LIBMAS/Annotation/Label/DrawOneArrowLine.cs

using PaintDotNet.Annotation.Enum;
using PaintDotNet.Base.SettingModel;

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Globalization;
using System.Runtime.Serialization;
using System.Windows.Forms;

namespace PaintDotNet.Annotation.Label
{
    /// <summary>
    /// 标注->箭头->单向箭头
    /// </summary>
    public class DrawOneArrowLine : DrawObject
    {
        private AdjustableArrowCap lineCap = new AdjustableArrowCap(6, 6, true);

        private const string entryStart = "Start";
        private const string entryEnd = "End";

        /// <summary>
        ///  Graphic objects for hit test
        /// </summary>
        private GraphicsPath areaPath = null;
        private Pen areaPen = null;
        private Region areaRegion = null;

        /// <summary>
        /// 标注样式信息model
        /// </summary>
        private LabelStyleModel.OneWayArrow labelOneArrowStyleModel;

        public LabelStyleModel.OneWayArrow LabelOneArrowStyleModel
        {
            set
            {
                this.labelOneArrowStyleModel = value;
            }
        }


        public DrawOneArrowLine(ISurfaceBox surfaceBox, int x1, int y1, int x2, int y2) : base()
        {
            this.objectType = DrawClass.Label;
            this.drawToolType = DrawToolType.DrawOneArrowLine;

            this.labelOneArrowStyleModel = surfaceBox.GetLabelStyleModel().oneWayArrowModel;
            startPoint.X = x1;
            startPoint.Y = y1;
            endPoint.X = x2;
            endPoint.Y = y2;

            Initialize();
        }

        public DrawOneArrowLine(ISurfaceBox surfaceBox, List<PointF> points, ParentStyleModel parentStyleModel, Object content) : base()
        {
            this.objectType = DrawClass.Label;
            this.drawToolType = DrawToolType.DrawOneArrowLine;
            this.ISurfaceBox = surfaceBox;

            labelOneArrowStyleModel = (LabelStyleModel.OneWayArrow)parentStyleModel;
            startPoint.X = points[0].X;
            startPoint.Y = points[0].Y;
            endPoint.X = points[1].X;
            endPoint.Y = points[1].Y;
        }

        /// <summary>
        /// Clone this instance
        /// </summary>
        public override DrawObject Clone()
        {
            DrawOneArrowLine drawOneArrowLine = new DrawOneArrowLine(this.ISurfaceBox,0,0,0,0);
            drawOneArrowLine.objectType = DrawClass.Label;
            drawOneArrowLine.drawToolType = DrawToolType.DrawOneArrowLine;
            drawOneArrowLine.ISurfaceBox = this.ISurfaceBox;
            drawOneArrowLine.startPoint = this.startPoint;
            drawOneArrowLine.endPoint = this.endPoint;
            FillDrawObjectFields(drawOneArrowLine);
            return drawOneArrowLine;
        }

        public override DrawObject Clone(ISurfaceBox surfaceBox)
        {
            DrawOneArrowLine drawOneArrowLine = new DrawOneArrowLine(surfaceBox, 0, 0, 0, 0);
            drawOneArrowLine.objectType = DrawClass.Label;
            drawOneArrowLine.drawToolType = DrawToolType.DrawOneArrowLine;
            drawOneArrowLine.ISurfaceBox = surfaceBox;
            drawOneArrowLine.startPoint = this.startPoint;
            drawOneArrowLine.endPoint = this.endPoint;
            drawOneArrowLine.labelOneArrowStyleModel = this.labelOneArrowStyleModel;
            FillDrawObjectFields(drawOneArrowLine);
            return drawOneArrowLine;
        }

        public override void Draw(Graphics g)
        {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            Color color = Color.FromArgb(this.labelOneArrowStyleModel.lineColor); 
            Pen pen = new Pen(color, this.labelOneArrowStyleModel.lineWidth);
            pen.DashStyle = (DashStyle)this.labelOneArrowStyleModel.lineStyle;
            pen.CustomEndCap = lineCap;
            g.DrawLine(pen, startPoint.X, startPoint.Y, endPoint.X, endPoint.Y);
            pen.Dispose();
        }

        public override int HandleCount
        {
            get
            {
                return 2;
            }
        }

        /// <summary>
        /// Get handle pointscroll by 1-based number
        /// </summary>
        /// <param name="handleNumber"></param>
        /// <returns></returns>
        public override PointF GetHandle(int handleNumber)
        {
            if (handleNumber == 1)
                return startPoint;
            else
                return endPoint;
        }

