// GfxEd8
// Copyright (C) 2004  Ian Cowburn
// 
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//
// $Id$
//
using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using GfxEdInterface;

using System.Diagnostics;

namespace GfxEd8
{
	/// <summary>
	/// Implements a control for drawing
	/// </summary>
	[ToolboxItem(true)]
	public class GfxEditor : System.Windows.Forms.UserControl
	{
		private System.Windows.Forms.Label m_fgPreview;
		private System.Windows.Forms.PictureBox m_edit;
		private System.Windows.Forms.ComboBox m_modeList;
		private System.Windows.Forms.Label m_bgPreview;
		private System.Windows.Forms.NumericUpDown m_leftCol;
		private System.Windows.Forms.NumericUpDown m_rightCol;
		private System.Windows.Forms.PictureBox m_preview;
		private System.Windows.Forms.Button m_palButton;
		private System.Windows.Forms.TextBox m_name;
		private System.Windows.Forms.Button m_undoButton;
		private System.Windows.Forms.Label label3;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label5;
		private System.Windows.Forms.Label label4;
		private System.Windows.Forms.ComboBox m_size;
		
		private const uint	SIZE=256;
		private const uint	TRANS=UInt32.MaxValue;

		// These MUST match the entries in the drop down list
		//
		private enum Mode
		{
			ePlot,
			eLine,
			eRectangle,
			eFilledRectangle,
			eCircle,
			eFilledCircle,
			eEllipse,
			eFilledEllipse,
			eFloodFill,
			eCopyPaste
		};

		//private bool		m_inEditor;
		
		private IPlugin		m_plugin;
		private Sprite		m_sprite;
		private Sprite		m_undo;
		private SpriteSize	m_sprsize;
		private Colour[]	m_pal;
		private uint		m_width;
		private uint		m_height;
		
		private Rectangle	m_editRect;
		private Bitmap		m_editBmp;
		private Rectangle	m_prevRect;
		private Bitmap		m_prevBmp;
		
		private uint		m_gridx;
		private uint		m_gridy;
		private uint		m_mx;
		private uint		m_my;
		private Color		m_gridCol;
		
		private bool		m_drawing;
		private Mode		m_mode;
		private uint[,]		m_overlay;
		private uint		m_ox;
		private uint		m_oy;
		private uint		m_pen;
		
		private CopyMenu	m_cpMenu;
		private uint		m_cpX;
		private uint		m_cpY;
		private uint		m_cpWidth;
		private uint		m_cpHeight;
		private uint[,]		m_cpBuff;
		
		public GfxEditor()
		{
			//
			// InitializeComponent() call is required for Windows Forms designer support.
			//
			InitializeComponent();
			
			//m_inEditor=false;
			
			m_sprite=null;
			m_gridx=8;
			m_gridy=8;
			m_mx=SIZE;
			m_my=SIZE;
			m_gridCol=Color.LightGreen;
			
			m_editRect=m_edit.ClientRectangle;
			m_editBmp=new Bitmap(m_editRect.Width,m_editRect.Height);
			m_edit.Image=m_editBmp;

			m_prevRect=m_edit.ClientRectangle;
			m_prevBmp=new Bitmap(m_prevRect.Width,m_prevRect.Height);
			m_preview.Image=m_prevBmp;
			
			m_drawing=false;
			m_mode=Mode.ePlot;
			
			if (m_editRect.Width!=SIZE && m_editRect.Height!=SIZE)
			{
				throw new Exception("GfxEditor built with bad SIZE!");
			}

			m_modeList.SelectedIndex=0;
			
