Kstars

skypainter.cpp
1/*
2 SkyPainter: class for painting onto the sky for KStars
3 SPDX-FileCopyrightText: 2010 Henry de Valence <hdevalence@gmail.com>
4
5 SPDX-License-Identifier: GPL-2.0-or-later
6*/
7
8#include "skypainter.h"
9
10#include "skymap.h"
11#include "Options.h"
12#include "kstarsdata.h"
13#include "skycomponents/skiphashlist.h"
14#include "skycomponents/linelistlabel.h"
15#include "skyobjects/kscomet.h"
16#include "skyobjects/ksasteroid.h"
17#include "skyobjects/ksplanetbase.h"
18#include "skyobjects/trailobject.h"
19#include "skyobjects/constellationsart.h"
20
21SkyPainter::SkyPainter()
22{
23}
24
25void SkyPainter::setSizeMagLimit(float sizeMagLim)
26{
27 m_sizeMagLim = sizeMagLim;
28}
29
30float SkyPainter::starWidth(float mag) const
31{
32 //adjust maglimit for ZoomLevel
33 const double maxSize = 10.0;
34
35 double lgmin = log10(MINZOOM);
36 // double lgmax = log10(MAXZOOM);
37 double lgz = log10(Options::zoomFactor());
38
39 float sizeFactor = maxSize + (lgz - lgmin);
40
41 float size = (sizeFactor * (m_sizeMagLim - mag) / m_sizeMagLim) + 1.;
42 if (size <= 1.0)
43 size = 1.0;
44 if (size > maxSize)
45 size = maxSize;
46
47 return size;
48}
float starWidth(float mag) const
Get the width of a star of magnitude mag.
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