cleanup and refactoring

raytracer/nvpro_core/imgui/imgui_axis.hpp

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2022-2023, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-FileCopyrightText: Copyright (c) 2014-2022 NVIDIA CORPORATION
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "imgui.h"
+#include <glm/glm.hpp>
+
+/*  @DOC_START -------------------------------------------------------
+ 
+ Function `Axis(ImVec2 pos, const glm::mat4& modelView, float size = 20.f)`
+ which display right-handed axis in a ImGui window.
+
+ Example
+
+ ```cpp
+       {  // Display orientation axis at the bottom left corner of the window
+        float  axisSize = 25.F;
+        ImVec2 pos      = ImGui::GetWindowPos();
+        pos.y += ImGui::GetWindowSize().y;
+        pos += ImVec2(axisSize * 1.1F, -axisSize * 1.1F) * ImGui::GetWindowDpiScale();  // Offset
+        ImGuiH::Axis(pos, CameraManip.getMatrix(), axisSize);
+      }
+```      
+
+--- @DOC_END ------------------------------------------------------- */
+
+// The API
+namespace ImGuiH {
+
+// This utility is adding the 3D axis at `pos`, using the matrix `modelView`
+IMGUI_API void Axis(ImVec2 pos, const glm::mat4& modelView, float size = 20.f);
+
+};  // namespace ImGuiH