Graphics.MeasureCharacterRanges(String, Font, RectangleF, StringFormat) Graphics.MeasureCharacterRanges(String, Font, RectangleF, StringFormat) Graphics.MeasureCharacterRanges(String, Font, RectangleF, StringFormat) Method

Definition

Gets an array of Region objects, each of which bounds a range of character positions within the specified string.

public:
 cli::array <System::Drawing::Region ^> ^ MeasureCharacterRanges(System::String ^ text, System::Drawing::Font ^ font, System::Drawing::RectangleF layoutRect, System::Drawing::StringFormat ^ stringFormat);
public System.Drawing.Region[] MeasureCharacterRanges (string text, System.Drawing.Font font, System.Drawing.RectangleF layoutRect, System.Drawing.StringFormat stringFormat);
member this.MeasureCharacterRanges : string * System.Drawing.Font * System.Drawing.RectangleF * System.Drawing.StringFormat -> System.Drawing.Region[]

Parameters

text
String String String

String to measure.

font
Font Font Font

Font that defines the text format of the string.

layoutRect
RectangleF RectangleF RectangleF

RectangleF structure that specifies the layout rectangle for the string.

stringFormat
StringFormat StringFormat StringFormat

StringFormat that represents formatting information, such as line spacing, for the string.

Returns

Region[]

This method returns an array of Region objects, each of which bounds a range of character positions within the specified string.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, which is a parameter of the Paint event handler. The code performs the following actions:

  • Sets a string "First and Second ranges" and a font for display of the string ("Times New Roman", 16 point).

  • Sets two character ranges within the string (which correspond to the words "First" and "Second").

  • Creates a rectangle in which to display the string.

  • Sets the formatting of the string ¾ including the two character ranges.

  • Draws the string to the screen.

  • Measures the character ranges, determines rectangles that bound the two specified ranges.

  • Draws the two rectangles to the screen.

The result is the displayed string with the first range ("First") bounded by a red rectangle and the second range ("Second") bounded by a blue rectangle.

public:
   void MeasureCharacterRangesRegions( PaintEventArgs^ e )
   {
      // Set up string.
      String^ measureString = "First and Second ranges";
      System::Drawing::Font^ stringFont = gcnew System::Drawing::Font( "Times New Roman",16.0F );

      // Set character ranges to "First" and "Second".
      array<CharacterRange>^ characterRanges = {CharacterRange(0,5),CharacterRange(10,6)};

      // Create rectangle for layout.
      float x = 50.0F;
      float y = 50.0F;
      float width = 35.0F;
      float height = 200.0F;
      RectangleF layoutRect = RectangleF(x,y,width,height);

      // Set string format.
      StringFormat^ stringFormat = gcnew StringFormat;
      stringFormat->FormatFlags = StringFormatFlags::DirectionVertical;
      stringFormat->SetMeasurableCharacterRanges( characterRanges );

      // Draw string to screen.
      e->Graphics->DrawString( measureString, stringFont, Brushes::Black, x, y, stringFormat );

      // Measure two ranges in string.
      array<System::Drawing::Region^>^stringRegions = e->Graphics->MeasureCharacterRanges( measureString, 
	stringFont, layoutRect, stringFormat );

      // Draw rectangle for first measured range.
      RectangleF measureRect1 = stringRegions[ 0 ]->GetBounds( e->Graphics );
      e->Graphics->DrawRectangle( gcnew Pen( Color::Red,1.0f ), Rectangle::Round( measureRect1 ) );

      // Draw rectangle for second measured range.
      RectangleF measureRect2 = stringRegions[ 1 ]->GetBounds( e->Graphics );
      e->Graphics->DrawRectangle( gcnew Pen( Color::Blue,1.0f ), Rectangle::Round( measureRect2 ) );
   }
      private void MeasureCharacterRangesRegions(PaintEventArgs e)
      {

          // Set up string.
          string measureString = "First and Second ranges";
          Font stringFont = new Font("Times New Roman", 16.0F);

          // Set character ranges to "First" and "Second".
          CharacterRange[] characterRanges = { new CharacterRange(0, 5), new CharacterRange(10, 6) };

          // Create rectangle for layout.
          float x = 50.0F;
          float y = 50.0F;
          float width = 35.0F;
          float height = 200.0F;
          RectangleF layoutRect = new RectangleF(x, y, width, height);

          // Set string format.
          StringFormat stringFormat = new StringFormat();
          stringFormat.FormatFlags = StringFormatFlags.DirectionVertical;
          stringFormat.SetMeasurableCharacterRanges(characterRanges);

          // Draw string to screen.
          e.Graphics.DrawString(measureString, stringFont, Brushes.Black, x, y, stringFormat);

          // Measure two ranges in string.
          Region[] stringRegions = e.Graphics.MeasureCharacterRanges(measureString, 
stringFont, layoutRect, stringFormat);

          // Draw rectangle for first measured range.
          RectangleF measureRect1 = stringRegions[0].GetBounds(e.Graphics);
          e.Graphics.DrawRectangle(new Pen(Color.Red, 1), Rectangle.Round(measureRect1));

          // Draw rectangle for second measured range.
          RectangleF measureRect2 = stringRegions[1].GetBounds(e.Graphics);
          e.Graphics.DrawRectangle(new Pen(Color.Blue, 1), Rectangle.Round(measureRect2));
      }
   Private Sub MeasureCharacterRangesRegions(ByVal e As PaintEventArgs)

       ' Set up string.
       Dim measureString As String = "First and Second ranges"
       Dim stringFont As New Font("Times New Roman", 16.0F)

       ' Set character ranges to "First" and "Second".
       Dim characterRanges As CharacterRange() = _
       {New CharacterRange(0, 5), New CharacterRange(10, 6)}

       ' Create rectangle for layout.
       Dim x As Single = 50.0F
       Dim y As Single = 50.0F
       Dim width As Single = 35.0F
       Dim height As Single = 200.0F
       Dim layoutRect As New RectangleF(x, y, width, height)

       ' Set string format.
       Dim stringFormat As New StringFormat
       stringFormat.FormatFlags = StringFormatFlags.DirectionVertical
       stringFormat.SetMeasurableCharacterRanges(characterRanges)

       ' Draw string to screen.
       e.Graphics.DrawString(measureString, stringFont, Brushes.Black, _
       x, y, stringFormat)

       ' Measure two ranges in string.
       Dim stringRegions() As [Region] = e.Graphics.MeasureCharacterRanges(measureString, _
stringFont, layoutRect, stringFormat)

       ' Draw rectangle for first measured range.
       Dim measureRect1 As RectangleF = _
       stringRegions(0).GetBounds(e.Graphics)
       e.Graphics.DrawRectangle(New Pen(Color.Red, 1), _
       Rectangle.Round(measureRect1))

       ' Draw rectangle for second measured range.
       Dim measureRect2 As RectangleF = _
       stringRegions(1).GetBounds(e.Graphics)
       e.Graphics.DrawRectangle(New Pen(Color.Blue, 1), _
       Rectangle.Round(measureRect2))
   End Sub

Remarks

The regions returned by this method are resolution-dependent, so there might be a slight loss of accuracy if strings are recorded in a metafile at one resolution and later played back at a different resolution.

Applies to

See also