mapcanvas.h

/*
    SPDX-FileCopyrightText: 2001 Jason Harris <jharris@30doradus.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#ifndef MAPCANVAS_H
#define MAPCANVAS_H
 
#include <QFrame>
#include <QPixmap>
#include <QMouseEvent>
#include <QPaintEvent>
#include <geolocation.h>
 
/** @class MapCanvas
    *Used in LocationDialog for displaying a map of the Earth.
    *In addition, cities in the database are drawn as grey or white dots.
    *Also, the widget processes mouse clicks, to trim the list of
    *cities to those near the mouse click.
    *@short Widget used in the LocationDialog for displaying the world map.
    *@author Jason Harris
    *@version 1.0
    */
 
class LocationDialog;
class QPixmap;
 
class MapCanvas : public QFrame
{
    Q_OBJECT
  public:
    /**Default constructor.  Initialize the widget: create pixmaps, load the
         * world map image
         * @param parent pointer to the parent LocationDialog
         */
    explicit MapCanvas(QWidget *parent);
 
    /**Destructor (empty) */
    ~MapCanvas() override;
 
    /** Set location dialog */
    // FIXME: This is temporary plug
    void setLocationDialog(LocationDialog *loc) { ld = loc; }
  public slots:
    /**Set the geometry of the map widget (overloaded from QWidget).
         * Resizes the size of the map pixmap to match the widget, and resets
         * the Origin QPoint so it remains at the center of the widget.
         * @note this is called automatically by resize events.
         * @p x the x-position of the widget
         * @p y the y-position of the widget
         * @p w the width of the widget
         * @p h the height of the widget
         */
    virtual void setGeometry(int x, int y, int w, int h);
 
    /**Set the geometry of the map widget (overloaded from QWidget).
         * Resizes the size of the map pixmap to match the widget, and resets
         * the Origin QPoint so it remains at the center of the widget.
         * This function behaves just like the above function.  It differs
         * only in the data type of its argument.
         * @note this is called automatically by resize events.
         * @p r QRect describing geometry
         */
    virtual void setGeometry(const QRect &r);
 
  protected:
    /**Draw the map.  Draw grey dots on the locations of all cities,
         * and highlight the cities which match the current filters as
         * white dits.  Also draw a red crosshairs on the
         * currently-selected city.
         * @see LocationDialog
         */
    void paintEvent(QPaintEvent *e) override;
 
    /**Trim the list of cities so that only those within 2 degrees
         * of the mouse click are shown in the list.
         * @see LocationDialog
         */
    void mousePressEvent(QMouseEvent *e) override;
 
    /**Convert geo co-ordinates to a scaled position on the map*/
    void convertAndScale(QPoint &o, GeoLocation &g);
 
  private:
    LocationDialog *ld;
    QPixmap *bgImage;
    QString BGColor;
    QPoint origin;
    double xsize;
    double ysize;
    double ximage;
    double yimage;
    double ratio;
    double xscale;
    double yscale;
};
 
#endif