755 lines
30 KiB
C#
755 lines
30 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Windows;
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using System.Windows.Media;
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namespace HandyControl.Expression.Drawing
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{
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internal static class PathSegmentHelper
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{
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public static PathSegment ApplyTransform(PathSegment segment, Point start, GeneralTransform transform)
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{
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return PathSegmentImplementation.Create(segment, start).ApplyTransform(transform);
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}
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public static PathSegment ArcToBezierSegments(ArcSegment arcSegment, Point startPoint)
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{
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var isStroked = arcSegment.IsStroked();
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ArcToBezierHelper.ArcToBezier(startPoint.X, startPoint.Y, arcSegment.Size.Width,
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arcSegment.Size.Height, arcSegment.RotationAngle, arcSegment.IsLargeArc,
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arcSegment.SweepDirection == SweepDirection.Clockwise, arcSegment.Point.X, arcSegment.Point.Y,
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out var pointArray, out var num);
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switch (num)
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{
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case -1:
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return null;
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case 0:
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return CreateLineSegment(arcSegment.Point, isStroked);
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case 1:
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return CreateBezierSegment(pointArray[0], pointArray[1], pointArray[2], isStroked);
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}
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return CreatePolyBezierSegment(pointArray, 0, num * 3, isStroked);
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}
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public static ArcSegment CreateArcSegment(Point point, Size size, bool isLargeArc, bool clockwise,
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double rotationAngle = 0.0, bool isStroked = true)
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{
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var dependencyObject = new ArcSegment();
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dependencyObject.SetIfDifferent(ArcSegment.PointProperty, point);
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dependencyObject.SetIfDifferent(ArcSegment.SizeProperty, size);
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dependencyObject.SetIfDifferent(ArcSegment.IsLargeArcProperty, isLargeArc);
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dependencyObject.SetIfDifferent(ArcSegment.SweepDirectionProperty,
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clockwise ? SweepDirection.Clockwise : SweepDirection.Counterclockwise);
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dependencyObject.SetIfDifferent(ArcSegment.RotationAngleProperty, rotationAngle);
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dependencyObject.SetIsStroked(isStroked);
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return dependencyObject;
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}
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public static BezierSegment CreateBezierSegment(Point point1, Point point2, Point point3,
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bool isStroked = true)
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{
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var segment = new BezierSegment
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{
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Point1 = point1,
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Point2 = point2,
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Point3 = point3
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};
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segment.SetIsStroked(isStroked);
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return segment;
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}
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public static LineSegment CreateLineSegment(Point point, bool isStroked = true)
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{
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var segment = new LineSegment
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{
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Point = point
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};
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segment.SetIsStroked(isStroked);
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return segment;
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}
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public static PolyBezierSegment CreatePolyBezierSegment(IList<Point> points, int start, int count,
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bool isStroked = true)
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{
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if (points == null) throw new ArgumentNullException(nameof(points));
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count = count / 3 * 3;
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if (count < 0 || points.Count < start + count) throw new ArgumentOutOfRangeException(nameof(count));
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var segment = new PolyBezierSegment
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{
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Points = new PointCollection()
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};
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for (var i = 0; i < count; i++) segment.Points.Add(points[start + i]);
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segment.SetIsStroked(isStroked);
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return segment;
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}
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public static PolyLineSegment CreatePolylineSegment(IList<Point> points, int start, int count,
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bool isStroked = true)
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{
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if (count < 0 || points.Count < start + count) throw new ArgumentOutOfRangeException(nameof(count));
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var segment = new PolyLineSegment
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{
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Points = new PointCollection()
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};
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for (var i = 0; i < count; i++) segment.Points.Add(points[start + i]);
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segment.SetIsStroked(isStroked);
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return segment;
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}
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public static PolyQuadraticBezierSegment CreatePolyQuadraticBezierSegment(IList<Point> points,
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int start, int count, bool isStroked = true)
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{
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if (points == null) throw new ArgumentNullException(nameof(points));
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count = count / 2 * 2;
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if (count < 0 || points.Count < start + count) throw new ArgumentOutOfRangeException(nameof(count));
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var segment = new PolyQuadraticBezierSegment
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{
