src/geometry/SegmentDistance.h

• View this file on GitHub
• Last update: 2025-07-19 20:33:24+09:00

Depends on

• src/geometry/Point.h

Required by

• src/geometry/InsidePolygon.h

Code

/**
 * Author: Ulf Lundstrom
 * Date: 2009-03-21
 * License: CC0
 * Source:
 * Description:\\
\begin{minipage}{75mm}
Returns the shortest distance between point p and the line segment from point s to e.
\end{minipage}
\begin{minipage}{15mm}
\vspace{-10mm}
\includegraphics[width=\textwidth]{src/geometry/SegmentDistance}
\end{minipage}
 * Usage: 
 * 	Point<double> a, b(2,2), p(1,1);
 * 	bool onSegment = segDist(a,b,p) < 1e-10;
 * Status: tested
 */
#pragma once

#include "src/geometry/Point.h"

typedef Point<double> P;
double segDist(P& s, P& e, P& p) {
	if (s==e) return (p-s).dist();
	auto d = (e-s).dist2(), t = min(d,max(.0,(p-s).dot(e-s)));
	return ((p-s)*d-(e-s)*t).dist()/d;
}

Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.14.0/x64/lib/python3.14/site-packages/onlinejudge_verify/documentation/build.py", line 71, in _render_source_code_stat
    bundled_code = language.bundle(stat.path, basedir=basedir, options={'include_paths': [basedir]}).decode()
                   ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.14.0/x64/lib/python3.14/site-packages/onlinejudge_verify/languages/cplusplus.py", line 187, in bundle
    bundler.update(path)
    ~~~~~~~~~~~~~~^^^^^^
  File "/opt/hostedtoolcache/Python/3.14.0/x64/lib/python3.14/site-packages/onlinejudge_verify/languages/cplusplus_bundle.py", line 312, in update
    raise BundleErrorAt(path, i + 1, "#pragma once found in a non-first line")
onlinejudge_verify.languages.cplusplus_bundle.BundleErrorAt: src/geometry/SegmentDistance.h: line 19: #pragma once found in a non-first line

Back to top page