Primitives: new axis2D() and axis3D() primitive.

Color-coded XY and XYZ axes, cut out of DebugTools::ObjectRender into a
better reusable piece of code. Using the new vertex color functionality
of mesh data.

src/Magnum/Primitives/Axis.cpp

@@ -0,0 +1,109 @@
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016
+              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 "Axis.h"
+
+#include "Magnum/Mesh.h"
+#include "Magnum/Math/Color.h"
+#include "Magnum/Trade/MeshData2D.h"
+#include "Magnum/Trade/MeshData3D.h"
+
+namespace Magnum { namespace Primitives {
+
+using namespace Math::Literals;
+
+Trade::MeshData2D axis2D() {
+    return Trade::MeshData2D{MeshPrimitive::Lines,
+        {0, 1,
+         1, 2, /* X axis */
+         1, 3,
+
+         4, 5,
+         5, 6, /* Y axis */
+         5, 7},
+        {{{ 0.0f,  0.0f},
+          { 1.0f,  0.0f}, /* X axis */
+          { 0.9f,  0.1f},
+          { 0.9f, -0.1f},
+
+          { 0.0f,  0.0f},
+          { 0.0f,  1.0f}, /* Y axis */
+          { 0.1f,  0.9f},
+          {-0.1f,  0.9f}}}, {},
+        {{0xff0000_rgbf,
+          0xff0000_rgbf, /* X axis */
+          0xff0000_rgbf,
+          0xff0000_rgbf,
+
+          0x00ff00_rgbf,
+          0x00ff00_rgbf, /* Y axis */
+          0x00ff00_rgbf,
+          0x00ff00_rgbf}}};
+}
+
+Trade::MeshData3D axis3D() {
+    return Trade::MeshData3D{MeshPrimitive::Lines,
+        {0, 1,
+         1, 2,  /* X axis */
+         1, 3,
+
+         4, 5,
+         5, 6,  /* Y axis */
+         5, 7,
+
+         8, 9,
+         9, 10, /* Z axis */
+         9, 11},
+        {{{ 0.0f,  0.0f,  0.0f},
+          { 1.0f,  0.0f,  0.0f}, /* X axis */
+          { 0.9f,  0.1f,  0.0f},
+          { 0.9f, -0.1f,  0.0f},
+
+          { 0.0f,  0.0f,  0.0f},
+          { 0.0f,  1.0f,  0.0f}, /* Y axis */
+          { 0.1f,  0.9f,  0.0f},
+          {-0.1f,  0.9f,  0.0f},
+
+          { 0.0f,  0.0f,  0.0f},
+          { 0.0f,  0.0f,  1.0f}, /* Z axis */
+          { 0.1f,  0.0f,  0.9f},
+          {-0.1f,  0.0f,  0.9f}}}, {}, {},
+        {{0xff0000_rgbf,
+          0xff0000_rgbf, /* X axis */
+          0xff0000_rgbf,
+          0xff0000_rgbf,
+
+          0x00ff00_rgbf,
+          0x00ff00_rgbf, /* Y axis */
+          0x00ff00_rgbf,
+          0x00ff00_rgbf,
+
+          0x0000ff_rgbf,
+          0x0000ff_rgbf, /* Z axis */
+          0x0000ff_rgbf,
+          0x0000ff_rgbf}}};
+}
+
+}}

src/Magnum/Primitives/Axis.h

@@ -0,0 +1,55 @@
+#ifndef Primitives_Axis_h
+#define Primitives_Axis_h
+/*
+    This file is part of Magnum.
+
+    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016
+              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 Function @ref Magnum::Primitives::axis2D(), @ref Magnum::Primitives::axis3D()
+ */
+
+#include "Magnum/Primitives/visibility.h"
+#include "Magnum/Trade/Trade.h"
+
+namespace Magnum { namespace Primitives {
+
+/**
+@brief 2D axis
+
+Two color-coded arrows for visualizing orientation (XY is RG). Indexed
+@ref MeshPrimitive::Lines with vertex colors.
+*/
+MAGNUM_PRIMITIVES_EXPORT Trade::MeshData2D axis2D();
+
+/**
+@brief 3D axis
+
+Three color-coded arrows for visualizing orientation (XYZ is RGB). Indexed
+@ref MeshPrimitive::Lines with vertex colors.
+*/
+MAGNUM_PRIMITIVES_EXPORT Trade::MeshData3D axis3D();
+
+}}
+
+#endif

src/Magnum/Primitives/CMakeLists.txt

@@ -24,6 +24,7 @@
 #
 
 set(MagnumPrimitives_SRCS
+    Axis.cpp
     Capsule.cpp
     Circle.cpp
     Crosshair.cpp
@@ -39,6 +40,7 @@ set(MagnumPrimitives_SRCS
     Implementation/WireframeSpheroid.cpp)
 
 set(MagnumPrimitives_HEADERS
+    Axis.h
     Capsule.h
     Circle.h
     Crosshair.h