CPSC 120 Create a simple PNG image

cpsc120_simple_image.cc

// Gist https://gist.github.com/mshafae/f3405bece8f6293036cbd94f2ae555c1
// Filename cpsc120_simple_image.cc
// CompileCommand clang++ -std=c++20 -I /usr/include/GraphicsMagick -lGraphicsMagick++ cpsc120_simple_image.cc
// Create a simple PNG image.

#include <Magick++.h>
#include <iostream>

int main(int argc, char* argv[]) {
  const int kImageWidthAndHeight{512};
  std::string output_file_name{"white_dot.png"};

  // This initializes the image library we are using.
  Magick::InitializeMagick(*argv);

  // Colors are defined with three channels: Red, Green, Blue.
  // The value for each channel is a floating point number between 0 and 1.
  // Black is all 0 values and white is all 1 values.
  Magick::ColorRGB white_color{1.0, 1.0, 1.0};
  Magick::ColorRGB blue_color{0.0, 0.0, 1.0};
  Magick::Geometry image_size(kImageWidthAndHeight, kImageWidthAndHeight);
  Magick::Image image(image_size, blue_color);

  // Set image's pixel located at x, y to white.
  // The x direction is left-right, thus column
  // the y direction is up-down, thus row
  image.pixelColor(kImageWidthAndHeight / 2, kImageWidthAndHeight / 2, white_color);

  image.write(output_file_name);

  return 0;
}