			m_cpMenu=new CopyMenu();
		}
		
		#region Windows Forms Designer generated code
		/// <summary>
		/// This method is required for Windows Forms designer support.
		/// Do not change the method contents inside the source code editor. The Forms designer might
		/// not be able to load this method if it was changed manually.
		/// </summary>
		private void InitializeComponent() {
			this.m_size = new System.Windows.Forms.ComboBox();
			this.label4 = new System.Windows.Forms.Label();
			this.label5 = new System.Windows.Forms.Label();
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.label3 = new System.Windows.Forms.Label();
			this.m_undoButton = new System.Windows.Forms.Button();
			this.m_name = new System.Windows.Forms.TextBox();
			this.m_palButton = new System.Windows.Forms.Button();
			this.m_preview = new System.Windows.Forms.PictureBox();
			this.m_rightCol = new System.Windows.Forms.NumericUpDown();
			this.m_leftCol = new System.Windows.Forms.NumericUpDown();
			this.m_bgPreview = new System.Windows.Forms.Label();
			this.m_modeList = new System.Windows.Forms.ComboBox();
			this.m_edit = new System.Windows.Forms.PictureBox();
			this.m_fgPreview = new System.Windows.Forms.Label();
			((System.ComponentModel.ISupportInitialize)(this.m_rightCol)).BeginInit();
			((System.ComponentModel.ISupportInitialize)(this.m_leftCol)).BeginInit();
			this.SuspendLayout();
			// 
			// m_size
			// 
			this.m_size.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this.m_size.Location = new System.Drawing.Point(280, 64);
			this.m_size.MaxDropDownItems = 16;
			this.m_size.Name = "m_size";
			this.m_size.Size = new System.Drawing.Size(96, 21);
			this.m_size.TabIndex = 9;
			this.m_size.SelectedIndexChanged += new System.EventHandler(this.OnSize);
			// 
			// label4
			// 
			this.label4.Location = new System.Drawing.Point(280, 128);
			this.label4.Name = "label4";
			this.label4.Size = new System.Drawing.Size(32, 16);
			this.label4.TabIndex = 10;
			this.label4.Text = "Left";
			this.label4.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// label5
			// 
			this.label5.Location = new System.Drawing.Point(328, 128);
			this.label5.Name = "label5";
			this.label5.Size = new System.Drawing.Size(48, 16);
			this.label5.TabIndex = 12;
			this.label5.Text = "Right";
			this.label5.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// label1
			// 
			this.label1.Location = new System.Drawing.Point(280, 88);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(64, 16);
			this.label1.TabIndex = 3;
			this.label1.Text = "Draw Mode";
			this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// label2
			// 
			this.label2.Location = new System.Drawing.Point(280, 8);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(64, 16);
			this.label2.TabIndex = 6;
			this.label2.Text = "Name";
			this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// label3
			// 
			this.label3.Location = new System.Drawing.Point(280, 48);
			this.label3.Name = "label3";
			this.label3.Size = new System.Drawing.Size(64, 16);
			this.label3.TabIndex = 8;
			this.label3.Text = "Size";
			this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// m_undoButton
			// 
			this.m_undoButton.Location = new System.Drawing.Point(8, 272);
			this.m_undoButton.Name = "m_undoButton";
			this.m_undoButton.Size = new System.Drawing.Size(72, 24);
			this.m_undoButton.TabIndex = 16;
			this.m_undoButton.Text = "Undo";
			this.m_undoButton.Click += new System.EventHandler(this.OnUndo);
			// 
			// m_name
			// 
			this.m_name.Location = new System.Drawing.Point(280, 24);
			this.m_name.Name = "m_name";
			this.m_name.Size = new System.Drawing.Size(96, 20);
			this.m_name.TabIndex = 7;
			this.m_name.Text = "";
			this.m_name.TextChanged += new System.EventHandler(this.OnNameChanged);
			// 
			// m_palButton
			// 
			this.m_palButton.Location = new System.Drawing.Point(280, 192);
			this.m_palButton.Name = "m_palButton";
