XCEngine/editor/src/Viewport/SceneViewportHudOverlay.cpp

#include "SceneViewportHudOverlay.h"

#include "SceneViewportOrientationGizmo.h"

namespace XCEngine {
namespace Editor {
namespace {

bool IsViewportRectValid(const ImVec2& viewportMin, const ImVec2& viewportMax) {
    return viewportMax.x - viewportMin.x > 1.0f &&
        viewportMax.y - viewportMin.y > 1.0f;
}

} // namespace

void DrawSceneViewportHudOverlay(
    ImDrawList* drawList,
    const SceneViewportHudOverlayData& overlay,
    const ImVec2& viewportMin,
    const ImVec2& viewportMax) {
    if (drawList == nullptr ||
        !overlay.HasVisibleElements() ||
        !IsViewportRectValid(viewportMin, viewportMax)) {
        return;
    }

    drawList->PushClipRect(viewportMin, viewportMax, true);
    if (overlay.showOrientationGizmo) {
        DrawSceneViewportOrientationGizmo(
            drawList,
            overlay.sceneOverlay,
            viewportMin,
            viewportMax);
    }
    drawList->PopClipRect();
}

SceneViewportHudOverlayHitResult HitTestSceneViewportHudOverlay(
    const SceneViewportHudOverlayData& overlay,
    const ImVec2& viewportMin,
    const ImVec2& viewportMax,
    const ImVec2& mousePosition) {
    SceneViewportHudOverlayHitResult result = {};
    if (!overlay.HasVisibleElements() || !IsViewportRectValid(viewportMin, viewportMax)) {
        return result;
    }

    if (overlay.showOrientationGizmo) {
        const SceneViewportOrientationAxis axis = HitTestSceneViewportOrientationGizmo(
            overlay.sceneOverlay,
            viewportMin,
            viewportMax,
            mousePosition);
        if (axis != SceneViewportOrientationAxis::None) {
            result.kind = SceneViewportHudOverlayHitKind::OrientationAxis;
            result.orientationAxis = axis;
        }
    }

    return result;
}

} // namespace Editor
} // namespace XCEngine