[2768] | 1 | using System;
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| 2 | using System.Drawing;
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| 3 | using System.Drawing.Drawing2D;
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[5485] | 4 | namespace Netron.Diagramming.Core {
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| 5 | /// <summary>
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| 6 | /// Represents the connection between two connectors
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| 7 | /// </summary>
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| 8 | public sealed partial class Connection : ConnectionBase {
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[2768] | 9 |
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| 10 |
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[5485] | 11 | // ------------------------------------------------------------------
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| 12 | /// <summary>
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| 13 | /// Implementation of IVersion - the current version of
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| 14 | /// Connection.
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| 15 | /// </summary>
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| 16 | // ------------------------------------------------------------------
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| 17 | private const double connectionVersion = 1.0;
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[2768] | 18 |
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[5485] | 19 | #region Hack for the caps
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| 20 | private const float capslength = 0.01F;
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| 21 | private const float standardsshift = 7F;
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| 22 | private const float arrowshift = 0.1F;
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| 23 | /// <summary>
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| 24 | /// the ration between the arrow width to the line width
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| 25 | /// </summary>
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| 26 | private const float capsratio = 5.5F;
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| 27 | private const float generalizationration = 2.2F;
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| 28 | private float capsshift;
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| 29 | private Pen leftPen;
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| 30 | private Pen rightPen;
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| 31 | private PointF unitvector;
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[2768] | 32 |
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[5485] | 33 | #endregion
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[2768] | 34 |
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[5485] | 35 | #region Properties
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[2768] | 36 |
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[5485] | 37 | // ------------------------------------------------------------------
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| 38 | /// <summary>
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| 39 | /// Gets the current version.
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| 40 | /// </summary>
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| 41 | // ------------------------------------------------------------------
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| 42 | public override double Version {
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| 43 | get {
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| 44 | return connectionVersion;
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| 45 | }
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| 46 | }
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| 47 |
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| 48 | /// <summary>
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| 49 | /// Gets the friendly name of the entity to be displayed in the UI
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| 50 | /// </summary>
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| 51 | /// <value></value>
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| 52 | public override string EntityName {
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| 53 | get { return "Default Connection"; }
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| 54 | }
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| 55 | /// <summary>
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| 56 | /// The bounds of the paintable entity
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| 57 | /// </summary>
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| 58 | /// <value></value>
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| 59 | public override Rectangle Rectangle {
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| 60 | get {
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| 61 | if ((From == null) || (To == null)) {
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| 62 | return Rectangle.Empty;
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[2768] | 63 | }
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[5485] | 64 | return Rectangle.FromLTRB(
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| 65 | Math.Min(From.Point.X, To.Point.X),
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| 66 | Math.Min(From.Point.Y, To.Point.Y),
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| 67 | Math.Max(From.Point.X, To.Point.X),
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| 68 | Math.Max(From.Point.Y, To.Point.Y));
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| 69 | }
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| 70 | }
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[2768] | 71 |
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[5485] | 72 | #endregion
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[2768] | 73 |
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[5485] | 74 | #region Constructor
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[2768] | 75 |
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[5485] | 76 | /// <summary>
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| 77 | /// Constructs a connection between the two given points
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| 78 | /// </summary>
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| 79 | /// <param name="mFrom">the starting point of the connection</param>
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| 80 | /// <param name="mTo">the end-point of the connection</param>
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| 81 | /// <param name="model">The model.</param>
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| 82 | public Connection(Point mFrom, Point mTo, IModel model)
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| 83 | : base(model) {
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| 84 | this.From = new Connector(mFrom, model);
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| 85 | this.From.Name = "From";
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| 86 | this.From.Parent = this;
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| 87 | this.To = new Connector(mTo, model);
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| 88 | this.To.Name = "To";
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| 89 | this.To.Parent = this;
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| 90 | PenStyle = ArtPalette.GetDefaultPenStyle();
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| 91 | }
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[2768] | 92 |
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[5485] | 93 | /// <summary>
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| 94 | /// Initializes a new instance of the <see cref="T:Connection"/> class.
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| 95 | /// </summary>
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| 96 | /// <param name="from">From.</param>
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| 97 | /// <param name="to">To.</param>
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| 98 | public Connection(Point from, Point to)
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| 99 | : base(from, to) {
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| 100 | }
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[2768] | 101 |
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[5485] | 102 | public Connection()
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| 103 | : base(new Point(10, 10), new Point(20, 20)) {
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[2768] | 104 |
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[5485] | 105 | }
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| 106 | #endregion
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[2768] | 107 |
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[5485] | 108 | #region Methods
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[2768] | 109 |
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[5485] | 110 | /// <summary>
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| 111 | /// Paints the connection on the canvas.
