NetCore使用SixLabors组件生成图片

主要用到SixLabors.Fonts(2.1.0)和SixLabors.ImageSharp.Drawing(2.1.0)组件

这里我把组件创建成一个单独的类库，供其他模块来同意调用

ISixLaborsExtensions.cs

using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.Processing;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http.Headers;
using System.Text;
using System.Threading.Tasks;

namespace Tzkj.SixLabors
{
    public interface ISixLaborsExtensions
    {
        /// <summary>
        /// 生成会员证书
        /// </summary>
        /// <param name="numX"></param>
        /// <param name="numY"></param>
        /// <param name="nameX"></param>
        /// <param name="nameY"></param>
        /// <param name="yearX"></param>
        /// <param name="yearY"></param>
        /// <param name="mounthX"></param>
        /// <param name="mounthY"></param>
        /// <param name="DayX"></param>
        /// <param name="DayY"></param>
        /// <returns></returns>
        Task<SixLaborOptions> GenerateMembershipCertificateAsync(string companyName, string orderNo, bool isAdd = true, int numX = 700, int numY = 560, int nameX = 540, int nameY = 665, int yearX = 1488, int yearY = 1155,
            int mounthX = 1612, int mounthY = 1155, int DayX = 1706, int DayY = 1155);
    }
}

SixLaborsExtensions.cs

using Org.BouncyCastle.Asn1;
using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.Processing;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Tzkj.Core.Constants;
using Tzkj.Core.System;
using Volo.Abp.DependencyInjection;

namespace Tzkj.SixLabors
{
    public class SixLaborsExtensions : ISixLaborsExtensions, IScopedDependency
    {
        private readonly FontCollection _fontCollection;

        public SixLaborsExtensions(FontCollection fontCollection)
        {
            _fontCollection = fontCollection;
        }

        /// <summary>
        /// 生成会员证书
        /// <paramref name="companyName">名称</param>
        /// <param name="numX"></param>
        /// <param name="numY"></param>
        /// <param name="nameX"></param>
        /// <param name="nameY"></param>
        /// <param name="yearX"></param>
        /// <param name="yearY"></param>
        /// <param name="mounthX"></param>
        /// <param name="mounthY"></param>
        /// <param name="DayX"></param>
        /// <param name="DayY"></param>
        /// <returns></returns>
        public async Task<SixLaborOptions> GenerateMembershipCertificateAsync(string companyName, string orderNo,
            bool isAdd = true,
            int numX = 700, int numY = 560, int nameX = 540, int nameY = 665, int yearX = 1488, int yearY = 1155,
            int mounthX = 1612, int mounthY = 1155, int DayX = 1706, int DayY = 1155)
        {
            using var img = await Image.LoadAsync("wwwroot/robotMember.jpg");
            _fontCollection.TryGet("FangSong", out FontFamily fontFamily);
            string? numberNo = orderNo;
            using var img2 = img.Clone(ctx => ApplyScalingWaterMarkRobot(ctx, fontFamily, Color.Black,
                companyName, orderNo, isAdd, out numberNo, numX, numY, nameX, nameY, yearX, yearY, mounthX, mounthY, DayX, DayY));
            using var memoryStream = new MemoryStream();
            await img2.SaveAsJpegAsync(memoryStream);
            var tt = memoryStream.ToArray();

            return new SixLaborOptions
            {
                ImgBytes = tt,
                CertificateNo = numberNo
            };
        }

        private IImageProcessingContext ApplyScalingWaterMarkRobot(IImageProcessingContext processingContext,
            FontFamily fontFamily, Color color, string companyName, string orderNo, bool isAdd, out string numberNo, int numX = 494, int numY = 528, int nameX = 450, int nameY = 650, int yearX = 650, int yearY = 736,
            int mounthX = 896, int mounthY = 736, int DayX = 990, int DayY = 736)
        {
            var numPoint = new PointF(numX, numY);
            Font numFont = fontFamily.CreateFont(38);
            var numTextOptions = new RichTextOptions(numFont)
            {
                Origin = numPoint
            };
            //processingContext.DrawText(numTextOptions, "HRES20231225001", color);
            numberNo = orderNo;
            if (isAdd)
            {

//参考地址：C# 生成订单号-CSDN博客
                numberNo = GenerateOrderNo.Gener(orderNo,SystemConstants.MemberCardPrefix);
            }

            processingContext.DrawText(numTextOptions, numberNo, color);

            var namePoint = new PointF(nameX, nameY);
            Font nameFont = fontFamily.CreateFont(48);
            var nameTextOptions = new RichTextOptions(nameFont)
            {
                Origin = namePoint
            };
            processingContext.DrawText(nameTextOptions, companyName, color);

            var yearPoint = new PointF(yearX, yearY);
            var monthPoint = new PointF(mounthX, mounthY);
            var dayPoint = new PointF(DayX, DayY);
            Font dateFont = fontFamily.CreateFont(38);

            processingContext
                .DrawText(
                    new RichTextOptions(dateFont)
                    {
                        Origin = yearPoint
                    },
                    "2023",
                    color)
                .DrawText(
                    new RichTextOptions(dateFont)
                    {
                        Origin = monthPoint
                    },
                    "06",
                    color)
                .DrawText(
                    new RichTextOptions(dateFont)
                    {
                        Origin = dayPoint
                    },
                    "26",
                    color);

            return processingContext;
        }
    }
}

SixLaborsModule.cs

using Microsoft.Extensions.DependencyInjection;
using SixLabors.Fonts;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Volo.Abp.Modularity;

namespace Tzkj.SixLabors
{
    public class SixLaborsModule : AbpModule
    {
        public override void ConfigureServices(ServiceConfigurationContext context)
        {
            //var configuration = context.Services.GetConfiguration();

            //图片合成组件单例注入
            context.Services.AddSingleton<FontCollection>(serviceProvider =>
            {
                FontCollection fontCollection = new();
                fontCollection.Add("./wwwroot/Fonts/simfang.ttf");
                //fontCollection.Add(configuration["SixLabors:FontsPath"]);
                return fontCollection;
            });
        }
    }
}

SixLaborOptions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Tzkj.SixLabors
{
    public class SixLaborOptions
    {
        /// <summary>
        /// 证书编号
        /// </summary>
        public string CertificateNo { get; set; }

        /// <summary>
        /// 二进制图片
        /// </summary>
        public byte[] ImgBytes { get; set; }
    }
}

controller.cs

        /// <summary>
        /// 获取会员证书
        /// </summary>
        /// <param name="id">企业id</param>
        /// <returns></returns>
        [HttpGet("get-memberCard")]
        public async Task<IActionResult> GetMemberCardUrlAsync(Guid id)
        {
            byte[] bytes = await _companyInfoService.GetMemberCardUrlAsync(id);
            var qualification = File(bytes, "image/jpeg");

            return qualification;
        }