File indexing completed on 2024-04-14 03:43:05

 /*
     SPDX-FileCopyrightText: 2007 James B. Bowlin <bowlin@mindspring.com>
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #pragma once
 
 #include <QPointF>
 #include <QString>
 
 class LineList;
 class Projector;
 class SkyLabeler;
 
 /**
     * @class LabelListIndex
     * An abstract parent class to be inherited by Ecliptic and Equator.
     *
     * @author James B. Bowlin
     * @version 0.1
     */
 class LineListLabel
 {
   public:
     explicit LineListLabel(const QString &text);
 
     enum
     {
         TopCandidate,
         BotCandidate,
         LeftCandidate,
         RightCandidate
     };
 
     /** @short prepare the context for selecting label position candidates. */
     void reset();
 
     /**
      * @short draw the label if any.  Is currently called at the bottom of draw() but that call could
      * be removed and it could be called externally AFTER draw() has been called so draw() can set
      * up the label position candidates.
      */
     void draw();
 
     void updateLabelCandidates(qreal x, qreal y, LineList *lineList, int i);
 
   private:
     /**
      * @short This routine does two things at once.  It returns the QPointF
      * corresponding to pointList[i] and also computes the angle using
      * pointList[i] and pointList[i-1] therefore you MUST ensure that:
      *
      *     1 <= i < pointList.size().
      */
     QPointF angleAt(const Projector *proj, LineList *list, int i, double *angle);
 
     const QString m_text;
     SkyLabeler *m_skyLabeler { nullptr };
 
     // these two arrays track/contain 4 candidate points
     int m_labIndex[4] { 0, 0, 0, 0 };
     LineList *m_labList[4] { nullptr, nullptr, nullptr, nullptr };
 
     float m_marginLeft { 0 };
     float m_marginRight { 0 };
     float m_marginTop { 0 };
     float m_marginBot { 0 };
     float m_farLeft { 0 };
     float m_farRight { 0 };
     float m_farTop { 0 };
     float m_farBot { 0 };
 };