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| 112 | /// </summary>
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| 113 | /// <param name="g"></param>
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| 114 | public override void Paint(Graphics g) {
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| 115 | g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
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| 116 | base.Paint(g);
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[2768] | 117 |
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[5485] | 118 | if (Hovered) {
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| 119 | g.DrawLine(ArtPalette.HighlightPen, From.Point, To.Point);
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| 120 | } else {
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| 121 | g.DrawLine(mPenStyle.DrawingPen(), From.Point, To.Point);
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| 122 | }
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[2768] | 123 |
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[5485] | 124 | if (ArtPalette.EnableShadows)
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| 125 | g.DrawLine(ArtPalette.ConnectionShadow, From.Point.X + 5, From.Point.Y + 5, To.Point.X + 5, To.Point.Y + 5);
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[2768] | 126 |
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[5485] | 127 | if (leftPen != null) {
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| 128 | g.DrawLine(leftPen, From.Point.X + capsshift * unitvector.X, From.Point.Y + capsshift * unitvector.Y, From.Point.X + (capsshift + capslength) * unitvector.X, From.Point.Y + (capsshift + capslength) * unitvector.Y);
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| 129 | }
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| 130 | if (rightPen != null) {
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| 131 | g.DrawLine(rightPen, To.Point.X - (capsshift + capslength) * unitvector.X, To.Point.Y - (capsshift + capslength) * unitvector.Y, To.Point.X - capsshift * unitvector.X, To.Point.Y - capsshift * unitvector.Y);
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| 132 | }
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| 133 | }
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| 134 | /// <summary>
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| 135 | /// Invalidates the connection
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| 136 | /// </summary>
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| 137 | public override void Invalidate() {
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[2768] | 138 |
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[5485] | 139 | float x = 0, y = 0;
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| 140 | try {
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| 141 | if (To == null || From == null) return;
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| 142 | double length = Math.Sqrt((To.Point.X - From.Point.X) * (To.Point.X - From.Point.X) + (To.Point.Y - From.Point.Y) * (To.Point.Y - From.Point.Y));
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| 143 | x = Convert.ToSingle(Convert.ToDouble(To.Point.X - From.Point.X) / length);
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| 144 | y = Convert.ToSingle(Convert.ToDouble(To.Point.Y - From.Point.Y) / length);
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| 145 | }
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| 146 | catch (OverflowException exc) {
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| 147 | throw new InconsistencyException("So, you tried to shrink the connection too much...", exc);
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| 148 | }
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| 149 | unitvector = new PointF(x, y);
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| 150 | /* the old way
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| 151 | Rectangle f = new Rectangle(From.Point,new Size(10,10));
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| 152 | Rectangle t = new Rectangle(To.Point,new Size(10,10));
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| 153 | this.Invalidate(Rectangle.Union(f,t));
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| 154 | */
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| 155 | base.Invalidate();
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[2768] | 156 |
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[5485] | 157 | }
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| 158 |
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| 159 | /// <summary>
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| 160 | /// Tests if the mouse hits this connection
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| 161 | /// </summary>
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| 162 | /// <param name="p"></param>
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| 163 | /// <returns></returns>
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| 164 | public override bool Hit(Point p) {
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| 165 | Point p1, p2, s;
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| 166 | RectangleF r1, r2;
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| 167 | p1 = From.Point; p2 = To.Point;
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| 168 |
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| 169 | // p1 must be the leftmost point.
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| 170 | if (p1.X > p2.X) { s = p2; p2 = p1; p1 = s; }
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| 171 |
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| 172 | r1 = new RectangleF(p1.X, p1.Y, 0, 0);
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| 173 | r2 = new RectangleF(p2.X, p2.Y, 0, 0);
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| 174 | r1.Inflate(3, 3);
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| 175 | r2.Inflate(3, 3);
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| 176 | if (RectangleF.Union(r1, r2).Contains(p)) {
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[3175] | 177 | PointF connectionVector = new PointF(p2.X - p1.X, p2.Y - p1.Y);
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| 178 | PointF normalVector = new PointF(connectionVector.Y, connectionVector.X * -1);
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| 179 | PointF pointVector = new PointF(p.X - p1.X, p.Y - p1.Y);
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| 180 |
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| 181 | double normalVectorLength = Math.Sqrt(normalVector.X * normalVector.X + normalVector.Y * normalVector.Y);
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| 182 | double distance = Math.Abs(pointVector.X * normalVector.X + pointVector.Y * normalVector.Y) / normalVectorLength;
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| 183 |
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| 184 | return distance < 5;
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[5485] | 185 | }
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| 186 | return false;
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| 187 | }
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[2768] | 188 |
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[5485] | 189 | /// <summary>
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| 190 | /// Moves the connection with the given shift
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| 191 | /// </summary>
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| 192 | /// <param name="p"></param>
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| 193 | public override void MoveBy(Point p) {
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| 194 | if (From.AttachedTo != null || To.AttachedTo != null) return;
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[2768] | 195 |
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[5485] | 196 | Rectangle rec = this.Rectangle;
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| 197 | rec.Inflate(20, 20);
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| 198 | this.From.MoveBy(p);
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| 199 | this.To.MoveBy(p);
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| 200 | this.Invalidate();
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| 201 | this.Invalidate(rec);
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| 202 | }
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| 203 | /// <summary>
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| 204 | /// Updates pens and brushes.
