, _radii.Height))
{
_circleToNodeShape = _transform;
}
else
{
// Reverse the rotation
if (false == DoubleUtil.IsZero(nodeShape.Rotation))
{
_nodeShapeToCircle.Rotate(-nodeShape.Rotation);
Debug.Assert(_nodeShapeToCircle.HasInverse, "Just rotated an invertible transform and produced a non-invertible one");
}
// Scale to enlarge
double sx, sy;
if (_radii.Width > _radii.Height)
{
sx = 1;
sy = _radii.Width / _radii.Height;
}
else
{
sx = _radii.Height / _radii.Width;
sy = 1;
}
_nodeShapeToCircle.Scale(sx, sy);
Debug.Assert(_nodeShapeToCircle.HasInverse, "Just scaled an invertible transform and produced a non-invertible one");
_circleToNodeShape = _nodeShapeToCircle;
_circleToNodeShape.Invert();
}
}
/// <summary>
/// Erase with an eraser with passed in shape
/// </summary>
/// <param name="eraserPath">The path to erase</param>
/// <param name="eraserShape">Shape of the eraser</param>
/// <returns></returns>
public StrokeCollection GetEraseResult(IEnumerable <Point> eraserPath, StylusShape eraserShape)
{
// Check the input parameters
if (eraserShape == null)
{
throw new System.ArgumentNullException("eraserShape");
}
if (eraserPath == null)
{
throw new System.ArgumentNullException("eraserPath");
}
return(this.Erase(this.EraseTest(eraserPath, eraserShape)));
}
/// <summary>Hit tests all segments within a contour generated with shape and path</summary>
/// <param name="shape"></param>
/// <param name="path"></param>
/// <returns>StrokeIntersection array for these segments</returns>
internal StrokeIntersection[] EraseTest(IEnumerable <Point> path, StylusShape shape)
{
System.Diagnostics.Debug.Assert(shape != null);
System.Diagnostics.Debug.Assert(path != null);
if (IEnumerablePointHelper.GetCount(path) == 0)
{
return(Array.Empty <StrokeIntersection>());
}
ErasingStroke erasingStroke = new ErasingStroke(shape, path);
List <StrokeIntersection> intersections = new List <StrokeIntersection>();
erasingStroke.EraseTest(StrokeNodeIterator.GetIterator(this, this.DrawingAttributes), intersections);
return(intersections.ToArray());
}
/// <summary>
/// Return all hit strokes that the StylusShape intersects and returns them in a StrokeCollection
/// </summary>
private StrokeCollection PointHitTest(Point point, StylusShape shape)
{
// Create the collection to return
StrokeCollection hits = new StrokeCollection();
for (int i = 0; i < this.Count; i++)
{
Stroke stroke = this[i];
if (stroke.HitTest(new Point[] { point }, shape))
{
hits.Add(stroke);
}
}
return(hits);
}
/// <summary>
/// Issue: what's the return value
/// </summary>
/// <param name="path"></param>
/// <param name="stylusShape"></param>
/// <returns></returns>
public StrokeCollection HitTest(IEnumerable <Point> path, StylusShape stylusShape)
{
// Check the input parameters
if (stylusShape == null)
{
throw new System.ArgumentNullException("stylusShape");
}
if (path == null)
{
throw new System.ArgumentNullException("path");
}
if (IEnumerablePointHelper.GetCount(path) == 0)
{
return(new StrokeCollection());
}
// validate input
ErasingStroke erasingStroke = new ErasingStroke(stylusShape, path);
Rect erasingBounds = erasingStroke.Bounds;
if (erasingBounds.IsEmpty)
{
return(new StrokeCollection());
}
StrokeCollection hits = new StrokeCollection();
foreach (Stroke stroke in this)
{
// samgeo - Presharp issue
// Presharp gives a warning when get methods might deref a null. It's complaining
// here that 'stroke'' could be null, but StrokeCollection never allows nulls to be added
// so this is not possible
#pragma warning disable 1634, 1691
#pragma warning suppress 6506
if (erasingBounds.IntersectsWith(stroke.GetBounds()) &&
erasingStroke.HitTest(StrokeNodeIterator.GetIterator(stroke, stroke.DrawingAttributes)))
{
hits.Add(stroke);
}
#pragma warning restore 1634, 1691
}
return(hits);
}
/// <summary>
/// Returns a Bezier smoothed version of the StylusPoints
/// </summary>
/// <returns></returns>
public StylusPointCollection GetBezierStylusPoints()
{
// Since we can't compute Bezier for single point stroke, we should return.
