使用 System.Drawing 勾勒文本?

问题描述

我有以下代码.有没有一种简单的方法可以给我正在写的文本加上大纲?

I have the following code. Is there an easy way to put an outline on the text I am writing?

 var imageEncoder = Encoder.Quality;
 var imageEncoderParameters = new EncoderParameters(1);
 imageEncoderParameters.Param[0] = new EncoderParameter(imageEncoder, 100L);

 var productImage = GetImageFromByteArray(myViewModel.ProductImage.DatabaseFile.FileContents);
 var graphics = Graphics.FromImage(productImage);

 var font = new Font("Segoe Script", 24);
 var brush = Brushes.Orange;

 var container = new Rectangle(myViewModel.ContainerX, myViewModel.ContainerY,                                      myViewModel.ContainerWidth,                                              myViewModel.ContainerHeight);

 var stringFormat = new StringFormat {Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center};

 graphics.DrawString(customizationText, font, brush, container, stringFormat);

推荐答案

是的.使用以下调用序列代替 DrawString:

Yes. Instead of DrawString, use the following sequence of calls:

• new GraphicsPath(创建一个空的 GraphicsPath)
• GraphicsPath.AddString(GraphicsPath 对象现在表示文本的轮廓)
• Graphics.DrawPath (用你想要的任何 Pen 绘制轮廓)

• new GraphicsPath (creates an empty GraphicsPath)
• GraphicsPath.AddString (the GraphicsPath object now represents the outline of the text)
• Graphics.DrawPath (draws the outline in any Pen you want)

如果您需要将 GraphicsPath.AddString 与 Graphics.DrawString 一起使用，则需要转换字体大小，因为 Graphics.DrawString 需要点大小"而 GraphicsPath.AddString 需要em 大小".转换公式很简单emSize = g.DpiY * pointSize/72.

If you need to use GraphicsPath.AddString alongside Graphics.DrawString, you need to convert the font sizes, because Graphics.DrawString expects "point size" while GraphicsPath.AddString expects "em size". The conversion formula is simply emSize = g.DpiY * pointSize / 72.

这是一个代码示例:

// assuming g is the Graphics object on which you want to draw the text
GraphicsPath p = new GraphicsPath();
p.AddString(
    "My Text String",             // text to draw
    FontFamily.GenericSansSerif,  // or any other font family
    (int) FontStyle.Regular,      // font style (bold, italic, etc.)
    g.DpiY * fontSize / 72,       // em size
    new Point(0, 0),              // location where to draw text
    new StringFormat());          // set options here (e.g. center alignment)
g.DrawPath(Pens.Black, p);
// + g.FillPath if you want it filled as well

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