DrawToolsRedux/ToolConnector.cs

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using System.Drawing;
using System.Windows.Forms;

namespace DrawTools
{
	/// <summary>
	/// Connector tool (a Connector is a series of connected straight lines where each line is drawn individually and at least one of the ends is anchored to another object)
	/// </summary>
	internal class ToolConnector : ToolObject
	{
		public ToolConnector()
		{
			Cursor = new Cursor(GetType(), "Pencil.cur");
		}

		private DrawConnector newConnector;
		private bool _drawingInProcess = false; // Set to true when drawing

		/// <summary>
		/// Left mouse button is pressed
		/// </summary>
		/// <param name="drawArea"></param>
		/// <param name="e"></param>
		public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
		{
			if (e.Button == MouseButtons.Right)
			{
				_drawingInProcess = false;
				newConnector = null;
			} else
			{
				Point p = drawArea.BackTrackMouse(new Point(e.X, e.Y));
				int objectID = -1;
				p = TestForConnection(drawArea, p, out objectID);
				if (drawArea.PenType == DrawingPens.PenType.Generic)
				{
					if (_drawingInProcess == false)
					{
						newConnector = new DrawConnector(p.X, p.Y, p.X + 1, p.Y + 1, drawArea.LineColor, drawArea.LineWidth);
						newConnector.EndPoint = new Point(p.X + 1, p.Y + 1);
						if (objectID > -1)
						{
							newConnector.StartIsAnchored = true;
							newConnector.StartObjectId = objectID;
						}
						AddNewObject(drawArea, newConnector);
						_drawingInProcess = true;
					} else
					{
						// Drawing is in process, so simply add a new point
						newConnector.AddPoint(p);
						newConnector.EndPoint = p;
						if (objectID > -1)
						{
							newConnector.EndIsAnchored = true;
							newConnector.EndObjectId = objectID;
							_drawingInProcess = false;
						}
					}
				} else