stroke_bounds()

std::function< bool(glm::vec2)> MayaFlux::Kinesis::stroke_bounds ( std::span< const glm::vec2 >  points, float  half_thickness  )

inline

Containment test for a polyline with a uniform half-thickness.

Covers open and closed curves equally. A point is inside if its perpendicular distance to any segment is within half_thickness. Suitable for stroke-based interactive regions and cable hit testing.

Parameters

points	Ordered polyline vertices in NDC.
half_thickness	Distance threshold in NDC units.

Definition at line 267 of file Bounds.hpp.

{
    std::vector<glm::vec2> pts(points.begin(), points.end());
    float t2 = half_thickness * half_thickness;
    return [pts = std::move(pts), t2](glm::vec2 p) {
        for (size_t i = 0; i + 1 < pts.size(); ++i) {
            glm::vec2 a = pts[i];
            glm::vec2 b = pts[i + 1];
            glm::vec2 ab = b - a;
            float len2 = glm::dot(ab, ab);
            float d2 = 0.0F;
            if (len2 < 1e-12F) {
                glm::vec2 ap = p - a;
                d2 = glm::dot(ap, ap);
            } else {
                float t = glm::clamp(glm::dot(p - a, ab) / len2, 0.0F, 1.0F);
                glm::vec2 proj = a + t * ab;
                glm::vec2 diff = p - proj;
                d2 = glm::dot(diff, diff);
            }
            if (d2 <= t2)
                return true;
        }
        return false;
    };
}

References a, b, and points.

Referenced by MayaFlux::Portal::Forma::Geometry::stroke_slider().

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