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仿制Windows画图板程序

• 控件
• 代码
• 效果图

控件

新建一个Windows窗体应用程序，将窗体Form1调整到适当大小，在窗体Form1中分别添加1个Panel、1个PictureBox和1个StatusStrip控件，在Panel控件中分别放入3个GroupBox控件，3个GroupBox控件中再分别放入9个Button、5个Button和7个Button控件，添加1个ColorDialog控件，在StatusStrip控件中添加1个ToolStripStatusLabe。

代码

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

namespace 画图板程序
{
    public partial class Form1 : Form
    {
        Graphics g;
        Point pStart, pEnd;         // 定义画图的起始终点
        int ChoiceGraph;            // 所选择图形枚举
        int penWidth;               // 画笔宽度
        enum mySelected
        {
            Pencil,             // 铅笔
            Line,               // 直线
            Ellipse,            // 空心椭圆
            FillEllipse,        // 填充椭圆
            Rec,                // 空心矩形
            FillRec,            // 填充矩形
            Eraser              // 橡皮擦
        };
        public Form1()
        {
            InitializeComponent();
        }

        private void btnNew_Click(object sender, EventArgs e)
        {
            pictureBox1.Refresh();			// 刷新

        }

        private void btnExit_Click(object sender, EventArgs e)
        {
            this.Close();				// 关闭
        }

        private void btnLine1_Click(object sender, EventArgs e)
        {
            //把所有按钮的背景色都设为 White
            btnLine1.BackColor = Color.White;
            btnLine2.BackColor = Color.White;
            btnLine3.BackColor = Color.White;
            btnLine4.BackColor = Color.White;
            btnLine5.BackColor = Color.White;
            ((Button)sender).BackColor = Color.Black;          // 选中的按钮背景色为黑色
            penWidth = Convert.ToInt32(((Button)sender).Tag);   // 将宽度按钮的 Tag 值设为画笔宽度

        }

        private void btnLine2_Click(object sender, EventArgs e)
        {
            //把所有按钮的背景色都设为 White
            btnLine1.BackColor = Color.White;
            btnLine2.BackColor = Color.White;
            btnLine3.BackColor = Color.White;
            btnLine4.BackColor = Color.White;
            btnLine5.BackColor = Color.White;
            ((Button)sender).BackColor = Color.Black;          // 选中的按钮背景色为黑色
            penWidth = Convert.ToInt32(((Button)sender).Tag);   // 将宽度按钮的 Tag 值设为画笔宽度

        }

        private void btnLine3_Click(object sender, EventArgs e)
        {
            //把所有按钮的背景色都设为 White
            btnLine1.BackColor = Color.White;
            btnLine2.BackColor = Color.White;
            btnLine3.BackColor = Color.White;
            btnLine4.BackColor = Color.White;
            btnLine5.BackColor = Color.White;
            ((Button)sender).BackColor = Color.Black;          // 选中的按钮背景色为黑色
            penWidth = Convert.ToInt32(((Button)sender).Tag);   // 将宽度按钮的 Tag 值设为画笔宽度

        }

        private void btnLine4_Click(object sender, EventArgs e)
        {
            //把所有按钮的背景色都设为 White
            btnLine1.BackColor = Color.White;
            btnLine2.BackColor = Color.White;
            btnLine3.BackColor = Color.White;
            btnLine4.BackColor = Color.White;
            btnLine5.BackColor = Color.White;
            ((Button)sender).BackColor = Color.Black;          // 选中的按钮背景色为黑色
            penWidth = Convert.ToInt32(((Button)sender).Tag);   // 将宽度按钮的 Tag 值设为画笔宽度

