Csharp/C Sharp/2D Graphics/Drag and Draw

Drag and Draw Demo

/*
GDI+ Programming in C# and VB .NET
by Nick Symmonds
Publisher: Apress
ISBN: 159059035X
*/
using System;
using System.IO;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace CustomWindow {
  /// <summary>
  /// </summary>
  public class CustomWindow1 : System.Windows.Forms.Form
  {
    private const int CLOSEDICON    = 0;
    private const int OPENICON      = 1;
    private const int DRAWICON      = 2;
    private const int DRAGICON      = 3;
    private ImageList     mImageList;
    private GraphicsPath  mOriginalPath;
    private GraphicsPath  mSmoothPath;
    private Point         mStartPoint;
    private Point         mLastPoint;
    private Rectangle     mInvalidRect;
    private Cursor        mDrawCursor;
    private Cursor        mDragCursor;
    private Icon          mDrawIcon;
    private string        mRecallFileName;
    private bool          mAllowDrawing;
    private bool          mDrawing;
    private bool          mDraging;

    private System.Windows.Forms.MainMenu mainMenu1;
    private System.Windows.Forms.MenuItem menuItem1;
    private System.Windows.Forms.MenuItem mnuExit;
    private System.Windows.Forms.MenuItem menuItem3;
    private System.Windows.Forms.MenuItem menuItem2;
    private System.Windows.Forms.MenuItem menuItem7;
    private System.Windows.Forms.RichTextBox DebugWindow;
    private System.Windows.Forms.MenuItem mnuCreate;
    private System.Windows.Forms.MenuItem mnuSmooth;
    private System.Windows.Forms.MenuItem mnuSaveShape;
    private System.Windows.Forms.MenuItem None;
    private System.Windows.Forms.MenuItem mnuSpawnForm;
    private System.Windows.Forms.MenuItem mnuSpawnSmooth;
    private System.Windows.Forms.Splitter PanelSplitter;
    private System.Windows.Forms.Panel BasePanel;
    private System.Windows.Forms.Panel P1;
    private System.Windows.Forms.TreeView PathTree;
    private System.Windows.Forms.Splitter TreeSplitter;

    private System.ruponentModel.Container components = null;
    public CustomWindow1()
    {
      InitializeComponent();
      //Initialize class variables
      mDrawIcon      = new Icon("draw.ico");
      mDrawCursor    = new Cursor("Pen.cur");
      mDragCursor    = new Cursor("drag.cur");
      mImageList    = new ImageList();
      mOriginalPath = new GraphicsPath();
      mSmoothPath   = new GraphicsPath();
      mDrawing     = false;
      mInvalidRect   = Rectangle.Empty;
      //Set the screen
      this.Icon   = mDrawIcon;
      this.Size = new Size(800, 600);
      this.SetStyle(ControlStyles.AllPaintingInWmPaint,true);
      this.SetStyle(ControlStyles.DoubleBuffer,true);
      //Set up the image list
      mImageList.Images.Add(new Icon("closed.ico"));
      mImageList.Images.Add(new Icon("open.ico"));
      mImageList.Images.Add(mDrawIcon);
      mImageList.Images.Add(new Icon("drag.ico"));
      //Set RichTextBox properties
      DebugWindow.ReadOnly    = true;
      DebugWindow.Height      = this.Height /8;
      DebugWindow.Text        = "";
      //Set up the splitters
      PanelSplitter.Height    = 3;
      PanelSplitter.BackColor = Color.Blue;
      TreeSplitter.BackColor  = Color.Blue;
      TreeSplitter.Location   = new Point(PathTree.Width, 0);
      TreeSplitter.Size       = new Size(3, this.Height);
      // Set properties of TreeView control.
