Change label text font size dynamically based on string length

[vijeta]

Well, I came across a problem in which based on system selected language, my label text will change. This is called Localization in C#/.Net (Localization is a technique to implement local and culture-oriented applications). So if a label string is "Increase" the same string in Bugarian language will be "Увеличаван е на скоростта" .

So what we see from above example, that the text size changes with change in language.

If I want to limit the maximum size in which text should fit, then I need to change the font for that text.

To do so, we need following parameters:

1. Graphics variable
2. Text string - which you want to fit
3. Maximum size in points(Property of Label)- in which text need to fit
4. Default Font

So here is the function:

private Font GetCorrectFont(Graphics graphic, String   text, Size maxStringSize, Font labelFont)
{
  //based on the Label string,we need to vary font size 
  //current width the text string
  SizeF sizeStr = graphic.MeasureString(text, labelFont);
  Font fontStr = new Font(labelFont.Name,labelFont.Size);
  while (sizeStr.Width > maxStringSize.Width)
  {
    //adjust the font size based on width ratio
    float wRatio = (maxStringSize.Width) / sizeStr.Width;
    //reduce the font size
    float newSize = (int)(fontStr.Size * wRatio); 
 //this creates a new font with given fontfamily name
    fontStr = new Font(labelFont.Name, newSize); 
    sizeStr = graphic.MeasureString(text, fontStr);
   }
   return fontStr;
}
 
//Calling convention
//I have a label in my GUI, I need to call this function on "Paint" event
 
private void lblIncrease_Paint(object sender, PaintEventArgs e)
{
 lblIncrease.Font =  GetCorrectFont(e.Graphics, lblIncrease.Text, lblIncrease.MaximumSize, lblIncrease.Font);
}

Note: You have to define the Maximumsize and default font in your label properties.