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

/********************************************************************************************
**********************File Name: GraElement.cs,Version 1.0,8 November 2004*******************
**********************************Author: Mayank Bansal**************************************
** This class mainly defines graphical elements. GraElement class  gets the type of        **
** GraElement to draw and it gets the mode of drawing and gets the existing path on        **
** the bitmap and updates the new path. GraEleWithPen, GraEleWithPenBrush are inherited    **
** from GraElement class. GraEleWithPen class is used to draw Graphical Elements with      **
** Pen (default C# drawing object) like Line. GraEleWithPenBrush is used to draw solid     **
** Graphical Elements like rectangle, ellipse etc which use both pen and brush properties. ** 
**                                                                                         **
**                                                                                         **
********************************************************************************************/
///
using System;
using System.Drawing;
using System.Drawing.Drawing2D;

using GraEditor.BaseDef;

// Namespace Elements, include GraElemetn,GraEleWithPen,GraEleWithPenBrush,LineGra,LinesGra,RectGra,EllipseGra,TextGra,ImageGra,
namespace GraEditor.Elements
{
	
	[Flags]

	// Two drawing mode: frame and solid
	public enum  GraDrawMode 
	{
		Frame = 0x01,
		Fill = 0x02
	}

	//6 types drawing element: Line,Lines,Rect,Ellipse,Text,Image.
	public enum GraEleType 
	{
		Line,
        Arrow,
		Lines,
		Rect,
		Ellipse,
		Text,
		Image
	}

	//Abstract class, which is defined for graph element. 
	//The GraEleWithPen(), ImageGra() and GraEleWithPenBrush() will inherit from this class.
	public abstract class GraElement
	{
		
		public GraElement()
		{
			//public path variable of GraElement,which save the path of graphic element
			this.path = new GraphicsPath();
		}
		

		protected  GraDrawMode  drawMode;//specify the draw mode: frame or fill

		//Draw Mode property of GraElement
		public   GraDrawMode  DrawMode
		{
			get { return drawMode; }   
			set { drawMode = value; }  
		}

		//specify the graph element type:Line or Line or Rect or Ellipse or Text or Image.
		public abstract GraEleType  Type
		{
			get;
		}

		protected GraphicsPath  path;//protected path variable of GraElement

		//Path property of GraElement
		public    GraphicsPath  Path
		{
			get { return path;} //return public path variable of GraElement
		}


		//Reset the path variable
		public virtual void UpdatePath() 
		{
			this.path.Reset();
		}


		//Draw function of GraElement
		public virtual void Draw(Graphics g)
		{
			

			if((this.drawMode & GraDrawMode.Fill) == GraDrawMode.Fill)//draw solid graph
			{
				Brush b = this.BrushExt.Brush;// define a new Brush b,sent the GraElement.BrushExt.Brush to b
				g.FillPath(b,this.path);      //draw graph element with brush b
				
			}
			
			if((this.drawMode & GraDrawMode.Frame) == GraDrawMode.Frame)//draw frame graph
			 {
				 Pen p = this.PenExt.Pen;// define a new Pen,sent the GraElement.PenExt.Pen to p
				 g.DrawPath(p,this.path); //draw graph element with pen p
			 }
		}

		//Pen property of GraElement
		public virtual PenExt  PenExt 
		{
			get { return null;}
			set { }
		}

		//Brush property of GraElement
		public virtual BrushExt  BrushExt 
		{
			get { return null;}
			set { }
		}
	}

	// Abstract class inherit from GraElement(), which will used for drawing line, lines.
	//class LineGra() and LinesGra() inherit from it
	public abstract class  GraEleWithPen :GraElement
	{
		
		public GraEleWithPen(Pen pen) //Set PenExt of GraEleWithPen
		:base()
		{
			this.penExt = new PenExt();
			this.penExt.Pen = pen;

			this.drawMode = GraDrawMode.Frame;
		}

		private  PenExt  penExt; //Private PenExt varible of GraEleWithPen

		//Pen property of GraEleWithPen
		public override  PenExt  PenExt 
		{
			get { return penExt; }
			set { penExt = value;}
		}
	}

	//Abstract class inherit from GraElement(), which will used for drawing rectangle, ellipse, text. 
	//class RectGra(), EllipseGra and TextGra() inherit from it.
	public abstract class GraEleWithPenBrush : GraEleWithPen
	{
		
		//Construction Function of GraEleWithPenBrush.set BrushExt and PenExt of GraEleWithPen.
		//When we draw a solid graph, we will draw the frame of it and then fill the frame.
		public GraEleWithPenBrush(Pen pen, Brush brush,GraDrawMode drawMode)
			:base(pen)
		{
			this.brushExt = new BrushExt();
			this.brushExt.Brush = brush;
			this.drawMode = drawMode;

		}

		protected  BrushExt   brushExt;//Private BrushExt varible of GraEleWithPen

		//Brush property of GraEleWithPenBrush
		public  override  BrushExt   BrushExt
		{
			get { return brushExt; }
			set { brushExt = value;}
		}
	}
}