			this.m_palButton.Size = new System.Drawing.Size(96, 24);
			this.m_palButton.TabIndex = 14;
			this.m_palButton.Text = "Palette...";
			this.m_palButton.Click += new System.EventHandler(this.OnPalette);
			// 
			// m_preview
			// 
			this.m_preview.BackColor = System.Drawing.SystemColors.Control;
			this.m_preview.Location = new System.Drawing.Point(280, 224);
			this.m_preview.Name = "m_preview";
			this.m_preview.Size = new System.Drawing.Size(34, 34);
			this.m_preview.TabIndex = 1;
			this.m_preview.TabStop = false;
			// 
			// m_rightCol
			// 
			this.m_rightCol.Location = new System.Drawing.Point(328, 144);
			this.m_rightCol.Name = "m_rightCol";
			this.m_rightCol.ReadOnly = true;
			this.m_rightCol.Size = new System.Drawing.Size(40, 20);
			this.m_rightCol.TabIndex = 13;
			this.m_rightCol.ValueChanged += new System.EventHandler(this.OnColourChanged);
			// 
			// m_leftCol
			// 
			this.m_leftCol.Location = new System.Drawing.Point(280, 144);
			this.m_leftCol.Name = "m_leftCol";
			this.m_leftCol.ReadOnly = true;
			this.m_leftCol.Size = new System.Drawing.Size(40, 20);
			this.m_leftCol.TabIndex = 11;
			this.m_leftCol.ValueChanged += new System.EventHandler(this.OnColourChanged);
			// 
			// m_bgPreview
			// 
			this.m_bgPreview.Location = new System.Drawing.Point(328, 168);
			this.m_bgPreview.Name = "m_bgPreview";
			this.m_bgPreview.Size = new System.Drawing.Size(40, 16);
			this.m_bgPreview.TabIndex = 18;
			// 
			// m_modeList
			// 
			this.m_modeList.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
			this.m_modeList.Items.AddRange(new object[] {
						"Plot",
						"Line",
						"Rectangle",
						"Filled Rect",
						"Circle",
						"Filled Circle",
						"Ellipse",
						"Filled Ellipse",
						"Flood Fill",
						"Copy/Paste"});
			this.m_modeList.Location = new System.Drawing.Point(280, 104);
			this.m_modeList.MaxDropDownItems = 16;
			this.m_modeList.Name = "m_modeList";
			this.m_modeList.Size = new System.Drawing.Size(96, 21);
			this.m_modeList.TabIndex = 15;
			this.m_modeList.SelectedIndexChanged += new System.EventHandler(this.OnModeSelect);
			// 
			// m_edit
			// 
			this.m_edit.BackColor = System.Drawing.SystemColors.Control;
			this.m_edit.Location = new System.Drawing.Point(8, 8);
			this.m_edit.Name = "m_edit";
			this.m_edit.Size = new System.Drawing.Size(256, 256);
			this.m_edit.TabIndex = 0;
			this.m_edit.TabStop = false;
			this.m_edit.MouseEnter += new System.EventHandler(this.OnEnterEditor);
			this.m_edit.MouseUp += new System.Windows.Forms.MouseEventHandler(this.OnMouseMove);
			this.m_edit.MouseMove += new System.Windows.Forms.MouseEventHandler(this.OnMouseMove);
			this.m_edit.MouseLeave += new System.EventHandler(this.OnLeaveEditor);
			this.m_edit.MouseDown += new System.Windows.Forms.MouseEventHandler(this.OnMouseMove);
			// 
			// m_fgPreview
			// 
			this.m_fgPreview.Location = new System.Drawing.Point(280, 168);
			this.m_fgPreview.Name = "m_fgPreview";
			this.m_fgPreview.Size = new System.Drawing.Size(40, 16);
			this.m_fgPreview.TabIndex = 17;
			// 
			// GfxEditor
			// 
			this.Controls.Add(this.m_bgPreview);
			this.Controls.Add(this.m_fgPreview);
			this.Controls.Add(this.m_undoButton);
			this.Controls.Add(this.m_modeList);
			this.Controls.Add(this.m_palButton);
			this.Controls.Add(this.m_rightCol);
			this.Controls.Add(this.label5);
			this.Controls.Add(this.m_leftCol);
			this.Controls.Add(this.label4);
			this.Controls.Add(this.m_size);
			this.Controls.Add(this.label3);
			this.Controls.Add(this.m_name);
			this.Controls.Add(this.label2);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.m_preview);
			this.Controls.Add(this.m_edit);
			this.Name = "GfxEditor";
			this.Size = new System.Drawing.Size(384, 304);
			((System.ComponentModel.ISupportInitialize)(this.m_rightCol)).EndInit();
			((System.ComponentModel.ISupportInitialize)(this.m_leftCol)).EndInit();
			this.ResumeLayout(false);
		}
		#endregion

