drawille.hpp

#ifndef DRAWILLE_HPP
#define DRAWILLE_HPP

#include <vector>
#include <ostream>

namespace Drawille {
  using std::vector;
  using std::wostream;

  constexpr size_t pixmap[4][2] = {
    {0x01, 0x08},
    {0x02, 0x10},
    {0x04, 0x20},
    {0x40, 0x80}
  };

  constexpr wchar_t braille = 0x2800;

  class Canvas {
  public:
    Canvas(size_t width, size_t height) {
      this->canvas.resize(height);
      for(auto& v: this->canvas)
        v.resize(width);
    }

    void set(size_t x, size_t y) {
      if(x > (this->canvas[0].size() * 2) or x < 1) x = 0;
      if(y > (this->canvas.size() * 4) or y < 1)    y = 0;
      this->canvas[y / 4][x / 2] |= pixmap[y % 4][x % 2];
    }

    void unset(size_t x, size_t y) {
      if(x > (this->canvas[0].size() * 2) or x < 1) x = 0;
      if(y > (this->canvas.size() * 4) or y < 1)    y = 0;
      this->canvas[y / 4][x / 2] &= ~pixmap[y % 4][x % 2];
    }

    void draw(wostream& strm) {
      for(auto& v: this->canvas) {
        for(auto& c: v) {
          if(c == 0) strm << " ";
          else strm << std::wstring{braille+c};
        }
        strm << std::endl;
      }
    }

  protected:
    vector<vector<wchar_t>> canvas;
  };
}

#endif