c#开发技术 画笔

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1 public Line() { } //构造方法2 public 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1 public Rectangle() { } //构造方法2 public 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1 public Square() { } //构造方法2 public 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1 public Circle() { } //构造方法2 public 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1 public Ellipse() { } //构造方法2 public 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_pointList for (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