radial()

MAYAFLUX_API Form< float > MayaFlux::Portal::Forma::Geometry::radial	(	Kinesis::AABB2D	region,
		float	angle_start,
		float	angle_end,
		glm::vec3	color = glm::vec3(0.9F),
		const std::function< glm::vec2()> &	live_offset = {}
	)

Geometry function for a radial indicator in NDC space.

Parameters

region	NDC region the arc is inscribed in.
angle_start	Start angle in radians (value = 0).
angle_end	End angle in radians (value = 1).
color	Line color.
live_offset	Optional. Current translation of the drawn indicator.

Definition at line 92 of file FormFactory.cpp.

{
    const glm::vec2 center = region.center();
    const float radius = std::min(region.width(), region.height()) * 0.5F;
 
    GeometryFn<float> fn = [center, radius, angle_start, angle_end, color, live_offset](
                               float v, std::vector<uint8_t>& out, Element& el) {
        const glm::vec2 shift = live_offset ? live_offset() : glm::vec2(0.F);
        const glm::vec2 live_center = center + shift;
 
        const float angle = angle_start + v * (angle_end - angle_start);
        const glm::vec2 tip = live_center + radius * glm::vec2(std::cos(angle), std::sin(angle));
 
        using V = Kakshya::LineVertex;
        const std::vector<V> verts = {
            { .position = { live_center.x, live_center.y, 0 }, .color = color },
            { .position = { tip.x, tip.y, 0 }, .color = color },
        };
 
        write_verts(out, verts);
 
        el.bounds_hint = Kinesis::AABB2D::from_ndc(live_center, glm::vec2(radius));
        el.contains = Kinesis::circular_bounds(live_center, radius);
    };
 
    return { std::move(fn),
        Graphics::PrimitiveTopology::LINE_LIST,
        static_cast<size_t>(2) * sizeof(Kakshya::LineVertex),
        drag_with<float>(Kinesis::angle_fraction(center, angle_start, angle_end, live_offset)) };
}

References MayaFlux::Kinesis::angle_fraction(), MayaFlux::Kinesis::AABB2D::center(), MayaFlux::Kinesis::circular_bounds(), color, MayaFlux::Kinesis::AABB2D::from_ndc(), MayaFlux::Kinesis::AABB2D::height(), MayaFlux::Portal::Graphics::LINE_LIST, out, MayaFlux::Kakshya::LineVertex::position, radius, MayaFlux::Kinesis::AABB2D::width(), and write_verts().

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