模仿MFC实现简单画图程序

 CDocument.cs

using System;
using System.Collections.Generic;
using System.Text;

using System.Collections;

namespace CsharpWinTest
...{
    public class CDocument
    ...{
        ArrayList _myGlyphs = new ArrayList();

        public ArrayList MyGlyphs
        ...{
            get ...{ return _myGlyphs; }
        }

        public void AddGlyph(GraphicsObject.Glyph glyph)
        ...{
            _myGlyphs.Add(glyph);
        }
    }
}

CWnd.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using GraphicsObject;

namespace CsharpWinTest
...{
    public partial class CWnd : Form
    ...{
        private CFrameWnd myFram;
        private CWnd()
        ...{
            InitializeComponent();
        }

        public CWnd(CFrameWnd fram)
        ...{
            InitializeComponent();
            myFram = fram;
            MdiParent = fram;
        }

        private void OnPaint(object sender, PaintEventArgs e)
        ...{
            Graphics g = e.Graphics;
            foreach(Glyph o in myFram.TheDoc.MyGlyphs)
                o.Render(g);
        }

        private void CWnd_FormClosed(object sender, FormClosedEventArgs e)
        ...{
            myFram.MyForms.Remove(this);
        }
    }
}

Glyph.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;

namespace GraphicsObject
...{
    public abstract class Glyph
    ...{
        public abstract void Render(Graphics g);
    }

    public class Line : Glyph
    ...{
        private Pen pen;
        private Point p1, p2;

        public Line(Pen p, Point p1, Point p2)
        ...{
            pen = p;
            this.p1 = p1;
            this.p2 = p2;
        }

        public override void Render(Graphics g)
        ...{
            g.DrawLine(pen, p1, p2);
        }
    }

    public class Triangle : Glyph
    ...{
        private Pen pen;
        private Point p1, p2, p3;
        public Triangle(Pen p, Point p1, Point p2, Point p3)
        ...{
            pen = p;
            this.p1 = p1;
            this.p2 = p2;
            this.p3 = p3;
        }

        public override void Render(Graphics g)
        ...{
            g.DrawLine(pen, p1, p2);
            g.DrawLine(pen, p1, p3);
            g.DrawLine(pen, p2, p3);
        }
    }

    public class Circle : Glyph
    ...{
        private Pen pen;
        private Point center;
        private float radius;

        public Circle(Pen p, Point c, float r)
        ...{
            pen = p;
            center = c;
            radius = r;
        }

        public override void Render(Graphics g)
        ...{
            g.DrawEllipse(pen, center.X - (int)radius, center.Y - (int)radius, (int)radius * 2, (int)radius * 2);
        }
    }
}

CFrameWnd.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Collections;
using GraphicsObject;

namespace CsharpWinTest
...{
    public partial class CFrameWnd : Form
    ...{
        private CDocument theDoc;

        ArrayList _myForms = new ArrayList();
        public ArrayList MyForms
        ...{
            get ...{ return _myForms; }
        }

        public void AddForm(CWnd theForm)
        ...{
            _myForms.Add(theForm);
        }

        public CDocument TheDoc
        ...{
            get ...{ return theDoc; }
            set ...{ theDoc = value; }
        }

        public CFrameWnd()
        ...{
            InitializeComponent();
            this.IsMdiContainer = true;

            theDoc = new CDocument();
        }

        private void NewForm_Click(object sender, EventArgs e)
        ...{
            CWnd theForm = new CWnd(this);
            //theForm.Parent = this;
            //theForm.MdiParent = this;
            theForm.Show();
        }

        private void 画线LToolStripMenuItem_Click(object sender, EventArgs e)
        ...{
            Pen p = Pens.Red;
            Line theLine = new Line(p, new Point(10, 20), new Point(40, 100));
            theDoc.MyGlyphs.Add(theLine);
        }

        private void 画三角形TToolStripMenuItem_Click(object sender, EventArgs e)
        ...{
            Pen p = Pens.Green;
            Triangle triangle = new Triangle(p, new Point(100, 10), new Point(10, 100), new Point(200, 80));
            theDoc.MyGlyphs.Add(triangle);
        }

        private void 画圆CToolStripMenuItem_Click(object sender, EventArgs e)
        ...{
            Pen p = Pens.Blue;
        }
    }
}