line2d.cpp

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// -*- mode: c++ -*-
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#include "jsk_footstep_planner/line2d.h"

namespace jsk_footstep_planner
{
  Line2D::Line2D(const Eigen::Vector3f& p, const Eigen::Vector3f& q):
    u_(p[0], p[1]), v_(q[0], q[1])
  {
  }

  bool Line2D::isCrossing(Line2D& other)
  {
    const float d = ((v_[0] - u_[0]) * (other.v_[1] - other.u_[1])
                     - (v_[1] - u_[1]) * (other.v_[0] - other.u_[0]));
    if (d == 0) {               // parallel
      return false;
    }
    const float u = ((other.u_[0] - u_[0])*(other.v_[1] - other.u_[1])
                     - (other.u_[1] - u_[1])*(other.v_[0] - other.u_[0]))/d;
    const float v = ((other.u_[0] - u_[0])*(v_[1] - u_[1])
                     - (other.u_[1] - u_[1])*(v_[0] - u_[0]))/d;
    if (u < 0.0 || u > 1.0) {
      return false;
    }
    if (v < 0.0 || v > 1.0) {
      return false;
    }
    return true;
  }
}