Csharp dotnet winform label font resize method

Chaleampolpumpotong

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Jan 28, 2021

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private float GetFontSize(Label label, string text,int margin, float min_size, float max_size)
{
  if (text.Length == 0) return min_size;

  int wid = label.DisplayRectangle.Width - margin;
  int hgt = label.DisplayRectangle.Height - margin;

  using (Graphics gr = label.CreateGraphics())
  {
    while (max_size - min_size > 0.1f)
    {
      float pt = (min_size + max_size) / 2f;
      using (Font test_font = new Font(label.Font.FontFamily, pt))
      {
      SizeF text_size = gr.MeasureString(text, test_font);
      if ((text_size.Width > wid) || (text_size.Height > hgt))
        max_size = pt;
      else
        min_size = pt;
      }
    }
    return min_size;
  }
}