      PathTree.Width          = this.ClientSize.Width / 6;
      PathTree.TabIndex       = 0;
      PathTree.ImageList      = mImageList;
      PathTree.MouseDown      += new MouseEventHandler(this.TreeMouseDown);
      PathTree.MouseMove      += new MouseEventHandler(this.TreeMouseMove);
      PathTree.AfterCollapse  += new  TreeViewEventHandler(
                                      this.TreeExpandCollapse);
      PathTree.AfterExpand    += new  TreeViewEventHandler(
                                      this.TreeExpandCollapse);
      //Set Drawing Panel Properties
      P1.BackColor    = Color.Bisque;
      P1.AllowDrop    = true;
      P1.DragEnter    += new DragEventHandler(this.PanelDragEnter);
      P1.DragDrop     += new DragEventHandler(this.PanelDragDrop);
      P1.Paint        += new PaintEventHandler(this.PanelPaint);
      P1.MouseDown    += new MouseEventHandler(this.M_Down);
      P1.MouseUp      += new MouseEventHandler(this.M_Up);
      P1.MouseMove    += new MouseEventHandler(this.M_Move);
      //Set all the border styles to none.
      BasePanel.BorderStyle   = BorderStyle.None;
      P1.BorderStyle          = BorderStyle.None;
      PathTree.BorderStyle    = BorderStyle.None;
      DebugWindow.BorderStyle = BorderStyle.None;
      //Disable some menu selections
      mnuSpawnForm.Enabled    = false;
      mnuSpawnSmooth.Enabled  = false;
    }
    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      mOriginalPath.Dispose();
      mSmoothPath.Dispose();
      base.Dispose( disposing );
    }
    #region Windows Form Designer generated code
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
      this.mainMenu1 = new System.Windows.Forms.MainMenu();
      this.menuItem1 = new System.Windows.Forms.MenuItem();
      this.mnuExit = new System.Windows.Forms.MenuItem();
      this.menuItem3 = new System.Windows.Forms.MenuItem();
      this.mnuCreate = new System.Windows.Forms.MenuItem();
      this.mnuSmooth = new System.Windows.Forms.MenuItem();
      this.menuItem2 = new System.Windows.Forms.MenuItem();
      this.mnuSaveShape = new System.Windows.Forms.MenuItem();
      this.menuItem7 = new System.Windows.Forms.MenuItem();
      this.None = new System.Windows.Forms.MenuItem();
      this.mnuSpawnForm = new System.Windows.Forms.MenuItem();
      this.mnuSpawnSmooth = new System.Windows.Forms.MenuItem();
      this.DebugWindow = new System.Windows.Forms.RichTextBox();
      this.PanelSplitter = new System.Windows.Forms.Splitter();
      this.BasePanel = new System.Windows.Forms.Panel();
      this.P1 = new System.Windows.Forms.Panel();
      this.PathTree = new System.Windows.Forms.TreeView();
      this.TreeSplitter = new System.Windows.Forms.Splitter();
      this.BasePanel.SuspendLayout();
      this.SuspendLayout();
      // 
      // mainMenu1
      // 
      this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                              this.menuItem1,
                                                                              this.menuItem3,
                                                                              this.menuItem7});
      // 
      // menuItem1
      // 
      this.menuItem1.Index = 0;
      this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                              this.mnuExit});
      this.menuItem1.Text = "&File";
      // 
      // mnuExit
      // 
      this.mnuExit.Index = 0;
      this.mnuExit.Text = "&Exit";
      this.mnuExit.Click += new System.EventHandler(this.mnuExit_Click);
      // 
      // menuItem3
      // 
      this.menuItem3.Index = 1;
      this.menuItem3.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                              this.mnuCreate,
                                                                              this.mnuSmooth,
                                                                              this.menuItem2,
                                                                              this.mnuSaveShape});
      this.menuItem3.Text = "&Shape";
      // 
      // mnuCreate
      // 
      this.mnuCreate.Index = 0;
      this.mnuCreate.Text = "Create";
      this.mnuCreate.Click += new System.EventHandler(this.mnuCreate_Click);
      // 
      // mnuSmooth
      // 
      this.mnuSmooth.Index = 1;
      this.mnuSmooth.Text = "Smooth";
