skycomposite.h

/*
    SPDX-FileCopyrightText: 2005 Thomas Kabelmann <thomas.kabelmann@gmx.de>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#pragma once
 
#include "skycomponent.h"
 
#include <QList>
#include <QMap>
 
class KSNumbers;
 
/**
 * @class SkyComposite
 * SkyComposite is a kind of container class for SkyComponent objects. The SkyComposite is
 * responsible for distributing calls to functions like draw() and update() to its children,
 * which can be SkyComponents or other SkyComposites with their own children. This is based
 * on the "composite/component" design pattern.
 *
 * Performance tuning: Sometimes it will be better to override a virtual function and do
 * the work in the composite instead of delegating the request to all sub components.
 *
 * @author Thomas Kabelmann
 * @version 0.1
 */
class SkyComposite : public SkyComponent
{
    public:
        /**
         * @short Constructor
         * @p parent pointer to the parent SkyComponent
         */
        explicit SkyComposite(SkyComposite *parent = nullptr);
 
        /** *@short Destructor */
        ~SkyComposite() override;
 
        /**
         * @short Delegate draw requests to all sub components
         * @p psky Reference to the QPainter on which to paint
         */
        void draw(SkyPainter *skyp) override;
 
        /**
         * @short Delegate update-position requests to all sub components
         *
         * This function usually just updates the Horizontal (Azimuth/Altitude) coordinates.
         * However, the precession and nutation must also be recomputed periodically. Requests to
         * do so are sent through the doPrecess parameter.
         * @p num Pointer to the KSNumbers object
         * @sa updatePlanets()
         * @sa updateMoons()
         * @note By default, the num parameter is nullptr, indicating that Precession/Nutation
         * computation should be skipped; this computation is only occasionally required.
         */
        void update(KSNumbers *num = nullptr) override;
 
        /**
         * @short Add a new sub component to the composite
         * @p comp Pointer to the SkyComponent to be added
         * @p priority A priority ordering for various operations on the list of all sky components
         * (notably objectNearest())
         */
        void addComponent(SkyComponent *comp, int priority = 1024);
 
        /**
         * @short Remove a sub component from the composite
         * @p comp Pointer to the SkyComponent to be removed.
         */
        void removeComponent(SkyComponent *const comp);
 
        /**
         * @short Search the children of this SkyComposite for a SkyObject whose name matches
         * the argument.
         *
         * The objects' primary, secondary and long-form names will all be checked for a match.
         * @p name the name to be matched
         * @p exact If true, it will return an exact match, otherwise it can return
         * a partial match.
         * @return a pointer to the SkyObject whose name matches
         * the argument, or a nullptr pointer if no match was found.
         */
        SkyObject *findByName(const QString &name, bool exact = true) override;
 
        /**
         * @short Identify the nearest SkyObject to the given SkyPoint, among the children of
         * this SkyComposite
         * @p p pointer to the SkyPoint around which to search.
         * @p maxrad reference to current search radius
         * @return a pointer to the nearest SkyObject
         */
        SkyObject *objectNearest(SkyPoint *p, double &maxrad) override;
 
        QList<SkyComponent *> components()
        {
            return m_Components.values();
        }
 
        QMultiMap<int, SkyComponent *> &componentsWithPriorities()
        {
            return m_Components;
        }
 
    private:
        QMultiMap<int, SkyComponent *> m_Components;
};