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Points = new PointCollection()
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};
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for (var i = 0; i < count; i++) segment.Points.Add(points[start + i]);
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segment.SetIsStroked(isStroked);
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return segment;
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}
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public static QuadraticBezierSegment CreateQuadraticBezierSegment(Point point1, Point point2,
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bool isStroked = true)
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{
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var segment = new QuadraticBezierSegment
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{
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Point1 = point1,
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Point2 = point2
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};
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segment.SetIsStroked(isStroked);
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return segment;
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}
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public static void FlattenSegment(this PathSegment segment, IList<Point> points, Point start,
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double tolerance)
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{
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PathSegmentImplementation.Create(segment, start).Flatten(points, tolerance);
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}
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public static Point GetLastPoint(this PathSegment segment)
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{
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return segment.GetPoint(-1);
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}
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public static Point GetPoint(this PathSegment segment, int index)
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{
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return PathSegmentImplementation.Create(segment).GetPoint(index);
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}
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public static int GetPointCount(this PathSegment segment)
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{
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if (segment is ArcSegment) return 1;
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if (segment is LineSegment) return 1;
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if (segment is QuadraticBezierSegment) return 2;
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if (segment is BezierSegment) return 3;
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if (segment is PolyLineSegment segment2) return segment2.Points.Count;
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if (segment is PolyQuadraticBezierSegment segment3) return segment3.Points.Count / 2 * 2;
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if (segment is PolyBezierSegment segment4) return segment4.Points.Count / 3 * 3;
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return 0;
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}
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public static IEnumerable<SimpleSegment> GetSimpleSegments(this PathSegment segment, Point start)
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{
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return PathSegmentImplementation.Create(segment, start).GetSimpleSegments();
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}
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public static bool IsEmpty(this PathSegment segment)
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{
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return segment.GetPointCount() == 0;
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}
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private static void SetIsStroked(this PathSegment segment, bool isStroked)
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{
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if (segment.IsStroked != isStroked) segment.IsStroked = isStroked;
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}
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public static bool SyncPolyBezierSegment(PathSegmentCollection collection, int index,
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IList<Point> points, int start, int count)
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{
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if (collection == null) throw new ArgumentNullException(nameof(collection));
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if (index < 0 || index >= collection.Count) throw new ArgumentOutOfRangeException(nameof(index));
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if (points == null) throw new ArgumentNullException(nameof(points));
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if (start < 0) throw new ArgumentOutOfRangeException(nameof(start));
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if (count < 0) throw new ArgumentOutOfRangeException(nameof(count));
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if (points.Count < start + count) throw new ArgumentOutOfRangeException(nameof(count));
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var flag = false;
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count = count / 3 * 3;
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var segment = collection[index] as PolyBezierSegment;
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if (segment == null)
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{
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collection[index] = segment = new PolyBezierSegment();
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flag = true;
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}
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segment.Points.EnsureListCount(count);
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for (var i = 0; i < count; i++)
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if (segment.Points[i] != points[i + start])
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{
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segment.Points[i] = points[i + start];
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flag = true;
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}
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return flag;
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}
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public static bool SyncPolylineSegment(PathSegmentCollection collection, int index,
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IList<Point> points, int start, int count)
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{
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if (collection == null) throw new ArgumentNullException(nameof(collection));
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if (index < 0 || index >= collection.Count) throw new ArgumentOutOfRangeException(nameof(index));
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if (points == null) throw new ArgumentNullException(nameof(points));
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if (start < 0) throw new ArgumentOutOfRangeException(nameof(start));
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if (count < 0) throw new ArgumentOutOfRangeException(nameof(count));
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if (points.Count < start + count) throw new ArgumentOutOfRangeException(nameof(count));
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var flag = false;
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var segment = collection[index] as PolyLineSegment;
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if (segment == null)
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{
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collection[index] = segment = new PolyLineSegment();
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flag = true;
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}
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flag |= segment.Points.EnsureListCount(count);
