horizontal_fader()

MAYAFLUX_API Form< float > MayaFlux::Portal::Forma::Geometry::horizontal_fader	(	Kinesis::AABB2D	bounds,
		float	handle_w,
		glm::vec3	track_color = glm::vec3(0.3F),
		glm::vec3	handle_color = glm::vec3(0.9F),
		const std::function< glm::vec2()> &	live_offset = {}
	)

Geometry function for a horizontal fader in NDC space.

Parameters

bounds	Full extent of the fader in NDC.
handle_w	Handle width in NDC units.
track_color	Track quad color.
handle_color	Handle quad color.
live_offset	Optional. Current translation of the drawn fader, e.g. a Scrollable's live scroll offset. Shifts both the rendered geometry and the drag's cursor mapping.

Definition at line 18 of file FormFactory.cpp.

{
    GeometryFn<float> fn = [bounds, handle_w, track_color, handle_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 Kinesis::AABB2D live = bounds.translated(shift);
 
        float x = live.min.x + v * (live.width() - handle_w);
        float yt = live.min.y + live.height() * 0.35F;
        float yb = live.min.y + live.height() * 0.65F;
 
        Kinesis::AABB2D track { .min = glm::vec2(live.min.x, yt), .max = glm::vec2(live.max.x, yb) };
        Kinesis::AABB2D handle { .min = glm::vec2(x, live.min.y), .max = glm::vec2(x + handle_w, live.max.y) };
 
        const Kinesis::AABB2D fill { .min = track.min, .max = { x + handle_w * 0.5F, track.max.y } };
 
        auto verts = Kakshya::to_mesh_vertices(Kinesis::filled_rect(track, track_color));
        join_strip(verts, Kakshya::to_mesh_vertices(Kinesis::filled_rect(fill, glm::mix(track_color, handle_color, 0.5F))));
        join_strip(verts, Kakshya::to_mesh_vertices(Kinesis::filled_rect(handle, handle_color)));
 
        write_verts(out, verts);
 
        el.bounds_hint = handle;
        el.contains = {};
    };
 
    return { std::move(fn),
        Graphics::PrimitiveTopology::TRIANGLE_STRIP,
        static_cast<size_t>(16) * sizeof(Kakshya::MeshVertex),
        drag_with<float>(Kinesis::axis_fraction(bounds, handle_w, true, live_offset)) };
}

References MayaFlux::Kinesis::axis_fraction(), MayaFlux::Kinesis::filled_rect(), MayaFlux::Kinesis::AABB2D::height(), MayaFlux::Kinesis::AABB2D::max, MayaFlux::Kinesis::AABB2D::min, out, MayaFlux::Kakshya::to_mesh_vertices(), MayaFlux::Kinesis::AABB2D::translated(), MayaFlux::Portal::Graphics::TRIANGLE_STRIP, MayaFlux::Kinesis::AABB2D::width(), and write_verts().

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