MainForm.cs

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace Sketchpad
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
            SetStyle(ControlStyles.AllPaintingInWmPaint |
                ControlStyles.UserPaint |
                ControlStyles.OptimizedDoubleBuffer, true);
        }
        private int penwidth = 1;
        private Bitmap bitmap = null;
        private bool dragMode = false;
        private int drawIndex = 1;
        private int curX, curY, x, y, diffX, diffY, xx, yy;
        private Graphics curGraphics;
        private Pen curPen;
        public Cursor curpen { get; set; }
        private SolidBrush curBrush;
        private bool ereaseMode = false;
        public bool quxianMode = false;
        private bool duobianMode = false;
        private Point start;
        private Point end, aaa;
        private string filename;
        public Image newimage;
        private Stack<Bitmap> history, now;
        private Color pencolor = Color.Black;
        public Point[] point = new Point[10];
        public Point[] point1 = new Point[10];
        public int m = 1;//画曲线时用到
        public int n = 1;//输入文字的位置
        public bool writeMode = false;
        public Point write;//写入点的位置
        public bool endmode = true;
        public int a = 0, e, f;
        public int b = 0;
        public int c = 0;
        public int d = 0;
        private bool button = false;//判断橡皮是否开始工作
        private void Form1_Load(object sender, EventArgs e)
        {
            curpen = new Cursor("./pen.cur");
            Cursor = curpen;
            curPen = new Pen(pencolor, penwidth);
            文本框.Visible = false;
            bitmap = new Bitmap(780, 640);
            curGraphics = Graphics.FromImage(bitmap);//budong
            curGraphics.Clear(this.BackColor);
            橡皮擦.Visible = false;
            history = new Stack<Bitmap>();
            now = new Stack<Bitmap>();
        }
        private void Form1_MouseDown(object sender, MouseEventArgs e)