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for (var i = 0; i < count; i++)
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if (segment.Points[i] != points[i + start])
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{
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segment.Points[i] = points[i + start];
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flag = true;
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}
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return flag;
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}
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private class ArcSegmentImplementation : PathSegmentImplementation
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{
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private ArcSegment _segment;
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public override PathSegment ApplyTransform(GeneralTransform transform)
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{
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var segment = ArcToBezierSegments(_segment, Start);
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if (segment != null) return PathSegmentHelper.ApplyTransform(segment, Start, transform);
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_segment.Point = transform.Transform(_segment.Point);
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return _segment;
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}
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public static PathSegmentImplementation Create(ArcSegment source)
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{
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if (source != null) return new ArcSegmentImplementation {_segment = source};
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return null;
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}
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public override void Flatten(IList<Point> points, double tolerance)
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{
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var segment = ArcToBezierSegments(_segment, Start);
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segment?.FlattenSegment(points, Start, tolerance);
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}
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public override Point GetPoint(int index)
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{
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if (index < -1 || index > 0) throw new ArgumentOutOfRangeException(nameof(index));
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return _segment.Point;
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}
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public override IEnumerable<SimpleSegment> GetSimpleSegments()
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{
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var segment = ArcToBezierSegments(_segment, Start);
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if (segment != null) return segment.GetSimpleSegments(Start);
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return Enumerable.Empty<SimpleSegment>();
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}
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}
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private static class ArcToBezierHelper
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{
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private static bool AcceptRadius(double rHalfChord2, double rFuzz2, ref double rRadius)
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{
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var flag = rRadius * rRadius > rHalfChord2 * rFuzz2;
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if (flag && rRadius < 0.0) rRadius = -rRadius;
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return flag;
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}
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public static void ArcToBezier(double xStart, double yStart, double xRadius, double yRadius,
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double rRotation, bool fLargeArc, bool fSweepUp, double xEnd, double yEnd, out Point[] pPt,
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out int cPieces)
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{
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var num = 1E-06;
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pPt = new Point[12];
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var num12 = num * num;
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var flag = false;
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cPieces = -1;
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var num2 = 0.5 * (xEnd - xStart);
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var num3 = 0.5 * (yEnd - yStart);
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var num4 = num2 * num2 + num3 * num3;
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if (num4 >= num12)
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{
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if (!AcceptRadius(num4, num12, ref xRadius) || !AcceptRadius(num4, num12, ref yRadius))
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{
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cPieces = 0;
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}
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else
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{
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double num5;
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double num6;
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// ReSharper disable once InlineOutVariableDeclaration
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double num7;
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// ReSharper disable once InlineOutVariableDeclaration
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double num8;
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double num9;
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double num10;
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Point point4;
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if (Math.Abs(rRotation) < num)
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{
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num5 = 1.0;
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num6 = 0.0;
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}
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else
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{
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rRotation = -rRotation * 3.1415926535897931 / 180.0;
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num5 = Math.Cos(rRotation);
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num6 = Math.Sin(rRotation);
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var num15 = num2 * num5 - num3 * num6;
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num3 = num2 * num6 + num3 * num5;
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num2 = num15;
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}
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num2 /= xRadius;
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num3 /= yRadius;
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num4 = num2 * num2 + num3 * num3;
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if (num4 > 1.0)
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{
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var num16 = Math.Sqrt(num4);
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xRadius *= num16;
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yRadius *= num16;
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num9 = num10 = 0.0;
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flag = true;
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num2 /= num16;
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num3 /= num16;
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}
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else
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{
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var num17 = Math.Sqrt((1.0 - num4) / num4);
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if (fLargeArc != fSweepUp)
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{
