ExampleDrawLines.cpp

Simple example that draws

• a rotating line (like a clock hand)
• a moving line that moves sqrt(2) pixels during the whole iteration (x and y are both increased by one)
• a static line with a very low slope
• a clipped line (with start and end points outside of ROI)
• another clipped line (with only the end point outside of ROI)
• one line crossing all others (using contrast color functionality)

A set of images is produced (according to variable "steps") that you can view in biasviewwx as an animation.

Author

MIP

/*
This file is part of the BIAS library (Basic ImageAlgorithmS).

Copyright (C) 2003-2009    (see file CONTACT for details)
  Multimediale Systeme der Informationsverarbeitung
  Institut fuer Informatik
  Christian-Albrechts-Universitaet Kiel


BIAS 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.

BIAS 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 BIAS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/


/**
 * @example ExampleDrawLines.cpp
   @brief Simple example that draws
   - a rotating line (like a clock hand)
   - a moving line that moves sqrt(2) pixels during the whole iteration
   (x and y are both increased by one)
   - a static line with a very low slope
   - a clipped line (with start and end points outside of ROI)
   - another clipped line (with only the end point outside of ROI)
   - one line crossing all others (using contrast color functionality)

   A set of images is produced (according to variable "steps") that you can view
   in biasviewwx as an animation.
   @ingroup g_examples
   @author MIP
*/

#include <iostream>
#include <sstream>

#include <Base/Image/Image.hh>
#include <Base/Image/ImageIO.hh>
#include <Base/ImageUtils/ImageDraw.hh>

#include <Base/Geometry/HomgPoint2D.hh>
#include <Base/Geometry/HomgPoint3D.hh>
#include <Geometry/RMatrix.hh>

using namespace BIAS;
using namespace std;



int main(int argc, char** argv) {

  // leading zeroes in filenames will only be set correctly if steps is below 999
  unsigned int steps = 90;
  // unused variable: int antialiased = 1; // 0 = no AA, 1 = AA

  Image<unsigned char> image(400, 400, 3); // min reasonable size: 200x200

  unsigned char bgCol[] = {127, 0, 127};

  std::vector<unsigned char> red, green, blue, white, gray, none;
  red.push_back(255);
  red.push_back(0);
  red.push_back(0);
  green.push_back(0);
  green.push_back(255);
  green.push_back(0);
  blue.push_back(0);
  blue.push_back(0);
  blue.push_back(255);
  white.push_back(255);
  white.push_back(255);
  white.push_back(255);
  gray.push_back(127);
  gray.push_back(127);
  gray.push_back(127);

  HomgPoint2D clockCenter(image.GetWidth() / 2, image.GetHeight() / 2);
  HomgPoint2D clockOuter(image.GetWidth() / 2, image.GetHeight() / 4);
  HomgPoint2D clockOuterRunner(clockOuter);
  HomgPoint2D moveStart(10, image.GetHeight() / 4);
  HomgPoint2D moveEnd(110, image.GetHeight() / 4);
  HomgPoint2D moveStartRunner(moveStart);
  HomgPoint2D moveEndRunner(moveEnd);
  HomgPoint2D staticStart(10, image.GetHeight() / 8);
  HomgPoint2D staticEnd(image.GetWidth() - 10, image.GetHeight() / 8 + 2);
  HomgPoint2D clippedStart(image.GetWidth() / 2, image.GetHeight() + 20);
  HomgPoint2D clippedEnd(image.GetWidth() + 20, image.GetHeight() / 2);
  HomgPoint2D clippedStart2(image.GetWidth() / 2, image.GetHeight() * 2 / 3);
  HomgPoint2D clippedEnd2(image.GetWidth() + 20, image.GetHeight() * 2 / 3);
  HomgPoint2D crossedStart(1, 1);
  HomgPoint2D crossedEnd(image.GetWidth(), image.GetHeight());

  float angle = 2.0f * float(M_PI) / float(steps); // angle per iteration

  ostringstream filename;

  for (unsigned int i = 0; i < steps; i++) {
    cout << endl << endl << "step: " << (i + 1) << "/" << steps << endl;