if (_stylusPoints.Count < 2)
{
return(_stylusPoints);
}
// Construct the Bezier approximation
Bezier bezier = new Bezier();
if (!bezier.ConstructBezierState(_stylusPoints,
DrawingAttributes.FittingError))
{
//construction failed, return a clone of the original points
return(_stylusPoints.Clone());
}
double tolerance = 0.5;
StylusShape stylusShape = this.DrawingAttributes.StylusShape;
if (null != stylusShape)
{
Rect shapeBoundingBox = stylusShape.BoundingBox;
double min = Math.Min(shapeBoundingBox.Width, shapeBoundingBox.Height);
tolerance = Math.Log10(min + min);
tolerance *= (StrokeCollectionSerializer.AvalonToHimetricMultiplier / 2);
if (tolerance < 0.5)
{
//don't allow tolerance to drop below .5 or we
//can wind up with an huge amount of bezier points
tolerance = 0.5;
}
}
List <Point> bezierPoints = bezier.Flatten(tolerance);
return(GetInterpolatedStylusPoints(bezierPoints));
}
/// <summary>
/// Create a point eraser cursor from StylusShape
/// </summary>
/// <param name="stylusShape">Eraser Shape</param>
/// <param name="tranform">Transform</param>
/// <returns></returns>
internal static Cursor GetPointEraserCursor(StylusShape stylusShape, Matrix tranform)
{
Debug.Assert(DoubleUtil.IsZero(tranform.OffsetX) && DoubleUtil.IsZero(tranform.OffsetY), "The EraserShape cannot be translated.");
Debug.Assert(tranform.HasInverse, "The transform has to be invertable.");
// Create a DA with IsHollow being set. A point eraser will be rendered to a hollow stroke.
DrawingAttributes da = new DrawingAttributes();
if (stylusShape.GetType() == typeof(RectangleStylusShape))
{
da.StylusTip = StylusTip.Rectangle;
}
else
{
da.StylusTip = StylusTip.Ellipse;
}
da.Height = stylusShape.Height;
da.Width = stylusShape.Width;
da.Color = Colors.Black;
if ( !tranform.IsIdentity )
{
// Apply the LayoutTransform and/or RenderTransform
da.StylusTipTransform *= tranform;
}
if ( !DoubleUtil.IsZero(stylusShape.Rotation) )
{
// Apply the tip rotation
Matrix rotationMatrix = Matrix.Identity;
rotationMatrix.Rotate(stylusShape.Rotation);
da.StylusTipTransform *= rotationMatrix;
}
// Forward to GetPenCursor.