      this.mnuSmooth.Click += new System.EventHandler(this.mnuSmooth_Click);
      // 
      // menuItem2
      // 
      this.menuItem2.Index = 2;
      this.menuItem2.Text = "-";
      // 
      // mnuSaveShape
      // 
      this.mnuSaveShape.Index = 3;
      this.mnuSaveShape.Text = "Save Shape";
      this.mnuSaveShape.Click += new System.EventHandler(this.mnuSaveShape_Click);
      // 
      // menuItem7
      // 
      this.menuItem7.Index = 2;
      this.menuItem7.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                              this.None});
      this.menuItem7.Text = "&Form";
      // 
      // None
      // 
      this.None.Index = 0;
      this.None.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {
                                                                         this.mnuSpawnForm,
                                                                         this.mnuSpawnSmooth});
      this.None.Text = "Spawn";
      this.None.Click += new System.EventHandler(this.mnuSpawnForm_Click);
      // 
      // mnuSpawnForm
      // 
      this.mnuSpawnForm.Index = 0;
      this.mnuSpawnForm.Text = "Original";
      this.mnuSpawnForm.Click += new System.EventHandler(this.mnuSpawnForm_Click);
      // 
      // mnuSpawnSmooth
      // 
      this.mnuSpawnSmooth.Index = 1;
      this.mnuSpawnSmooth.Text = "Smooth";
      this.mnuSpawnSmooth.Click += new System.EventHandler(this.mnuSpawnSmooth_Click);
      // 
      // DebugWindow
      // 
      this.DebugWindow.Dock = System.Windows.Forms.DockStyle.Bottom;
      this.DebugWindow.Location = new System.Drawing.Point(0, 321);
      this.DebugWindow.Name = "DebugWindow";
      this.DebugWindow.Size = new System.Drawing.Size(536, 40);
      this.DebugWindow.TabIndex = 3;
      this.DebugWindow.Text = "";
      // 
      // PanelSplitter
      // 
      this.PanelSplitter.Dock = System.Windows.Forms.DockStyle.Bottom;
      this.PanelSplitter.Location = new System.Drawing.Point(0, 313);
      this.PanelSplitter.Name = "PanelSplitter";
      this.PanelSplitter.Size = new System.Drawing.Size(536, 8);
      this.PanelSplitter.TabIndex = 4;
      this.PanelSplitter.TabStop = false;
      // 
      // BasePanel
      // 
      this.BasePanel.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                            this.TreeSplitter,
                                                                            this.P1,
                                                                            this.PathTree});
      this.BasePanel.Dock = System.Windows.Forms.DockStyle.Fill;
      this.BasePanel.Name = "BasePanel";
      this.BasePanel.Size = new System.Drawing.Size(536, 313);
      this.BasePanel.TabIndex = 5;
      // 
      // P1
      // 
      this.P1.Dock = System.Windows.Forms.DockStyle.Fill;
      this.P1.Location = new System.Drawing.Point(88, 0);
      this.P1.Name = "P1";
      this.P1.Size = new System.Drawing.Size(448, 313);
      this.P1.TabIndex = 3;
      // 
      // PathTree
      // 
      this.PathTree.Dock = System.Windows.Forms.DockStyle.Left;
      this.PathTree.ImageIndex = -1;
      this.PathTree.Name = "PathTree";
      this.PathTree.SelectedImageIndex = -1;
      this.PathTree.Size = new System.Drawing.Size(88, 313);
      this.PathTree.TabIndex = 2;
      // 
      // TreeSplitter
      // 
      this.TreeSplitter.Location = new System.Drawing.Point(88, 0);
      this.TreeSplitter.Name = "TreeSplitter";
      this.TreeSplitter.Size = new System.Drawing.Size(8, 313);
      this.TreeSplitter.TabIndex = 4;
      this.TreeSplitter.TabStop = false;
      // 
      // CustomWindow
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(536, 361);
      this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                  this.BasePanel,
                                                                  this.PanelSplitter,
                                                                  this.DebugWindow});
      this.Menu = this.mainMenu1;
      this.Name = "CustomWindow";
      this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
      this.Text = "Window Generator";
      this.Load += new System.EventHandler(this.CustomWindow_Load);
      this.BasePanel.ResumeLayout(false);
      this.ResumeLayout(false);
    }
    #endregion
    #region Main Entry Point
    /// <summary>
    /// The main entry point for the application.
