position_picker()

MAYAFLUX_API Form< glm::vec2 > MayaFlux::Portal::Forma::Geometry::position_picker	(	Kinesis::AABB2D	bounds,
		glm::vec3	color = glm::vec3(0.9F),
		float	size = 8.0F
	)

Geometry function for a 2D position picker in NDC space.

Parameters

bounds	Full extent of the pick area in NDC.
color	Point color.
size	Point size in pixels.

Definition at line 123 of file FormFactory.cpp.

{
    GeometryFn<glm::vec2> fn = [bounds, color, size](
                                   glm::vec2 v, std::vector<uint8_t>& out, Element& el) {
        float x = bounds.min.x + v.x * bounds.width();
        float y = bounds.min.y + v.y * bounds.height();
 
        using V = Kakshya::PointVertex;
        std::vector<V> verts = {
            { .position = { x, y, 0 }, .color = color, .size = size },
        };
 
        write_verts(out, verts);
 
        el.bounds_hint = bounds;
        el.contains = Kinesis::polygon_bounds(std::span<const glm::vec2> {
            std::array<glm::vec2, 4> {
                bounds.min,
                glm::vec2(bounds.max.x, bounds.min.y),
                bounds.max,
                glm::vec2(bounds.min.x, bounds.max.y) } });
    };
 
    return { std::move(fn),
        Graphics::PrimitiveTopology::POINT_LIST,
        sizeof(Kakshya::PointVertex),
        drag_with<glm::vec2>(Kinesis::unit_square(bounds)) };
}

References MayaFlux::Kinesis::AABB2D::contains(), MayaFlux::Kinesis::AABB2D::height(), MayaFlux::Kinesis::AABB2D::max, MayaFlux::Kinesis::AABB2D::min, MayaFlux::Portal::Graphics::POINT_LIST, MayaFlux::Kinesis::polygon_bounds(), MayaFlux::Kakshya::PointVertex::position, MayaFlux::Kinesis::unit_square(), MayaFlux::Kinesis::AABB2D::width(), and write_verts().

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