unit filterContour;
(* ***** BEGIN LICENSE BLOCK *****
 * Copyright (C) 2004 Durand Emmanuel
 * Copyright (C) 2004 Burgel Eric
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Contact :
 *   filters@edurand.com
 *   filters@burgel.com
 *
 * ***** END LICENSE BLOCK ***** *)

{
 edurand (filters@edurand.com)
}

{
 use 'OpenCv' Suzuki algorithms implementation
}

interface
uses
  filter, fparameters, image;

type
  TFilterContour = class(TFilter)
  public
    constructor Create; override;
    procedure Run(); override;
  private
    parameterImageIn, parameterImageOut : TParameterImage;
    parameterThreshold : TParameterInteger;
    parameterFill : TParameterBoolean;
    parameterCriticalPoints : TParameterBoolean;
    parameterApproximationAccuracy : TParameterInteger;
  end;

implementation
uses
  imageIO, wrapper_opencv, SysUtils;

constructor TFilterContour.Create;
begin
  inherited;
  parameterImageIn:=addParameterImage('inImage', 'input image');
  parameterImageOut:=addParameterImage('outImage', 'result image');
  parameterThreshold:=addParameterInteger('threshold','threshold1',0,255,100);
  parameterFill:=addParameterBoolean('fill','fill contours',True);
  parameterCriticalPoints:=addParameterBoolean('criticalPoints','show critical points of the contours',True);
  parameterApproximationAccuracy:=addParameterInteger('approximationAccuracy','approximationAccuracy',0,10,1);
end;

procedure TFilterContour.Run();
var
  fill, criticalPoints : Integer;
begin
  if (parameterImageIn.Image<>nil) and (parameterImageOut.Image<>nil) then begin
    fill:=1;
    if parameterFill.Value=False then fill:=0;
    criticalPoints:=1;
    if parameterCriticalPoints.Value=False then criticalPoints:=0;
    wrapper_opencv.filterCvContours(
      parameterImageIn.Image,parameterImageOut.Image,
      parameterThreshold.Value,fill,
      criticalPoints,parameterApproximationAccuracy.Value
    );
  end;
end;

end.