winform零基础教程(WinForm十二画图)

在.NET中,画图主要是通过Graphics类实现的,这个类主要通过两类方法完成画图,一类是DrawXXX,画各种线条图形;另一类是FillXXX,用各种形状,填充各种图形。Graphics是画板,Draw各个方法是各种盏笔(不过在调用Draw方法时,参数需要一个Pen对象),Fill的各个方法就是种种刷子(确实Fill的方法参数也需要一个Brush对象)。首先要熟悉各个Draw和Fill方法,以及他们的参数,那么剩下的事就是对坐票了,画什么,在那里画,怎么用Draw和Fill了。

下面是在Form上画了一个小票,然后调用打印组件在虚拟打印机里打印出来的效果。

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("黑体", 10); var brush = new SolidBrush(Color.Black); graphics.DrawString("分店:012", font, brush, 10, y = 1); graphics.DrawString("店员:张三", font, brush, 160, y); graphics.DrawString($"时间:{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")}", font, brush, 10, y = 20); var no = "000000000001"; graphics.DrawString($"流水号:{no}", font, brush, 10, y = 20); graphics.DrawLine(new Pen(Color.Black, 2), 10, y = 25, 310, y); graphics.DrawString("名称 数量 单价 金额", font, brush, 10, y = 5); graphics.DrawString("西红柿 500g 26.00 15.00", font, brush, 10, y = 20); graphics.DrawString("西葫芦 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("黑体", 12); graphics.DrawString(" 小计: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转黑白的一个算法,关注画图部分请忽略。

Graphics实现了IDisposable,用后请释放。

窗体的浏览效果:

winform零基础教程(WinForm十二画图)(1)

虚拟打印机输出的PDF效果图:

winform零基础教程(WinForm十二画图)(2)

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