return GetPenCursor(da, true, false/*isRightToLeft*/);
}
/// <summary>
/// Erase with an eraser with passed in shape
/// </summary>
/// <param name="eraserPath">The path to erase</param>
/// <param name="eraserShape">Shape of the eraser</param>
/// <returns></returns>
public StrokeCollection GetEraseResult(IEnumerable<Point> eraserPath, StylusShape eraserShape)
{
// Check the input parameters
if (eraserShape == null)
{
throw new System.ArgumentNullException("eraserShape");
}
if (eraserPath == null)
{
throw new System.ArgumentNullException("eraserPath");
}
return this.Erase(this.EraseTest(eraserPath, eraserShape));
}
/// <summary>
/// C-tor
/// </summary>
/// <param name="strokes">strokes to hit-test for erasing</param>
/// <param name="eraserShape">erasing shape</param>
internal IncrementalStrokeHitTester(StrokeCollection strokes, StylusShape eraserShape)
: base(strokes)
{
System.Diagnostics.Debug.Assert(eraserShape != null);
// Create an ErasingStroke objects that implements the actual hit-testing
_erasingStroke = new ErasingStroke(eraserShape);
}
/// <summary>
///
/// </summary>
/// <param name="path"></param>
/// <param name="stylusShape"></param>
/// <returns></returns>
public bool HitTest(IEnumerable<Point> path, StylusShape stylusShape)
{
// Check the input parameters
if (path == null)
{
throw new System.ArgumentNullException("path");
}
if (stylusShape == null)
{
throw new System.ArgumentNullException("stylusShape");
}
if (IEnumerablePointHelper.GetCount(path) == 0)
{
return false;
}
ErasingStroke erasingStroke = new ErasingStroke(stylusShape);
erasingStroke.MoveTo(path);
Rect erasingBounds = erasingStroke.Bounds;
if (erasingBounds.IsEmpty)
{
return false;
}
if (erasingBounds.IntersectsWith(this.GetBounds()))
{
return erasingStroke.HitTest(StrokeNodeIterator.GetIterator(this, this.DrawingAttributes));
}
return false;
}
/// <summary>Hit tests all segments within a contour generated with shape and path</summary>
/// <param name="shape"></param>
/// <param name="path"></param>
/// <returns>StrokeIntersection array for these segments</returns>
internal StrokeIntersection[] EraseTest(IEnumerable<Point> path, StylusShape shape)
{
System.Diagnostics.Debug.Assert(shape != null);
System.Diagnostics.Debug.Assert(path != null);
if (IEnumerablePointHelper.GetCount(path) == 0)
{
return new StrokeIntersection[0];
}
ErasingStroke erasingStroke = new ErasingStroke(shape, path);
List<StrokeIntersection> intersections = new List<StrokeIntersection>();
erasingStroke.EraseTest(StrokeNodeIterator.GetIterator(this, this.DrawingAttributes), intersections);
return intersections.ToArray();
}
/// <summary>
/// Constructor
/// </summary>
/// <param name="nodeShape">shape of the nodes</param>
internal StrokeNodeOperations(StylusShape nodeShape)
{
System.Diagnostics.Debug.Assert(nodeShape != null);
_vertices = nodeShape.GetVerticesAsVectors();
}
public bool HitTest(IEnumerable<System.Windows.Point> path, StylusShape stylusShape)
{
return default(bool);
}
public IncrementalStrokeHitTester GetIncrementalStrokeHitTester(StylusShape eraserShape)
{
return(default(IncrementalStrokeHitTester));
}
public void Erase(IEnumerable <System.Windows.Point> eraserPath, StylusShape eraserShape)
{
}
public System.Windows.Ink.StrokeCollection HitTest(IEnumerable <System.Windows.Point> path, StylusShape stylusShape)
{
return(default(System.Windows.Ink.StrokeCollection));
}
public StrokeCollection GetEraseResult(IEnumerable <System.Windows.Point> eraserPath, StylusShape eraserShape)
{
return(default(StrokeCollection));
}
/// <summary>
/// Constructor for an incremental node enumerator that builds nodes
/// from array(s) of points and a given stylus shape.
/// </summary>
/// <param name="nodeShape">a shape that defines the stroke contour</param>
internal StrokeNodeIterator(StylusShape nodeShape)
: this( null, //stylusPoints
StrokeNodeOperations.CreateInstance(nodeShape),
false) //usePressure)
{
}
/// <summary>
/// Constructor for incremental erasing
/// </summary>
/// <param name="erasingShape">The shape of the eraser's tip</param>
internal ErasingStroke(StylusShape erasingShape)
{
System.Diagnostics.Debug.Assert(erasingShape != null);
_nodeIterator = new StrokeNodeIterator(erasingShape);
}
public StrokeCollection GetEraseResult(IEnumerable<System.Windows.Point> eraserPath, StylusShape eraserShape)
{
return default(StrokeCollection);
}
public bool HitTest(IEnumerable <System.Windows.Point> path, StylusShape stylusShape)
{
return(default(bool));
}
/// <summary>
/// Constructor for static (atomic) erasing
/// </summary>
/// <param name="erasingShape">The shape of the eraser's tip</param>
/// <param name="path">the spine of the erasing stroke</param>
internal ErasingStroke(StylusShape erasingShape, IEnumerable<Point> path)
: this(erasingShape)
{
MoveTo(path);
}
