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66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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#include "stdafx.h"
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#include "world/GaugeLine.h"
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namespace track_rails {
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gauge_line make_gauge_line( TSegment const &Segment, double const Offset, double const From ) {
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gauge_line line;
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line.segment = &Segment;
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line.offset = Offset;
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line.from = From;
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auto const length { Segment.GetLength() };
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auto const add = [&]( double const Distance ) {
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glm::dvec3 point, tangent;
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line.at( Distance, point, tangent );
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line.points.push_back( point );
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line.distances.push_back( Distance ); };
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auto const count { std::max( { 1, Segment.RaSegCount(), static_cast<int>( std::ceil( ( length - From ) / 5.0 ) ) } ) };
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for( int i = 0; i <= count; ++i ) {
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add( From + ( length - From ) * i / count );
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}
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line.low = line.high = plan( line.points.front() );
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for( auto const &point : line.points ) {
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line.low = glm::min( line.low, plan( point ) );
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line.high = glm::max( line.high, plan( point ) );
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}
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return line;
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}
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double lateral( gauge_line const &Line, int const Side, glm::dvec3 const &Point, double &Distance ) {
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glm::dvec3 point, tangent;
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for( int step = 0; step < 8; ++step ) {
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Line.at( Distance, point, tangent );
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Distance += glm::dot( plan( Point - point ), glm::normalize( plan( tangent ) ) );
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}
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Line.at( Distance, point, tangent );
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return -glm::dot( plan( Point - point ), plan( Line.normal( Distance, Side ) ) );
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}
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double nearest_distance( gauge_line const &Line, glm::dvec3 const &Point ) {
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auto result { Line.distances.front() };
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auto nearest { std::numeric_limits<double>::max() };
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for( std::size_t i = 0; i < Line.points.size(); ++i ) {
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auto const gap { glm::length( plan( Line.points[ i ] - Point ) ) };
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if( gap < nearest ) {
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nearest = gap;
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result = Line.distances[ i ];
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}
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}
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return result;
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}
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} // namespace track_rails
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