winform自定义控件（gdi+）——测量文本大小（MeasureString）

1、MeasureString(String, Font)
代码：

   string measureString = “Measure String”;

            Font stringFont1 = new Font(“Arial”, 60);
            SizeF layoutSize = new SizeF(200.0F, 50.0F);

            // Measure string.
            SizeF stringSize = new SizeF();
            stringSize = e.Graphics.MeasureString(measureString, stringFont1);
            // Draw rectangle representing size of string.
            e.Graphics.DrawRectangle(new Pen(Color.Red, 1), 0.0F, 0.0F, stringSize.Width, stringSize.Height);
            // Draw string to screen.
            e.Graphics.DrawString(measureString, stringFont1, Brushes.Black, new PointF(0, 0));

输出：

说明：
测量的大小随着字体的增大而增大。

2、MeasureString(String, Font, SizeF)
代码：

  // Set up string.
            string measureString = “Measure String”;

            Font stringFont1 = new Font(“Arial”, 6);
            SizeF layoutSize = new SizeF(200.0F, 50.0F);

            // Measure string.
            SizeF stringSize = new SizeF();
            stringSize = e.Graphics.MeasureString(measureString, stringFont1, layoutSize);
            // Draw rectangle representing size of string.
            e.Graphics.DrawRectangle(new Pen(Color.Red, 1), 0.0F, 0.0F, stringSize.Width, stringSize.Height);
            // Draw string to screen.
            e.Graphics.DrawString(measureString, stringFont1, Brushes.Black, new PointF(0, 0));

            Font stringFont2 = new Font(“Arial”, 16);
            stringSize = e.Graphics.MeasureString(measureString, stringFont2, layoutSize);
            // Draw rectangle representing size of string.
            e.Graphics.DrawRectangle(new Pen(Color.Red, 1), 0, 100F, stringSize.Width, stringSize.Height);
            // Draw string to screen.
            e.Graphics.DrawString(measureString, stringFont2, Brushes.Black, new PointF(0, 100));

            Font stringFont3 = new Font(“Arial”, 56);
            // Set maximum layout size.
            stringSize = e.Graphics.MeasureString(measureString, stringFont3, layoutSize);
            // Draw rectangle representing size of string.
            e.Graphics.DrawRectangle(new Pen(Color.Red, 1), 0.0F, 300F, stringSize.Width, stringSize.Height);
            // Draw string to screen.
            e.Graphics.DrawString(measureString, stringFont3, Brushes.Black, new PointF(0, 30

输出：

说明：
最后一个size指定了文本的最大区域，当字体超出最大区域的时候，矩形就不能包含字体了。

3、MeasureString(String, Font, Int32)
最后一个参数限制宽度，功能和MeasureString(String, Font, SizeF)相同。

4、MeasureString(String, Font, PointF, StringFormat)
代码：

 // Set up string.
            string measureString = “Measure String”;
            Font stringFont = new Font(“Arial”, 16);

            // Set point for upper-left corner of string.
            float x = 50.0F;
            float y = 50.0F;
            PointF ulCorner = new PointF(x, y);

            // Set string format.
            StringFormat newStringFormat = new StringFormat();
            newStringFormat.FormatFlags = StringFormatFlags.DirectionVertical;

            // Measure string.
            SizeF stringSize = new SizeF();
            stringSize = e.Graphics.MeasureString(measureString, stringFont, ulCorner, newStringFormat);

            // Draw rectangle representing size of string.
            e.Graphics.DrawRectangle(new Pen(Color.Red, 1), x, y, stringSize.Width, stringSize.Height);

            // Draw string to screen.
            e.Graphics.DrawString(measureString, stringFont, Brushes.Black, ulCorner, newStringFormat);

输出

说明：可以指定文本格式
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原文链接：https://blog.csdn.net/qq_34059233/article/details/119911808