        /// <summary>
        /// Hit test.
        /// Return value: -1 - no hit
        ///                0 - hit anywhere
        ///                > 1 - handle number
        /// </summary>
        /// <param name="pointscroll"></param>
        /// <returns></returns>
        public override int HitTest(Point point)
        {
            if (Selected)
            {
                for (int i = 1; i <= HandleCount; i++)
                {
                    if (GetHandleRectangle(i).Contains(point))
                        return i;
                }
            }

            if (PointInObject(point))
                return 0;

            return -1;
        }

        protected override bool PointInObject(Point point)
        {
            CreateObjects();

            return AreaRegion.IsVisible(point);
        }

        public override bool IntersectsWith(Rectangle rectangle)
        {
            CreateObjects();

            return AreaRegion.IsVisible(rectangle);
        }

        public override Cursor GetHandleCursor(int handleNumber)
        {
            switch (handleNumber)
            {
                case 1:
                case 2:
                    return Cursors.SizeAll;
                default:
                    return Cursors.Default;
            }
        }

        public override void MoveHandleTo(Point point, int handleNumber)
        {
            if (handleNumber == 1)
                startPoint = point;
            else
                endPoint = point;

            Invalidate();
        }

        public override void Move(int deltaX, int deltaY)
        {
            int x = ISurfaceBox.UnscaleScalar(deltaX);
            int y = ISurfaceBox.UnscaleScalar(deltaY);

            startPoint.X += x;
            startPoint.Y += y;

            endPoint.X += x;
            endPoint.Y += y;

            Invalidate();
        }

        public override void SaveToStream(System.Runtime.Serialization.SerializationInfo info, int orderNumber)
        {
            info.AddValue(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryStart, orderNumber),
                startPoint);

            info.AddValue(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryEnd, orderNumber),
                endPoint);

            base.SaveToStream(info, orderNumber);
        }

        public override void LoadFromStream(SerializationInfo info, int orderNumber)
        {
            startPoint = (Point)info.GetValue(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryStart, orderNumber),
                typeof(Point));

            endPoint = (Point)info.GetValue(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryEnd, orderNumber),
                typeof(Point));

            base.LoadFromStream(info, orderNumber);
        }


        /// <summary>
        /// Invalidate object.
        /// When object is invalidated, path used for hit test
        /// is released and should be created again.
        /// </summary>
        protected void Invalidate()
        {
            if (AreaPath != null)
            {
                AreaPath.Dispose();
                AreaPath = null;
            }

            if (AreaPen != null)
            {
                AreaPen.Dispose();
                AreaPen = null;
            }

            if (AreaRegion != null)
            {
                AreaRegion.Dispose();
                AreaRegion = null;
            }
        }

        /// <summary>
        /// Create graphic objects used from hit test.
        /// </summary>
        protected virtual void CreateObjects()
        {
            if (AreaPath != null)
                return;

            // Create path which contains wide line
            // for easy mouse selection
            AreaPath = new GraphicsPath();
            AreaPen = new Pen(Color.Black, 7);
            AreaPath.AddLine(startPoint.X-1, startPoint.Y-1, endPoint.X+1, endPoint.Y+1);
            AreaPath.Widen(AreaPen);

            // Create region from the path
            AreaRegion = new Region(AreaPath);
        }

        protected GraphicsPath AreaPath
        {
            get
            {
                return areaPath;
            }
            set
            {
                areaPath = value;
            }
        }

        protected Pen AreaPen
        {
            get
            {
                return areaPen;
            }
            set
            {
                areaPen = value;
            }
        }

        protected Region AreaRegion
        {
            get
            {
                return areaRegion;
            }
            set
            {
                areaRegion = value;
            }
        }

        public override RectangleF GetBoundingBox()
        {
            RectangleF rectangle = GetNotmalizedRectangle(startPoint, endPoint);

            return rectangle;
        }

        public static RectangleF GetNotmalizedRectangle(PointF a, PointF b)
        {
            RectangleF rect = new RectangleF();
            if (a.X < b.X)
            {
                rect.X = a.X;
                rect.Width = b.X - a.X;
            }
            else
            {
                rect.X = b.X;
                rect.Width = a.X - b.X;
            }

            if (a.Y < b.Y)
            {
                rect.Y = a.Y;
                rect.Height = b.Y - a.Y;
            }
            else
            {
                rect.Y = b.Y;
                rect.Height = a.Y - b.Y;
            }

            return rect;
        }

        /// <summary>
        /// Draw tracker for selected object
        /// </summary>
        /// <param name="g"></param>
        public override void DrawTracker(Graphics g)
        {
            if (!Selected)
                return;

            SolidBrush brush = new SolidBrush(Color.Black);
            for (int i = 1; i <= HandleCount; i++)
            {
                g.FillRectangle(brush, GetHandleRectangle(i));
            }
            brush.Dispose();
        }

        public override List<PointF> GetPoints()
        {
            List<PointF> points = new List<PointF>();
            points.Add(startPoint);
            points.Add(endPoint);
            return points;
        }

        public override ParentStyleModel GetStyle()
        {
            return labelOneArrowStyleModel;
        }
    }
}