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...scale bitmap by percent?
Autor: Sergio Canonigo Jr.
[ Print tip ]  

Tip Rating (32):  
     


{ .... }

  
private
    function 
ScalePercentBmp(bitmp: TBitmap; iPercent: Integer): Boolean;
    
{ .... }

function TForm1.ScalePercentBmp(bitmp: TBitmap;
  iPercent: Integer): Boolean;
var
  
TmpBmp: TBitmap;
  ARect: TRect;
  h, w: Real;
  hi, wi: Integer;
begin
  
Result := False;
  try
    
TmpBmp := TBitmap.Create;
    try
      
h := bitmp.Height * (iPercent / 100);
      w := bitmp.Width * (iPercent / 100);
      hi := StrToInt(FormatFloat('#', h)) + bitmp.Height;
      wi := StrToInt(FormatFloat('#', w)) + bitmp.Width;
      TmpBmp.Width := wi;
      TmpBmp.Height := hi;
      ARect := Rect(0, 0, wi, hi);
      TmpBmp.Canvas.StretchDraw(ARect, Bitmp);
      bitmp.Assign(TmpBmp);
    finally
      
TmpBmp.Free;
    end;
    Result := True;
  except
    
Result := False;
  end;
end;


// Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
  
ScalePercentBmp(Image1.Picture.Bitmap, 33);
end;

 

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