// *****************************************************************
// Delphi-OpenCV Demo
// Copyright (C) 2013 Project Delphi-OpenCV
// ****************************************************************
// Contributor:
// Laentir Valetov
// email:laex@bk.ru
// ****************************************************************
// You may retrieve the latest version of this file at the GitHub,
// located at git://github.com/Laex/Delphi-OpenCV.git
// ****************************************************************
// The contents of this file are used with permission, subject to
// the Mozilla Public License Version 1.1 (the "License"); you may
// not use this file except in compliance with the License. You may
// obtain a copy of the License at
// http://www.mozilla.org/MPL/MPL-1_1Final.html
//
// Software distributed under the License is distributed on an
// "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
// implied. See the License for the specific language governing
// rights and limitations under the License.
// *******************************************************************

program cv_FindContours3;

{$APPTYPE CONSOLE}
{$R *.res}

uses
  System.SysUtils,
  highgui_c,
  core_c,
  Core.types_c,
  imgproc_c,
  imgproc.types_c;

const
  filename = 'Resource\Contours.jpg';

var
  image                : pIplImage     = nil;
  dst                  : pIplImage     = nil;
  img_gray             : pIplImage     = Nil;
  contours             : pCvSeq        = nil;
  lp_contour           : pCvSeq        = nil;
  child_contours       : pCvSeq        = nil;
  storage              : pCvMemStorage = nil;
  color_ext, color_hole: TCvScalar;
  l_pt0, l_pt1         : TCvPoint;
  l_reader             : TCvSeqReader;
  l_iterator           : TCvTreeNodeIterator;
  i                    : Integer;

begin
  try
    // получаем картинку
    image := cvLoadImage(
      filename,
      CV_LOAD_IMAGE_UNCHANGED);
    if Assigned(image) then
    begin
      cvNamedWindow(
        'Source image',
        CV_WINDOW_AUTOSIZE);
      cvNamedWindow(
        'Contour image',
        CV_WINDOW_AUTOSIZE);

      cvShowImage(
        'Source image',
        image);
      // cоздаем изображение в градациях cерого
      img_gray := cvCreateImage(
        cvSize(image^.width, image^.height),
        IPL_DEPTH_8U,
        1);
      dst := cvCreateImage(
        cvSize(image^.width, image^.height),
        IPL_DEPTH_8U,
        1);
      cvCvtColor(
        image,
        img_gray,
        CV_BGR2GRAY);
      storage := cvCreateMemStorage(0);
      cvThreshold(
        img_gray,
        dst,
        128,
        255,
        CV_THRESH_BINARY_INV);
      // cvAdaptiveThreshold(img_gray, img_gray, 255, CV_ADAPTIVE_THRESH_GAUSSIAN_C, CV_THRESH_BINARY, 21, 7);
      contours := nil; // AllocMem(SizeOf(TCvSeq));
      cvFindContours(
        dst,
        storage,
        @contours,
        SizeOf(TCvContour),
        CV_RETR_EXTERNAL, //Только внешние контуры
        //CV_RETR_CCOMP, //Все контуры с разделением внешние и дырки
        CV_CHAIN_APPROX_SIMPLE,
        cvPoint(0, 0));

      color_ext := CV_RGB(
        100,
        200,
        0);
      color_hole := CV_RGB(
        200,
        100,
        0);

      // ---------------------------- Внешние контуры ----------------------------
//      lp_contour := contours;
//      cvInitTreeNodeIterator(
//        l_iterator,
//        contours,
//        1);
//      lp_contour := cvNextTreeNode(@l_iterator);
//      while Assigned(lp_contour) do
//      begin
//        cvStartReadSeq(
//          lp_contour,
//          @l_reader,
//          0);
//        // Первая точка
//        CV_READ_SEQ_ELEM(
//          @l_pt0,
//          l_reader,
//          SizeOf(l_pt0));
//        // l_pts1.push_back(l_pt0);
//        for i := 0 to lp_contour^.total - 1 do
//        begin
//          // Последующие точки
//          CV_READ_SEQ_ELEM(
//            @l_pt1,
//            l_reader,
//            SizeOf(l_pt0));
//          cvLine(
//            image,
//            l_pt0,
//            l_pt1,
//            CV_RGB(0, 255, 0),
//            2);
//          l_pt0 := l_pt1;
//          // l_pts1.push_back(l_pt0);
//        end;
//        lp_contour := cvNextTreeNode(@l_iterator);
//      end;

      //  ------------------------ Все контуры ----------------------------
       while Assigned(contours) do
       begin
       if CV_IS_SEQ_CLOSED(contours) then
       cvDrawContours(
       image,
       contours,
       color_ext,
       color_hole,
       -1,
       2, // CV_FILLED, // replace CV_FILLED with 1 to see the outlines
       CV_AA,
       cvPoint(0, 0));
       contours := contours^.h_next;
       end;

      cvShowImage(
        'Contour image',
        image);

      cvWaitKey(0);
      cvDestroyAllWindows;
      cvReleaseImage(image);
      cvReleaseImage(img_gray);
      cvReleaseImage(dst);
    end;
  except
    on E: Exception do
      WriteLn(
        E.ClassName,
        ': ',
        E.Message);
  end;

end.