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| 205 | /// <remarks>The .Net API allows you to simply set caps but the visual results are less than satisfactory, to say the least. So, there is
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| 206 | /// a hack here (unfortunately) which amounts to use two pen for one connection; one pen for the line and one for the (custom) cap. This is
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| 207 | /// the easiest way to have visible arrow which otherwise is miniaturistic. There is also a custom shift of the caps since the location is sometime
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| 208 | /// inappropriate; the arrow is drawn with the tip at the end of the connection while the diamond or circle caps are drawn with their center at the connection
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| 209 | /// end. So, altogether a lot of tweaking and I really find it regrettable that the out-of-the-box caps are not what they should be (besides some obvious bugs like
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| 210 | /// the 'not implemented' one if you try to fill a custom cap...).
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| 211 | /// </remarks>
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| 212 | /// </summary>
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| 213 | protected override void UpdatePaintingMaterial() {
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| 214 | base.UpdatePaintingMaterial();
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| 215 | #region Hack
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| 216 | //see the code comments of the LinePenStyle to understand the problem and this hack
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| 217 | if (this.PenStyle is LinePenStyle) {
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[2768] | 218 |
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[5485] | 219 | LinePenStyle lp = PenStyle as LinePenStyle;
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| 220 | if (lp.StartCap == System.Drawing.Drawing2D.LineCap.NoAnchor) {
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| 221 | leftPen = null;
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| 222 | } else {
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[2768] | 223 |
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| 224 |
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[5485] | 225 | if (lp.StartCap == System.Drawing.Drawing2D.LineCap.Custom) {
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| 226 | //leftPen.StartCap = System.Drawing.Drawing2D.LineCap.Custom;
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| 227 | //AdjustableArrowCap ccap = new AdjustableArrowCap(lp.Width+2, lp.Width+2, true);
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| 228 | //leftPen.CustomStartCap = ccap;
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| 229 | leftPen = new Pen(lp.Color, lp.Width * generalizationration);
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| 230 | leftPen.CustomStartCap = LinePenStyle.GenerallizationCap; //change to something like lp.CustomStartCap if you have more than one custom cap
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| 231 | capsshift = standardsshift;
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| 232 | } else if (lp.StartCap == LineCap.ArrowAnchor) {
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| 233 | leftPen = new Pen(lp.Color, lp.Width * capsratio);
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| 234 | leftPen.StartCap = lp.StartCap;
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| 235 | capsshift = arrowshift;
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| 236 | } else {
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| 237 | leftPen = new Pen(lp.Color, lp.Width * capsratio);
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| 238 | leftPen.StartCap = lp.StartCap;
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| 239 | capsshift = standardsshift;
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| 240 | }
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| 241 | }
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[2768] | 242 |
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[5485] | 243 | if (lp.EndCap == System.Drawing.Drawing2D.LineCap.NoAnchor) {
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| 244 | rightPen = null;
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| 245 | } else {
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[2768] | 246 |
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[5485] | 247 | if (lp.EndCap == System.Drawing.Drawing2D.LineCap.Custom) {
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| 248 | //leftPen.StartCap = System.Drawing.Drawing2D.LineCap.Custom;
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| 249 | //AdjustableArrowCap ccap = new AdjustableArrowCap(lp.Width+2, lp.Width+2, true);
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| 250 | //leftPen.CustomStartCap = ccap;
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| 251 | //rightPen = new Pen(lp.Color, lp.Width * generalizationration);
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| 252 | //rightPen.CustomEndCap = lp.CustomEndCap;
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| 253 | //capsshift = standardsshift;
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| 254 | Pen.CustomEndCap = LinePenStyle.GenerallizationCap;
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| 255 | } else if (lp.EndCap == LineCap.ArrowAnchor) {
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| 256 | rightPen = new Pen(lp.Color, lp.Width * capsratio);
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| 257 | rightPen.EndCap = lp.EndCap;
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| 258 | capsshift = arrowshift;
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| 259 | } else {
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| 260 | rightPen = new Pen(lp.Color, lp.Width * capsratio);
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| 261 | rightPen.EndCap = lp.EndCap;
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| 262 | capsshift = standardsshift;
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| 263 | }
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| 264 | }
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[2768] | 265 |
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[5485] | 266 | }
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| 267 | #endregion
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| 268 | }
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| 269 |
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| 270 |
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| 271 |
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| 272 | #endregion
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| 273 |
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| 274 | }
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[2768] | 275 | }
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