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Wrap text using Image.Picture.Canvas method

Posted on 2006-06-17
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Last Modified: 2011-10-03
Hi How can i wrap a paragraph using TextOut Command? or if you have any other good suggestion i'll really appriciate to know.  Here's my procedure below. The line   image.Picture.Bitmap.Canvas.TextOut(112  , 200 , _oTable.fieldbyname('ALLERGIE').asstring); contains a text field which i want to display in a wrap manner.

Thanks in advance

procedure TfDiagnosePatient.DrawPageLabelsPatientRecord2(image:TImage;_oTable:TTable);
var
 x, y  :Integer;
begin
 Try
  x:=0;
  y:=0;

  image.Picture.Bitmap.Canvas.Font.nAME:= 'Arial';
  image.Picture.Bitmap.Canvas.Font.Style:= [fsBold];
  image.Picture.Bitmap.Canvas.Font.Size := 14;
  image.Picture.Bitmap.Canvas.TextOut(16  , 152 , 'More Information');

  image.Picture.Bitmap.Canvas.Font.Size := 10;
  image.Picture.Bitmap.Canvas.Font.Style:= [];
  image.Picture.Bitmap.Canvas.TextOut(32  , 184 , 'Blood Type');
  image.Picture.Bitmap.Canvas.Font.Style:= [fsBold, fsUnderLine];
  image.Picture.Bitmap.Canvas.TextOut(112  , 184 , _oTable.fieldbyname('BLOODTYP').asstring);

  image.Picture.Bitmap.Canvas.Font.nAME:= 'Arial';
  image.Picture.Bitmap.Canvas.Font.Style:= [fsBold];
  image.Picture.Bitmap.Canvas.Font.Size := 12;
  image.Picture.Bitmap.Canvas.TextOut(16  , 224 , 'Allergies');
  image.Picture.Bitmap.Canvas.Font.Style:= [];
  image.Picture.Bitmap.Canvas.Font.Size := 10;
  image.Picture.Bitmap.Canvas.TextOut(112  , 200 , _oTable.fieldbyname('ALLERGIE').asstring);


  image.Picture.Bitmap.Canvas.Font.Style:= [fsBold,fsItalic];
  image.Picture.Bitmap.Canvas.Font.nAME:= 'MS Sans Serif';
  image.Picture.Bitmap.Canvas.Font.Size := 8;
  image.Picture.Bitmap.Canvas.TextOut(16  , 712 , 'Printed on '+formatdatetime('MMMM DD, YYYY  HH:MM:SS am/pm',NOW));
end;
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Question by:ryan_sabarre
  • 2
3 Comments
 

Author Comment

by:ryan_sabarre
ID: 16927081
Thanks in advance
0
 
LVL 17

Accepted Solution

by:
TheRealLoki earned 50 total points
ID: 16931527
Youcan use the "DrawText" method with DT_WORDBREAK
If you don't wish to, or it's too complicated, then here's a simple demo I wrote which does just wordwrapping without using the DrawText method

procedure WordWrapTextOut(canvas: TCanvas; var x, y: integer; S: string; maxwidth, lineheight: integer);

implementation

{$R *.dfm}


procedure TForm1.FormCreate(Sender: TObject);
begin
  image1.picture.bitmap.Width := image1.width;
  image1.picture.Bitmap.Height := image1.height;
  image1.picture.Bitmap.Canvas.Brush.color := clBlack;
  image1.picture.Bitmap.Canvas.Fillrect(RECT(0,0,image1.picture.bitmap.Width,image1.picture.bitmap.Height));
  image1.picture.Bitmap.Canvas.Font.Color := clWhite;
end;

{ This will start drawing text from x, y. If it goes past maxwidth, it will drop to next line.
At the end of this routine, x and y will be at the position just past the end of the text}
procedure WordWrapTextOut(canvas: TCanvas; var x, y: integer; S: string; maxwidth, lineheight: integer);
  const
    delims = ' ,.:;?!';
  var
    textw, texth, tempw: integer;
    firststring, secondstring: string;
    i: integer;
  begin
    firststring := s;
    while firststring <> '' do
    begin
      secondstring := '';
      textw := canvas.TextWidth(firststring);
      while (
              (firststring <> '') and  (textw > maxwidth)
            ) do
      begin
        secondstring := firststring[length(firststring)] + secondstring;
        delete(firststring, length(firststring), 1);
        tempw := canvas.TextWidth(firststring);
        if ( (tempw <= maxwidth) and  (pos(firststring[length(firststring)], delims) > 0) ) then
          textw := tempw;
      end;
// searching for delimiter failed. fall back to wrap at last char
      if firststring = '' then
      begin
        firststring := secondstring;
        secondstring := '';
        textw := canvas.TextWidth(firststring);
        while ( (textw > maxwidth) and (length(firststring) > 0) ) do
        begin
          secondstring := firststring[length(firststring)] + secondstring;
          delete(firststring, length(firststring), 1);
          textw := canvas.TextWidth(firststring);
        end;
      end;
// actually draw some text
      canvas.TextOut(x, y, firststring);
      firststring := secondstring;
      if firststring <> '' then
      begin
        y := y + lineheight;
      end;
    end;
// get the position right in case the user wishes to add some more text to this line
    x := x + textw;
  end;

procedure TForm1.Button1Click(Sender: TObject);
var
  x, y: integer;
  lineheight: integer;
begin
  x := 0;
  y := 0;
  lineheight := image1.picture.Bitmap.Canvas.TextHeight('W') + 1; // 1 space between lines
  WordWrapTextOut(image1.picture.Bitmap.Canvas, x, y, 'short line', image1.picture.bitmap.width, lineheight);
  WordWrapTextOut(image1.picture.Bitmap.Canvas, x, y, ' plus this', image1.picture.bitmap.width, lineheight);
// next line
  x := 0;
  y := y + lineheight;
  WordWrapTextOut(image1.picture.Bitmap.Canvas, x, y, 'this is a bigger line which should word wrap', image1.picture.bitmap.width, lineheight);
// next line
  x := 0;
  y := y + lineheight;
  WordWrapTextOut(image1.picture.Bitmap.Canvas, x, y, memo1.lines.text, 200, lineheight);
end;

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Author Comment

by:ryan_sabarre
ID: 16977618
Thanks a lot.
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