test_bounding_box.cpp File Reference

#include "pcod_common/bounding_box.hpp"
#include <cassert>
#include <cmath>

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Functions
int	main ()

Function Documentation

main()

int main

(

)

Run bounding-box geometry regression checks.

Definition at line 31 of file test_bounding_box.cpp.

           {
  const pcod_common::BoundingBox base = MakeBox(0.0f, 0.0f, 4.0f, 2.0f, 0.0f);
 
  {
    const pcod_common::BoundingBox same = MakeBox(0.0f, 0.0f, 4.0f, 2.0f, 0.0f);
    const float area_a = base.intersection_area(same);
    const float area_b = same.intersection_area(base);
    assert(std::abs(area_a - area_b) < 1e-6f);
    assert(std::abs(area_a - (base.length * base.width)) < 1e-6f);
    assert(base.overlaps(same, 0.99f));
  }
 
  {
    const pcod_common::BoundingBox far = MakeBox(100.0f, 100.0f, 4.0f, 2.0f, 0.0f);
    assert(base.intersection_area(far) == 0.0f);
    assert(!base.overlaps(far, 0.0f));
  }
 
  {
    const pcod_common::BoundingBox shifted = MakeBox(1.0f, 0.0f, 4.0f, 2.0f, 0.0f);
    const float area_forward = base.intersection_area(shifted);
    const float area_reverse = shifted.intersection_area(base);
    assert(area_forward > 0.0f);
    assert(std::abs(area_forward - area_reverse) < 1e-6f);
  }
 
  {
    const pcod_common::BoundingBox rotated = MakeBox(0.0f, 0.0f, 4.0f, 2.0f, 1.57079632679f);
    const float area = base.intersection_area(rotated);
    assert(area > 0.0f);
    assert(area < base.length * base.width);
  }
 
  return 0;
}

References pcod_common::BoundingBox::intersection_area(), pcod_common::BoundingBox::length, pcod_common::BoundingBox::overlaps(), and pcod_common::BoundingBox::width.