        }

        private void btnLine5_Click(object sender, EventArgs e)
        {
            //把所有按钮的背景色都设为 White
            btnLine1.BackColor = Color.White;
            btnLine2.BackColor = Color.White;
            btnLine3.BackColor = Color.White;
            btnLine4.BackColor = Color.White;
            btnLine5.BackColor = Color.White;
            ((Button)sender).BackColor = Color.Black;          // 选中的按钮背景色为黑色
            penWidth = Convert.ToInt32(((Button)sender).Tag);   // 将宽度按钮的 Tag 值设为画笔宽度

        }

        private void btnControl_Click(object sender, EventArgs e)
        {
            if (((Button)sender).Text == "C")
            {
                if (colorDialog1.ShowDialog() == DialogResult.OK)
                {
                    btnControl.BackColor = colorDialog1.Color;
                }
            }
            else
            {
                btnControl.BackColor = ((Button)sender).BackColor;
            }

        }

        private void btnRed_Click(object sender, EventArgs e)
        {
            if (((Button)sender).Text == "C")
            {
                if (colorDialog1.ShowDialog() == DialogResult.OK)
                {
                    btnControl.BackColor = colorDialog1.Color;
                }
            }
            else
            {
                btnControl.BackColor = ((Button)sender).BackColor;
            }

        }

        private void btnYellow_Click(object sender, EventArgs e)
        {
            if (((Button)sender).Text == "C")
            {
                if (colorDialog1.ShowDialog() == DialogResult.OK)
                {
                    btnControl.BackColor = colorDialog1.Color;
                }
            }
            else
            {
                btnControl.BackColor = ((Button)sender).BackColor;
            }

        }

        private void btnGreen_Click(object sender, EventArgs e)
        {
            if (((Button)sender).Text == "C")
            {
                if (colorDialog1.ShowDialog() == DialogResult.OK)
                {
                    btnControl.BackColor = colorDialog1.Color;
                }
            }
            else
            {
                btnControl.BackColor = ((Button)sender).BackColor;
            }

        }

        private void btnBlack_Click(object sender, EventArgs e)
        {
            if (((Button)sender).Text == "C")
            {
                if (colorDialog1.ShowDialog() == DialogResult.OK)
                {
                    btnControl.BackColor = colorDialog1.Color;
                }
            }
            else
            {
                btnControl.BackColor = ((Button)sender).BackColor;
            }

        }

        private void btnBlue_Click(object sender, EventArgs e)
        {
            if (((Button)sender).Text == "C")
            {
                if (colorDialog1.ShowDialog() == DialogResult.OK)
                {
                    btnControl.BackColor = colorDialog1.Color;
                }
            }
            else
            {
                btnControl.BackColor = ((Button)sender).BackColor;
            }

        }

        private void btnColorDialog_Click(object sender, EventArgs e)
        {
            if (((Button)sender).Text == "C")
            {
                if (colorDialog1.ShowDialog() == DialogResult.OK)
                {
                    btnControl.BackColor = colorDialog1.Color;
                }
            }
            else
            {
                btnControl.BackColor = ((Button)sender).BackColor;
            }

        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)  // 如果单击鼠标左键，则将当前点坐标赋给起始点
            {
                pStart.X = e.X;
                pStart.Y = e.Y;
            }

        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            toolStripStatusLabel1.Text = "X:" + e.X.ToString() + ",Y:" + e.Y.ToString();

            if (e.Button == MouseButtons.Left)
            {
                switch (ChoiceGraph)
                {
                    case (int)mySelected.Pencil:            // 选择的是铅笔
                        Pen pen1 = new Pen(btnControl.BackColor, penWidth);
                        pEnd.X = e.X;
                        pEnd.Y = e.Y;
                        g.DrawLine(pen1, pStart, pEnd);
                        pStart = pEnd;                      // 将已经绘制的终点作为下一次绘制的起点
                        break;
                    case (int)mySelected.Eraser:
                        Pen pen2 = new Pen(Color.White, penWidth);      // 定义白色画笔作为擦除效果
                        pEnd.X = e.X;
                        pEnd.Y = e.Y;
                        g.DrawLine(pen2, pStart, pEnd);
                        pStart = pEnd;                  // 将已经绘制的终点作为下一次绘制的起点
                        break;
                    default:
                        break;
                }
            }
        }

