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   源码介绍

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适合新手查看学习，

截取全屏图：

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            End = e.Location;
            if (meiju == true)
            {
                if (e.Button == MouseButtons.Left)
                {

                    ima = (Image)bitimag.Clone();
                    g = Graphics.FromImage(ima);
                    g.SmoothingMode = SmoothingMode.AntiAlias;
                    switch (xz)
                    {

                        case xzleiixng.bi:
                            {
                                Pen p1 = new Pen(Color.Black, 2);

                                g.DrawLine(p1, Start.X, Start.Y, End.X, End.Y);
                                Start.X = End.X;
                                Start.Y = End.Y;
                                break;
                            }

                        case xzleiixng.line:
                            {
                                Pen p1 = new Pen(Color.Black, 2);
                                g.DrawLine(p1, Start.X, Start.Y, End.X, End.Y);

                                break;
                            }
                        case xzleiixng.yuan:
                            {

                                Pen p2 = new Pen(Color.Red, 2);
                                g.DrawEllipse(p2, Start.X, Start.Y, End.X - Start.X, End.Y - Start.Y);
                                break;
                            }
                        case xzleiixng.changfxing:
                            {
                                Pen p3 = new Pen(Color.Blue, 2);
                                g.DrawRectangle(p3, Start.X, Start.Y, End.X - Start.X, End.Y - Start.Y);
                                break;
                            }
                        default:
                            break;
                    }
                    reDraw();
                }
            }
        }
        private void reDraw()
        {
            Graphics graphics = pictureBox1.CreateGraphics();
            graphics.DrawImage(ima, new Point(0, 0));
            graphics.Dispose();
        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
        {

            meiju = false;
            bitimag = (Bitmap)ima;

        }

        private void yuan_Click(object sender, EventArgs e)
        {

        }

        private void yuan_Click_1(object sender, EventArgs e)
        {
            xz = xzleiixng.yuan;
        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            xz = xzleiixng.line;
        }

        private void bi_Click(object sender, EventArgs e)
        {
            xz = xzleiixng.bi;
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            xz = xzleiixng.changfxing;
        }

        private void toolStripButton3_Click(object sender, EventArgs e)
        {

        }

        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "JPG|*.jpg|Bmp|*.bmp|所有文件|*.*";
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {

                Image pic = Image.FromFile(openFileDialog1.FileName);
              // pictureBox1.Width = pic.Width;
                //pictureBox1.Height = pic.Height;

                
                pictureBox1.Image = System.Drawing.Bitmap.FromFile(openFileDialog1.FileName);
            }

        }