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Update image generator
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@SeriaWei
SeriaWei committed Sep 8, 2023
1 parent 1901d69 commit 0c541b2
Showing 1 changed file with 38 additions and 38 deletions.
76 changes: 38 additions & 38 deletions src/ZKEACMS/Captcha/DefaultImageGenerator.cs
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Expand Up @@ -2,21 +2,19 @@
* Copyright (c) ZKEASOFT. All rights reserved.
* http://www.zkea.net/licenses */

using System;
using Microsoft.AspNetCore.Hosting;
using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.Formats;
using SixLabors.ImageSharp.Formats.Jpeg;
using SixLabors.ImageSharp.Formats.Png;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using System;
using System.IO;
using System.Threading.Tasks;
using System.Numerics;
using SixLabors.ImageSharp.Formats;
using SixLabors.ImageSharp.Formats.Png;
using SixLabors.ImageSharp.Formats.Jpeg;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Hosting;
using System.Threading.Tasks;

namespace ZKEACMS.Captcha
{
Expand All @@ -33,42 +31,48 @@ public DefaultImageGenerator(IWebHostEnvironment webHostEnvironment)
FontFamilies = fontCollection.Families.ToArray();
}
public FontFamily[] FontFamilies { get; set; }
public Color[] TextColor { get; set; } = new Color[] { Color.Blue, Color.Black, Color.Red, Color.Brown, Color.Green };
public Color[] TextColor { get; set; } = new Color[]
{
Color.Blue, Color.Black, Color.Red, Color.Brown, Color.Green, Color.DarkBlue, Color.DarkCyan,
Color.DarkGoldenrod, Color.DarkGray, Color.DarkGreen, Color.DarkKhaki, Color.DarkMagenta, Color.DarkOliveGreen, Color.DarkOrange,Color.DarkOrchid,
Color.DarkRed,Color.DarkSalmon, Color.DarkSeaGreen,Color.DarkSlateBlue,Color.DarkTurquoise,Color.DarkViolet
};
public Color[] DrawLinesColor { get; set; } = new Color[] { Color.LightBlue, Color.LightCoral, Color.LightCyan, Color.LightGray, Color.LightPink, Color.LightSalmon, Color.LightSeaGreen, Color.LightSkyBlue, Color.LightSlateGray, Color.LightSteelBlue };
public float MinLineThickness { get; set; } = 0.7f;
public float MaxLineThickness { get; set; } = 2.0f;
public ushort Width { get; set; } = 200;
public ushort Height { get; set; } = 70;
public ushort NoiseRate { get; set; } = 30;
public ushort Width { get; set; } = 100;
public ushort Height { get; set; } = 35;
public ushort NoiseRate { get; set; } = 20;
public Color[] NoiseRateColor { get; set; } = new Color[] { Color.LightBlue, Color.LightCoral, Color.LightCyan, Color.LightGray, Color.LightPink, Color.LightSalmon, Color.LightSeaGreen, Color.LightSkyBlue, Color.LightSlateGray, Color.LightSteelBlue };
public byte FontSize { get; set; } = 45;
public byte FontSize { get; set; } = 25;
public FontStyle FontStyle { get; set; } = FontStyle.Regular;
public EncoderTypes EncoderType { get; set; } = EncoderTypes.Jpeg;
public IImageEncoder Encoder { get { return GetEncoder(EncoderType); } }
public byte DrawLines { get; set; } = 5;
public byte MaxRotationDegrees { get; set; } = 5;

private Random _random { get; set; } = new Random(DateTime.Now.Microsecond);

public byte[] Generate(string text)
{
byte[] result;

using (var imgText = new Image<Rgba32>(Width, Height))
{
float position = 0;
Random random = new Random();
byte startWith = (byte)random.Next(5, 10);
byte startWith = (byte)_random.Next(0, 10);
imgText.Mutate(ctx => ctx.BackgroundColor(Color.Transparent));
FontFamily fontFamily = FontFamilies[random.Next(0, FontFamilies.Length)];
Font font = new Font(fontFamily, FontSize, FontStyle);
var fontFamily = FontFamilies[_random.Next(0, FontFamilies.Length)];
var font = new Font(fontFamily, FontSize, FontStyle);

