CAD

开发平台：
C#

DrawObject.cs：源码内容
							using System;
using System.Windows.Forms;
using System.Drawing;
using System.Diagnostics;
using System.Globalization;
using System.Runtime.Serialization;
namespace DrawTools
{
	/// <summary>
	/// Base class for all draw objects
	/// </summary>
	abstract class DrawObject
	{
        #region Members
        // Object properties
        private bool selected;
        private Color color;
        private int penWidth;
        // Allows to write Undo - Redo functions and don't care about
        // objects order in the list.
        int id;   
        // Last used property values (may be kept in the Registry)
        private static Color lastUsedColor = Color.Black;
        private static int lastUsedPenWidth = 1;
        // Entry names for serialization
        private const string entryColor = "Color";
        private const string entryPenWidth = "PenWidth";
        #endregion
        public DrawObject()
        {
            id = this.GetHashCode();
        }
        #region Properties
        /// <summary>
        /// Selection flag
        /// </summary>
        public bool Selected
        {
            get
            {
                return selected;
            }
            set
            {
                selected = value;
            }
        }
        /// <summary>
        /// Color
        /// </summary>
        public Color Color
        {
            get
            {
                return color;
            }
            set
            {
                color = value;
            }
        }
        /// <summary>
        /// Pen width
        /// </summary>
        public int PenWidth
        {
            get
            {
                return penWidth;
            }
            set
            {
                penWidth = value;
            }
        }
        /// <summary>
        /// Number of handles
        /// </summary>
        public virtual int HandleCount
        {
            get
            {
                return 0;
            }
        }
        /// <summary>
        /// Object ID
        /// </summary>
        public int ID
        {
            get { return id; }
            set { id = value; }
        }
        /// <summary>
        /// Last used color
        /// </summary>
        public static Color LastUsedColor
        {
            get
            {
                return lastUsedColor;
            }
            set
            {
                lastUsedColor = value;
            }
        }
        /// <summary>
        /// Last used pen width
        /// </summary>
        public static int LastUsedPenWidth
        {
            get
            {
                return lastUsedPenWidth;
            }
            set
            {
                lastUsedPenWidth = value;
            }
        }
        #endregion
        #region Virtual Functions
        /// <summary>
        /// Clone this instance.
        /// </summary>
        public abstract DrawObject Clone();
        /// <summary>
        /// Draw object
        /// </summary>
        /// <param name="g"></param>
        public virtual void Draw(Graphics g)
        {
        }
        /// <summary>
        /// Get handle point by 1-based number
        /// </summary>
        /// <param name="handleNumber"></param>
        /// <returns></returns>
        public virtual Point GetHandle(int handleNumber)
        {
            return new Point(0, 0);
        }
        /// <summary>
        /// Get handle rectangle by 1-based number
        /// </summary>
        /// <param name="handleNumber"></param>
        /// <returns></returns>
        public virtual Rectangle GetHandleRectangle(int handleNumber)
        {
            Point point = GetHandle(handleNumber);
            return new Rectangle(point.X - 3, point.Y - 3, 7, 7);
        }
        /// <summary>
        /// Draw tracker for selected object
        /// </summary>
        /// <param name="g"></param>
        public virtual void DrawTracker(Graphics g)
        {
            if ( ! Selected )
                return;
            SolidBrush brush = new SolidBrush(Color.Black);
            for ( int i = 1; i <= HandleCount; i++ )
            {
                g.FillRectangle(brush, GetHandleRectangle(i));
            }
            brush.Dispose();
        }
        /// <summary>
        /// Hit test.
        /// Return value: -1 - no hit
        ///                0 - hit anywhere
        ///                > 1 - handle number
        /// </summary>
        /// <param name="point"></param>
        /// <returns></returns>
        public virtual int HitTest(Point point)
        {
            return -1;
        }
        /// <summary>
        /// Test whether point is inside of the object
        /// </summary>
        /// <param name="point"></param>
        /// <returns></returns>
        protected virtual bool PointInObject(Point point)
        {
            return false;
        }
        
        /// <summary>
        /// Get cursor for the handle
        /// </summary>
        /// <param name="handleNumber"></param>
        /// <returns></returns>
        public virtual Cursor GetHandleCursor(int handleNumber)
        {
            return Cursors.Default;
        }
        /// <summary>
        /// Test whether object intersects with rectangle
        /// </summary>
        /// <param name="rectangle"></param>
        /// <returns></returns>
        public virtual bool IntersectsWith(Rectangle rectangle)
        {
            return false;
        }
        /// <summary>
        /// Move object
        /// </summary>
        /// <param name="deltaX"></param>
        /// <param name="deltaY"></param>
        public virtual void Move(int deltaX, int deltaY)
        {
        }
        /// <summary>
        /// Move handle to the point
        /// </summary>
        /// <param name="point"></param>
        /// <param name="handleNumber"></param>
        public virtual void MoveHandleTo(Point point, int handleNumber)
        {
        }
        /// <summary>
        /// Dump (for debugging)
        /// </summary>
        public virtual void Dump()
        {
            Trace.WriteLine(this.GetType().Name);
            Trace.WriteLine("Selected = " + 
                selected.ToString(CultureInfo.InvariantCulture)
                + " ID = " + id.ToString(CultureInfo.InvariantCulture));
        }
        /// <summary>
        /// Normalize object.
        /// Call this function in the end of object resizing.
        /// </summary>
        public virtual void Normalize()
        {
        }
        /// <summary>
        /// Save object to serialization stream
        /// </summary>
        /// <param name="info"></param>
        /// <param name="orderNumber"></param>
        public virtual void SaveToStream(SerializationInfo info, int orderNumber)
        {
            info.AddValue(
                String.Format(CultureInfo.InvariantCulture,
                    "{0}{1}",
                    entryColor, orderNumber),
                Color.ToArgb());
            info.AddValue(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryPenWidth, orderNumber),
                PenWidth);
        }
        /// <summary>
        /// Load object from serialization stream
        /// </summary>
        /// <param name="info"></param>
        /// <param name="orderNumber"></param>
        public virtual void LoadFromStream(SerializationInfo info, int orderNumber)
        {
            int n = info.GetInt32(
                String.Format(CultureInfo.InvariantCulture,
                    "{0}{1}",
                    entryColor, orderNumber));
            Color = Color.FromArgb(n);
            PenWidth = info.GetInt32(
                String.Format(CultureInfo.InvariantCulture,
                "{0}{1}",
                entryPenWidth, orderNumber));
            id = this.GetHashCode();
        }
        #endregion
        #region Other functions
        /// <summary>
        /// Initialization
        /// </summary>
        protected void Initialize()
        {
            color = lastUsedColor;
            penWidth = LastUsedPenWidth;
        }
        /// <summary>
        /// Copy fields from this instance to cloned instance drawObject.
        /// Called from Clone functions of derived classes.
        /// </summary>
        protected void FillDrawObjectFields(DrawObject drawObject)
        {
            drawObject.selected = this.selected;
            drawObject.color = this.color;
            drawObject.penWidth = this.penWidth;
            drawObject.ID = this.ID;
        }
        #endregion
    }
}

						