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是畫闆，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（确實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，那麼剩下的事就是對坐票了，畫什麼，在那裡畫，怎麼用Draw和Fill了。
下面是在Form上畫了一個小票，然後調用打印組件在虛拟打印機裡打印出來的效果。
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($"時間：{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}", font, brush, 10, y = 20);
var no = "000000000001";
graphics.DrawString($"流水号：{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，用後請釋放。
窗體的浏覽效果：
虛拟打印機輸出的PDF效果圖：
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