		// -------------------------------------------------------
		// PUBLIC INTERFACES
		// -------------------------------------------------------
		#region Public Interfaces
		
		public Color GridColour
		{
			set {m_gridCol=value;}
		}

		public IPlugin Plugin
		{
			set
			{
				m_plugin=value;
				
				m_pal=m_plugin.Palette;
				
				m_leftCol.Minimum=0;
				m_leftCol.Maximum=m_plugin.MaxColours-1;
				m_leftCol.Value=1;
				
				m_rightCol.Minimum=0;
				m_rightCol.Maximum=m_plugin.MaxColours-1;
				m_rightCol.Value=0;
				
				if (m_plugin.MaxColours<3)
				{
					m_leftCol.Enabled=false;
					m_rightCol.Enabled=false;
				}
				else
				{
					m_leftCol.Enabled=true;
					m_rightCol.Enabled=true;
				}
				
				m_size.Items.Clear();
				
				foreach (SpriteSize sz in m_plugin.AllowedSizes)
				{
					m_size.Items.Add(sz);
				}
				
				m_sprite=null;
				m_undo=null;
				
				InitialiseOverlay();
				
				m_size.SelectedIndex=0;
				
				bool flag=false;
				
				foreach (bool b in m_plugin.SprPalEditable)
				{
					flag|=b;
				}
				
				m_palButton.Enabled=flag;
				
				m_cpBuff=null;
				m_cpMenu.Mode=CopyMenu.EMode.eNothing;
			}
		}
		
		public Sprite Sprite
		{
			get {return m_sprite;}
			set 
			{
				m_sprite=value;
				
				m_name.Text=m_sprite.Name;
				
				for(int f=0;f<m_size.Items.Count;f++)
				{
					SpriteSize sz=(SpriteSize)m_size.Items[f];
					
					if (sz.Width==m_sprite.Width && sz.Height==m_sprite.Height)
					{
						m_size.SelectedIndex=f;
						break;
					}
				}
				
				InitialiseOverlay();
				DrawSprite();
				UpdateColourPreviews();
			}
		}
		
		#endregion
		
		// -------------------------------------------------------
		// SPRITE/GENERAL DRAWING
		// -------------------------------------------------------
		#region Sprite/General Drawing
		
		private void Flush(ref Graphics g)
		{
			g.Flush(FlushIntention.Flush);
			g.Dispose();
			g=null;
		}
		
		private void UpdateColourPreviews()
		{
			m_fgPreview.BackColor=
				m_plugin.Palette[m_sprite.Pal(Convert.ToUInt32(m_leftCol.Value))].DrawCol;

			m_bgPreview.BackColor=
				m_plugin.Palette[m_sprite.Pal(Convert.ToUInt32(m_rightCol.Value))].DrawCol;
		}
		
		private void DrawGrid()
		{
			Graphics g=Graphics.FromImage(m_editBmp);
			Pen p=new Pen(m_gridCol);
			
			g.Clear(m_pal[0].DrawCol);
			Flush(ref g);
			
			g=Graphics.FromImage(m_prevBmp);

			g.Clear(m_pal[0].DrawCol);
			Flush(ref g);
			
			g=Graphics.FromImage(m_editBmp);
			
			for(int x=0;x<m_width+1;x++)
			{
				g.DrawLine(p,x*m_gridx,0,x*m_gridx,m_my);
			}

			for(int y=0;y<m_height+1;y++)
			{
				g.DrawLine(p,0,y*m_gridy,m_mx,y*m_gridy);
			}
			
			Flush(ref g);

			m_edit.Invalidate();
			m_preview.Invalidate();
		}
		
		private void DrawSprite()
		{
			if (m_sprite==null)
			{
				return;
			}
			
			Graphics editg=Graphics.FromImage(m_editBmp);
			Graphics prevg=Graphics.FromImage(m_prevBmp);

			for(uint x=0;x<m_sprite.Width;x++)
				for(uint y=0;y<m_sprite.Height;y++)
					if (m_overlay[x,y]==TRANS)
						SpritePlot(editg,prevg,x,y,m_sprite[x,y]);
					else
						SpritePlot(editg,prevg,x,y,m_overlay[x,y]);