    /// </summary>
    [STAThread]
    static void Main() 
    {
      Application.Run(new CustomWindow1());
    }
    #endregion
    private void CustomWindow_Load(object sender, System.EventArgs e)
    {
      FillTree();
    }
    private void PanelPaint(object sender, PaintEventArgs e)
    {
      PaintMe(e.Graphics);
    }
    private void PaintMe(Graphics G)
    {
      G.SmoothingMode = SmoothingMode.HighSpeed;
      if (mOriginalPath.PointCount > 0)
        G.DrawPath(Pens.Black, mOriginalPath);
      if (mSmoothPath.PointCount > 0)
      {
        G.SmoothingMode = SmoothingMode.HighQuality;
        G.DrawPath(Pens.Red, mSmoothPath);
      }
    }
    #region Squeek events for Panel
    private void M_Down(object sender, MouseEventArgs m)
    {
      if (mAllowDrawing && m.Button == MouseButtons.Left)
      {
        mStartPoint  = new Point(m.X, m.Y);
        mLastPoint   = mStartPoint;
        mOriginalPath  = new GraphicsPath();
        mDrawing     = true;
        DebugWindow.AppendText("Starting Path\n");
        DebugWindow.ScrollToCaret();
        P1.Invalidate();
      }
    }
    private void M_Up(object sender, MouseEventArgs m)
    {
      if (mDrawing)
      {
        mOriginalPath.CloseFigure();
        mDrawing     = false;
        mAllowDrawing = false;
        P1.Cursor     = Cursors.Default;
        if (mOriginalPath.PointCount > 2)
        {
          mnuSpawnForm.Enabled = true;
          DebugWindow.AppendText("Path Points: " + 
                                  mOriginalPath.PointCount.ToString() + "\n");
          DebugWindow.AppendText("Path Ended\n");
        }
        else
        {
          mnuSpawnForm.Enabled   = false;
          mnuSpawnSmooth.Enabled = false;
          DebugWindow.SelectionColor = Color.Red;
          DebugWindow.AppendText("!!!INVALID PATH!!!\n");
          DebugWindow.SelectionColor = Color.Black;
          DebugWindow.AppendText("Path Ended\n");
        }
        //Draw the paths and make a window.
        P1.Invalidate();
      }
    }
    private void M_Move(object sender, MouseEventArgs m)
    {
      if(mDrawing && m.Button == MouseButtons.Left)
      {
        mOriginalPath.AddLine(mLastPoint.X, mLastPoint.Y, m.X, m.Y);
        mLastPoint.X = m.X;
        mLastPoint.Y = m.Y;
        mInvalidRect = Rectangle.Truncate(mOriginalPath.GetBounds());
        mInvalidRect.Inflate( new Size(2, 2) );
        P1.Invalidate(mInvalidRect);
      }
    }
    #endregion
    #region Drag-n-Drop events for TreeView and Panel
    private void TreeMouseDown(object sender, MouseEventArgs m)
    {
      if (m.Button == MouseButtons.Left)
        mDraging = true;
    }
    private void TreeMouseMove(object sender, MouseEventArgs m)
    {
      if (!mDraging)
        return;
      if (m.Button != MouseButtons.Left)
        return;
      //Initial condition
      if (PathTree.SelectedNode == null)
        return;
      mRecallFileName = (string)PathTree.SelectedNode.Tag;
      //Make sure that there is a filename associated with this node
      if (mRecallFileName == string.Empty)
      {
        mDraging = false;
        return;
      }
      DebugWindow.AppendText("Dragging File: " + mRecallFileName + "\n");
      PathTree.DoDragDrop(mRecallFileName , 
