Primitives: added 2D/3D Line primitive.

No shit. This is usable mainly if some common code expects the
mesh wrapped in MeshData and thus it is better to just have this tiny
class instead of doing it manually.

src/Primitives/CMakeLists.txt

@@ -29,6 +29,7 @@ set(MagnumPrimitives_SRCS
     Cube.cpp
     Cylinder.cpp
     Icosphere.cpp
+    Line.cpp
     Plane.cpp
     Square.cpp
     UVSphere.cpp)
@@ -40,6 +41,7 @@ set(MagnumPrimitives_HEADERS
     Cube.h
     Cylinder.h
     Icosphere.h
+    Line.h
     Plane.h
     Square.h
     UVSphere.h

src/Primitives/Line.cpp

@@ -0,0 +1,45 @@
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+*/
+
+#include "Line.h"
+
+#include "Math/Vector3.h"
+#include "Trade/MeshData2D.h"
+#include "Trade/MeshData3D.h"
+
+namespace Magnum { namespace Primitives {
+
+Trade::MeshData2D Line2D::wireframe() {
+    return Trade::MeshData2D(Mesh::Primitive::Lines, nullptr, {new std::vector<Vector2>{
+        {0.0f, 0.0f}, {1.0f, 0.0f}
+    }}, {});
+}
+
+Trade::MeshData3D Line3D::wireframe() {
+    return Trade::MeshData3D(Mesh::Primitive::Lines, nullptr, {new std::vector<Vector3>{
+        {0.0f, 0.0f, 0.0f}, {1.0f, 0.0f, 0.0f},
+    }}, {}, {});
+}
+
+}}

src/Primitives/Line.h

@@ -0,0 +1,67 @@
+#ifndef Magnum_Primitives_Line_h
+#define Magnum_Primitives_Line_h
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+*/
+
+/** @file
+ * @brief Class Magnum::Primitives::Line2D, Magnum::Primitives::Line3D
+ */
+
+#include "Trade/Trade.h"
+
+#include "Primitives/magnumPrimitivesVisibility.h"
+
+namespace Magnum { namespace Primitives {
+
+/**
+@brief 2D line primitive
+
+Unit-size line in direction of positive X axis. Non-indexed
+@ref Mesh::Primitive "Lines".
+*/
+class MAGNUM_PRIMITIVES_EXPORT Line2D {
+    public:
+        /** @brief Wireframe line */
+        static Trade::MeshData2D wireframe();
+
+        Line2D() = delete;
+};
+
+/**
+@brief 3D line primitive
+
+Unit-size line in direction of positive X axis. Non-indexed
+@ref Mesh::Primitive "Lines".
+*/
+class MAGNUM_PRIMITIVES_EXPORT Line3D {
+    public:
+        /** @brief Wireframe line */
+        static Trade::MeshData3D wireframe();
+
+        Line3D() = delete;
+};
+
+}}
+
+#endif