FTXUI/src/ftxui/screen/box.cpp

// Copyright 2020 Arthur Sonzogni. All rights reserved.
// Use of this source code is governed by the MIT license that can be found in
// the LICENSE file.
#include "ftxui/screen/box.hpp"

#include <algorithm>

namespace ftxui {
/// @return the biggest Box contained in both |a| and |b|.
// static
Box Box::Intersection(Box a, Box b) {
  return Box{
      std::max(a.x_min, b.x_min),
      std::min(a.x_max, b.x_max),
      std::max(a.y_min, b.y_min),
      std::min(a.y_max, b.y_max),
  };
}

/// @return the smallest Box containing both |a| and |b|.
// static
Box Box::Union(Box a, Box b) {
  return Box{
      std::min(a.x_min, b.x_min),
      std::max(a.x_max, b.x_max),
      std::min(a.y_min, b.y_min),
      std::max(a.y_max, b.y_max),
  };
}

/// Shift the box by (x,y).
/// @param x horizontal shift.
/// @param y vertical shift.
void Box::Shift(int x, int y) {
  x_min += x;
  x_max += x;
  y_min += y;
  y_max += y;
}

/// @return whether (x,y) is contained inside the box.
bool Box::Contain(int x, int y) const {
  return x_min <= x &&  //
         x_max >= x &&  //
         y_min <= y &&  //
         y_max >= y;
}

/// @return whether the box is empty.
bool Box::IsEmpty() const {
  return x_min > x_max || y_min > y_max;
}

/// @return whether |other| is the same as |this|
bool Box::operator==(const Box& other) const {
  return (x_min == other.x_min) && (x_max == other.x_max) &&
         (y_min == other.y_min) && (y_max == other.y_max);
}

/// @return whether |other| and |this| are different.
bool Box::operator!=(const Box& other) const {
  return !operator==(other);
}

}  // namespace ftxui