lyfz_repos/铂金版源码/LYFZ.PhotoSelectSystem/其它/C#多功能画图板源码/old/code/MainView.cs

/*************************************************************************************************
**************************File Name: MainView.cs, Version 1.0, 8 November 2004********************
*****************************Author: Karthik Janaswami********************************************
**This class mainly represents the functionalities of a panel. This panelis inherited from System 
**Panel.It defines functions which will be used to manage the bitmap and perform zoom in and zoom 
**out operations which will be done on the canvas.
**                                                                                              **
**																								**
*************************************************************************************************/

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Data;
using System.Windows.Forms;

using GraEditor.DrawTools;
using GraEditor.Elements;

namespace GraEditor
{
	/// <summary>
	/// MainView is used to manage the panel.It inherit from panel.
	/// </summary>
	public class MainView : System.Windows.Forms.Panel
	{
		
		private System.ComponentModel.Container components = null;

		static MainView()
		{
			viewBitmap = new Bitmap(2000,2000); //Set the size of bitmap

		}

		public MainView()
		{
			
			InitializeComponent();//Initialize MainView

			this.SetStyle(ControlStyles.UserPaint | ControlStyles.AllPaintingInWmPaint | ControlStyles.DoubleBuffer,
				true);

			//Change Bitmap to Graphics
			this.gViewBitmap = Graphics.FromImage(viewBitmap);
			//gViewBitmap.SmoothingMode = SmoothingMode.HighQuality;

			this.viewMatrix = new Matrix();//Use it for zoom in and zoom out

			

		}
		#region 组件设计器生成的代码
		/// <summary> 
		/// 设计器支持所需的方法 - 不要使用代码编辑器 
		/// 修改此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			components = new System.ComponentModel.Container();
		}
		#endregion
		

		/// <summary> 
		/// clear all the using resource
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		

		private  Graphics   gViewBitmap;

		private Matrix  viewMatrix;//Matrix view for display
		public Matrix   ViewMatrix
		{
			get { return viewMatrix; } 
			set { viewMatrix = value; }
		}

		private  static Bitmap  viewBitmap;//Bitmap view 
		public  static  Bitmap  ViewBitmap
		{
			get { return viewBitmap; }
			//set { this.viewBitmap = value; }
		}

		/// <summary>
		/// Panel OnPaint event
		/// </summary>
		/// <param name="e"></param>
		protected override void OnPaint(PaintEventArgs e)
		{
			this.Draw(e.Graphics); 
		}

		/// <summary>
		/// refresh the MainView
		/// </summary>
		public void UpdateView()
		{
			using(Graphics g = this.CreateGraphics())
			{
				this.Draw(g);
			}
		}

		private void Draw(Graphics g)
		{
			Canvas c = Canvas.Instance;//Get the canvas instance
			
			this.gViewBitmap.Clear(this.BackColor);//refresh mainView by background color
			
			Point pos = this.AutoScrollPosition;//get scroll bar postion
			Matrix m = this.viewMatrix.Clone() as Matrix;//Get the matrix
			m.Translate(pos.X,pos.Y,MatrixOrder.Append);//zoom

			this.gViewBitmap.Transform = m;//Set new matrix to gViewBitmap

			Rectangle  rect = new Rectangle(new Point(0,0),c.Size);

			Region oldClip = this.gViewBitmap.Clip;
			Region newClip = new Region(rect);
			this.gViewBitmap.Clip = newClip;

			//refresh mainView by background color
			using(SolidBrush b = new SolidBrush(c.BackColor))
			{
				this.gViewBitmap.FillRectangle(b,rect);
			}

			c.Draw(gViewBitmap);//Draw on Canvas

			this.gViewBitmap.Clip = oldClip;
			newClip.Dispose();


			
			g.DrawImage(viewBitmap,0,0);//draw the view bitmap buffer to mainview.
		}

		//Zoom view by s times
		public void ScaleView(float s)
		{
			this.viewMatrix.Scale(s,s,MatrixOrder.Append);//Zoom in x and y direction by s times
			this.UpdateViewMatrix();//Update MainView matrix
			
		}

		//Update MainView matrix
		public void UpdateViewMatrix()
		{
			Canvas c = Canvas.Instance;//Get the instance of canvas
			float scale = this.viewMatrix.Elements[0];//Get scale

			Size scaleCanasSize = new Size((int)(c.Size.Width*scale),
				(int)(c.Size.Height*scale));//Canvas size after zoom
			
			this.AutoScrollMinSize = scaleCanasSize;//Get the min position of Scroll
	
			this.UpdateView();//Refresh MainView
		}

		public void  ResetScale()//Reset the scale of MainView
		{
			this.viewMatrix.Reset();//Reset the matrix to orginal
			this.UpdateViewMatrix();//Update Matrix

