What can be simpler than graphical primitives? Part 3

using System;
using System .Collections .Generic;
using System .ComponentModel;
using System .Drawing;
using System .Drawing .Drawing2D;
using System .Windows .Forms;
using Microsoft .Win32;

using MoveGraphLibrary;

namespace GraphicalPrimitives
{
    public partial class Form_CircleSector : Form
    {
        int m_version = 620;
        const string strAddRegKey = "Form_CircleSector";

        Mover mover;
        Point ptMouse_Down, ptMouse_Up;
        SolitaryControl scCovers, scAdd;
        CircleSector sectorPressed;
        int iSectorPressed;
        List<CircleSector> sectors = new List<CircleSector> ();
        TextM info;
        string infotext = "Size of a sector can be changed by moving any border.\n" +
                          "The sweep angle is limited by 180 degrees.\n" +
                          "Forward moving and rotation can be started at any inner point.";

        bool bShowCovers = false;
        Random rand;
        bool bRestore = false;

        // --------------------------------------
        public Form_CircleSector ()
        {
            InitializeComponent ();
            mover = new Mover (this);

            int nSeed;
            rand = Auxi_Common .RandomByCurTime (out nSeed);
        }
        // -------------------------------------------------        OnLoad
        private void OnLoad (object sender, EventArgs e)
        {
            RestoreFromRegistry ();
            if (!bRestore)
            {
                DefaultView ();
            }
            RenewMover ();
        }
        // -------------------------------------------------        OnFormClosing
        private void OnFormClosing (object sender, FormClosingEventArgs e)
        {
            SaveIntoRegistry ();
        }
        // -------------------------------------------------        DefaultView
        public void DefaultView ()
        {
            ClientSize = new Size (800, 600);
            btnCovers .Location = new Point (20, 20);
            btnAdd .Location = new Point (60, 20);

            sectors .Clear ();
            sectors .Add (new CircleSector (this, mover, new PointF (240, 240), 170, 20, 170, Color .Blue));
            sectors .Add (new CircleSector (this, mover, new PointF (550, 470), 170, 160, -110, Color .Lime));

            scCovers = new SolitaryControl (btnCovers);
            scAdd = new SolitaryControl (btnAdd);
            info = new TextM (this, new Point (300, 16), infotext);
            info .BackColor = Color .Lime;
        }
        // -------------------------------------------------        RenewMover
        public void RenewMover ()
        {
            mover .Clear ();
            mover .Add (scCovers);
            mover .Add (scAdd);
            mover .Add (info);
            for (int i = 0; i < sectors .Count; i++)
            {
                mover .Add (sectors [i]);
            }
        }
        // -------------------------------------------------        OnPaint
        private void OnPaint (object sender, PaintEventArgs e)
        {
            Graphics grfx = e .Graphics;
            GraphicalObject grobj;

            for (int i = mover .Count - 1; i >= 0; i--)
            {
                grobj = mover [i] .Source;
                if (grobj is CircleSector)
                {
                    (grobj as CircleSector) .Draw (grfx);
                    if (bShowCovers)
                    {
                        mover [i] .DrawCover (grfx);
                    }
                }
            }
            info .Draw (grfx);
        }
        // -------------------------------------------------        OnMouseDown
        private void OnMouseDown (object sender, MouseEventArgs e)
        {
            ptMouse_Down = e .Location;
            if (mover .Catch (e .Location, e .Button))
            {
                GraphicalObject grobj = mover .CaughtSource;
                if (grobj is CircleSector)
                {
                    CircleSector sector = grobj as CircleSector;
                    int iNode = mover .CaughtNode;
                    if (e .Button == MouseButtons .Left  &&  (iNode == 0  ||  iNode == 1  ||  iNode == 5))
                    {
                        sector .StartResizing (e .Location, mover .CaughtNode);
                    }
                    else if (e .Button == MouseButtons .Right)
                    {
                        sector .StartRotation (e .Location);
                    }
                }
            }
            ContextMenuStrip = null;
        }
        // -------------------------------------------------        OnMouseUp
        private void OnMouseUp (object sender, MouseEventArgs e)
        {
            ptMouse_Up = e .Location;
            double dist = Auxi_Geometry .Distance (ptMouse_Down, ptMouse_Up);

