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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2017 Statoil ASA
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//
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// ResInsight is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// ResInsight is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <http://www.gnu.org/licenses/gpl.html>
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// for more details.
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//
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/////////////////////////////////////////////////////////////////////////////////
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#include "RigTesselatorTools.h"
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#include "cvfMath.h"
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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RigEllipsisTesselator::RigEllipsisTesselator( size_t numSlices )
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{
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computeCirclePoints( numSlices );
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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void RigEllipsisTesselator::tesselateEllipsis( float a, float b, std::vector<cvf::uint>* triangleIndices, std::vector<cvf::Vec3f>* nodeCoords )
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{
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// See http://mathworld.wolfram.com/Ellipse.html
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for ( auto v : m_circlePoints )
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{
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v.x() = v.x() * a;
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v.y() = v.y() * b;
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nodeCoords->push_back( v );
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}
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*triangleIndices = m_circleConnectivities;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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void RigEllipsisTesselator::computeCirclePoints( size_t numSlices )
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{
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// Based on GeometryUtils::generatePointsOnCircle
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double da = 2 * cvf::PI_D / numSlices;
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cvf::Vec3f point = cvf::Vec3f::ZERO;
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// Center of circle
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m_circlePoints.push_back( point );
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for ( size_t i = 0; i < numSlices; i++ )
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{
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// Precompute this one (A = i*da;)
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double sinA = cvf::Math::sin( i * da );
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double cosA = cvf::Math::cos( i * da );
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point.x() = static_cast<float>( -sinA );
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point.y() = static_cast<float>( cosA );
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m_circlePoints.push_back( point );
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}
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for ( cvf::uint i = 0; i < static_cast<cvf::uint>( numSlices ); i++ )
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{
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// Center
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m_circleConnectivities.push_back( 0 );
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m_circleConnectivities.push_back( i + 1 );
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if ( i == ( numSlices - 1 ) )
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{
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// Connect the last slice to the first slice
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m_circleConnectivities.push_back( 1 );
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}
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else
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{
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m_circleConnectivities.push_back( i + 2 );
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}
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}
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}
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