CraftSynth.ImageEditor – Rev 1

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

namespace CraftSynth.ImageEditor
{
        /// <summary>
        /// Scribble tool
        /// </summary>
        internal class ToolPolygon : ToolObject
        {
                public ToolPolygon()
                {
                        Cursor = new Cursor(GetType(), "Pencil.cur");
                }

                private int lastX;
                private int lastY;
                private DrawPolygon newPolygon;
                private int minDistance = 15 * 15;

                /// <summary>
                /// Left nouse button is pressed
                /// </summary>
                /// <param name="drawArea"></param>
                /// <param name="e"></param>
                public override void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
                {
                        // Create new polygon, add it to the list
                        // and keep reference to it
                        Point p = drawArea.BackTrackMouse(new Point(e.X, e.Y));
                        
                                newPolygon = new DrawPolygon(p.X, p.Y, p.X + 1, p.Y + 1, drawArea.LineColor, drawArea.LineWidth, drawArea.PenType, drawArea.EndCap);
                        
                        // Set the minimum distance variable according to current zoom level.
                        minDistance = Convert.ToInt32((15 * drawArea.Zoom) * (15 * drawArea.Zoom));

                        AddNewObject(drawArea, newPolygon);
                        lastX = e.X;
                        lastY = e.Y;
                }

                /// <summary>
                /// Mouse move - resize new polygon
                /// </summary>
                /// <param name="drawArea"></param>
                /// <param name="e"></param>
                public override void OnMouseMove(DrawArea drawArea, MouseEventArgs e)
                {
                        drawArea.Cursor = Cursor;

                        if (e.Button !=
                            MouseButtons.Left)
                                return;

                        if (newPolygon == null)
                                return; // precaution

                        Point point = drawArea.BackTrackMouse(new Point(e.X, e.Y));
                        int distance = (e.X - lastX) * (e.X - lastX) + (e.Y - lastY) * (e.Y - lastY);

                        if (distance < minDistance)
                        {
                                // Distance between last two points is less than minimum -
                                // move last point
                                newPolygon.MoveHandleTo(point, newPolygon.HandleCount);
                        }
                        else
                        {
                                // Add new point
                                newPolygon.AddPoint(point);
                                lastX = e.X;
                                lastY = e.Y;
                        }
                        drawArea.Refresh();
                }

                public override void OnMouseUp(DrawArea drawArea, MouseEventArgs e)
                {
                        newPolygon = null;
                        base.OnMouseUp(drawArea, e);
                }

                #region Destruction
                private bool _disposed = false;

                protected override void Dispose(bool disposing)
                {
                        if (!this._disposed)
                        {
                                if (disposing)
                                {
                                        // Free any managed objects here. 
                                        if (this.newPolygon != null)
                                        {
                                                this.newPolygon.Dispose();
                                        }
                                }

                                // Free any unmanaged objects here. 
                                
                                this._disposed = true;
                        }
                        base.Dispose(disposing);
                }

                ~ToolPolygon()
                {
                         this.Dispose(false);
                }
                #endregion
        }
}

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