DrawToolsRedux/ToolPolyLine.cs

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

namespace DrawTools
{
	/// <summary>
	/// PolyLine tool (a PolyLine is a series of connected straight lines where each line is drawn individually)
	/// </summary>
	internal class ToolPolyLine : ToolObject
	{
		public ToolPolyLine()
		{
			Cursor = new Cursor(GetType(), "Pencil.cur");
		}

		private DrawPolyLine newPolyLine;
		private bool _drawingInProcess = false; // Set to true when drawing

		/// <summary>
		/// Left nouse 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;
				newPolyLine = null;
			}
			else
			{
				Point p = drawArea.BackTrackMouse(new Point(e.X, e.Y));
				if (drawArea.PenType ==
				    DrawingPens.PenType.Generic)
				{
					if (_drawingInProcess == false)
					{
						newPolyLine = new DrawPolyLine(p.X, p.Y, p.X + 1, p.Y + 1, drawArea.LineColor, drawArea.LineWidth);
						newPolyLine.EndPoint = new Point(p.X + 1, p.Y + 1);
						AddNewObject(drawArea, newPolyLine);
						_drawingInProcess = true;
					}
					else
					{
						// Drawing is in process, so simply add a new point
						newPolyLine.AddPoint(p);
						newPolyLine.EndPoint = p;
					}
				}
				else
				{
					if (_drawingInProcess == false)
					{
						newPolyLine = new DrawPolyLine(p.X, p.Y, p.X + 1, p.Y + 1, drawArea.PenType);
						newPolyLine.EndPoint = new Point(p.X + 1, p.Y + 1);
						AddNewObject(drawArea, newPolyLine);
						_drawingInProcess = true;
					}