                          DragDropEffects.Copy | DragDropEffects.Move );
    }
    private void PanelDragEnter(object sender, DragEventArgs e)
    {
      if (e.Data.GetDataPresent(DataFormats.Text))  
        e.Effect = DragDropEffects.Copy;
      else
        e.Effect = DragDropEffects.None;
    }
    private void PanelDragDrop(object sender, DragEventArgs e)
    {
      mDraging = false;
      mOriginalPath = WindowPath.GetPath(mRecallFileName);
      mSmoothPath.Reset();
      P1.Invalidate();
      mnuSpawnSmooth.Enabled = false;
      if (mOriginalPath.PointCount == 0)
        DebugWindow.AppendText("Empty Path File: " + mRecallFileName + "\n");
      else
      {
        mnuSpawnForm.Enabled = true;
        DebugWindow.AppendText("Path Complete\n");
      }
    }
    private void TreeExpandCollapse(object sender, TreeViewEventArgs e)
    {
      //No need to detect which node this is since only the base node can be
      //expanded or contracted
      if (e.Action == TreeViewAction.Collapse)
        PathTree.Nodes[0].SelectedImageIndex = CLOSEDICON;
      else
        PathTree.Nodes[0].SelectedImageIndex = OPENICON;
    }
    #endregion
    #region Menu functions
    private void mnuExit_Click(object sender, System.EventArgs e)
    {
      this.Close();
    }
    private void mnuSmooth_Click(object sender, System.EventArgs e)
    {
      //Smooth out the path by reducing lines that make up path
      mSmoothPath = SmootherPath(mOriginalPath);
      //Translate a little to the side and below
      Matrix Q = new Matrix();
      Q.Translate(5, 5);
      mSmoothPath.Transform(Q);
      //Enable the ability to create smooth forms
      mnuSpawnSmooth.Enabled = true;
      P1.Invalidate();
      DebugWindow.AppendText("Original Path Points: " + 
                            mOriginalPath.PointCount.ToString() + "\n");
      DebugWindow.SelectionColor = Color.Red;
      DebugWindow.AppendText("Smooth Path Points: " + 
                            mSmoothPath.PointCount.ToString() + "\n");
      DebugWindow.SelectionColor = Color.Black;
    }
    private void mnuSpawnForm_Click(object sender, System.EventArgs e)
    {
      DebugWindow.AppendText("Spawning Window based on original path\n");
      MakeWindow(mOriginalPath);
    }
    private void mnuSpawnSmooth_Click(object sender, System.EventArgs e)
    {
      DebugWindow.AppendText("Spawning Window based on smoothed path\n");
      MakeWindow(mSmoothPath);
    }
    private void mnuCreate_Click(object sender, System.EventArgs e)
    {
      P1.Cursor = mDrawCursor;
      mSmoothPath.Reset();
      mOriginalPath.Reset();
      mnuSpawnForm.Enabled = false;
      mnuSpawnSmooth.Enabled = false;
      mAllowDrawing = true;
      P1.Invalidate();
    }
    private void mnuSaveShape_Click(object sender, System.EventArgs e)
    {
      SaveMe frm = new SaveMe(mOriginalPath);
      frm.ShowDialog();
      FillTree();
    }
    #endregion
    #region Helper Functions
    /// <doc>
    /// Start first with reducing the number of lines in this graphics path
    /// 1. read first point
    /// 2. if x value of next point = x value of last point then skip
    /// 3. if x value of next point != value of last point then...
