Calculate the display width of a string in Java

Question

How to calculate the length  in pixels  of a string in Java   Preferable without using Swing   EDIT  I would like to draw the string using the drawString   in Java2D  and use the length for word wrapping

User · Accepted Answer

If you just want to use AWT  then use Graphics getFontMetrics  optionally specifying the font  for a non-default one  to get a FontMetrics and then FontMetrics stringWidth to find the width for the specified string   For example  if you have a Graphics variable called g  you d use   int width   g getFontMetrics   stringWidth text     For other toolkits  you ll need to give us more information - it s always going to be toolkit-dependent

User · Answer

It doesn t always need to be toolkit-dependent or one doesn t always need use the FontMetrics approach since it requires one to first obtain a graphics object which is absent in a web container or in a headless enviroment   I have tested this in a web servlet and it does calculate the text width   import java awt Font  import java awt font FontRenderContext  import java awt geom AffineTransform        String text    Hello World   AffineTransform affinetransform   new AffineTransform         FontRenderContext frc   new FontRenderContext affinetransform true true        Font font   new Font  Tahoma   Font PLAIN  12   int textwidth    int  font getStringBounds text  frc  getWidth     int textheight    int  font getStringBounds text  frc  getHeight         Add the necessary values to these dimensions to create any required margin

User · Answer

I personally was searching for something to let me compute the multiline string area  so I could determine if given area is big enough to print the string - with preserving specific font  private static Hashtable hash   new Hashtable    private Font font  private LineBreakMeasurer lineBreakMeasurer  private int start  end   public PixelLengthCheck Font font        this font   font     public boolean tryIfStringFits String textToMeasure  Dimension areaToFit        AttributedString attributedString   new AttributedString textToMeasure  hash       attributedString addAttribute TextAttribute FONT  font       AttributedCharacterIterator attributedCharacterIterator               attributedString getIterator        start   attributedCharacterIterator getBeginIndex        end   attributedCharacterIterator getEndIndex         lineBreakMeasurer   new LineBreakMeasurer attributedCharacterIterator              new FontRenderContext null  false  false         float width    float  areaToFit width      float height   0      lineBreakMeasurer setPosition start        while  lineBreakMeasurer getPosition    lt  end            TextLayout textLayout   lineBreakMeasurer nextLayout width           height    textLayout getAscent            height    textLayout getDescent     textLayout getLeading               boolean res   height  lt   areaToFit getHeight         return res

User · Answer

And now for something completely different  The following assumes arial font  and makes a wild guess based on a linear interpolation of character vs width      Returns the size in PICA of the string  given space is 200 and  W  is 1000     see https   p2p wrox com access 32197-calculate-character-widths html  static int picaSize String s           the following characters are sorted by width in Arial font     String lookup              jl   i-  JfIt     sr a  ce gFzLxkP 0123456789 lt   gt  qvy SbduEphonTBCXY VRKZN GUAHD OQ amp wmMW       int result   0      for  int i   0  i  lt  s length      i                int c   lookup indexOf s charAt i            result     c  lt  0   60   c    7   200            return result      Interesting  but perhaps not very practical

User · Answer

Use the getWidth method in the following class   import java awt    import java awt geom    import java awt font     class StringMetrics      Font font    FontRenderContext context     public StringMetrics Graphics2D g2         font   g2 getFont        context   g2 getFontRenderContext           Rectangle2D getBounds String message         return font getStringBounds message  context          double getWidth String message         Rectangle2D bounds   getBounds message       return bounds getWidth           double getHeight String message         Rectangle2D bounds   getBounds message       return bounds getHeight

User · Answer

And now for something completely different  The following assumes arial font  and makes a wild guess based on a linear interpolation of character vs width      Returns the size in PICA of the string  given space is 200 and  W  is 1000     see https   p2p wrox com access 32197-calculate-character-widths html  static int picaSize String s           the following characters are sorted by width in Arial font     String lookup              jl   i-  JfIt     sr a  ce gFzLxkP 0123456789 lt   gt  qvy SbduEphonTBCXY VRKZN GUAHD OQ amp wmMW       int result   0      for  int i   0  i  lt  s length      i                int c   lookup indexOf s charAt i            result     c  lt  0   60   c    7   200            return result      Interesting  but perhaps not very practical

User · Answer

Use the getWidth method in the following class   import java awt    import java awt geom    import java awt font     class StringMetrics      Font font    FontRenderContext context     public StringMetrics Graphics2D g2         font   g2 getFont        context   g2 getFontRenderContext           Rectangle2D getBounds String message         return font getStringBounds message  context          double getWidth String message         Rectangle2D bounds   getBounds message       return bounds getWidth           double getHeight String message         Rectangle2D bounds   getBounds message       return bounds getHeight

User · Answer

It doesn t always need to be toolkit-dependent or one doesn t always need use the FontMetrics approach since it requires one to first obtain a graphics object which is absent in a web container or in a headless enviroment   I have tested this in a web servlet and it does calculate the text width   import java awt Font  import java awt font FontRenderContext  import java awt geom AffineTransform        String text    Hello World   AffineTransform affinetransform   new AffineTransform         FontRenderContext frc   new FontRenderContext affinetransform true true        Font font   new Font  Tahoma   Font PLAIN  12   int textwidth    int  font getStringBounds text  frc  getWidth     int textheight    int  font getStringBounds text  frc  getHeight         Add the necessary values to these dimensions to create any required margin

User · Answer

I personally was searching for something to let me compute the multiline string area  so I could determine if given area is big enough to print the string - with preserving specific font  private static Hashtable hash   new Hashtable    private Font font  private LineBreakMeasurer lineBreakMeasurer  private int start  end   public PixelLengthCheck Font font        this font   font     public boolean tryIfStringFits String textToMeasure  Dimension areaToFit        AttributedString attributedString   new AttributedString textToMeasure  hash       attributedString addAttribute TextAttribute FONT  font       AttributedCharacterIterator attributedCharacterIterator               attributedString getIterator        start   attributedCharacterIterator getBeginIndex        end   attributedCharacterIterator getEndIndex         lineBreakMeasurer   new LineBreakMeasurer attributedCharacterIterator              new FontRenderContext null  false  false         float width    float  areaToFit width      float height   0      lineBreakMeasurer setPosition start        while  lineBreakMeasurer getPosition    lt  end            TextLayout textLayout   lineBreakMeasurer nextLayout width           height    textLayout getAscent            height    textLayout getDescent     textLayout getLeading               boolean res   height  lt   areaToFit getHeight         return res

[java] Calculate the display width of a string in Java

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