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107 lines
3.7 KiB
107 lines
3.7 KiB
/* |
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This file is part of Magnum. |
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, |
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2020, 2021, 2022, 2023, 2024, 2025, 2026 |
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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 "Arrow.h" |
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#include "Magnum/Mesh.h" |
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#include "Magnum/Math/Vector3.h" |
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#include "Magnum/Trade/MeshData.h" |
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namespace Magnum { namespace Primitives { |
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namespace { |
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/* not 8-bit because GPUs (and Vulkan) don't like it nowadays */ |
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constexpr UnsignedShort Indices[]{ |
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0, 1, |
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1, 2, |
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1, 3 |
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}; |
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constexpr Trade::MeshAttributeData Attributes2D[]{ |
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Trade::MeshAttributeData{Trade::MeshAttribute::Position, |
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VertexFormat::Vector2, 0, 4, sizeof(Vector2)}, |
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}; |
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} |
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Trade::MeshData arrow2D(const Vector2& a, const Vector2& b) { |
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Containers::Array<char> vertexData{NoInit, sizeof(Vector2)*4}; |
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auto positions = Containers::arrayCast<Vector2>(vertexData); |
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/* Line */ |
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positions[0] = a; |
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positions[1] = b; |
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/* Arrowhead */ |
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const Vector2 direction = (b - a).resized(0.1f); |
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const Vector2 perpendicular = direction.perpendicular(); |
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positions[2] = b - direction - perpendicular; |
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positions[3] = b - direction + perpendicular; |
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return Trade::MeshData{MeshPrimitive::Lines, |
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Trade::DataFlag::Global, Indices, Trade::MeshIndexData{Indices}, |
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Utility::move(vertexData), Trade::meshAttributeDataNonOwningArray(Attributes2D)}; |
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} |
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namespace { |
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constexpr Trade::MeshAttributeData Attributes3D[]{ |
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Trade::MeshAttributeData{Trade::MeshAttribute::Position, |
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VertexFormat::Vector3, 0, 4, sizeof(Vector3)}, |
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}; |
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} |
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Trade::MeshData arrow3D(const Vector3& a, const Vector3& b, const Vector3& tangent) { |
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Containers::Array<char> vertexData{NoInit, sizeof(Vector3)*4}; |
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auto positions = Containers::arrayCast<Vector3>(vertexData); |
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/* Line */ |
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positions[0] = a; |
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positions[1] = b; |
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/* Arrowhead. The perpendicular sign is flipped compared to the 2D version |
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to have vertex positions match the 2D version in the default |
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orientation. */ |
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const Vector3 direction = (b - a).resized(0.1f); |
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const Vector3 perpendicular = Math::cross(direction, tangent).resized(0.1f); |
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positions[2] = b - direction + perpendicular; |
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positions[3] = b - direction - perpendicular; |
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return Trade::MeshData{MeshPrimitive::Lines, |
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Trade::DataFlag::Global, Indices, Trade::MeshIndexData{Indices}, |
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Utility::move(vertexData), Trade::meshAttributeDataNonOwningArray(Attributes3D)}; |
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} |
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Trade::MeshData arrow2D() { |
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return arrow2D({0.0f, 0.0f}, {1.0f, 0.0f}); |
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} |
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Trade::MeshData arrow3D() { |
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return arrow3D({0.0f, 0.0f, 0.0f}, {1.0f, 0.0f, 0.0f}); |
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} |
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}}
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