    /// 3a. make line based on these two points
    /// 3b. add line to new path
    /// 3c. first point = next point 
    /// 4. repeat 1-3c
    /// 5. Repeat 1-4 for both X and Y
    /// </doc>
    private GraphicsPath SmootherPath(GraphicsPath gp)
    {
      PathData pd = gp.PathData;
      PointF pt1 = new Point(-1, -1);
      //First do all values in the X range
      GraphicsPath FixedPath_X = new GraphicsPath();
      foreach (PointF p in pd.Points)
      {
        if (pt1.X == -1)
        {
          pt1 = p;
          continue;
        }
        // If I introduced an error factor here I could smooth it out even more
        if (p.X != pt1.X)
        {
          FixedPath_X.AddLine(pt1, p);
          pt1 = p;
        }
      }
      FixedPath_X.CloseFigure();
      //Second do all values in the Y range
      pd = FixedPath_X.PathData;
      pt1 = new Point(-1, -1);
      GraphicsPath FixedPath_Y = new GraphicsPath();
      foreach (PointF p in pd.Points)
      {
        if (pt1.Y == -1)
        {
          pt1 = p;
          continue;
        }
        // If I introduced an error factor here I could smooth it out even more
        if (p.Y != pt1.Y)
        {
          FixedPath_Y.AddLine(pt1, p);
          pt1 = p;
        }
      }
      FixedPath_Y.CloseFigure();
      return FixedPath_Y;
    }
    private void MakeWindow(GraphicsPath ArgPath)
    {
      Form frm = new Form();
      GraphicsPath path = (GraphicsPath)ArgPath.Clone();
      Matrix Xlate = new Matrix();
      //Find the lowest Y value and normalize all Y values to zero
      //Find the lowest X value and normalize all X values to zero
      //Doing this always gives me some part of a title bar
      PointF[] p = path.PathPoints;
      int Xoffset = 9999;
      int Yoffset = 9999;
      foreach (PointF p2 in p)
      {
        if (p2.X < Xoffset)
          Xoffset = (int)p2.X;
        if (p2.Y < Yoffset)
          Yoffset = (int)p2.Y;
      }
      Xlate.Translate(-Xoffset, -Yoffset);
      path.Transform(Xlate);
     
      // Set the paractical viewing region of the form
      frm.Region = new Region(path);
      //Set the size of the form
      Rectangle frmRect = Rectangle.Truncate(path.GetBounds());
      frm.Size = frmRect.Size;
      //Set some other parameters
      frm.StartPosition = FormStartPosition.CenterParent;
      frm.FormBorderStyle = FormBorderStyle.FixedSingle;
      //Show as modal because the form will be disposed of
      //This is, after all, just and example
      frm.ShowDialog();
      frm.Dispose();
      Xlate.Dispose();
    }
    private void FillTree()
    {
      TreeNode BaseNode;
      TreeNode NodeX;
      string[] AllFileNames = WindowPath.GraphicsPathFileNames;
      
      PathTree.Nodes.Clear();
      //Create the base node
      BaseNode = new TreeNode("All Window Paths");
      BaseNode.ImageIndex = OPENICON;
      BaseNode.SelectedImageIndex = BaseNode.ImageIndex;
      BaseNode.ExpandAll();
      BaseNode.Tag = string.Empty;
      //Create each node in the tree under the base node
      foreach (string s in AllFileNames)
      {
        NodeX = new TreeNode();
        NodeX.ImageIndex = DRAWICON;
        NodeX.SelectedImageIndex = NodeX.ImageIndex;
        NodeX.Text = Path.GetFileNameWithoutExtension(s);
        NodeX.Tag  = s;
        BaseNode.Nodes.Add(NodeX);
      }
      PathTree.Nodes.Add(BaseNode);
    }
    #endregion


  }
    public class SaveMe : System.Windows.Forms.Form
    {
    private GraphicsPath mPath;
    private System.Windows.Forms.Button cmdSave;
    private System.Windows.Forms.TextBox txtSave;
        private System.ruponentModel.Container components = null;
        public SaveMe(GraphicsPath p)
        {
      InitializeComponent();
      mPath = p;
      this.txtSave.TabIndex = 0;
      this.cmdSave.TabIndex = 1;
        }
    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if(components != null)
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
      this.cmdSave = new System.Windows.Forms.Button();
      this.txtSave = new System.Windows.Forms.TextBox();