        private void Change_Point()
        {
            Point pTemp = new Point();          // 定义临时点
            if (pStart.X < pEnd.X)
            {
                if (pStart.Y > pEnd.Y)
                {
                    pTemp.Y = pStart.Y;
                    pStart.Y = pEnd.Y;
                    pEnd.Y = pTemp.Y;
                }
            }
            if (pStart.X > pEnd.X)
            {
                if (pStart.Y < pEnd.Y)
                {
                    pTemp.X = pStart.X;
                    pStart.X = pEnd.X;
                    pEnd.X = pTemp.X;
                }
                if (pStart.Y > pEnd.Y)
                {
                    pTemp = pStart;
                    pStart = pEnd;
                    pEnd = pTemp;
                }
            }
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)          // 如果用户按下的是鼠标左键，记录终点坐标
            {
                pEnd.X = e.X;
                pEnd.Y = e.Y;
                switch (ChoiceGraph)
                {
                    case (int)mySelected.Line:          // 如果选择的是直线
                        Pen pen1 = new Pen(btnControl.BackColor, penWidth);
                        g.DrawLine(pen1, pStart, pEnd);
                        break;
                    case (int)mySelected.Ellipse:       // 如果选择的是空心椭圆
                        Change_Point();
                        Pen pen2 = new Pen(btnControl.BackColor, penWidth);
                        g.DrawEllipse(pen2, pStart.X, pStart.Y, pEnd.X - pStart.X, pEnd.Y - pStart.Y);
                        break;
                    case (int)mySelected.FillEllipse:       // 如果选择的是实心椭圆
                        Change_Point();
                        SolidBrush myBrush1 = new SolidBrush(btnControl.BackColor);
                        Rectangle rec1 = new Rectangle(pStart.X, pStart.Y, pEnd.X - pStart.X
                                                                , pEnd.Y - pStart.Y);
                        g.FillEllipse(myBrush1, rec1);

                        break;
                    case (int)mySelected.Rec:           // 如果选择的是矩形
                        Change_Point();
                        Pen pen3 = new Pen(btnControl.BackColor, penWidth);
                        g.DrawRectangle(pen3, pStart.X, pStart.Y, pEnd.X - pStart.X, pEnd.Y - pStart.Y);
                        break;
                    case (int)mySelected.FillRec:       // 如果选择的是实心矩形
                        Change_Point();
                        SolidBrush myBrush2 = new SolidBrush(btnControl.BackColor);
                        Rectangle rec2 = new Rectangle(pStart.X, pStart.Y, pEnd.X - pStart.X
                                                                , pEnd.Y - pStart.Y);
                        g.FillRectangle(myBrush2, rec2);
                        break;
                    default:
                        break;
                }
            }
        }

        private void btnPencil_Click(object sender, EventArgs e)
        {
            ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
        }

        private void btnLine_Click(object sender, EventArgs e)
        {
            ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
        }

        private void btnEllipse_Click(object sender, EventArgs e)
        {
            ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
        }

        private void btnFillEllipse_Click(object sender, EventArgs e)
        {
            ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
        }

        private void btnRec_Click(object sender, EventArgs e)
        {
            ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
        }

        private void btnFillRec_Click(object sender, EventArgs e)
        {
            ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
        }

        private void btnEraser_Click(object sender, EventArgs e)
        {
            ChoiceGraph = Convert.ToInt32(((Button)sender).Tag);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            g = this.pictureBox1.CreateGraphics();
            ChoiceGraph = (int)mySelected.Pencil;           // 默认选择为铅笔工具
            penWidth = 3;                       // 初始化画笔宽度
            btnControl.BackColor = btnBlack.BackColor;  	// 默认黑色笔
        }

       
    }
}

效果图

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