A5/Rhombus.cpp

#include "Rhombus.h"

#include "GeometryUtils.h"
#include "IsoscelesTriangle.h"

bool Rhombus::validate() {
  double sideOne = calculate_distance(mVertices[0], mVertices[1]);
  double sideTwo = calculate_distance(mVertices[1], mVertices[2]);
  double sideThree = calculate_distance(mVertices[2], mVertices[3]);
  double sideFour = calculate_distance(mVertices[3], mVertices[0]);

  IsoscelesTriangle firstTriangle;
  firstTriangle.setCoordinate(0, mVertices[0]);
  firstTriangle.setCoordinate(1, mVertices[1]);
  firstTriangle.setCoordinate(2, mVertices[2]);

  IsoscelesTriangle secondTriangle;
  secondTriangle.setCoordinate(0, mVertices[0]);
  secondTriangle.setCoordinate(1, mVertices[2]);
  secondTriangle.setCoordinate(2, mVertices[3]);

  // A valid rhombus must (a) Have vertices (0, 1, 2) make a valid isosceles
  // triangle, (b) Have vertices (0, 2, 3) make a valid isosceles triangle,
  // and (c) Have all sides of equal length
  return firstTriangle.validate() && secondTriangle.validate() &&
         (double_eq(sideOne, sideTwo) && double_eq(sideTwo, sideThree) &&
          double_eq(sideThree, sideFour));
}