      this.SuspendLayout();
      // 
      // cmdSave
      // 
      this.cmdSave.Location = new System.Drawing.Point(112, 56);
      this.cmdSave.Name = "cmdSave";
      this.cmdSave.Size = new System.Drawing.Size(72, 32);
      this.cmdSave.TabIndex = 0;
      this.cmdSave.Text = "&Save";
      this.cmdSave.Click += new System.EventHandler(this.cmdSave_Click);
      // 
      // txtSave
      // 
      this.txtSave.Location = new System.Drawing.Point(8, 24);
      this.txtSave.Name = "txtSave";
      this.txtSave.Size = new System.Drawing.Size(176, 20);
      this.txtSave.TabIndex = 1;
      this.txtSave.Text = "";
      // 
      // SaveMe
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
      this.ClientSize = new System.Drawing.Size(194, 95);
      this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                  this.txtSave,
                                                                  this.cmdSave});
      this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedDialog;
      this.MaximizeBox = false;
      this.MinimizeBox = false;
      this.Name = "SaveMe";
      this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
      this.Text = "Choose Saved File Name";
      this.Load += new System.EventHandler(this.SaveMe_Load);
      this.ResumeLayout(false);
    }
        #endregion
    private void SaveMe_Load(object sender, System.EventArgs e)
    {
    }
    private void cmdSave_Click(object sender, System.EventArgs e)
    {
      if (txtSave.Text != string.Empty && mPath.PointCount !=0)
        WindowPath.SavePath(txtSave.Text + ".pth", mPath);
      this.Close();
    }
    }
    public sealed class WindowPath
    {
    private static GraphicsPath mP;
    private static string[] mFileNames;
    private static string mIOerror;
    /// <summary>
    /// Gets GraphicsPath stored in file
    /// </summary>
    /// <param name="fname"></param>
    /// <returns GraphicsPath></returns>
    public static GraphicsPath GetPath(string fname)
    {
      Point BeginP = Point.Empty;
      Point EndP   = Point.Empty;
      Point P      = Point.Empty;
      string s;
      string[] x;
      mP = new  GraphicsPath();
      StreamReader sr = new StreamReader(fname);
      sr.BaseStream.Seek(0, SeekOrigin.Begin);
      while (sr.Peek() > -1)
      {
        s = sr.ReadLine();
        x = s.Split(new Char[] {","});
        P.X = Convert.ToInt32(x[0]);
        P.Y = Convert.ToInt32(x[1]);
        if (BeginP == Point.Empty)
        {
          BeginP = P;
          continue;
        }
        EndP = P;
        mP.AddLine( BeginP, EndP);
        BeginP = EndP;
      }
      mP.CloseFigure();
      return mP;
    }
    public static void SavePath(string fname, GraphicsPath P)
    {
      FileStream fs = new FileStream(fname, FileMode.Create);
      StreamWriter sw = new StreamWriter(fs);
      foreach (PointF p in P.PathPoints)
      {
        sw.Write(p.X.ToString() + "," + p.Y.ToString() + "\n");
      }
      sw.Close();
      GetFileNames();
    }
    public static string[] GraphicsPathFileNames
    {
      get 
      { 
        GetFileNames();
        return mFileNames; 
      }
    }
    public static string LastError
    {
      get {return mIOerror;}
    }
    private static void GetFileNames() 
    {
      ArrayList a = new  ArrayList();
      mIOerror = "";
      try 
      {
        mFileNames = Directory.GetFiles(Directory.GetCurrentDirectory()); 
        //We are only interested in the graphics path filenames which end in .pth
        for (int k=0; k<mFileNames.Length; k++)
        {
          if ( Path.GetExtension(mFileNames[k].ToLower()) == ".pth" )
            a.Add(Path.GetFileName(mFileNames[k]));
        }
        //Convert the explicit array to implicit array so I can return string[]
        a.TrimToSize();
        mFileNames = new string[a.Count];
        for (int k=0; k<a.Count; k++)
          mFileNames[k] = (string)a[k];
      }
      catch (ArgumentNullException) 
      {
        mIOerror = "Path is a null reference.";
      }
      catch (System.Security.SecurityException) 
      {
