CheckerBoard.cpp

This code demonstrates how to create an image view in memory and write data into it to create a checkerboard pattern.

This code demonstrates how to create an image view in memory and write data into it to create a checkerboard pattern.The code creates a 2D image of given size and fills it pixel by pixel.

#include <chrono>
#include <iostream>
#include <vector>
 
#include <iolink/view/ImageViewFactory.h>
 
using namespace iolink;
 
std::shared_ptr<ImageView>
checkerBoard(const size_t sideLength)
{
  // a checker board is always square
  const VectorXu64 shape{sideLength, sideLength};
  // a checkerboard is black and white, so we use UINT8 pixel type
  const DataType dt = DataTypeId::UINT8;
 
  // create an image view in memory
  auto image = ImageViewFactory::allocate(shape, dt);
 
  // a checkerboard contains 10 tiles in both direction
  const size_t tileCount = 10;
 
  uint8_t blackValue = 0;   // black pixel value to set
  uint8_t whiteValue = 255; // white pixel value to set
 
  size_t tileSizeInPixel = static_cast<size_t>(shape[0] / tileCount);
 
  // draw tiles in the image pixel by pixel
  for (size_t i = 0; i < shape[0]; ++i)
  {
    for (size_t j = 0; j < shape[1]; ++j)
    {
      // compute the tile index
      size_t tileIndexX = i / tileSizeInPixel;
      size_t tileIndexY = j / tileSizeInPixel;
 
      // set the pixel value to 0 or 255 depending on the tile index parity
      if ((tileIndexX + tileIndexY) % 2 == 0)
        image->write({i, j}, &blackValue);
      else
        image->write({i, j}, &whiteValue);
    }
  }
 
  return image;
}
 
int
main(int argc, char** argv)
{
  std::chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
 
  auto image = checkerBoard(1000);
 
  std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
  std::cout << "Checkerboard generated in "
            << std::chrono::duration_cast<std::chrono::microseconds>(end - begin).count() << " microseconds"
            << std::endl;
 
  std::cout << "Generated ImageView: " << image->toString() << std::endl;
 
  return EXIT_SUCCESS;
}