+ UIVerificationCode: 增加验证码控件

SunnyUI/Controls/UIVerificationCode.cs

@@ -0,0 +1,167 @@
+/******************************************************************************
+ * SunnyUI 开源控件库、工具类库、扩展类库、多页面开发框架。
+ * CopyRight (C) 2012-2022 ShenYongHua(沈永华).
+ * QQ群：56829229 QQ：17612584 EMail：SunnyUI@QQ.Com
+ *
+ * Blog:   https://www.cnblogs.com/yhuse
+ * Gitee:  https://gitee.com/yhuse/SunnyUI
+ * GitHub: https://github.com/yhuse/SunnyUI
+ *
+ * SunnyUI.dll can be used for free under the GPL-3.0 license.
+ * If you use this code, please keep this note.
+ * 如果您使用此代码，请保留此说明。
+ ******************************************************************************
+ * 文件名称: UIVerificationCode.cs
+ * 文件说明: 验证码控件
+ * 当前版本: V3.1
+ * 创建日期: 2022-06-11
+ *
+ * 2022-06-11: V3.1.9 增加文件说明
+******************************************************************************/
+
+using System;
+using System.ComponentModel;
+using System.Drawing;
+using System.Drawing.Drawing2D;
+
+namespace Sunny.UI
+{
+    [DefaultEvent("Click")]
+    [DefaultProperty("Text")]
+    [ToolboxItem(true)]
+    public class UIVerificationCode : UIControl
+    {
+        public UIVerificationCode()
+        {
+            SetStyleFlags();
+            fillColor = UIStyles.Blue.PlainColor;
+            Width = 100;
+            Height = 35;
+        }
+
+        public override void SetStyleColor(UIBaseStyle uiColor)
+        {
+            base.SetStyleColor(uiColor);
+            fillColor = uiColor.PlainColor;
+        }
+
+        protected override void OnClick(EventArgs e)
+        {
+            base.OnClick(e);
+            Invalidate();
+        }
+
+        protected override void OnPaintFill(Graphics g, GraphicsPath path)
+        {
+            base.OnPaintFill(g, path);
+
+            var bmp = CreateImage(RandomEx.RandomChars(CodeLength));
+            g.DrawImage(bmp, Width / 2 - bmp.Width / 2, 1);
+            bmp.Dispose();
+        }
+
+        protected override void OnPaintFore(Graphics g, GraphicsPath path)
+        {
+            if (Text != "") Text = "";
+            //base.OnPaintFore(g, path);
+        }
+
+        [DefaultValue(4)]
+        [Description("验证码长度"), Category("SunnyUI")]
+        public int CodeLength { get; set; } = 4;
+
+        [DefaultValue(18)]
+        [Description("验证码字体大小"), Category("SunnyUI")]
+        public int CodeFontSize { get; set; } = 18;
+
+        [DefaultValue(null)]
+        [Description("验证码文字"), Category("SunnyUI")]
+        public string Code { get; private set; }
+
+        /// <summary>
+        /// 生成图片
+        /// </summary>
+        /// <param name="code">验证码表达式</param>
+        private Bitmap CreateImage(string code)
+        {
+            Font font = new Font(Font.Name, CodeFontSize);
+            Code = code;
+            SizeF sf = GDI.MeasureString(code, font);
+
+            Bitmap image = new Bitmap((int)sf.Width + 16, Height - 2);
+
+            //创建画布
+            Graphics g = Graphics.FromImage(image);
+            Random random = new Random();
+
+            //图片背景色
+            g.Clear(fillColor);
+
+            //画图片背景线
+            for (int i = 0; i < 6; i++)
+            {
+                int x1 = random.Next(image.Width);
+                int x2 = random.Next(image.Width);
+                int y1 = random.Next(image.Height);
+                int y2 = random.Next(image.Height);
+
+                g.DrawLine(Pens.Black, x1, y1, x2, y2);
+            }
+
+            //画图片的前景噪音点
+            for (int i = 0; i < 50; i++)
+            {
+                int x = random.Next(image.Width);
+                int y = random.Next(image.Height);
+                image.SetPixel(x, y, Color.FromArgb(random.Next()));
+            }
+
+            g.DrawString(code, font, rectColor, image.Width / 2 - sf.Width / 2, image.Height / 2 - sf.Height / 2);
+            var imageex = TwistImage(image, true, 5, 5);
+            font.Dispose();
+            image.Dispose();
+            return imageex;
+        }
+
+        ///<summary>
+        ///正弦曲线Wave扭曲图片
+        ///</summary>
+        ///<param name="srcBmp">图片路径</param>
+        ///<param name="bXDir">如果扭曲则选择为True</param>
+        ///<param name="nMultValue">波形的幅度倍数，越大扭曲的程度越高，一般为3</param>
+        ///<param name="dPhase">波形的起始相位，取值区间[0-2*PI)</param>
+        ///<returns></returns>
+        private Bitmap TwistImage(Bitmap srcBmp, bool bXDir, double dMultValue, double dPhase)
+        {
+            Bitmap destBmp = new Bitmap(srcBmp.Width, srcBmp.Height);
+
+            // 将位图背景填充为白色
+            Graphics graph = Graphics.FromImage(destBmp);
+            graph.FillRectangle(new SolidBrush(fillColor), 0, 0, destBmp.Width, destBmp.Height);
+            graph.Dispose();
+            double dBaseAxisLen = bXDir ? (double)destBmp.Height : (double)destBmp.Width;
+            for (int i = 0; i < destBmp.Width; i++)
+            {
+                for (int j = 0; j < destBmp.Height; j++)
+                {
+                    double dx = 0;
+                    dx = bXDir ? (Math.PI * 2 * (double)j) / dBaseAxisLen : (Math.PI * 2 * (double)i) / dBaseAxisLen;
+                    dx += dPhase;
+                    double dy = Math.Sin(dx);
+
+                    // 取得当前点的颜色
+                    int nOldX = 0, nOldY = 0;
+                    nOldX = bXDir ? i + (int)(dy * dMultValue) : i;
+                    nOldY = bXDir ? j : j + (int)(dy * dMultValue);
+                    System.Drawing.Color color = srcBmp.GetPixel(i, j);
+                    if (nOldX >= 0 && nOldX < destBmp.Width && nOldY >= 0 && nOldY < destBmp.Height)
+                    {
+                        destBmp.SetPixel(nOldX, nOldY, color);
+                    }
+                }
+            }
+
+            return destBmp;
+        }
+    }
+}