A5/GeometryUtils.cpp

#include "GeometryUtils.h"

#include <cmath>

const double EPSILON = 1e-7;

bool double_eq(double first, double second) {
  if (std::abs(first - second) <= EPSILON) {
    return true;
  } else {
    return false;
  }
}

double calculate_distance(Coordinate& firstPoint, Coordinate& secondPoint) {
  return std::sqrt(std::pow(secondPoint.x - firstPoint.x, 2) +
                   std::pow(secondPoint.y - firstPoint.y, 2));
}

bool lengths_make_triangle(double sideOne, double sideTwo, double sideThree) {
  // Not a triangle if one of the side lengths is 0
  if (sideOne <= 0 || sideTwo <= 0 || sideThree <= 0) {
    return false;
  }

  // Not a triangle if the sum of any two side lengths >= the third length
  if (sideOne + sideTwo <= sideThree || sideTwo + sideThree <= sideOne ||
      sideThree + sideOne <= sideTwo) {
    return false;
  }

  return true;
}