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num9 = -num17 * num3;
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num10 = num17 * num2;
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}
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else
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{
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num9 = num17 * num3;
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num10 = -num17 * num2;
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}
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}
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var ptStart = new Point(-num2 - num9, -num3 - num10);
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var ptEnd = new Point(num2 - num9, num3 - num10);
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var matrix = new Matrix(num5 * xRadius, -num6 * xRadius, num6 * yRadius,
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num5 * yRadius, 0.5 * (xEnd + xStart), 0.5 * (yEnd + yStart));
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if (!flag)
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{
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matrix.OffsetX += matrix.M11 * num9 + matrix.M21 * num10;
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matrix.OffsetY += matrix.M12 * num9 + matrix.M22 * num10;
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}
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GetArcAngle(ptStart, ptEnd, fLargeArc, fSweepUp, out num7, out num8, out cPieces);
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var bezierDistance = GetBezierDistance(num7);
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if (!fSweepUp) bezierDistance = -bezierDistance;
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var rhs = new Point(-bezierDistance * ptStart.Y, bezierDistance * ptStart.X);
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var index = 0;
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pPt = new Point[cPieces * 3];
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for (var i = 1; i < cPieces; i++)
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{
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var lhs = new Point(ptStart.X * num7 - ptStart.Y * num8,
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ptStart.X * num8 + ptStart.Y * num7);
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point4 = new Point(-bezierDistance * lhs.Y, bezierDistance * lhs.X);
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pPt[index++] = matrix.Transform(ptStart.Plus(rhs));
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pPt[index++] = matrix.Transform(lhs.Minus(point4));
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pPt[index++] = matrix.Transform(lhs);
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ptStart = lhs;
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rhs = point4;
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}
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point4 = new Point(-bezierDistance * ptEnd.Y, bezierDistance * ptEnd.X);
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pPt[index++] = matrix.Transform(ptStart.Plus(rhs));
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pPt[index++] = matrix.Transform(ptEnd.Minus(point4));
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pPt[index] = new Point(xEnd, yEnd);
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}
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}
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}
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private static void GetArcAngle(Point ptStart, Point ptEnd, bool fLargeArc, bool fSweepUp,
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out double rCosArcAngle, out double rSinArcAngle, out int cPieces)
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{
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rCosArcAngle = GeometryHelper.Dot(ptStart, ptEnd);
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rSinArcAngle = GeometryHelper.Determinant(ptStart, ptEnd);
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if (rCosArcAngle >= 0.0)
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{
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if (!fLargeArc)
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{
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cPieces = 1;
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return;
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}
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cPieces = 4;
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}
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else if (fLargeArc)
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{
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cPieces = 3;
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}
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else
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{
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cPieces = 2;
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}
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var d = Math.Atan2(rSinArcAngle, rCosArcAngle);
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if (fSweepUp)
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{
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if (d < 0.0) d += 6.2831853071795862;
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}
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else if (d > 0.0)
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{
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d -= 6.2831853071795862;
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}
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d /= cPieces;
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rCosArcAngle = Math.Cos(d);
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rSinArcAngle = Math.Sin(d);
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}
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private static double GetBezierDistance(double rDot, double rRadius = 1.0)
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{
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var num = rRadius * rRadius;
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var num5 = 0.0;
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var d = 0.5 * (num + rDot);
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if (d < 0.0) return num5;
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var num3 = num - d;
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if (num3 <= 0.0) return num5;
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var num4 = Math.Sqrt(num3);
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var num2 = 4.0 * (rRadius - Math.Sqrt(d)) / 3.0;
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if (num2 <= num4 * 1E-06) return 0.0;
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return num2 / num4;
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}
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}
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private class BezierSegmentImplementation : PathSegmentImplementation
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{
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private BezierSegment _segment;
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public override PathSegment ApplyTransform(GeneralTransform transform)
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{
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_segment.Point1 = transform.Transform(_segment.Point1);
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_segment.Point2 = transform.Transform(_segment.Point2);
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_segment.Point3 = transform.Transform(_segment.Point3);
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return _segment;
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}
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public static PathSegmentImplementation Create(BezierSegment source)
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{
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if (source != null) return new BezierSegmentImplementation {_segment = source};
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return null;
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}
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public override void Flatten(IList<Point> points, double tolerance)
