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71 lines
2.9 KiB
71 lines
2.9 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 "Circle.h" |
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#include "Math/Functions.h" |
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#include "Math/Vector2.h" |
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#include "Mesh.h" |
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#include "Trade/MeshData2D.h" |
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namespace Magnum { namespace Primitives { |
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Trade::MeshData2D Circle::solid(UnsignedInt segments) { |
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CORRADE_ASSERT(segments >= 3, "Primitives::Circle::solid(): segments must be >= 3", |
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Trade::MeshData2D(MeshPrimitive::TriangleFan, std::vector<UnsignedInt>{}, std::vector<std::vector<Vector2>>{}, std::vector<std::vector<Vector2>>{})); |
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std::vector<Vector2> positions; |
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positions.reserve(segments+1); |
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/* Central point */ |
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positions.emplace_back(); |
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/* Points on circle */ |
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const Rad angleIncrement(2*Constants::pi()/segments); |
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for(UnsignedInt i = 0; i != segments; ++i) { |
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const Rad angle(Float(i)*angleIncrement); |
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positions.emplace_back(Math::cos(angle), Math::sin(angle)); |
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} |
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return Trade::MeshData2D(MeshPrimitive::TriangleFan, std::vector<UnsignedInt>{}, {std::move(positions)}, std::vector<std::vector<Vector2>>{}); |
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} |
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Trade::MeshData2D Circle::wireframe(UnsignedInt segments) { |
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CORRADE_ASSERT(segments >= 3, "Primitives::Circle::wireframe(): segments must be >= 3", |
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Trade::MeshData2D(MeshPrimitive::LineLoop, std::vector<UnsignedInt>{}, std::vector<std::vector<Vector2>>{}, std::vector<std::vector<Vector2>>{})); |
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std::vector<Vector2> positions; |
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positions.reserve(segments); |
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/* Points on circle */ |
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const Rad angleIncrement(2*Constants::pi()/segments); |
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for(UnsignedInt i = 0; i != segments; ++i) { |
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const Rad angle(Float(i)*angleIncrement); |
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positions.emplace_back(Math::cos(angle), Math::sin(angle)); |
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} |
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return Trade::MeshData2D(MeshPrimitive::LineLoop, std::vector<UnsignedInt>{}, {std::move(positions)}, std::vector<std::vector<Vector2>>{}); |
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} |
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}}
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