Kstars

equatorialcoordinategrid.cpp
1/*
2 SPDX-FileCopyrightText: 2012 Jerome SONRIER <jsid@emor3j.fr.eu.org>
3
4 SPDX-License-Identifier: GPL-2.0-or-later
5*/
6
7#include "equatorialcoordinategrid.h"
8
9#include "kstarsdata.h"
10#include "linelist.h"
11#include "Options.h"
12#ifdef KSTARS_LITE
13#include "skymaplite.h"
14#else
15#include "skymap.h"
16#endif
17#include "skypainter.h"
18
20 : CoordinateGrid(parent, i18n("Equatorial Coordinate Grid"))
21{
22 KStarsData *data = KStarsData::Instance();
23
24 intro();
25
26 double eps = 0.1;
27 double minRa = 0.0;
28 double maxRa = 23.0;
29 double dRa = 2.0;
30 double minDec = -80.0;
31 double maxDec = 90.0;
32 double dDec = 20.0;
33 double dDec2 = 4.0;
34 double dRa2 = 0.2;
35
36 double max, dec, dec2, ra, ra2;
37
38 std::shared_ptr<LineList> lineList;
39
40 for (ra = minRa; ra < maxRa; ra += dRa)
41 {
42 for (dec = -90.0; dec < maxDec - eps; dec += dDec)
43 {
44 lineList.reset(new LineList());
45 max = dec + dDec;
46 if (max > 90.0)
47 max = 90.0;
48 for (dec2 = dec; dec2 <= max + eps; dec2 += dDec2)
49 {
50 std::shared_ptr<SkyPoint> p(new SkyPoint(ra, dec2));
51
52 p->EquatorialToHorizontal(data->lst(), data->geo()->lat());
53 lineList->append(p);
54 }
55 appendLine(lineList);
56 }
57 }
58
59 for (dec = minDec; dec < maxDec + eps; dec += dDec)
60 {
61 // Do not paint the line on the equator
62 if (dec < 0.1 && dec > -0.1)
63 continue;
64
65 // Adjust point density
66 int nPoints = int(round(fabs(cos(dec * dms::PI / 180.0)) * dRa / dRa2));
67 if (nPoints < 5)
68 nPoints = 5;
69 double dRa3 = dRa / nPoints;
70
71 for (ra = minRa; ra < maxRa + eps; ra += dRa)
72 {
73 lineList.reset(new LineList());
74 for (ra2 = ra; ra2 <= ra + dRa + eps; ra2 += dRa3)
75 {
76 std::shared_ptr<SkyPoint> p(new SkyPoint(ra2, dec));
77
78 p->EquatorialToHorizontal(data->lst(), data->geo()->lat());
79 lineList->append(p);
80 }
81 appendLine(lineList);
82 }
83 }
84 summary();
85}
86
88{
89 if (Options::autoSelectGrid())
90 return (!Options::useAltAz());
91 else
92#ifndef KSTARS_LITE
93 return (Options::showEquatorialGrid() &&
94 !(Options::hideOnSlew() && Options::hideGrids() && SkyMap::IsSlewing()));
95#else
96 return (Options::showEquatorialGrid() &&
97 !(Options::hideOnSlew() && Options::hideGrids() && SkyMapLite::IsSlewing()));
98#endif
99}
100
102{
103 KStarsData *data = KStarsData::Instance();
104 QColor color = data->colorScheme()->colorNamed("EquatorialGridColor");
105 skyp->setPen(QPen(QBrush(color), 1, Qt::DotLine));
106}
QColor colorNamed(const QString &name) const
Retrieve a color by name.
Collection of all the circles in the coordinate grid.
void preDraw(SkyPainter *skyp) override
Gives the subclasses access to the top of the draw() method.
EquatorialCoordinateGrid(SkyComposite *parent)
Constructor Simply adds all of the equatorial coordinate grid circles (meridians and parallels) paren...
const CachingDms * lat() const
Definition geolocation.h:70
KStarsData is the backbone of KStars.
Definition kstarsdata.h:72
CachingDms * lst()
Definition kstarsdata.h:224
ColorScheme * colorScheme()
Definition kstarsdata.h:172
GeoLocation * geo()
Definition kstarsdata.h:230
void intro()
displays a message that we are loading m_name.
void summary()
prints out some summary statistics if the skyMesh debug is greater than 1.
void appendLine(const std::shared_ptr< LineList > &lineList)
Typically called from within a subclasses constructors.
A simple data container used by LineListIndex.
Definition linelist.h:25
SkyComposite is a kind of container class for SkyComponent objects.
Draws things on the sky, without regard to backend.
Definition skypainter.h:40
The sky coordinates of a point in the sky.
Definition skypoint.h:45
static constexpr double PI
PI is a const static member; it's public so that it can be used anywhere, as long as dms....
Definition dms.h:385
QString i18n(const char *text, const TYPE &arg...)
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