    // prepare image and filename
    image.GetROI()->UnsetROI();
    image.FillImageWithConstValue(bgCol);
    image.SetROICorners(0, 0, image.GetWidth() - 50, image.GetHeight() - 50);

    filename.str("");
    filename << "clock_";
    if (i < 100) {
      filename << 0;
    }
    if (i < 10) {
      filename << 0;
    }
    filename << i << ".mip";

    /////
    // WHITE CIRCLE
    /////
    unsigned char col[] = {255, 255, 255};
    ImageDraw<unsigned char>::CircleCenterFilled(image,
                                                 image.GetWidth() / 2,
                                                 image.GetHeight() / 2,
                                                 100,
                                                 col);

    /////
    // ROTATING LINE (clock)
    /////

    // calc new postion of clock point:
    // - reset
    clockOuterRunner[0] = clockOuter[0];
    clockOuterRunner[1] = clockOuter[1];

    // - translate clockOuterRunner so that clockCenter is in coord center
    clockOuterRunner[0] -= clockCenter[0];
    clockOuterRunner[1] -= clockCenter[1];

    // - rotation
    RMatrix R;
    Vector3<ROTATION_MATRIX_TYPE> p3D1(clockOuterRunner[0], clockOuterRunner[1], 0);
    Vector3<ROTATION_MATRIX_TYPE> p3D2;
    R.SetXYZ(0.0, 0.0, i * angle);
    R.Mult(p3D1, p3D2);
    clockOuterRunner[0] = p3D2[0];
    clockOuterRunner[1] = p3D2[1];

    // - undo translation
    clockOuterRunner[0] += clockCenter[0];
    clockOuterRunner[1] += clockCenter[1];

    // draw line
   //  ImageDraw<unsigned char>::Line(image,
//                                    clockCenter, clockOuterRunner,
//                                    red,
//                                    antialiased);

    /////
    // MOVING LINE
    /////

    moveStartRunner[0] = moveStart[0];
    moveStartRunner[0] += (HOMGPOINT2D_TYPE)i / (HOMGPOINT2D_TYPE)steps;
    moveStartRunner[1] = moveStart[1] + i / steps;
    moveStartRunner[1] += (HOMGPOINT2D_TYPE)i / (HOMGPOINT2D_TYPE)steps;

    moveEndRunner[0] = moveEnd[0] + i / steps;
    moveEndRunner[0] += (HOMGPOINT2D_TYPE)i / (HOMGPOINT2D_TYPE)steps;
    moveEndRunner[1] = moveEnd[1] + i / steps;
    moveEndRunner[1] += (HOMGPOINT2D_TYPE)i / (HOMGPOINT2D_TYPE)steps;

   //  ImageDraw<unsigned char>::Line(image,
//                                    moveStartRunner, moveEndRunner,
//                                    blue,
//                                    antialiased);

    /////
    // STATIC LINE
    /////

    // ImageDraw<unsigned char>::Line(image,
//                                    staticStart, staticEnd,
//                                    green,
//                                    antialiased);

    /////
    // CLIPPED LINE
    /////

 //    ImageDraw<unsigned char>::Line(image,
//                                    clippedStart, clippedEnd,
//                                    white,
//                                    antialiased);

    /////
    // CLIPPED LINE 2
    /////

  //   ImageDraw<unsigned char>::Line(image,
//                                    clippedStart2, clippedEnd2,
//                                    gray,
//                                    antialiased);

    /////
    // CROSSED LINES
    /////

  //   ImageDraw<unsigned char>::Line(image,
//                                    crossedStart, crossedEnd,
//                                    none,
//                                    antialiased);

    // save image
    ImageIO::Save(filename.str(), image);
  }

  return 0;
}