foreach (char c in text)
{
var location = new PointF(startWith + position, random.Next(6, 13));
imgText.Mutate(ctx => ctx.DrawText(c.ToString(), font, TextColor[random.Next(0, TextColor.Length)], location));
var location = new PointF(startWith + position, _random.Next(0, 13));
imgText.Mutate(ctx => ctx.DrawText(c.ToString(), font, TextColor[_random.Next(0, TextColor.Length)], location));
position += TextMeasurer.MeasureSize(c.ToString(), new TextOptions(font)).Width;
}

AffineTransformBuilder rotation = GetRotation();
var rotation = GetRotation();
imgText.Mutate(ctx => ctx.Transform(rotation));

ushort size = (ushort)TextMeasurer.MeasureSize(text, new TextOptions(font)).Width;
Expand All @@ -77,32 +81,32 @@ public byte[] Generate(string text)

Parallel.For(0, DrawLines, i =>
{
int x0 = random.Next(0, random.Next(0, 30));
int y0 = random.Next(10, img.Height);
int x1 = random.Next(img.Width / 2, img.Width);
int y1 = random.Next(0, img.Height);
int x0 = _random.Next(0, _random.Next(0, 30));
int y0 = _random.Next(10, img.Height);
int x1 = _random.Next(img.Width / 2, img.Width);
int y1 = _random.Next(0, img.Height);
img.Mutate(ctx =>
ctx.DrawLine(TextColor[random.Next(0, TextColor.Length)],
ctx.DrawLine(TextColor[_random.Next(0, TextColor.Length)].WithAlpha(0.5f),
GenerateNextFloat(MinLineThickness, MaxLineThickness),
new PointF[] { new PointF(x0, y0), new PointF(x1, y1) })
);
});

img.Mutate(ctx => ctx.DrawImage(imgText, 0.80f));

Parallel.For(0, NoiseRate, i =>
{
int x0 = random.Next(0, img.Width);
int y0 = random.Next(0, img.Height);
int size = random.Next(2, 8);
int x0 = _random.Next(0, img.Width);
int y0 = _random.Next(0, img.Height);
int size = _random.Next(1, 4);
img.Mutate(
ctx =>
{
ctx.Fill(NoiseRateColor[random.Next(0, NoiseRateColor.Length)], new RectangleF(new PointF(x0, y0), new SizeF(size, size)));
ctx.Fill(NoiseRateColor[_random.Next(0, NoiseRateColor.Length)], new RectangleF(new PointF(x0, y0), new SizeF(size, size)));
}
);
});

img.Mutate(ctx => ctx.DrawImage(imgText, 0.80f));

img.Mutate(x =>
{
x.Resize(Width, Height);
Expand Down Expand Up @@ -136,22 +140,18 @@ public static IImageEncoder GetEncoder(EncoderTypes encoderType)
}
private float GenerateNextFloat(double min = -3.40282347E+38, double max = 3.40282347E+38)
{
Random random = new Random();
double range = max - min;
double sample = random.NextDouble();
double sample = _random.NextDouble();
double scaled = (sample * range) + min;
float result = (float)scaled;
return result;
}

private AffineTransformBuilder GetRotation()
{
Random random = new Random();
var builder = new AffineTransformBuilder();
var width = random.Next(10, Width);
var height = random.Next(10, Height);
var pointF = new PointF(width, height);
var rotationDegrees = random.Next(0, MaxRotationDegrees);
var pointF = new PointF(_random.Next(0, Width), _random.Next(0, Height));
var rotationDegrees = _random.Next(0, MaxRotationDegrees);
var result = builder.PrependRotationDegrees(rotationDegrees, pointF);
return result;
}
Expand Down

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