基本信息

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   源码介绍

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 实现画图的基本工具，

可以拖动句柄，实现修改，

实现图层的叠加，

using System;
using System.Windows.Forms;
using System.Drawing;


namespace DrawTools
{
	/// <summary>
	/// Base class for all drawing tools
	/// </summary>
	public abstract class Tool
	{

        /// <summary>
        /// Left nous button is pressed
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public virtual void OnMouseDown(DrawArea drawArea, MouseEventArgs e)
        {
        }


        /// <summary>
        /// Mouse is moved, left mouse button is pressed or none button is pressed
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public virtual void OnMouseMove(DrawArea drawArea, MouseEventArgs e)
        {
        }


        /// <summary>
        /// Left mouse button is released
        /// </summary>
        /// <param name="drawArea"></param>
        /// <param name="e"></param>
        public virtual void OnMouseUp(DrawArea drawArea, MouseEventArgs e)
        {
        }
    }
}