how do I customize barcode width?

Comments

• Paul Michael

  June 2016 edited 4:29PM

  enriquellacerdaros wrote: »

  I've seen some examples in forum, but I can't resolve the issue. It only change with the WideBarRatio property, but it isn't valid.
  Always I want the width to be equal, 8cm; but... depending on text, barcode have a different width.
  
  I'm using Code128 and Ean128.
  
  thx a lot

  
  Depending on how much data is placed inside the barcode, it grows. I did something like this. It is not perfect but works in the situations where I needed fixed width barcodes. Important remark, do not make the required width too small or the barcode will not be scannable:
  

  TLocusBarcodeView = class(TfrxBarCodeView)
    private
      FRequiredWidth: extended;
    private
      procedure CalculateZoom;
    protected
      procedure setRequiredWidth(const aValue: extended);
    public
      constructor Create(AOwner: TComponent); override;
      procedure GetData; override;
    published
      property RequiredWidth: extended read FRequiredWidth write SetRequiredWidth;
    end;
  

  constructor TLocusBarcodeView.Create(AOwner: TComponent);
  begin
    inherited;
  
    FRequiredWidth := 0.0;
  end;
  
  
  procedure TLocusBarcodeView.CalculateZoom;
  
    procedure Calculate;
    var
      r : TfrxRect;
      RealWidth: extended;
    begin
      r := GetRealBounds;
      RealWidth := (r.Right - r.Left);
      if (RealWidth > 0.01) and (CompareValue(RealWidth, RequiredWidth, 0.01)<>EqualsValue) then
      begin
        Zoom := RequiredWidth/RealWidth;
      end;
    end;
  
  begin
    Calculate;
  end;
  
  
  procedure TLocusBarcodeView.GetData;
  
  function AddLeadingZeroes(const aNumber: string; const Length : integer) : string;
  begin
    try
      Result := Format('%.*d', [Length, strtoint(aNumber)]);
    except
      Result := aNumber;
    end;
  end;
  
  begin
    inherited;
  
    case BarType of
      bcCodeEAN8:
      begin
        Text := AddLeadingZeroes(Text,8);
      end;
    end;
  
    if (RequiredWidth > 0.0) then
    begin
      Zoom := 1.0;
      CalculateZoom;
    end;
  end;
  
  
  procedure TLocusBarcodeView.setRequiredWidth(const aValue: extended);
  begin
    FRequiredWidth := aValue;
  end;