#include <stdio.h>
#include "prog04header.h"

int main() {
  Triangle tri1, tri2;
  double area1, area2;
  XY centroid1, centroid2;

  /* １つ目の三角形の３頂点の座標を入力する */
  printf("Input 1st triangle:\n");
  InputTriangle( &tri1 );

  /* １つ目の三角形の面積を求める */
  area1 = CalcArea( tri1 );

  while (area1 == 0.0) {
    printf("These points do not form a triangle!\n");
    printf("Again, input 1st triangle:\n");
    InputTriangle( &tri1 );
    area1 = CalcArea( tri1 );
  }
  
  /* ２つ目の三角形の３頂点の座標を入力する */  
  printf("Input 2nd triangle:\n");
  InputTriangle( &tri2 );

  /* ２つ目の三角形の面積を求める */
  area2 = CalcArea( tri2 );

  while (area2 == 0.0) {
    printf("These points do not form a triangle!\n");
    printf("Again, input 2nd triangle:\n");
    InputTriangle( &tri2 );
    area2 = CalcArea( tri2 );
  }


  /* CalcAreaで求めた三角形の面積を２つ表示 */
  printf("\nArea of 1st one: %.3f   Area of 2nd one: %.3f\n", area1, area2);

  /* 面積の大きい方を判定して、表示 */
  if (area1 == area2)
    printf("The two triangles have the same area!\n\n");
  else if (area1 > area2)
    printf("The 1st one is larger than the 2nd one!\n\n");
  else
    printf("The 2nd one is larger than the 1st one!\n\n");

  /* １つ目の三角形の重心を求める */
  centroid1 = CalcCentroid( tri1 );
  /* ２つ目の三角形の重心を求める */
  centroid2 = CalcCentroid( tri2 );

  /* GetCentroidで求めた三角形の重心を２つ表示 */  
  printf("Centroid of 1st one:  (%.3f, %.3f)\n", centroid1.x, centroid1.y);
  printf("Centroid of 2nd one:  (%.3f, %.3f)\n", centroid2.x, centroid2.y);

  return 0;
}