			Flush(ref editg);
			Flush(ref prevg);

			m_edit.Invalidate();
			m_preview.Invalidate();
		}

		// A SpritePlot() for every occasion...
		//
		private void SpritePlot(Graphics edit, Graphics prev,
		                        uint x, uint y, uint col)
		{
			Color c=m_plugin.Palette[m_sprite.Pal(col)].DrawCol;
			
			SpritePlot(edit,prev,x,y,c);
		}

		private void SpritePlot(Graphics edit, Graphics prev,
		                        uint x, uint y)
		{
			Color c=m_plugin.Palette[m_sprite.Pal(m_sprite[x,y])].DrawCol;
			
			SpritePlot(edit,prev,x,y,c);
		}
		
		private void SpritePlot(Graphics edit, Graphics prev,
		                        uint x, uint y, Color c)
		{
			SolidBrush p=new SolidBrush(c);
			
			edit.FillRectangle(p,x*m_gridx+1,y*m_gridy+1,m_gridx-1,m_gridy-1);
			prev.FillRectangle(p,1+x*m_sprsize.XAspect,1+y*m_sprsize.YAspect,
							   m_sprsize.XAspect,m_sprsize.YAspect);
		}
		#endregion
				
		// -------------------------------------------------------
		// OVERLAY HANDLING
		// -------------------------------------------------------
		#region Overlay Handling
		
		private void InitialiseOverlay()
		{
			if (m_sprite==null)
			{
				m_overlay=null;
				return;
			}
			
			m_overlay=new uint[m_sprite.Width,m_sprite.Height];
			
			for(uint y=0;y<m_sprite.Height;y++)
				for(uint x=0;x<m_sprite.Width;x++)
					m_overlay[x,y]=TRANS;	
		}

		private void ClearOverlay()
		{
			if (m_overlay==null)
			{
				return;
			}
			
			for(uint y=0;y<m_sprite.Height;y++)
				for(uint x=0;x<m_sprite.Width;x++)
					m_overlay[x,y]=TRANS;	
		}
		
		private void ApplyOverlay()
		{
			for(uint y=0;y<m_sprite.Height;y++)
				for(uint x=0;x<m_sprite.Width;x++)
				{
					if (m_overlay[x,y]!=TRANS)
						m_sprite[x,y]=m_overlay[x,y];
					
					m_overlay[x,y]=TRANS;
				}
		}
		
		private void OverlayFromSprite()
		{
			for(uint y=0;y<m_sprite.Height;y++)
				for(uint x=0;x<m_sprite.Width;x++)
					m_overlay[x,y]=m_sprite[x,y];
		}

		#endregion
		
		// -------------------------------------------------------
		// COPY/PASTE ROUTINES
		// -------------------------------------------------------
		#region Copy/Paste

		private void DrawMarkBox(uint x1, uint y1,uint x2, uint y2)
		{
			RankCoord(ref x1, ref x2);
			RankCoord(ref y1, ref y2);
			
			for(uint x=x1;x<=x2;x++)
			{
				m_overlay[x,y1]=(m_sprite[x,y1]+1)%m_plugin.MaxColours;
				m_overlay[x,y2]=(m_sprite[x,y2]+1)%m_plugin.MaxColours;
			}

			for(uint y=y1;y<=y2;y++)
			{
				m_overlay[x1,y]=(m_sprite[x1,y]+1)%m_plugin.MaxColours;
				m_overlay[x2,y]=(m_sprite[x2,y]+1)%m_plugin.MaxColours;
			}
		}
		
		private void Copy(uint x1, uint y1, uint x2, uint y2)
		{
			RankCoord(ref x1, ref x2);
			RankCoord(ref y1, ref y2);
			
			m_cpX=x1;
			m_cpY=y1;
			m_cpWidth=x2-x1+1;
			m_cpHeight=y2-y1+1;
			
			m_cpBuff=new uint[m_cpWidth,m_cpHeight];
			
			for(uint x=0;x<m_cpWidth;x++)
				for(uint y=0;y<m_cpHeight;y++)
					m_cpBuff[x,y]=m_sprite[x1+x,y1+y];
			
