hit_test() [2/2]

std::optional< uint32_t > MayaFlux::Portal::Forma::Layer::hit_test

(

glm::vec2

ndc

)

const

Return the topmost interactive, visible element containing ndc.

Traverses back-to-front. An element passes if:

1. bounds_hint is absent OR bounds_hint.contains(ndc) is true.
2. contains is absent OR contains(ndc) is true. An element with neither set never hits.

Parameters

ndc	Point in NDC space (x, y in [-1, +1]).

Returns

Element id, or nullopt if no element hit.

Definition at line 117 of file Layer.cpp.

{
    for (const auto& m_element : std::views::reverse(m_elements)) {
        if (test_element(m_element, ndc))
            return m_element.id;
    }
    return std::nullopt;
}

References m_elements, and test_element().

Referenced by hit_test().

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