前言

该画笔程序是自己制作的一个小程序，功能基本完善，但是与专业软件还是存在着一定差距的。该软件具有画直线、矩形、正方形、椭圆、圆、徒手画(随意画)、屏幕写字、屏幕画笔(截屏后在截图上作图)、停止绘图、撤销、重做、设置线宽、设置颜色、放大、缩小、文件另存为(保存)、作图保存为图片、保存用户设置等功能。

界面效果图

图1

部分代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;//添加命名空间
using System.Drawing;
using System.Drawing.Drawing2D;
using System.IO;
using System.Windows.Forms;namespace MyPencil
{//绘图枚举类型public enum DrawType{Stop = 0, Line = 1, Rectangle = 2, Circle = 3, Ellipse = 4, Square = 5, Sketch = 6, Writing = 7}//图形（Shape）抽象基类public abstract class Shape{//类字段private int _penWidth = 10; //画笔线宽private Color _penColor = Color.Red; //画笔颜色//类属性public int _PenWidth { get => _penWidth; set => _penWidth = value; } //画笔线宽public Color _PenColor { get => _penColor; set => _penColor = value; } //画笔颜色//绘制图元方法（抽象方法）public abstract void Draw(Graphics g, DashStyle ds, double zoomRatio);//写入文件方法（抽象方法）public abstract void Write(BinaryWriter bw);//读取文件方法（抽象方法）public abstract void Read(BinaryReader br);}//直线（Line）子类public class Line : Shape{//类字段private Point _p1;//直线的起点private Point _p2;//直线的终点//类属性public Point _P1 { get => _p1; set => _p1 = value; }//直线的起点public Point _P2 { get => _p2; set => _p2 = value; }//直线的终点//构造方法1public Line(){}//构造方法2public Line(Point p1, Point p2){_p1 = p1;_p2 = p2;}//绘制图元方法（覆盖基类抽象方法）public override void Draw(Graphics g, DashStyle ds, double zoomRatio){//创建画笔对象Pen pen = new Pen(_PenColor, (int)(_PenWidth * zoomRatio));//设置画笔线型pen.DashStyle = ds;//获取缩放后的直线的起点、终点坐标Point p1 = new Point((int)(_p1.X * zoomRatio), (int)(_p1.Y * zoomRatio));Point p2 = new Point((int)(_p2.X * zoomRatio), (int)(_p2.Y * zoomRatio));//绘制直线g.DrawLine(pen, p1, p2);}//写入文件方法（覆盖抽象方法）public override void Write(BinaryWriter bw){//写入线宽和颜色bw.Write(_PenWidth);bw.Write(_PenColor.ToArgb());//写入_p1点和_p2点的坐标bw.Write(_p1.X); bw.Write(_p1.Y);bw.Write(_p2.X); bw.Write(_p2.Y);}//读取文件方法（覆盖抽象方法）public override void Read(BinaryReader br){//读出线宽和颜色_PenWidth = br.ReadInt32();_PenColor = Color.FromArgb(br.ReadInt32());//读出_p1点和_p2点的坐标_p1.X = br.ReadInt32(); _p1.Y = br.ReadInt32();_p2.X = br.ReadInt32(); _p2.Y = br.ReadInt32();}}//矩形（Rectangle）子类public class Rectangle :Shape{//类字段private Point _p1;//矩形对角线的第一个点private Point _p2;//矩形对角线的第二个点//类属性public Point _P1 { get => _p1; set => _p1 = value; }//矩形对角线的第一个点public Point _P2 { get => _p2; set => _p2 = value; }//矩形对角线的第二个点//构造方法1public Rectangle(){}//构造方法2public Rectangle(Point p1, Point p2){_p1 = p1;_p2 = p2;}//绘制图元方法（覆盖基类抽象方法）public override void Draw(Graphics g, DashStyle ds, double zoomRatio){//创建画笔对象Pen pen = new Pen(_PenColor, (int)(_PenWidth * zoomRatio));//设置画笔线型pen.DashStyle = ds;//获取缩放后矩形对角线点的坐标Point p1 = new Point((int)(_p1.X * zoomRatio), (int)(_p1.Y * zoomRatio));Point p2 = new Point((int)(_p2.X * zoomRatio), (int)(_p2.Y * zoomRatio));//获取矩形左上角坐标Point leftTop = new Point();leftTop.X = (p1.X <= p2.X) ? p1.X : p2.X;leftTop.Y = (p1.Y <= p2.Y) ? p1.Y : p2.Y;//绘制矩形g.DrawRectangle(pen, leftTop.X, leftTop.Y, Math.Abs(p2.X - p1.X), Math.Abs(p2.Y - p1.Y));}//写入文件方法（覆盖抽象方法）public override void Write(BinaryWriter bw){//写入线宽和颜色bw.Write(_PenWidth);bw.Write(_PenColor.ToArgb());//写入_p1点和_p2点的坐标bw.Write(_p1.X); bw.Write(_p1.Y);bw.Write(_p2.X); bw.Write(_p2.Y);}//读取文件方法（覆盖抽象方法）public override void Read(BinaryReader br){//读出线宽和颜色_PenWidth = br.ReadInt32();_PenColor = Color.FromArgb(br.ReadInt32());//读出_p1点和_p2点的坐标_p1.X = br.ReadInt32(); _p1.Y = br.ReadInt32();_p2.X = br.ReadInt32(); _p2.Y = br.ReadInt32();}}//正方形（Square）子类public class Square : Shape{//类字段private Point _p1;//正方形对角线的第一个点private Point _p2;//正方形对角线的第二个点//类属性public Point _P1 { get => _p1; set => _p1 = value; }//正方形对角线的第一个点public Point _P2 { get => _p2; set => _p2 = value; }//正方形对角线的第二个点//构造方法1public Square(){}//构造方法2public Square(Point p1, Point p2){_p1 = p1;_p2 = p2;}//绘制图元方法（覆盖基类抽象方法）public override void Draw(Graphics g, DashStyle ds, double zoomRatio){//创建画笔对象Pen pen = new Pen(_PenColor, (int)(_PenWidth * zoomRatio));//设置画笔线型pen.DashStyle = ds;//获取缩放后正方形对角线点的坐标Point p1 = new Point((int)(_p1.X * zoomRatio), (int)(_p1.Y * zoomRatio));Point p2 = new Point((int)(_p2.X * zoomRatio), (int)(_p2.Y * zoomRatio));//得到正方形的边长float length = (float)(Math.Sqrt(Math.Pow(p2.X - p1.X, 2) + Math.Pow(p2.Y - p1.Y, 2)) / Math.Sqrt(2));//正方形的固定点Point stablePoint = new Point();//固定点在左上角if(p1.X <= p2.X && p1.Y <= p2.Y){stablePoint.X = p1.X;stablePoint.Y = p1.Y;}//固定点在左下角else if(p1.X <= p2.X && p1.Y >= p2.Y){stablePoint.X = p1.X;stablePoint.Y = (int)(p1.Y - length);}//固定点在右上角else if(p1.X >= p2.X && p1.Y <= p2.Y){stablePoint.X = (int)(p1.X - length);stablePoint.Y = p1.Y;}//固定点在右下角else{stablePoint.X = (int)(p1.X - length);stablePoint.Y = (int)(p1.Y - length);}//绘制正方形g.DrawRectangle(pen, stablePoint.X, stablePoint.Y, length, length) ;}//写入文件方法（覆盖抽象方法）public override void Write(BinaryWriter bw){//写入线宽和颜色bw.Write(_PenWidth);bw.Write(_PenColor.ToArgb());//写入_p1点和_p2点的坐标bw.Write(_p1.X); bw.Write(_p1.Y);bw.Write(_p2.X); bw.Write(_p2.Y);}//读取文件方法（覆盖抽象方法）public override void Read(BinaryReader br){//读出线宽和颜色_PenWidth = br.ReadInt32();_PenColor = Color.FromArgb(br.ReadInt32());//读出_p1点和_p2点的坐标_p1.X = br.ReadInt32(); _p1.Y = br.ReadInt32();_p2.X = br.ReadInt32(); _p2.Y = br.ReadInt32();}}//圆形（Circle）子类public class Circle:Shape{//类字段private Point _pCenter;//圆的中心点;private float _r;//圆的半径//构造方法1public Circle(){}//构造方法2public Circle(Point pCenter, float r){_pCenter = pCenter;_r = r;}//类属性public Point _PCenter { get => _pCenter; set => _pCenter = value; }//圆的中心点;public float _R { get => _r; set => _r = value; }//圆的半径//绘制图元方法（覆盖基类抽象方法）public override void Draw(Graphics g, DashStyle ds, double zoomRatio){//创建画笔对象Pen pen = new Pen(_PenColor, (int)(_PenWidth * zoomRatio));//设置画笔线型pen.DashStyle = ds;//获取缩放后的圆心坐标Point pCenter = new Point((int)(_pCenter.X * zoomRatio), (int)(_pCenter.Y * zoomRatio));//获取缩放后的半径float r = (float)(_r * zoomRatio);//绘制圆g.DrawEllipse(pen, pCenter.X - r, pCenter.Y - r, 2 * r, 2 * r);}//写入文件方法（覆盖抽象方法）public override void Write(BinaryWriter bw){//写入线宽和颜色bw.Write(_PenWidth);bw.Write(_PenColor.ToArgb());//写入中心点坐标和半径bw.Write(_pCenter.X);bw.Write(_pCenter.Y);bw.Write(_r);}//读取文件方法（覆盖抽象方法）public override void Read(BinaryReader br){//读出线宽和颜色_PenWidth = br.ReadInt32();_PenColor = Color.FromArgb(br.ReadInt32());//读出中心点坐标和半径_pCenter.X = br.ReadInt32();_pCenter.Y = br.ReadInt32();_r = br.ReadSingle();}}//椭圆（ellipse)子类public class Ellipse :Shape{//类字段private Point _pCenter;//椭圆的中心点;private float _halfR;//椭圆的半短轴//构造方法1public Ellipse(){}//构造方法2public Ellipse(Point pCenter, float halfR){_pCenter = pCenter;_halfR = halfR;}//类属性public Point _PCenter { get => _pCenter; set => _pCenter = value; }//椭圆的中心点;public float _HalfR { get => _halfR; set => _halfR = value; }//椭圆的半短轴//绘制图元方法（覆盖基类抽象方法）public override void Draw(Graphics g, DashStyle ds, double zoomRatio){//创建画笔对象Pen pen = new Pen(_PenColor, (int)(_PenWidth * zoomRatio));//设置画笔线型pen.DashStyle = ds;//获取缩放后的圆心坐标Point pCenter = new Point((int)(_pCenter.X * zoomRatio), (int)(_pCenter.Y * zoomRatio));//获取缩放后的半径float halfR = (float)(_halfR * zoomRatio);//绘制椭圆g.DrawEllipse(pen, pCenter.X - halfR, pCenter.Y - halfR, 2 * halfR, 3 * halfR);}//写入文件方法（覆盖抽象方法）public override void Write(BinaryWriter bw){//写入线宽和颜色bw.Write(_PenWidth);bw.Write(_PenColor.ToArgb());//写入中心点坐标和半径bw.Write(_pCenter.X);bw.Write(_pCenter.Y);bw.Write(_halfR);}//读取文件方法（覆盖抽象方法）public override void Read(BinaryReader br){//读出线宽和颜色_PenWidth = br.ReadInt32();_PenColor = Color.FromArgb(br.ReadInt32());//读出中心点坐标和半径_pCenter.X = br.ReadInt32();_pCenter.Y = br.ReadInt32();_halfR = br.ReadSingle();}}//草图（Sketch）子类public class Sketch : Shape{//草图的所有点private List<Point> _pointList = new List<Point>();//类属性public List<Point> _PointList{get { return _pointList; }set { _pointList = value; }}//构造方法public Sketch(){}//绘制图元方法（覆盖抽象方法）public override void Draw(Graphics g, DashStyle ds, double zoomRatio){//创建画笔对象Pen pen = new Pen(_PenColor, (int)(_PenWidth * zoomRatio));//设置画笔类型pen.DashStyle = ds;//设置画笔的线帽样式pen.StartCap = LineCap.Round;pen.EndCap = LineCap.Round;pen.LineJoin = LineJoin.Round;g.SmoothingMode = SmoothingMode.AntiAlias;//抗锯齿//绘制Sketch的所有直线段for (int i = 1; i <= _pointList.Count - 1; i++){//Point p1 = new Point((int)(_pointList[i - 1].X * zoomRatio), (int)(_pointList[i - 1].Y * zoomRatio));//Point p2 = new Point((int)(_pointList[i].X * zoomRatio), (int)(_pointList[i].Y * zoomRatio));//g.DrawLine(pen, p1, p2);//创建一个临时列表，用于存储放大后的点坐标List<Point> tempList = new List<Point>();foreach (Point point in _pointList)tempList.Add(new Point((int)(point.X * zoomRatio), ((int)(point.Y * zoomRatio))));g.DrawCurve(pen, tempList.ToArray());}}//写入文件方法（覆盖抽象方法）public override void Write(BinaryWriter binaryWriter){//写入线宽和颜色binaryWriter.Write(_PenWidth);binaryWriter.Write(_PenColor.ToArgb());//写入Sketch的点总数binaryWriter.Write(_pointList.Count());//逐一写入Sketch的点坐标foreach (Point tempPoint in _pointList){binaryWriter.Write(tempPoint.X);binaryWriter.Write(tempPoint.Y);}}//读取文件方法（覆盖抽象方法）public override void Read(BinaryReader binaryReader){//清空_pointList_pointList.Clear();//读出线宽和颜色_PenWidth = binaryReader.ReadInt32();_PenColor = Color.FromArgb(binaryReader.ReadInt32());//读出Sketch的点总数int pointCount = binaryReader.ReadInt32();//逐一读出各点的坐标，并添加到_pointListfor (int i = 0; i <= pointCount - 1; i++){int x = binaryReader.ReadInt32();int y = binaryReader.ReadInt32();Point point = new Point(x, y);_pointList.Add(point);}}}//屏幕写字（WritingFont）子类public class WritingFont : Shape{//字体的样式和大小，类字段private Font _fontStyleSize;//字, 类字段private string _fontText;//字的坐标，类字段private Point _fontLocation;public Font _FontStyleSize { get => _fontStyleSize; set => _fontStyleSize = value; }//类属性public string _FontText { get => _fontText; set => _fontText = value; }//类属性public Point _FontLocation { get => _fontLocation; set => _fontLocation = value; }//类属性//构造方法public WritingFont(){}//绘制图元方法（覆盖抽象方法）public override void Draw(Graphics g, DashStyle ds, double zoomRatio){//绘制字体g.DrawString(_fontText, _fontStyleSize, new SolidBrush(_PenColor), (int)(_fontLocation.X * zoomRatio), (int)(_fontLocation.Y * zoomRatio));}//写入文件方法（覆盖抽象方法）public override void Write(BinaryWriter binaryWriter){//写入大小、样式、颜色、坐标、内容binaryWriter.Write((int)(_fontStyleSize.Size));binaryWriter.Write(_fontStyleSize.FontFamily.Name.ToString());binaryWriter.Write(_PenColor.ToArgb());binaryWriter.Write(_fontLocation.X);binaryWriter.Write(_fontLocation.Y);binaryWriter.Write(_fontText.ToString());}//读取文件方法（覆盖抽象方法）public override void Read(BinaryReader binaryReader){//读取大小、样式、颜色、坐标、内容int size = binaryReader.ReadInt32();string name = binaryReader.ReadString();_fontStyleSize = new Font(name, size, FontStyle.Regular);_PenColor = Color.FromArgb(binaryReader.ReadInt32());_fontLocation.X = binaryReader.ReadInt32();_fontLocation.Y = binaryReader.ReadInt32();_fontText = binaryReader.ReadString();}}
}

完整文件

画笔程序完整文件