            if (mover .Release ())
            {
                GraphicalObject grobj = mover .WasCaughtSource;
                if (e .Button == MouseButtons .Right && dist <= 3)
                {
                    if (grobj is CircleSector)
                    {
                        long idSector = mover .WasCaughtSource .ID;
                        for (int i = sectors .Count - 1; i >= 0; i--)
                        {
                            if (idSector == sectors [i] .ID)
                            {
                                iSectorPressed = i;
                                sectorPressed = sectors [i];
                                break;
                            }
                        }
                        ContextMenuStrip = menuOnSectors;
                    }
                    else if (grobj is TextM)
                    {
                        ContextMenuStrip = menuOnInfo;
                    }
                }
            }
            else
            {
                if (e .Button == MouseButtons .Right && dist <= 3)
                {
                    ContextMenuStrip = menuOnEmpty;
                }
            }
        }
        // -------------------------------------------------        OnMouseMove
        private void OnMouseMove (object sender, MouseEventArgs e)
        {
            if (mover .Move (e .Location))
            {
                Invalidate ();
            }
        }
        // -------------------------------------------------        OnContextMenuChanged
        private void OnContextMenuChanged (object sender, EventArgs e)
        {
            if (ContextMenuStrip != null)
            {
                ContextMenuStrip .Show (PointToScreen (ptMouse_Up));
            }
        }

        // *****   menuOnSectors   *****
        // -------------------------------------------------        OnOpening_menuOnSectors
        private void OnOpening_menuOnSectors (object sender, CancelEventArgs e)
        {
            ToolStripItemCollection items = menuOnSectors .Items;

            items ["miPutOnTop"] .Enabled = iSectorPressed > 0;
            items ["miOneLevelUp"] .Enabled = iSectorPressed > 0;
            items ["miOneLevelDown"] .Enabled = iSectorPressed < sectors .Count - 1;
            items ["miPutUnderneath"] .Enabled = iSectorPressed < sectors .Count - 1;
            ((ToolStripMenuItem) (items ["miFixedStartingSide"])) .Checked = sectorPressed .FixedStartingSide;
        }
        // -------------------------------------------------        Click_miPutOnTop
        private void Click_miPutOnTop (object sender, EventArgs e)
        {
            sectors .RemoveAt (iSectorPressed);
            sectors .Insert (0, sectorPressed);
            RenewMover ();
            Invalidate ();
        }
        // -------------------------------------------------        Click_miOneLevelUp
        private void Click_miOneLevelUp (object sender, EventArgs e)
        {
            sectors .Reverse (iSectorPressed - 1, 2);
            RenewMover ();
            Invalidate ();
        }
        // -------------------------------------------------        Click_miOneLevelDown
        private void Click_miOneLevelDown (object sender, EventArgs e)
        {
            sectors .Reverse (iSectorPressed, 2);
            RenewMover ();
            Invalidate ();
        }
        // -------------------------------------------------        Click_miPutUnderneath
        private void Click_miPutUnderneath (object sender, EventArgs e)
        {
            sectors .RemoveAt (iSectorPressed);
            sectors .Add (sectorPressed);
            RenewMover ();
            Invalidate ();
        }
        // -------------------------------------------------        Click_miDuplicate
        private void Click_miDuplicate (object sender, EventArgs e)
        {
            int dx = 50;
            int dy = 50;
            CircleSector sectorNew = sectorPressed .Copy (new PointF (sectorPressed .Center .X + dx, sectorPressed .Center .Y + dy));
            sectors .Insert (0, sectorNew);
            RenewMover ();
            Invalidate ();
        }
        // -------------------------------------------------        Click_miDelete
        private void Click_miDelete (object sender, EventArgs e)
        {
            sectors .RemoveAt (iSectorPressed);
            RenewMover ();
            Invalidate ();
        }
        // -------------------------------------------------        Click_miColor
        private void Click_miColor (object sender, EventArgs e)
        {
            ColorDialog dlg = new ColorDialog ();

            dlg .Color = sectorPressed .Color;
            if (dlg .ShowDialog () == DialogResult .OK)
            {
                sectorPressed .Color = dlg .Color;
                Invalidate ();
            }
        }
        // -------------------------------------------------        Click_miFixedStartingSide
        private void Click_miFixedStartingSide (object sender, EventArgs e)
        {
            sectorPressed .FixedStartingSide = !sectorPressed .FixedStartingSide;
            Invalidate ();
        }