			m_drawing=false;
			m_cpMenu.Mode=CopyMenu.EMode.eNothing;
		}
		
		private void Paste(int x, int y, bool trans)
		{
			switch (m_cpMenu.Gravity)
			{
				case CopyMenu.EGravity.eTopLeft:
					break;
					
				case CopyMenu.EGravity.eTopRight:
					x-=(int)m_cpWidth;
					break;

				case CopyMenu.EGravity.eBottomLeft:
					y-=(int)m_cpHeight;
					break;

				case CopyMenu.EGravity.eBottomRight:
					x-=(int)m_cpWidth;
					y-=(int)m_cpHeight;
					break;

				case CopyMenu.EGravity.eCentre:
					x-=(int)m_cpWidth/2;
					y-=(int)m_cpHeight/2;
					break;
			}
			
			for(int w=0;w<m_cpWidth;w++)
				for(int h=0;h<m_cpHeight;h++)
					if (!trans || m_cpBuff[w,h]!=0)
						SafePlot(x+w,y+h,m_cpBuff[w,h]);
		}
		
		#endregion
		
		// -------------------------------------------------------
		// DRAWING ROUTINES
		// -------------------------------------------------------
		#region Drawing Routines
		
		private void RankCoord(ref uint c1, ref uint c2)
		{
			if (c1>c2)
			{
				uint t=c2;
				c2=c1;
				c1=t;
			}
		}
		
		private void SafePlot(int x, int y, uint col)
		{
			if (x>=0 && x<m_sprite.Width && y>=0 && y<m_sprite.Height)
				m_overlay[x,y]=col;
		}
		
		private void DrawLine(uint ux1, uint uy1,
		                      uint ux2, uint uy2,
		                      uint col)
		{
			int x1=(int)ux1;;
			int y1=(int)uy1;
			int x2=(int)ux2;
			int y2=(int)uy2;
		
		    int dx=x2-x1;
		    int dy=y2-y1;
		
		    int ix=Math.Sign(dx);
		    int iy=Math.Sign(dy);
		
		    dx=Math.Abs(dx);
		    dy=Math.Abs(dy);
		
		    int incrE;
			int incrNE;
			int d;
			bool ymode;
		
		    if (dy>dx)
			{
				ymode=true;
				d=dx*2-dy;
				incrE=dx*2;
				incrNE=(dx-dy)*2;
			}
		    else
			{
				ymode=false;
				d=dy*2-dx;
				incrE=dy*2;
				incrNE=(dy-dx)*2;
			}
		
		    int x=x1;
		    int y=y1;
		
			SafePlot(x,y,col);
		
		    if (ymode)
		    {
				while(y!=y2)
				{
					if (d<=0)
					{
						d+=incrE;
						y+=iy;
					}
					else
					{
						d+=incrNE;
						y+=iy;
						x+=ix;
					}
		
					SafePlot(x,y,col);
				}
		    }
		    else
		    {
				while(x!=x2)
				{
					if (d<=0)
					{
						d+=incrE;
						x+=ix;
					}
					else
					{
						d+=incrNE;
						y+=iy;
						x+=ix;
					}
		
					SafePlot(x,y,col);
				}
		    }
		}
		
		private void DrawRect(uint x1, uint y1,
		                      uint x2, uint y2,
		                      uint col, bool fill)
		{
			RankCoord(ref x1, ref x2);
			RankCoord(ref y1, ref y2);
			
			if (fill)
			{
				for(uint x=x1;x<=x2;x++)
					for(uint y=y1;y<=y2;y++)
						m_overlay[x,y]=col;
			}
			else
			{
				for(uint x=x1;x<=x2;x++)
				{
					m_overlay[x,y1]=col;
					m_overlay[x,y2]=col;
				}

				for(uint y=y1;y<=y2;y++)
				{
					m_overlay[x1,y]=col;
					m_overlay[x2,y]=col;
				}
			}
		}
		
		private void DrawEllipse(uint originx, uint originy,
		                         uint radpointx, uint radpointy,
		                         uint col, bool circle, bool fill)
		{
			int ox=(int)originx;
			int oy=(int)originy;
			double rx=Math.Abs(ox-(int)radpointx)+1;
			double ry=Math.Abs(oy-(int)radpointy)+1;
			
