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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows;
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using System.Windows.Ink;
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using System.Windows.Input;
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using System.Windows.Media;
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namespace InkCanvasForClass.IccInkCanvas {
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static class ToPointsHelper {
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public static Point[] ToPoints(this IEnumerable<StylusPoint> stylusPoints)
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{
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List<Point> pointList = new List<Point>();
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foreach (StylusPoint stylusPoint in stylusPoints)
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pointList.Add(stylusPoint.ToPoint());
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return pointList.ToArray();
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}
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}
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public enum ShapeDrawingType {
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Line,
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DottedLine,
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DashedLine,
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ArrowOneSide,
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ArrowTwoSide,
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Rectangle,
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Ellipse,
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PieEllipse,
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Triangle,
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RightTriangle,
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Diamond,
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Parallelogram,
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FourLine,
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Staff,
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Axis2D,
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Axis2DA,
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Axis2DB,
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Axis2DC,
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Axis3D,
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Hyperbola,
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HyperbolaF,
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Parabola,
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ParabolaA,
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ParabolaAF,
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Cylinder,
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Cube,
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Cone,
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EllipseC,
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RectangleC
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}
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public static class ShapeDrawingHelper {
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/// <summary>
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/// 根据给定的两个点计算角度
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/// </summary>
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/// <param name="firstPoint"></param>
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/// <param name="lastPoint"></param>
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/// <returns></returns>
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public static double CaculateRotateAngleByGivenTwoPoints(Point firstPoint, Point lastPoint) {
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var vec1 = new double[] {
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lastPoint.X - firstPoint.X ,
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lastPoint.Y - firstPoint.Y
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};
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var vec_base = new double[] { 0, firstPoint.Y };
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var cosine = (vec_base[0] * vec1[0] + vec_base[1] * vec1[1]) /
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(Math.Sqrt(Math.Pow(vec_base[0],2) + Math.Pow(vec_base[1],2)) *
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Math.Sqrt(Math.Pow(vec1[0],2) + Math.Pow(vec1[1],2)));
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var angle = Math.Acos(cosine);
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var isIn2And3Quadrant = lastPoint.X <= firstPoint.X;
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var rotateAngle = Math.Round(180 + 180 * (angle / Math.PI) * (isIn2And3Quadrant ? 1 : -1), 0);
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return rotateAngle;
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}
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public static List<Point> DistributePointsOnLine(Point start, Point end, double interval=16) {
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List<Point> points = new List<Point>();
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double dx = end.X - start.X;
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double dy = end.Y - start.Y;
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double distance = Math.Sqrt(dx * dx + dy * dy);
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int numPoints = (int)(distance / interval);
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for (int i = 0; i <= numPoints; i++) {
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double ratio = (interval * i) / distance;
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double x = start.X + ratio * dx;
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double y = start.Y + ratio * dy;
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points.Add(new Point(x, y));
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}
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return points;
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}
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public class ArrowLineConfig {
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public int ArrowWidth { get; set; } = 20;
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public int ArrowHeight { get; set; } = 7;
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}
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}
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public class IccStroke : Stroke {
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public IccStroke(StylusPointCollection stylusPoints, DrawingAttributes drawingAttributes)
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: base(stylusPoints, drawingAttributes) { }
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public static Guid StrokeShapeTypeGuid = new Guid("6537b29c-557f-487f-800b-cb30a8f1de78");
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public static Guid StrokeIsShapeGuid = new Guid("40eff5db-9346-4e42-bd46-7b0eb19d0018");
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public StylusPointCollection RawStylusPointCollection { get; set; }
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public ShapeDrawingHelper.ArrowLineConfig ArrowLineConfig { get; set; } =
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new ShapeDrawingHelper.ArrowLineConfig();
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/// <summary>
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/// 根据这个属性判断当前 Stroke 是否是原始输入
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/// </summary>
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public bool IsRawStylusPoints = true;
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/// <summary>
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/// 根据这个属性决定在绘制 Stroke 时是否需要在直线形状中，在两点构成直线上分布点，用于墨迹的范围框选。
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/// </summary>