        // *****   menuOnInfo   *****
        // -------------------------------------------------        Click_miInfoFont
        private void Click_miInfoFont (object sender, EventArgs e)
        {
            FontDialogWithTitle dlg = new FontDialogWithTitle ();

            dlg .Font = info .Font;
            dlg .Title = "Information font";
            if (dlg .ShowDialog () == DialogResult .OK)
            {
                info .Font = dlg .Font;
                Invalidate ();
            }
        }
        // -------------------------------------------------        Click_miInfoTextColor
        private void Click_miInfoTextColor (object sender, EventArgs e)
        {
            ColorDialogWithTitle dlg = new ColorDialogWithTitle ();

            dlg .Color = info .Color;
            dlg .Title = "Information color";
            if (dlg .ShowDialog () == DialogResult .OK)
            {
                info .Color = dlg .Color;
                Invalidate ();
            }
        }
        // -------------------------------------------------        Click_miInfoBackColor
        private void Click_miInfoBackColor (object sender, EventArgs e)
        {
            ColorDialogWithTitle dlg = new ColorDialogWithTitle ();

            dlg .Color = info .BackColor;
            dlg .Title = "Information background";
            if (dlg .ShowDialog () == DialogResult .OK)
            {
                info .BackColor = dlg .Color;
                Invalidate ();
            }
        }

        // *****   menuOnEmpty   *****
        // -------------------------------------------------        Click_miDefaultView
        private void Click_miDefaultView (object sender, EventArgs e)
        {
            DefaultView ();
            RenewMover ();
            Invalidate ();
        }
        // -------------------------------------------------        Click_btnCovers
        private void Click_btnCovers (object sender, EventArgs e)
        {
            bShowCovers = !bShowCovers;
            Invalidate ();
        }
        // -------------------------------------------------        Click_btnAdd
        private void Click_btnAdd (object sender, EventArgs e)
        {
            CircleSector sector = new CircleSector (this, mover, Auxi_Geometry .Middle (ClientRectangle),
                                                    Convert .ToSingle (CircleSector .MinimumRadius + rand .Next (300)),
                                                    rand .Next (360),
                                                    rand .Next (360) - 180,
                                                    Auxi_Colours .RandomColor);
            sectors .Insert (0, sector);
            RenewMover ();
            Invalidate ();
        }

        const string name = "Main";
        // -------------------------------------------------        SaveIntoRegistry
        private void SaveIntoRegistry ()
        {
            string strRegKey = Form_Main .strRegKey + strAddRegKey;

            RegistryKey regkey = null;
            try
            {
                regkey = Registry .CurrentUser .CreateSubKey (strRegKey);
                if (regkey != null)
                {
                    regkey .SetValue (name, new string [] { m_version .ToString (),             // 0
                                                            ClientSize .Width .ToString (),     // 1
                                                            ClientSize .Height .ToString (),    // 2
                                                            bShowCovers .ToString (),           // 3
                                                            sectors .Count .ToString () },      // 4
                                      RegistryValueKind .MultiString);
                    scCovers .IntoRegistry (regkey, "scCovers");
                    scAdd .IntoRegistry (regkey, "scAdd");
                    info .IntoRegistry (regkey, "Info");
                    for (int i = 0; i < sectors .Count; i++)
                    {
                        sectors [i] .IntoRegistry (regkey, i .ToString ());
                    }
                }
            }
            catch
            {
            }
            finally
            {
                if (regkey != null) regkey .Close ();
            }
        }
        // -------------------------------------------------        RestoreFromRegistry
        private void RestoreFromRegistry ()
        {
            string namekey = Auxi_DLL_Internal .PathDefinedByExecutable ();
            namekey += strAddRegKey;

            RegistryKey regkey = null;
            try
            {
                regkey = Registry .CurrentUser .OpenSubKey (namekey);
                if (regkey != null)
                {
                    string [] strs = (string []) regkey .GetValue (name);
                    if (strs != null && strs .Length == 5 && Convert .ToInt32 (strs [0]) >= 620)
                    {
                        ClientSize = Auxi_Convert .ToSize (strs, 1);
                        bShowCovers = Convert .ToBoolean (strs [3]);
                        int nFigures = Convert .ToInt32 (strs [4]);
                        scCovers = SolitaryControl .FromRegistry (regkey, "scCovers", btnCovers);
                        scAdd = SolitaryControl .FromRegistry (regkey, "scAdd", btnAdd);
                        info = TextM .FromRegistry (this, regkey, "Info");
                        sectors .Clear ();
                        for (int i = 0; i < nFigures; i++)
                        {
                            CircleSector sector = CircleSector .FromRegistry (this, mover, regkey, i .ToString ());
                            if (sector != null)
                            {
                                sectors .Add (sector);
                            }
                        }
                        if (scCovers == null || scAdd == null || sectors .Count < nFigures)
                        {
                            return;
                        }
                        bRestore = true;
                    }
                    regkey .Close ();
                }
            }
            catch
            {
            }
            finally
            {
                if (regkey != null) regkey .Close ();
            }
        }
    }
}