在.NET中，畫圖主要是通過Graphics類實現的，這個類主要通過兩類方法完成畫圖，一類是DrawXXX，畫各種線條圖形；另一類是FillXXX,用各種形狀，填充各種圖形。Graphics是畫板，Draw各個方法是各種盞筆（不過在調用Draw方法時，參數需要一個Pen對象)，Fill的各個方法就是種種刷子（確實Fill的方法參數也需要一個Brush對象）。首先要熟悉各個Draw和Fill方法，以及他們的參數，那么剩下的事就是對坐票了，畫什么，在那里畫，怎么用Draw和Fill了。
下面是在Form上畫了一個小票，然后調用打印組件在虛擬打印機里打印出來的效果。
using QRCoder;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;namespace WinFormsDemo12
{public partial class Form1 : Form{public Form1(){InitializeComponent();}void Draw(Graphics graphics){var y = 15;using var logo = new Bitmap(Directory.GetCurrentDirectory() + "/aeon.png");graphics.DrawImage(MakeGrayscale(logo), 60, y, 200, 80);graphics.DrawLine(new Pen(Color.Black, 2), 10, y += 80, 310, y);graphics.DrawLine(new Pen(Color.Black, 2), 10, y += 4, 310, y);var font = new Font("黑體", 10);var brush = new SolidBrush(Color.Black);graphics.DrawString("分店：012", font, brush, 10, y += 1);graphics.DrawString("店員：張三", font, brush, 160, y);graphics.DrawString($"時間：{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}", font, brush, 10, y += 20);var no = "000000000001";graphics.DrawString($"流水號：{no}", font, brush, 10, y += 20);graphics.DrawLine(new Pen(Color.Black, 2), 10, y += 25, 310, y);graphics.DrawString("名稱 數量 單價 金額", font, brush, 10, y += 5);graphics.DrawString("西紅柿 500g 26.00 15.00", font, brush, 10, y += 20);graphics.DrawString("西葫蘆 1000g 23.00 23.00", font, brush, 10, y += 20);graphics.DrawString("茄子 500g 50.00 25.00", font, brush, 10, y += 20);graphics.DrawString("豆角 500g 38.00 19.00", font, brush, 10, y += 20);graphics.DrawLine(new Pen(Color.Black, 2), 10, y += 20, 310, y);graphics.DrawLine(new Pen(Color.Black, 2), 10, y += 4, 310, y);var sumfont = new Font("黑體", 12);graphics.DrawString(" 小計：82", sumfont, brush, 10, y += 5);var qrCodeAsBitmapByteArr = PngByteQRCodeHelper.GetQRCode(no, QRCodeGenerator.ECCLevel.Q, 20, false);using var qrcode = Image.FromStream(new MemoryStream(qrCodeAsBitmapByteArr));graphics.DrawImage(qrcode, 100, y += 50, 120, 120);}public static Bitmap MakeGrayscale(Bitmap original){var newBitmap = new Bitmap(original.Width, original.Height);var g = Graphics.FromImage(newBitmap);var colorMatrix = new System.Drawing.Imaging.ColorMatrix(new float[][]{new float[] {.3f, .3f, .3f, 0, 0},new float[] {.59f, .59f, .59f, 0, 0},new float[] {.11f, .11f, .11f, 0, 0},new float[] {0, 0, 0, 1, 0},new float[] {0, 0, 0, 0, 1}});var attributes = new System.Drawing.Imaging.ImageAttributes();attributes.SetColorMatrix(colorMatrix);g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height), 0, 0, original.Width, original.Height, GraphicsUnit.Pixel, attributes);g.Dispose();return newBitmap;}???private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e){if (e.Graphics != null){Draw(e.Graphics);}}private void button2_Click(object sender, EventArgs e){printDocument1.Print();}private void button1_Click(object sender, EventArgs e){var graphics = this.CreateGraphics();Draw(graphics);}}
}MakeGrayscale方法是把彩色logo轉黑白的一個算法，關注畫圖部分請忽略。
Graphics實現了IDisposable，用后請釋放。
窗體的瀏覽效果：
虛擬打印機輸出的PDF效果圖：
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