This documentation is automatically generated by online-judge-tools/verification-helper
#include "geometry/cross_point_ll.hpp"
#include "base.hpp"
#include "line.hpp"
namespace geometry {
Point cross_point_ll(const Line &l, const Line &m) {
Real A = cross(l.b - l.a, m.b - m.a);
Real B = cross(l.b - l.a, l.b - m.a);
if (equals(abs(A), 0) && equals(abs(B), 0)) return m.a;
return m.a + (m.b - m.a) * B / A;
}
} // namespace geometry
#line 2 "geometry/base.hpp"
namespace geometry {
using Real = double;
const Real EPS = 1e-8;
const Real PI = acos(static_cast<Real>(-1));
enum { OUT, ON, IN };
inline int sign(const Real &r) { return r <= -EPS ? -1 : r >= EPS ? 1 : 0; }
inline bool equals(const Real &a, const Real &b) { return sign(a - b) == 0; }
} // namespace geometry
#line 3 "geometry/point.hpp"
namespace geometry {
using Point = complex<Real>;
istream &operator>>(istream &is, Point &p) {
Real a, b;
is >> a >> b;
p = Point(a, b);
return is;
}
ostream &operator<<(ostream &os, const Point &p) {
return os << real(p) << " " << imag(p);
}
Point operator*(const Point &p, const Real &d) {
return Point(real(p) * d, imag(p) * d);
}
// rotate point p counterclockwise by theta rad
Point rotate(Real theta, const Point &p) {
return Point(cos(theta) * real(p) - sin(theta) * imag(p),
sin(theta) * real(p) + cos(theta) * imag(p));
}
Real cross(const Point &a, const Point &b) {
return real(a) * imag(b) - imag(a) * real(b);
}
Real dot(const Point &a, const Point &b) {
return real(a) * real(b) + imag(a) * imag(b);
}
bool compare_x(const Point &a, const Point &b) {
return equals(real(a), real(b)) ? imag(a) < imag(b) : real(a) < real(b);
}
bool compare_y(const Point &a, const Point &b) {
return equals(imag(a), imag(b)) ? real(a) < real(b) : imag(a) < imag(b);
}
using Points = vector<Point>;
} // namespace geometry
#line 3 "geometry/line.hpp"
namespace geometry {
struct Line {
Point a, b;
Line() = default;
Line(const Point &a, const Point &b) : a(a), b(b) {}
Line(const Real &A, const Real &B, const Real &C) { // Ax+By=C
if (equals(A, 0)) {
assert(!equals(B, 0));
a = Point(0, C / B);
b = Point(1, C / B);
} else if (equals(B, 0)) {
a = Point(C / A, 0);
b = Point(C / A, 1);
} else {
a = Point(0, C / B);
b = Point(C / A, 0);
}
}
friend ostream &operator<<(ostream &os, Line &l) {
return os << l.a << " to " << l.b;
}
friend istream &operator>>(istream &is, Line &l) { return is >> l.a >> l.b; }
};
using Lines = vector<Line>;
} // namespace geometry
#line 3 "geometry/cross_point_ll.hpp"
namespace geometry {
Point cross_point_ll(const Line &l, const Line &m) {
Real A = cross(l.b - l.a, m.b - m.a);
Real B = cross(l.b - l.a, l.b - m.a);
if (equals(abs(A), 0) && equals(abs(B), 0)) return m.a;
return m.a + (m.b - m.a) * B / A;
}
} // namespace geometry