			if (circle)
			{
				rx=Math.Max(rx,ry);
				ry=rx;
			}
			
			for(double a=0;a<=Math.PI;a+=Math.PI/180)
			{
				int x=(int)(Math.Sin(a)*rx);
				int y=(int)(Math.Cos(a)*ry);
				
				if (fill)
				{
					for(int f=-x;f<=x;f++)
						SafePlot(ox+f,oy+y,col);
				}
				else
				{
					SafePlot(ox+x,oy+y,col);
					SafePlot(ox-x,oy+y,col);
				}
			}
		}
		
		private void FloodFill(uint x, uint y, uint col, uint bg)
		{
			if (m_overlay[x,y]==col || m_overlay[x,y]!=bg)
			{
				return;
			}
			
			m_overlay[x,y]=col;
			
			if (x>0)
				FloodFill(x-1,y,col,bg);
			
			if (y>0)
				FloodFill(x,y-1,col,bg);
			
			if (x<m_sprite.Width-1)
				FloodFill(x+1,y,col,bg);
			
			if (y<m_sprite.Height-1)
				FloodFill(x,y+1,col,bg);
		}

		#endregion
		
		// -------------------------------------------------------
		// CALLBACKS
		// -------------------------------------------------------
		#region Callbacks
		
		void OnDrawMode(object sender, System.EventArgs e)
		{
			m_mode=(Mode)m_modeList.SelectedIndex;
		}
		
		void OnSize(object sender, System.EventArgs e)
		{
			m_sprsize=(SpriteSize)m_size.Items[m_size.SelectedIndex];
			
			if (m_sprite!=null)
			{
				m_undo=new Sprite(m_sprite);
				m_sprite.Resize(m_sprsize.Width,m_sprsize.Height);
				InitialiseOverlay();
			}
			
			m_width=m_sprsize.Width;
			m_height=m_sprsize.Height;

			uint grid=Math.Min((SIZE/m_sprsize.XAspect)/m_width,
			                   (SIZE/m_sprsize.YAspect)/m_height);
			
			m_gridx=grid*m_sprsize.XAspect;
			m_gridy=grid*m_sprsize.YAspect;
			
			m_mx=m_width*m_gridx;
			m_my=m_height*m_gridy;
			
			DrawGrid();
			DrawSprite();
		}

		void OnNameChanged(object sender, System.EventArgs e)
		{
			if (m_sprite!=null)
			{
				m_sprite.Name=m_name.Text;
			}
		}
		
		void OnEnterEditor(object sender, System.EventArgs e)
		{
			//m_inEditor=true;
		}
		
		void OnLeaveEditor(object sender, System.EventArgs e)
		{
			//m_inEditor=false;

			if (m_drawing && m_mode==Mode.ePlot)
			{
				m_undo=new Sprite(m_sprite);
				ApplyOverlay();
			}

			m_drawing=false;

			ClearOverlay();
			DrawSprite();
		}

		void OnPalette(object sender, System.EventArgs e)
		{
			PaletteForm f=new PaletteForm(m_plugin,new Sprite(m_sprite));
			
			if (f.ShowDialog()==DialogResult.OK)
			{
				m_sprite=f.Sprite;
				DrawSprite();
				UpdateColourPreviews();
			}
		}
		
		void OnModeSelect(object sender, System.EventArgs e)
		{
			m_mode=(Mode)m_modeList.SelectedIndex;
		}
		
		void OnUndo(object sender, System.EventArgs e)
		{
			if (m_undo!=null)
			{
				Sprite s=m_sprite;
				Sprite=m_undo;
				m_undo=s;
			}
		}
		
		void OnMouseMove(object sender, System.Windows.Forms.MouseEventArgs e)
		{
			if (m_sprite==null || e.X<0 || e.X>=m_mx || e.Y<0 || e.Y>=m_my)
			{
				return;
			}
			
			uint x;
			uint y;
			
			x=(uint)e.X/m_gridx;
			y=(uint)e.Y/m_gridy;
			
