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* init * tweaks
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,97 +1,99 @@ | ||
| using System; | ||
| using System.Drawing; | ||
| using System.Drawing.Imaging; | ||
| using System.IO; | ||
| using System.Linq; | ||
| using SixLabors.Fonts; | ||
| using SixLabors.ImageSharp; | ||
| using SixLabors.ImageSharp.Drawing.Processing; | ||
| using SixLabors.ImageSharp.PixelFormats; | ||
| using SixLabors.ImageSharp.Processing; | ||
|
|
||
| namespace CodeIndex.Server | ||
| { | ||
| public class CaptchaImageUtils | ||
| { | ||
| public static byte[] GenerateCaptchaImage(int width, int height, string captchaCode, Random random) | ||
| { | ||
| using var baseMap = new Bitmap(width, height); | ||
| using var graphics = Graphics.FromImage(baseMap); | ||
| graphics.Clear(GetRandomLightColor(random)); | ||
| DrawCaptchaCode(width, height, captchaCode, random, graphics); | ||
| DrawDisorderLine(random, width, height, graphics); | ||
| AdjustRippleEffect(baseMap); | ||
| var fontSize = GetFontSize(width, captchaCode.Length); | ||
| var fondFamily = SystemFonts.Collection.Families.FirstOrDefault(u => u.Name == "Consolas"); | ||
| fondFamily = fondFamily == default ? SystemFonts.Collection.Families.Last() : fondFamily; | ||
| var font = SystemFonts.CreateFont(fondFamily.Name, fontSize); | ||
|
|
||
| using var ms = new MemoryStream(); | ||
| baseMap.Save(ms, ImageFormat.Png); | ||
| using var image = new Image<Rgba32>(width, height, GetRandomLightColor(random)); | ||
| DrawCaptchaCode(height, captchaCode, fontSize, font, random, image); | ||
| DrawDisorderLine(width, height, image, random); | ||
|
|
||
| using var ms = new MemoryStream(); | ||
| image.SaveAsPng(ms); | ||
| return ms.ToArray(); | ||
| } | ||
|
|
||
| static int GetFontSize(int imageWidth, int captchCodeCount) | ||
| static void DrawCaptchaCode(int height, string captchaCode, int fontSize, Font font, Random random, Image<Rgba32> image) | ||
| { | ||
| var averageSize = imageWidth / captchCodeCount; | ||
| for (int i = 0; i < captchaCode.Length; i++) | ||
| { | ||
| var shiftPx = fontSize / 6; | ||
| var x = random.Next(-shiftPx, shiftPx) + random.Next(-shiftPx, shiftPx); | ||
| if (x < 0 && i == 0) | ||
| { | ||
| x = 0; | ||
| } | ||
|
|
||
| return Convert.ToInt32(averageSize); | ||
| x += i * fontSize; | ||
|
|
||
| var maxY = height - fontSize; | ||
| if (maxY < 0) | ||
| { | ||
| maxY = 0; | ||
| } | ||
|
|
||
| var y = random.Next(0, maxY); | ||
|
|
||
| image.Mutate(operation => operation.DrawText(captchaCode[i].ToString(), font, GetRandomDeepColor(random), new PointF(x, y))); | ||
| } | ||
| } | ||
|
|
||
| static Color GetRandomDeepColor(Random random) | ||
| { | ||
| var redlow = 160; | ||
| var greenLow = 100; | ||
| var blueLow = 160; | ||
| return Color.FromArgb(random.Next(redlow), random.Next(greenLow), random.Next(blueLow)); | ||
| return Color.FromRgb((byte)random.Next(redlow), (byte)random.Next(greenLow), (byte)random.Next(blueLow)); | ||
| } | ||
|
|
||
| static Color GetRandomLightColor(Random random) | ||
| { | ||
| var low = 200; | ||
| var high = 255; | ||
| const int low = 200; | ||
| const int high = 255; | ||
|
|
||
| var nRend = random.Next(high) % (high - low) + low; | ||
| var nGreen = random.Next(high) % (high - low) + low; | ||
| var nBlue = random.Next(high) % (high - low) + low; | ||
|
|
||
| return Color.FromArgb(nRend, nGreen, nBlue); | ||
| return Color.FromRgb((byte)nRend, (byte)nGreen, (byte)nBlue); | ||
| } | ||
|
|
||
| static void DrawCaptchaCode(int width, int height, string captchaCode, Random random, Graphics graphics) | ||
| static int GetFontSize(int imageWidth, int captchCodeCount) | ||
| { | ||
| SolidBrush fontBrush = new SolidBrush(Color.Black); | ||
| var fontSize = GetFontSize(width, captchaCode.Length); | ||
| var font = new Font(FontFamily.GenericSerif, fontSize, FontStyle.Bold, GraphicsUnit.Pixel); | ||
| for (int i = 0; i < captchaCode.Length; i++) | ||
| { | ||
| fontBrush.Color = GetRandomDeepColor(random); | ||
|
|
||
| int shiftPx = fontSize / 6; | ||
|
|
||
| var x = i * fontSize + random.Next(-shiftPx, shiftPx) + random.Next(-shiftPx, shiftPx); | ||
| var maxY = height - fontSize; | ||
| if (maxY < 0) | ||
| { | ||
| maxY = 0; | ||
| } | ||
|
|
||
| var y = random.Next(0, maxY); | ||
| var averageSize = imageWidth / captchCodeCount; | ||
|
|
||
| graphics.DrawString(captchaCode[i].ToString(), font, fontBrush, x, y); | ||
| } | ||
| return Convert.ToInt32(averageSize); | ||
| } | ||
|
|
||
| static void DrawDisorderLine(Random random, int width, int height, Graphics graphics) | ||
| static void DrawDisorderLine(int width, int height, Image graphics, Random random) | ||
| { | ||
| var linePen = new Pen(new SolidBrush(Color.Black), 3); | ||
| for (int i = 0; i < random.Next(3, 5); i++) | ||
| { | ||
| linePen.Color = GetRandomLightColor(random); | ||
|
|
||
| var linePen = new SolidPen(new SolidBrush(GetRandomLightColor(random)), 3); | ||
| var startPoint = new Point(random.Next(0, width), random.Next(0, height)); | ||
| var endPoint = new Point(random.Next(0, width), random.Next(0, height)); | ||
| graphics.DrawLine(linePen, startPoint, endPoint); | ||
| graphics.Mutate(operation => operation.DrawLine(linePen, startPoint, endPoint)); | ||
|
|
||
| //var bezierPoint1 = new Point(random.Next(0, width), random.Next(0, height)); | ||
| //var bezierPoint2 = new Point(random.Next(0, width), random.Next(0, height)); | ||
| //graphics.DrawBezier(linePen, startPoint, bezierPoint1, bezierPoint2, endPoint); | ||
| //var bezierPoint3 = new Point(random.Next(0, width), random.Next(0, height)); | ||
| //var bezierPoint4 = new Point(random.Next(0, width), random.Next(0, height)); | ||
| //graphics.Mutate(operation => operation.DrawBeziers(linePen, bezierPoint1, bezierPoint2, bezierPoint3, bezierPoint4)); | ||
| } | ||
| } | ||
|
|
||
| static void AdjustRippleEffect(Bitmap baseMap) | ||
| { | ||
| } | ||
| } | ||
| } | ||
| } |
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