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我正在使用 netDXF ( https://netdxf.codeplex.com/ ) 生成用于 AutoCAD 的 DXF 文件。但是，我在正确获取 MText 的宽度方面存在问题。我希望能够定义文本应该适合的宽度，并更改文本的宽度因子（水平挤压它）以使其适合定义的区域。因此，如果我有一个 40 毫米的宽度来容纳文本并且文本是 80 毫米长，那么它需要具有 0.5 的宽度因子。唯一的问题是我不知道如何准确确定文本的宽度。我尝试了以下方法，但未能获得正确的结果：

为什么 Graphics.MeasureString() 返回的数字高于预期？

在不使用图形对象的情况下测量字符串？

http://www.codeproject.com/Articles/2118/Bypass-Graphics-MeasureString-limitations

我附上了我的代码。我基本上是使用三种方法中的每一种打印一条水平线来计算文本宽度并将其与实际文本宽度进行比较。如果我改变字体，我会得到不同的结果。我附上了两张图片。一种使用 Calibri 的代码，另一种使用 Arial。无论我使用什么字体，我都需要将线条放在文本的边缘。

宋体

口径 这是我的代码：

public void TestMethod1()
        {
            Application.SetCompatibleTextRenderingDefault(false);

            //text width in mm
            float textWidth = 40;
            float textHeight = 200;
            string labelText = "HELLO WORLD!";
            TextStyle textStyle = new TextStyle("Calibri");

            DxfDocument dxf = new DxfDocument();
            Layer layer1 = new Layer("layer1");
            layer1.Color = new AciColor(0, 0, 255);
            layer1.Name = "Text";

            MText text1 = new MText(new Vector2(0, 0), textHeight, 0, textStyle);
            text1.Layer = layer1;
            text1.AttachmentPoint = MTextAttachmentPoint.MiddleCenter;

            //Will the text fit in the bounds of the rectangle? If not change width factor so it does.
            Font f = new Font(textStyle.FontName, textHeight);
            Size size = TextRenderer.MeasureText(labelText, f);
            SizeF sizeF = graphicsMeasureString(labelText, f);
            int width = MeasureDisplayStringWidth(labelText, f);

            float widthFactor = Math.Min(1, textWidth / sizeF.Width);
            MTextFormattingOptions mtextOptions = new MTextFormattingOptions(text1.Style);
            //mtextOptions.WidthFactor = widthFactor;
            text1.Write(labelText, mtextOptions);

            //Red, g.MeasureString
            Line line1 = new Line(new Vector2(0 - sizeF.Width / 2, 0), new Vector2(0 + sizeF.Width / 2, 0));
            line1.Color = new AciColor(255, 0, 0);

            //Green, TextRenderer
            Line line2 = new Line(new Vector2(0 - size.Width / 2, 5), new Vector2(0 + size.Width / 2, 5));
            line2.Color = new AciColor(0, 255, 0);

            //Yellow, MeasureDisplayStringWidth
            Line line3 = new Line(new Vector2(0 - width / 2, -5), new Vector2(0 + width / 2, -5));
            line3.Color = new AciColor(255, 255, 0);

            dxf.AddEntity(text1);
            dxf.AddEntity(line1);
            dxf.AddEntity(line2);
            dxf.AddEntity(line3);
            dxf.Save("Text Width Test.dxf");

        }

        public SizeF graphicsMeasureString(string text, Font f)
        {
            Bitmap fakeImage = new Bitmap(1, 1);
            Graphics g = Graphics.FromImage(fakeImage);
            SizeF sizeF = g.MeasureString(text, f, new PointF(100, 0), StringFormat.GenericTypographic);

            return sizeF;
        }

        public int MeasureDisplayStringWidth(string text, Font f)
        {
            Size size = TextRenderer.MeasureText(text, f);
            Bitmap fakeImage = new Bitmap(1, 1);
            Graphics g = Graphics.FromImage(fakeImage);

            System.Drawing.StringFormat format = new System.Drawing.StringFormat();
            System.Drawing.RectangleF rect = new System.Drawing.RectangleF(0, 0, 1000, 1000);
            System.Drawing.CharacterRange[] ranges = { new System.Drawing.CharacterRange(0, text.Length) };
            System.Drawing.Region[] regions = new System.Drawing.Region[1];

            format.SetMeasurableCharacterRanges(ranges);

            regions = g.MeasureCharacterRanges(text, f, rect, format);
            rect = regions[0].GetBounds(g);

            return (int)(rect.Right + 1.0f);
        }
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