			if (x>=m_sprite.Width || y>=m_sprite.Height)
			{
				return;
			}

			if (e.Button==MouseButtons.None)
			{
				switch(m_mode)
				{
					case Mode.eFloodFill:
						if (m_drawing)
						{
							OverlayFromSprite();
							FloodFill(m_ox,m_oy,m_pen,m_sprite[m_ox,m_oy]);
							m_drawing=false;
							m_undo=new Sprite(m_sprite);
							ApplyOverlay();
							DrawSprite();
						}
						break;
						
					case Mode.eCopyPaste:
						switch(m_cpMenu.Mode)
						{
							case CopyMenu.EMode.eMark:
								if (m_drawing)
								{
									ClearOverlay();
									Copy(m_ox,m_oy,x,y);
									DrawSprite();
									m_drawing=false;
								}
								break;
								
							case CopyMenu.EMode.ePaste:
								ClearOverlay();
								Paste((int)x,(int)y,false);
								DrawSprite();
								break;
								
							case CopyMenu.EMode.ePasteTransparent:
								ClearOverlay();
								Paste((int)x,(int)y,true);
								DrawSprite();
								break;
								
							default:
								break;
						}
						break;
						
					default:
						if (m_drawing)
						{
							m_drawing=false;
							m_undo=new Sprite(m_sprite);
							ApplyOverlay();
							DrawSprite();
						}
						break;
				}
				
				return;
			}
			
			if (!m_drawing)
			{
				m_ox=x;
				m_oy=y;
				m_drawing=true;

				if (e.Button==MouseButtons.Left)
				{
					m_pen=(byte)m_leftCol.Value;
				}
				else
				{
					m_pen=(byte)m_rightCol.Value;
				}
			}

			switch(m_mode)
			{
				case Mode.ePlot:
					m_overlay[x,y]=m_pen;
					DrawSprite();
					break;
					
				case Mode.eLine:
					ClearOverlay();
					DrawLine(m_ox,m_oy,x,y,m_pen);
					DrawSprite();
					break;
					
				case Mode.eRectangle:
					ClearOverlay();
					DrawRect(m_ox,m_oy,x,y,m_pen,false);
					DrawSprite();
					break;
					
				case Mode.eFilledRectangle:
					ClearOverlay();
					DrawRect(m_ox,m_oy,x,y,m_pen,true);
					DrawSprite();
					break;

				case Mode.eCircle:
					ClearOverlay();
					DrawEllipse(m_ox,m_oy,x,y,m_pen,true,false);
					DrawSprite();
					break;
					
				case Mode.eFilledCircle:
					ClearOverlay();
					DrawEllipse(m_ox,m_oy,x,y,m_pen,true,true);
					DrawSprite();
					break;
					
				case Mode.eEllipse:
					ClearOverlay();
					DrawEllipse(m_ox,m_oy,x,y,m_pen,false,false);
					DrawSprite();
					break;
					
				case Mode.eFilledEllipse:
					ClearOverlay();
					DrawEllipse(m_ox,m_oy,x,y,m_pen,false,true);
					DrawSprite();
					break;
					
				case Mode.eFloodFill:
					break;

				case Mode.eCopyPaste:
					if (e.Button==MouseButtons.Right)
					{
						m_cpMenu.AllowPaste=(m_cpBuff!=null);
						m_cpMenu.Show(m_edit,e.X,e.Y);
					}
					else
					{
						switch(m_cpMenu.Mode)
						{
							case CopyMenu.EMode.eMark:
								ClearOverlay();
								DrawMarkBox(m_ox,m_oy,x,y);
								DrawSprite();
								break;
								
							case CopyMenu.EMode.ePaste:
							case CopyMenu.EMode.ePasteTransparent:
								m_undo=new Sprite(m_sprite);
								ApplyOverlay();
								DrawSprite();
								m_drawing=false;
								m_cpMenu.Mode=CopyMenu.EMode.eNothing;
								break;
								
							default:
								break;
						}
					}
					break;
			}
		}
		
		void OnColourChanged(object sender, System.EventArgs e)
		{
			if (m_plugin!=null && m_sprite!=null)
			{
				UpdateColourPreviews();
			}
		}
		
		#endregion
	}
}