OriginViewerSystem.h

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/*  Copyright (C) 2003-2021 Free Electron Organization
    Any use of this software requires a license.  If a valid license
    was not distributed with this file, visit freeelectron.org. */

/** @file */

namespace fe
{
namespace ext
{

/**
 * Displays world origin.
 */
class OriginViewerSystem : virtual public ViewerSystem
{
public:
    void draw(fe::Record viewportRecord) override
    {
        // Get the pointer to the draw interface.
        fe::hp<fe::ext::DrawI> draw =
                m_viewportAccessorSet.draw(viewportRecord);

        // draw origin
        const fe::Real pixelSizeOrigin = draw->view()->pixelSize(
            fe::SpatialVector(0,0,0),
            1.0f);
        const fe::Real pixelDesiredOrigin = 48.0f;
        fe::Real radiusOrigin = pixelDesiredOrigin/pixelSizeOrigin;
        fe::SpatialTransform identity;
        setIdentity(identity);

        const fe::Color black(0.0f,0.0f,0.0f);
        draw->drawTransformedMarker(
            identity,
            radiusOrigin,
            black);
    };
};

} /* namespace ext */
} /* namespace fe */