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{
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Point[] controlPoints = {Start, _segment.Point1, _segment.Point2, _segment.Point3};
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var resultPolyline = new List<Point>();
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BezierCurveFlattener.FlattenCubic(controlPoints, tolerance, resultPolyline, true);
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points.AddRange(resultPolyline);
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}
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public override Point GetPoint(int index)
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{
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if (index < -1 || index > 2) throw new ArgumentOutOfRangeException(nameof(index));
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if (index == 0) return _segment.Point1;
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if (index == 1) return _segment.Point2;
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return _segment.Point3;
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}
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public override IEnumerable<SimpleSegment> GetSimpleSegments()
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{
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yield return SimpleSegment.Create(Start, _segment.Point1, _segment.Point2, _segment.Point3);
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}
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}
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private class LineSegmentImplementation : PathSegmentImplementation
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{
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private LineSegment _segment;
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public override PathSegment ApplyTransform(GeneralTransform transform)
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{
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_segment.Point = transform.Transform(_segment.Point);
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return _segment;
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}
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public static PathSegmentImplementation Create(LineSegment source)
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{
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if (source != null) return new LineSegmentImplementation {_segment = source};
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return null;
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}
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public override void Flatten(IList<Point> points, double tolerance)
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{
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points.Add(_segment.Point);
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}
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public override Point GetPoint(int index)
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{
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if (index < -1 || index > 0) throw new ArgumentOutOfRangeException(nameof(index));
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return _segment.Point;
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}
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public override IEnumerable<SimpleSegment> GetSimpleSegments()
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{
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yield return SimpleSegment.Create(Start, _segment.Point);
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}
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}
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private abstract class PathSegmentImplementation
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{
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protected Point Start { get; private set; }
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public abstract PathSegment ApplyTransform(GeneralTransform transform);
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public static PathSegmentImplementation Create(PathSegment segment)
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{
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PathSegmentImplementation implementation;
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if ((implementation = BezierSegmentImplementation.Create(segment as BezierSegment)) == null &&
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(implementation = LineSegmentImplementation.Create(segment as LineSegment)) == null &&
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(implementation = ArcSegmentImplementation.Create(segment as ArcSegment)) == null &&
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(implementation = PolyLineSegmentImplementation.Create(segment as PolyLineSegment)) ==
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null &&
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(implementation = PolyBezierSegmentImplementation.Create(segment as PolyBezierSegment)) ==
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null &&
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(implementation =
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QuadraticBezierSegmentImplementation.Create(segment as QuadraticBezierSegment)) ==
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null &&
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(implementation =
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PolyQuadraticBezierSegmentImplementation.Create(segment as PolyQuadraticBezierSegment)
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) == null)
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throw new NotSupportedException(string.Format(CultureInfo.CurrentCulture,
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ExceptionStringTable.TypeNotSupported, new object[] {segment.GetType().FullName}));
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return implementation;
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}
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public static PathSegmentImplementation Create(PathSegment segment, Point start)
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{
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var implementation = Create(segment);
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implementation.Start = start;
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return implementation;
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}
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public abstract void Flatten(IList<Point> points, double tolerance);
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public abstract Point GetPoint(int index);
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public abstract IEnumerable<SimpleSegment> GetSimpleSegments();
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}
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private class PolyBezierSegmentImplementation : PathSegmentImplementation
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{
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private PolyBezierSegment _segment;
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public override PathSegment ApplyTransform(GeneralTransform transform)
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{
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_segment.Points.ApplyTransform(transform);
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return _segment;
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}
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public static PathSegmentImplementation Create(PolyBezierSegment source)
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{
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if (source != null) return new PolyBezierSegmentImplementation {_segment = source};
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return null;
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}
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public override void Flatten(IList<Point> points, double tolerance)
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{
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var start = Start;