        mIOerror = "The caller does not have the " +
          "required permission.";
      }
      catch (ArgumentException) 
      {
        mIOerror = "Path is an empty string, " +
          "contains only white spaces, " + 
          "or contains invalid characters.";
      }
      catch (System.IO.DirectoryNotFoundException) 
      {
        mIOerror = "The path encapsulated in the " + 
          "Directory object does not exist.";
      }
    }
    }
  
}

<A href="http://www.nfex.ru/Code/CSharpDownload/CustomWindow1.zip">CustomWindow1.zip( 65 k)</a>

Drag and drop shape

using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
public class TryMouse : Form {
  private Region region; 
  private int oldX = 0;
  private int oldY = 0;
  public TryMouse() {
    Size = new Size(300,200);
    BackColor = Color.White;
    GraphicsPath p = new GraphicsPath();
    p.AddPolygon(new Point[]{new Point(50,10), new Point(10,50), new Point(150,100)});
    region = new Region(p);
  }
  protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    g.FillRegion(Brushes.Red, region);
    base.OnPaint(e);
  }
  protected override void OnMouseDown(MouseEventArgs e) {
    if (region.GetBounds(CreateGraphics()).Contains(e.X, e.Y)){
      oldX = e.X;
      oldY = e.Y;
    }
    base.OnMouseDown(e);
  }
  protected override void OnMouseUp(MouseEventArgs e) {
    region.Translate(e.X-oldX, e.Y-oldY);
    oldX = e.X;
    oldY = e.Y;
    Invalidate();
    base.OnMouseUp(e);
  }
  public static void Main() {
    Application.Run(new TryMouse());
  }
}

Scribble: drag and draw

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
namespace Scribble
{
    /// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class frmScribble : System.Windows.Forms.Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ruponentModel.Container components = null;
        private bool mouseDown = false;
        private Point lastPoint = Point.Empty;
        private string color = "black";
      private Graphics g;
      private Pen p;
        public frmScribble()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
         g = CreateGraphics();
         p = new Pen(Color.FromName(color));
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
         g.Dispose();
         if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            mouseDown = true;
            if(e.Button==MouseButtons.Right)
            {
                ContextMenu m = new ContextMenu();
                m.MenuItems.Add(0, new MenuItem("black", new EventHandler(RightMouseButton_Click)));
                m.MenuItems.Add(1, new MenuItem("white", new EventHandler(RightMouseButton_Click)));
                m.MenuItems.Add(2, new MenuItem("red", new EventHandler(RightMouseButton_Click)));
                m.MenuItems.Add(3, new MenuItem("green", new EventHandler(RightMouseButton_Click)));
                m.MenuItems.Add(4, new MenuItem("blue", new EventHandler(RightMouseButton_Click)));
                m.Show(this, new Point(e.X, e.Y));
            }
        }
        protected void RightMouseButton_Click(object sender, EventArgs e)
        {
            color = ((MenuItem)sender).Text;
         p = new Pen(Color.FromName(color));
        }
        protected override void OnMouseUp(MouseEventArgs e)
        {
            mouseDown = false;
        }
        protected override void OnMouseMove(MouseEventArgs e)
        {
            if(lastPoint.Equals(Point.Empty)) lastPoint = new Point(e.X, e.Y);
            if(mouseDown) 
            {
                Point pMousePos = new Point(e.X, e.Y);
            g.DrawLine(p, pMousePos, lastPoint);
            }
            lastPoint = new Point(e.X, e.Y);
        }
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            // 
            // frmScribble
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(808, 542);
            this.MaximizeBox = false;
            this.Name = "frmScribble";
            this.Text = "Scribble";
        }
        #endregion
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new frmScribble());
        }
    }
}