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public bool IsDistributePointsOnLineShape = true;
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/// <summary>
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/// 指示该墨迹是否来自一个完整墨迹被擦除后的一部分墨迹，仅用于形状墨迹。
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/// </summary>
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public bool IsErasedStrokePart = false;
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// 自定义的墨迹渲染
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protected override void DrawCore(DrawingContext drawingContext,
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DrawingAttributes drawingAttributes) {
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if (!(this.ContainsPropertyData(StrokeIsShapeGuid) &&
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(bool)this.GetPropertyData(StrokeIsShapeGuid) == true)) {
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base.DrawCore(drawingContext, drawingAttributes);
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return;
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}
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if ((int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.DashedLine ||
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(int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.Line ||
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(int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.DottedLine ||
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(int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.ArrowOneSide ||
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(int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.ArrowTwoSide) {
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if (StylusPoints.Count < 2) {
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base.DrawCore(drawingContext, drawingAttributes);
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return;
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}
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var pts = new List<Point>(this.StylusPoints.ToPoints());
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if (IsDistributePointsOnLineShape && (
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(int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.DashedLine ||
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(int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.Line ||
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(int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.DottedLine) && IsRawStylusPoints) {
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IsRawStylusPoints = false;
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RawStylusPointCollection = StylusPoints.Clone();
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var pointList = new List<Point> { new Point(StylusPoints[0].X, StylusPoints[0].Y) };
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pointList.AddRange(ShapeDrawingHelper.DistributePointsOnLine(new Point(StylusPoints[0].X, StylusPoints[0].Y),new Point(StylusPoints[1].X, StylusPoints[1].Y)));
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pointList.Add(new Point(StylusPoints[1].X, StylusPoints[1].Y));
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StylusPoints = new StylusPointCollection(pointList);
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}
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StreamGeometry geometry = new StreamGeometry();
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using (StreamGeometryContext ctx = geometry.Open()) {
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ctx.BeginFigure(pts[0], false , false);
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pts.RemoveAt(0);
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ctx.PolyLineTo(pts,true, true);
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}
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var pen = new Pen(new SolidColorBrush(DrawingAttributes.Color),
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(drawingAttributes.Width + drawingAttributes.Height) / 2) {
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DashCap = PenLineCap.Round,
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StartLineCap = PenLineCap.Round,
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EndLineCap = PenLineCap.Round,
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};
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if ((int)this.GetPropertyData(StrokeShapeTypeGuid) != (int)ShapeDrawingType.Line &&
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(int)this.GetPropertyData(StrokeShapeTypeGuid) != (int)ShapeDrawingType.ArrowOneSide &&
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(int)this.GetPropertyData(StrokeShapeTypeGuid) != (int)ShapeDrawingType.ArrowTwoSide)
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pen.DashStyle = (int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.DottedLine ? DashStyles.Dot : DashStyles.Dash;
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if ((int)this.GetPropertyData(StrokeShapeTypeGuid) == (int)ShapeDrawingType.ArrowOneSide && IsRawStylusPoints) {
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IsRawStylusPoints = false;
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pts = new List<Point>(this.StylusPoints.ToPoints());
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RawStylusPointCollection = StylusPoints.Clone();
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double w = ArrowLineConfig.ArrowWidth, h = ArrowLineConfig.ArrowHeight;
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var theta = Math.Atan2(pts[0].Y - pts[1].Y, pts[0].X - pts[1].X);
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var sint = Math.Sin(theta);
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var cost = Math.Cos(theta);
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var pointList = new List<Point> {
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new Point(pts[0].X, pts[0].Y),
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};
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if (IsDistributePointsOnLineShape) pointList.AddRange(ShapeDrawingHelper.DistributePointsOnLine(new Point(pts[0].X, pts[0].Y),new Point(pts[1].X, pts[1].Y)));
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pointList.AddRange(new List<Point> {
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new Point(pts[1].X, pts[1].Y),
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new Point(pts[1].X + (w * cost - h * sint), pts[1].Y + (w * sint + h * cost)),
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new Point(pts[1].X, pts[1].Y),
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new Point(pts[1].X + (w * cost + h * sint), pts[1].Y - (h * cost - w * sint)),
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});
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StylusPoints = new StylusPointCollection(pointList);
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var _pts = new List<Point>(this.StylusPoints.ToPoints());
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using (StreamGeometryContext ctx = geometry.Open()) {
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ctx.BeginFigure(_pts[0], false , false);
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_pts.RemoveAt(0);
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ctx.PolyLineTo(_pts,true, true);
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}
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drawingContext.DrawGeometry(new SolidColorBrush(DrawingAttributes.Color),pen, geometry);
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return;
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}
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drawingContext.DrawGeometry(new SolidColorBrush(Colors.Transparent),pen, geometry);
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}
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}
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}
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}
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