src/ZKEACMS/Captcha/DefaultImageGenerator.cs

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/* http://www.zkea.net/ 
 * Copyright (c) ZKEASOFT. All rights reserved. 
 * http://www.zkea.net/licenses */

using System;
using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
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;

namespace ZKEACMS.Captcha
{
    public class DefaultImageGenerator : IImageGenerator
    {
        public DefaultImageGenerator(IWebHostEnvironment webHostEnvironment)
        {
            string fontDir = Path.Combine(webHostEnvironment.WebRootPath, "fonts");
            var fontCollection = new FontCollection();
            foreach (var item in Directory.GetFiles(fontDir, "*.ttf"))
            {
                fontCollection.Add(item);
            }
            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[] 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; } = 300;
        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 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;

        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);
                imgText.Mutate(ctx => ctx.BackgroundColor(Color.Transparent));