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var num = _segment.Points.Count / 3 * 3;
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for (var i = 0; i < num; i += 3)
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{
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Point[] controlPoints = {start, _segment.Points[i], _segment.Points[i + 1], _segment.Points[i + 2]};
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var resultPolyline = new List<Point>();
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BezierCurveFlattener.FlattenCubic(controlPoints, tolerance, resultPolyline, true);
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points.AddRange(resultPolyline);
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start = _segment.Points[i + 2];
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}
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}
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public override Point GetPoint(int index)
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{
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var num = _segment.Points.Count / 3 * 3;
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if (index < -1 || index > num - 1) throw new ArgumentOutOfRangeException(nameof(index));
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if (index != -1) return _segment.Points[index];
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return _segment.Points[num - 1];
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}
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public override IEnumerable<SimpleSegment> GetSimpleSegments()
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{
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var start = Start;
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IList<Point> points = _segment.Points;
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var iteratorVariable2 = _segment.Points.Count / 3;
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var iteratorVariable3 = 0;
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while (true)
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{
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if (iteratorVariable3 >= iteratorVariable2) yield break;
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var iteratorVariable4 = iteratorVariable3 * 3;
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yield return SimpleSegment.Create(start, points[iteratorVariable4],
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points[iteratorVariable4 + 1], points[iteratorVariable4 + 2]);
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start = points[iteratorVariable4 + 2];
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iteratorVariable3++;
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}
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}
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}
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private class PolyLineSegmentImplementation : PathSegmentImplementation
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{
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private PolyLineSegment _segment;
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|
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public override PathSegment ApplyTransform(GeneralTransform transform)
|
|
{
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_segment.Points.ApplyTransform(transform);
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return _segment;
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|
}
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|
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public static PathSegmentImplementation Create(PolyLineSegment source)
|
|
{
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if (source != null) return new PolyLineSegmentImplementation {_segment = source};
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return null;
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|
}
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|
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public override void Flatten(IList<Point> points, double tolerance)
|
|
{
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points.AddRange(_segment.Points);
|
|
}
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|
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public override Point GetPoint(int index)
|
|
{
|
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if (index < -1 || index > _segment.Points.Count - 1)
|
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throw new ArgumentOutOfRangeException(nameof(index));
|
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if (index != -1) return _segment.Points[index];
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|
return _segment.Points.Last();
|
|
}
|
|
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public override IEnumerable<SimpleSegment> GetSimpleSegments()
|
|
{
|
|
var start = Start;
|
|
// ReSharper disable once GenericEnumeratorNotDisposed
|
|
var enumerator = _segment.Points.GetEnumerator();
|
|
while (enumerator.MoveNext())
|
|
{
|
|
var current = enumerator.Current;
|
|
yield return SimpleSegment.Create(start, current);
|
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start = current;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
private class PolyQuadraticBezierSegmentImplementation : PathSegmentImplementation
|
|
{
|
|
private PolyQuadraticBezierSegment _segment;
|
|
|
|
public override PathSegment ApplyTransform(GeneralTransform transform)
|
|
{
|
|
_segment.Points.ApplyTransform(transform);
|
|
return _segment;
|
|
}
|
|
|
|
public static PathSegmentImplementation Create(PolyQuadraticBezierSegment source)
|
|
{
|
|
if (source != null) return new PolyQuadraticBezierSegmentImplementation {_segment = source};
|
|
return null;
|
|
}
|
|
|
|
public override void Flatten(IList<Point> points, double tolerance)
|
|
{
|
|
var start = Start;
|
|
var num = _segment.Points.Count / 2 * 2;
|
|
for (var i = 0; i < num; i += 2)
|
|
{
|
|
Point[] controlPoints = {start, _segment.Points[i], _segment.Points[i + 1]};
|
|
var resultPolyline = new List<Point>();
|
|
BezierCurveFlattener.FlattenQuadratic(controlPoints, tolerance, resultPolyline, true);
|
|
points.AddRange(resultPolyline);
|
|
start = _segment.Points[i + 1];
|
|
}
|
|
}
|
|
|
|
public override Point GetPoint(int index)
|
|
{
|
|
var num = _segment.Points.Count / 2 * 2;
|
|
if (index < -1 || index > num - 1) throw new ArgumentOutOfRangeException(nameof(index));
|
|
if (index != -1) return _segment.Points[index];
|
|
return _segment.Points[num - 1];
|
|
}
|
|
|
|
public override IEnumerable<SimpleSegment> GetSimpleSegments()
|
|
{
|
|
var start = Start;
|
|
IList<Point> points = _segment.Points;
|
|
var iteratorVariable2 = _segment.Points.Count / 2;
|
|
var iteratorVariable3 = 0;
|
|
while (true)
|
|
{
|
|
if (iteratorVariable3 >= iteratorVariable2) yield break;
|
|
var iteratorVariable4 = iteratorVariable3 * 2;
|
|
yield return SimpleSegment.Create(start, points[iteratorVariable4],
|
|
points[iteratorVariable4 + 1]);
|
|
start = points[iteratorVariable4 + 1];
|
|
iteratorVariable3++;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
private class QuadraticBezierSegmentImplementation : PathSegmentImplementation
|
|
{
|
|
private QuadraticBezierSegment _segment;
|
|
|
|
public override PathSegment ApplyTransform(GeneralTransform transform)
|
|
{
|
|
_segment.Point1 = transform.Transform(_segment.Point1);
|
|
_segment.Point2 = transform.Transform(_segment.Point2);
|
|
return _segment;
|
|
}
|
|
|
|
public static PathSegmentImplementation Create(QuadraticBezierSegment source)
|
|
{
|
|
if (source != null) return new QuadraticBezierSegmentImplementation {_segment = source};
|
|
return null;
|
|
}
|
|
|
|
public override void Flatten(IList<Point> points, double tolerance)
|
|
{
|
|
Point[] controlPoints = {Start, _segment.Point1, _segment.Point2};
|
|
var resultPolyline = new List<Point>();
|
|
BezierCurveFlattener.FlattenQuadratic(controlPoints, tolerance, resultPolyline, true);
|
|
points.AddRange(resultPolyline);
|
|
}
|
|
|
|
public override Point GetPoint(int index)
|
|
{
|
|
if (index < -1 || index > 1) throw new ArgumentOutOfRangeException(nameof(index));
|
|
return index == 0 ? _segment.Point1 : _segment.Point2;
|
|
}
|
|
|
|
public override IEnumerable<SimpleSegment> GetSimpleSegments()
|
|
{
|
|
yield return SimpleSegment.Create(Start, _segment.Point1, _segment.Point2);
|
|
}
|
|
}
|
|
}
|
|
} |