20220315 代码初始化上传

SGGL/FineUIPro.Web/Captcha/CaptchaImage.cs

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+using System;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+using System.Drawing.Imaging;
+using System.Drawing.Text;
+
+
+namespace CaptchaImage
+{
+    /// <summary>
+    /// 这个生成验证码图片的代码来自：http://www.codeproject.com/KB/aspnet/CaptchaImage.aspx
+    /// </summary>
+    public class CaptchaImage
+    {
+        // Public properties (all read-only).
+        public string Text
+        {
+            get { return this.text; }
+        }
+        public Bitmap Image
+        {
+            get { return this.image; }
+        }
+        public int Width
+        {
+            get { return this.width; }
+        }
+        public int Height
+        {
+            get { return this.height; }
+        }
+
+        // Internal properties.
+        private string text;
+        private int width;
+        private int height;
+        private string familyName;
+        private Bitmap image;
+
+        // For generating random numbers.
+        private Random random = new Random();
+
+        // ====================================================================
+        // Initializes a new instance of the CaptchaImage class using the
+        // specified text, width and height.
+        // ====================================================================
+        public CaptchaImage(string s, int width, int height)
+        {
+            this.text = s;
+            this.SetDimensions(width, height);
+            this.GenerateImage();
+        }
+
+        // ====================================================================
+        // Initializes a new instance of the CaptchaImage class using the
+        // specified text, width, height and font family.
+        // ====================================================================
+        public CaptchaImage(string s, int width, int height, string familyName)
+        {
+            this.text = s;
+            this.SetDimensions(width, height);
+            this.SetFamilyName(familyName);
+            this.GenerateImage();
+        }
+
+        // ====================================================================
+        // This member overrides Object.Finalize.
+        // ====================================================================
+        ~CaptchaImage()
+        {
+            Dispose(false);
+        }
+
+        // ====================================================================
+        // Releases all resources used by this object.
+        // ====================================================================
+        public void Dispose()
+        {
+            GC.SuppressFinalize(this);
+            this.Dispose(true);
+        }
+
+        // ====================================================================
+        // Custom Dispose method to clean up unmanaged resources.
+        // ====================================================================
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+                // Dispose of the bitmap.
+                this.image.Dispose();
+        }
+
+        // ====================================================================
+        // Sets the image width and height.
+        // ====================================================================
+        private void SetDimensions(int width, int height)
+        {
+            // Check the width and height.
+            if (width <= 0)
+                throw new ArgumentOutOfRangeException("width", width, "Argument out of range, must be greater than zero.");
+            if (height <= 0)
+                throw new ArgumentOutOfRangeException("height", height, "Argument out of range, must be greater than zero.");
+            this.width = width;
+            this.height = height;
+        }
+
+        // ====================================================================
+        // Sets the font used for the image text.
+        // ====================================================================
+        private void SetFamilyName(string familyName)
+        {
+            // If the named font is not installed, default to a system font.
+            try
+            {
+                Font font = new Font(this.familyName, 13F);
+                this.familyName = familyName;
+                font.Dispose();
+            }
+            catch (Exception)
+            {
+                this.familyName = System.Drawing.FontFamily.GenericSerif.Name;
+            }
+        }
+
+        // ====================================================================
+        // Creates the bitmap image.
+        // ====================================================================
+        private void GenerateImage()
+        {
+            // Create a new 32-bit bitmap image.
+            Bitmap bitmap = new Bitmap(this.width, this.height, PixelFormat.Format32bppArgb);
+
+            // Create a graphics object for drawing.
+            Graphics g = Graphics.FromImage(bitmap);
+            g.SmoothingMode = SmoothingMode.AntiAlias;
+            Rectangle rect = new Rectangle(0, 0, this.width, this.height);
+
+            // Fill in the background.
+            HatchBrush hatchBrush = new HatchBrush(HatchStyle.SmallConfetti, Color.LightGray, Color.White);
+            g.FillRectangle(hatchBrush, rect);
+
+            // Set up the text font.
+            SizeF size;
+            float fontSize = rect.Height + 1;
+            Font font;
+            // Adjust the font size until the text fits within the image.
+            do
+            {
+                fontSize--;
+                font = new Font(this.familyName, fontSize, FontStyle.Bold);
+                size = g.MeasureString(this.text, font);
+            } while (size.Width > rect.Width);
+
+            // Set up the text format.
+            StringFormat format = new StringFormat
+            {
+                Alignment = StringAlignment.Center,
+                LineAlignment = StringAlignment.Center
+            };
+
+            // Create a path using the text and warp it randomly.
+            GraphicsPath path = new GraphicsPath();
+            path.AddString(this.text, font.FontFamily, (int)font.Style, font.Size, rect, format);
+            float v = 8F;
+            PointF[] points =
+			{
+				new PointF(this.random.Next(rect.Width) / v, this.random.Next(rect.Height) / v),
+				new PointF(rect.Width - this.random.Next(rect.Width) / v, this.random.Next(rect.Height) / v),
+				new PointF(this.random.Next(rect.Width) / v, rect.Height - this.random.Next(rect.Height) / v),
+				new PointF(rect.Width - this.random.Next(rect.Width) / v, rect.Height - this.random.Next(rect.Height) / v)
+			};
+            Matrix matrix = new Matrix();
+            matrix.Translate(0F, 0F);
+            path.Warp(points, rect, matrix, WarpMode.Perspective, 0F);
+
+            // Draw the text.
+            hatchBrush = new HatchBrush(HatchStyle.LargeConfetti, Color.Green, Color.DarkGray);
+            g.FillPath(hatchBrush, path);
+
+            // Add some random noise.
+            int m = Math.Max(rect.Width, rect.Height);
+            for (int i = 0; i < (int)(rect.Width * rect.Height / 30F); i++)
+            {
+                int x = this.random.Next(rect.Width);
+                int y = this.random.Next(rect.Height);
+                int w = this.random.Next(m / 50);
+                int h = this.random.Next(m / 50);
+                g.FillEllipse(hatchBrush, x, y, w, h);
+            }
+
+            // Clean up.
+            font.Dispose();
+            hatchBrush.Dispose();
+            g.Dispose();
+
+            // Set the image.
+            this.image = bitmap;
+        }
+    }
+}