Refine editor viewport and interaction workflow

editor/src/Viewport/SceneViewportOverlayRenderer.cpp

@@ -0,0 +1,82 @@
+#include "SceneViewportOverlayRenderer.h"
+#include "SceneViewportMath.h"
+
+namespace XCEngine {
+namespace Editor {
+
+namespace {
+
+Math::Matrix4x4 BuildOverlayViewMatrix(const SceneViewportOverlayData& overlay) {
+    return BuildSceneViewportViewMatrix(overlay);
+}
+
+void DrawAxisLabel(ImDrawList* drawList, const ImVec2& position, const char* label, ImU32 color) {
+    if (drawList == nullptr || label == nullptr) {
+        return;
+    }
+
+    const ImVec2 labelSize = ImGui::CalcTextSize(label);
+    drawList->AddText(
+        ImVec2(position.x - labelSize.x * 0.5f, position.y - labelSize.y * 0.5f),
+        color,
+        label);
+}
+
+void DrawSceneAxisWidget(
+    ImDrawList* drawList,
+    const SceneViewportOverlayData& overlay,
+    const ImVec2& viewportMin,
+    const ImVec2& viewportMax) {
+    if (drawList == nullptr || !overlay.valid) {
+        return;
+    }
+
+    const Math::Matrix4x4 view = BuildOverlayViewMatrix(overlay);
+    const ImVec2 center(viewportMax.x - 52.0f, viewportMin.y + 52.0f);
+    const float radius = 25.0f;
+
+    drawList->AddCircleFilled(center, radius + 12.0f, IM_COL32(17, 19, 22, 178), 24);
+    drawList->AddCircle(center, radius + 12.0f, IM_COL32(255, 255, 255, 30), 24, 1.0f);
+
+    struct AxisLine {
+        Math::Vector3 axis;
+        const char* label;
+        ImU32 color;
+    };
+
+    const AxisLine axes[] = {
+        { Math::Vector3::Right(), "x", IM_COL32(239, 83, 80, 255) },
+        { Math::Vector3::Up(), "y", IM_COL32(102, 187, 106, 255) },
+        { Math::Vector3::Forward(), "z", IM_COL32(66, 165, 245, 255) }
+    };
+
+    for (const AxisLine& axis : axes) {
+        const Math::Vector3 viewAxis = view.MultiplyVector(axis.axis);
+        const ImVec2 end(
+            center.x + viewAxis.x * radius,
+            center.y - viewAxis.y * radius);
+        drawList->AddLine(center, end, axis.color, 2.0f);
+        drawList->AddCircleFilled(end, 6.0f, axis.color, 16);
+        DrawAxisLabel(drawList, end, axis.label, IM_COL32(245, 245, 245, 255));
+    }
+}
+
+} // namespace
+
+void DrawSceneViewportOverlay(
+    ImDrawList* drawList,
+    const SceneViewportOverlayData& overlay,
+    const ImVec2& viewportMin,
+    const ImVec2& viewportMax,
+    const ImVec2& viewportSize) {
+    if (drawList == nullptr || !overlay.valid || viewportSize.x <= 1.0f || viewportSize.y <= 1.0f) {
+        return;
+    }
+
+    drawList->PushClipRect(viewportMin, viewportMax, true);
+    DrawSceneAxisWidget(drawList, overlay, viewportMin, viewportMax);
+    drawList->PopClipRect();
+}
+
+} // namespace Editor
+} // namespace XCEngine