MARKUS

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows;

using System.Windows.Media;

namespace MarkupToPDF.Controls.Common

{

    class DrawSet

    {

        /// <summary>

        /// draw a arrow with given two points

        /// </summary>

        /// <param name="p2"></param>

        /// <param name="p1"></param>

        /// <param name="lineSize"></param>

        /// <returns></returns>

        public static PathGeometry DrawArrow(Point p2, Point p1, double lineSize)

        {

            double theta = Math.Atan2((p2.Y - p1.Y), (p2.X - p1.X)) * 180 / Math.PI;

            PathGeometry pathGeometry = new PathGeometry();

            PathFigure pathFigure = new PathFigure();

            pathFigure.StartPoint = p1;

            Point lpoint = new Point(p1.X + lineSize * 2, p1.Y + lineSize * 6);

            Point rpoint = new Point(p1.X - lineSize * 2, p1.Y + lineSize * 6);

            List<Point> points = new List<Point>() { lpoint, rpoint, p1 };

            PolyLineSegment polyline = new PolyLineSegment(points, true);

            pathFigure.Segments.Add(polyline);

            pathFigure.IsClosed = true;

            pathFigure.IsFilled = true;

            pathGeometry.Figures.Add(pathFigure);

            pathGeometry.FillRule = FillRule.Nonzero;

            RotateTransform transform = new RotateTransform();

            transform.Angle = theta - 90;

            transform.CenterX = p1.X;

            transform.CenterY = p1.Y;

            pathGeometry.Transform = transform;

            return pathGeometry;

        }

    }

}