		}

		//Convert the postion of point ptCanvas to zoom coordiante when zoom in or zoom out
		public Point ConvertCanvasToViewBitmapPt(Point ptCanvas) 
			
		{
			Point[] pts = new Point[]{ ptCanvas };
			this.viewMatrix.TransformPoints(pts);//Convert to new position
			Point pt = pts[0];
			//Point ptView = new Point(pt.X+this.AutoScrollPosition.X,
			//	pt.Y+this.AutoScrollPosition.Y);
			return pt;
		}

		//Convert the postion and size of rectangle rCanvas to zoom coordiante when zoom in or zoom out
		public Rectangle ConvertCanvasToViewBitmapRect(Rectangle rCanvas)
			
		{

			//Convert the start point of rectangle to new position
			Point pt1 = this.ConvertCanvasToViewBitmapPt(rCanvas.Location);

			//Convert the end point of rectangle to new position
			Point pt2 = this.ConvertCanvasToViewBitmapPt(new Point(rCanvas.Right,rCanvas.Bottom));
			Rectangle r = new Rectangle(pt1,new Size(pt2.X-pt1.X,
				pt2.Y-pt1.Y));//Convert the size to new size
			return r;
		}

		//Convert the postion of point ptView to original coordiante
		public Point ConvertViewToCanvasPt(Point ptView)
			
		{
			Point pt = new Point(ptView.X-this.AutoScrollPosition.X,
				ptView.Y-this.AutoScrollPosition.Y);

			Point[] pts = new Point[]{ pt };
			
            //Invert transform from zoom to orginial
			using(Matrix m = this.viewMatrix.Clone())
			{
				m.Invert();
				m.TransformPoints(pts);
				
			}
			return pts[0];
		}

		//Convert the postion and size of rectangle rView to original coordiante
		public Rectangle ConvertViewToCanvasRect(Rectangle rView)
			
		{

			//Convert the start point of rectangle to original coordinate
			Point pt1 = this.ConvertViewToCanvasPt(rView.Location);

			//Convert the end point of rectangle to original coordinate
			Point pt2 = this.ConvertViewToCanvasPt(new Point(rView.Right,rView.Bottom));
			Rectangle r = new Rectangle(pt1,new Size(pt2.X-pt1.X,
				pt2.Y-pt1.Y));//Convert the size to original size
			return r;
		}


		//OnMouseDown event of Panel
		protected override void OnMouseDown(System.Windows.Forms.MouseEventArgs e)
		{
			if((e.Button & MouseButtons.Left ) != MouseButtons.Left)
				return;

			GraDrawTool drawTool = GraDrawToolMgr.Instance.ActiveDrawTool;//Get the active draw tool
			if(drawTool != null)
				drawTool.OnMouseDown(e);//Use the OnMouseDown event of active draw tool to deal with this event
		}

		//OnMouseMove event of Panel
		protected override void OnMouseMove(System.Windows.Forms.MouseEventArgs e)
		{
			GraDrawTool drawTool = GraDrawToolMgr.Instance.ActiveDrawTool;//Get the active draw tool
			if(drawTool != null)
				drawTool.OnMouseMove(e);//Use the OnMouseMove event of active draw tool to deal with this event

			base.OnMouseMove(e);
		}

		//OnMouseUp event of Panel
		protected override void OnMouseUp(System.Windows.Forms.MouseEventArgs e)
		{
			if((e.Button & MouseButtons.Left ) != MouseButtons.Left)
				return;

			GraDrawTool drawTool = GraDrawToolMgr.Instance.ActiveDrawTool;//Get the active draw tool
			if(drawTool != null)
				drawTool.OnMouseUp(e);//Use the OnMouseUp event of active draw tool to deal with this event
		}

		protected override void OnDoubleClick(EventArgs e)
		{
			GraDrawTool drawTool = GraDrawToolMgr.Instance.ActiveDrawTool;//Get the active draw tool
			if(drawTool != null)
				drawTool.OnDoubleClick(e);//Use the OnMouseUp event of active draw tool to deal with this event

		}


		//Pop-up menu of Panel 
		public void contextMenu1_Popup(object sender, System.EventArgs e)
		{
			Point pt = Cursor.Position;//current position of cursor
			pt = this.PointToClient(pt);//convert screen position to panel coordinate
			SelectDrawTool.Instance.ContextMenuMousePos = pt;//Pop-up menu for SelectDrawTool
		}
	}
}