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79 lines
3.2 KiB
79 lines
3.2 KiB
/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz> |
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Permission is hereby granted, free of charge, to any person obtaining a |
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copy of this software and associated documentation files (the "Software"), |
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to deal in the Software without restriction, including without limitation |
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the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the |
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Software is furnished to do so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included |
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in all copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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DEALINGS IN THE SOFTWARE. |
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*/ |
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#include "Cylinder.h" |
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#include "Math/Functions.h" |
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#include "Math/Vector3.h" |
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namespace Magnum { namespace Primitives { |
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Cylinder::Cylinder(UnsignedInt rings, UnsignedInt segments, Float length, Flags flags): Capsule(segments, flags & Flag::GenerateTextureCoords ? TextureCoords::Generate : TextureCoords::DontGenerate) { |
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CORRADE_ASSERT(rings >= 1 && segments >= 3, "Cylinder must have at least one ring and three segments", ); |
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Float y = length*0.5f; |
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Float textureCoordsV = flags & Flag::CapEnds ? 1.0f/(length+2.0f) : 0.0f; |
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/* Bottom cap */ |
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if(flags & Flag::CapEnds) { |
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capVertex(-y, -1.0f, 0.0f); |
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capVertexRing(-y, textureCoordsV, Vector3::yAxis(-1.0f)); |
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} |
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/* Vertex rings */ |
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cylinderVertexRings(rings+1, -y, length/rings, textureCoordsV, length/(rings*(flags & Flag::CapEnds ? length + 2.0f : length))); |
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/* Top cap */ |
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if(flags & Flag::CapEnds) { |
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capVertexRing(y, 1.0f - textureCoordsV, Vector3::yAxis(1.0f)); |
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capVertex(y, 1.0f, 1.0f); |
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} |
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/* Faces */ |
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if(flags & Flag::CapEnds) bottomFaceRing(); |
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faceRings(rings, flags & Flag::CapEnds ? 1 : 0); |
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if(flags & Flag::CapEnds) topFaceRing(); |
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} |
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void Cylinder::capVertexRing(Float y, Float textureCoordsV, const Vector3& normal) { |
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Rad segmentAngleIncrement(2*Constants::pi()/segments); |
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for(UnsignedInt i = 0; i != segments; ++i) { |
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Rad segmentAngle(i*segmentAngleIncrement); |
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positions(0)->push_back({Math::sin(segmentAngle), y, Math::cos(segmentAngle)}); |
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normals(0)->push_back(normal); |
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if(textureCoords == TextureCoords::Generate) |
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textureCoords2D(0)->push_back({i*1.0f/segments, textureCoordsV}); |
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} |
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/* Duplicate first segment in the ring for additional vertex for texture coordinate */ |
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if(textureCoords == TextureCoords::Generate) { |
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positions(0)->push_back((*positions(0))[positions(0)->size()-segments]); |
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normals(0)->push_back(normal); |
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textureCoords2D(0)->push_back({1.0f, textureCoordsV}); |
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} |
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} |
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}}
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