source: ntrip/branches/BNC_2.12/qwtpolar/qwt_polar_marker.cpp@ 8142

Last change on this file since 8142 was 4272, checked in by mervart, 10 years ago
File size: 5.3 KB
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1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * QwtPolar Widget Library
3 * Copyright (C) 2008 Uwe Rathmann
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the Qwt License, Version 1.0
7 *****************************************************************************/
8
9#include "qwt_polar_marker.h"
10#include "qwt_polar.h"
11#include <qwt_scale_map.h>
12#include <qwt_symbol.h>
13#include <qwt_text.h>
14#include <qpainter.h>
15
16static const int LabelDist = 2;
17
18class QwtPolarMarker::PrivateData
19{
20public:
21 PrivateData():
22 align( Qt::AlignCenter )
23 {
24 symbol = new QwtSymbol();
25 }
26
27 ~PrivateData()
28 {
29 delete symbol;
30 }
31
32 QwtText label;
33 Qt::Alignment align;
34 QPen pen;
35 const QwtSymbol *symbol;
36
37 QwtPointPolar pos;
38};
39
40//! Sets alignment to Qt::AlignCenter, and style to NoLine
41QwtPolarMarker::QwtPolarMarker():
42 QwtPolarItem( QwtText( "Marker" ) )
43{
44 d_data = new PrivateData;
45
46 setItemAttribute( QwtPolarItem::AutoScale );
47 setZ( 30.0 );
48}
49
50//! Destructor
51QwtPolarMarker::~QwtPolarMarker()
52{
53 delete d_data;
54}
55
56//! \return QwtPolarItem::Rtti_PlotMarker
57int QwtPolarMarker::rtti() const
58{
59 return QwtPolarItem::Rtti_PolarMarker;
60}
61
62//! \return Position of the marker
63QwtPointPolar QwtPolarMarker::position() const
64{
65 return d_data->pos;
66}
67
68//! Change the position of the marker
69void QwtPolarMarker::setPosition( const QwtPointPolar &pos )
70{
71 if ( d_data->pos != pos )
72 {
73 d_data->pos = pos;
74 itemChanged();
75 }
76}
77
78/*!
79 Draw the marker
80
81 \param painter Painter
82 \param azimuthMap Maps azimuth values to values related to 0.0, M_2PI
83 \param radialMap Maps radius values into painter coordinates.
84 \param pole Position of the pole in painter coordinates
85 \param radius Radius of the complete plot area in painter coordinates
86 \param canvasRect Contents rect of the canvas in painter coordinates
87*/
88void QwtPolarMarker::draw( QPainter *painter,
89 const QwtScaleMap &azimuthMap, const QwtScaleMap &radialMap,
90 const QPointF &pole, double radius,
91 const QRectF &canvasRect ) const
92{
93 Q_UNUSED( radius );
94 Q_UNUSED( canvasRect );
95
96 const double r = radialMap.transform( d_data->pos.radius() );
97 const double a = azimuthMap.transform( d_data->pos.azimuth() );
98
99 const QPointF pos = qwtPolar2Pos( pole, r, a );
100
101
102 // draw symbol
103 QSize sSym( 0, 0 );
104 if ( d_data->symbol->style() != QwtSymbol::NoSymbol )
105 {
106 sSym = d_data->symbol->size();
107 d_data->symbol->drawSymbol( painter, pos );
108 }
109
110 // draw label
111 if ( !d_data->label.isEmpty() )
112 {
113 int xlw = qMax( int( d_data->pen.width() ), 1 );
114 int ylw = xlw;
115
116 int xlw1 = qMax( ( xlw + 1 ) / 2, ( sSym.width() + 1 ) / 2 ) + LabelDist;
117 xlw = qMax( xlw / 2, ( sSym.width() + 1 ) / 2 ) + LabelDist;
118 int ylw1 = qMax( ( ylw + 1 ) / 2, ( sSym.height() + 1 ) / 2 ) + LabelDist;
119 ylw = qMax( ylw / 2, ( sSym. height() + 1 ) / 2 ) + LabelDist;
120
121 QRect tr( QPoint( 0, 0 ), d_data->label.textSize( painter->font() ).toSize() );
122 tr.moveCenter( QPoint( 0, 0 ) );
123
124 int dx = pos.x();
125 int dy = pos.y();
126
127 if ( d_data->align & Qt::AlignTop )
128 dy += tr.y() - ylw1;
129 else if ( d_data->align & Qt::AlignBottom )
130 dy -= tr.y() - ylw1;
131
132 if ( d_data->align & Qt::AlignLeft )
133 dx += tr.x() - xlw1;
134 else if ( d_data->align & Qt::AlignRight )
135 dx -= tr.x() - xlw1;
136
137 tr.translate( dx, dy );
138 d_data->label.draw( painter, tr );
139 }
140}
141
142/*!
143 \brief Assign a symbol
144 \param symbol New symbol
145 \sa symbol()
146*/
147void QwtPolarMarker::setSymbol( const QwtSymbol *symbol )
148{
149 if ( d_data->symbol != symbol )
150 {
151 delete d_data->symbol;
152 d_data->symbol = symbol;
153 itemChanged();
154 }
155}
156
157/*!
158 \return the symbol
159 \sa setSymbol(), QwtSymbol
160*/
161const QwtSymbol *QwtPolarMarker::symbol() const
162{
163 return d_data->symbol;
164}
165
166/*!
167 \brief Set the label
168 \param label label text
169 \sa label()
170*/
171void QwtPolarMarker::setLabel( const QwtText& label )
172{
173 if ( label != d_data->label )
174 {
175 d_data->label = label;
176 itemChanged();
177 }
178}
179
180/*!
181 \return the label
182 \sa setLabel()
183*/
184QwtText QwtPolarMarker::label() const
185{
186 return d_data->label;
187}
188
189/*!
190 \brief Set the alignment of the label
191
192 The alignment determines where the label is drawn relative to
193 the marker's position.
194
195 \param align Alignment. A combination of AlignTop, AlignBottom,
196 AlignLeft, AlignRight, AlignCenter, AlgnHCenter,
197 AlignVCenter.
198 \sa labelAlignment()
199*/
200void QwtPolarMarker::setLabelAlignment( Qt::Alignment align )
201{
202 if ( align == d_data->align )
203 return;
204
205 d_data->align = align;
206 itemChanged();
207}
208
209/*!
210 \return the label alignment
211 \sa setLabelAlignment()
212*/
213Qt::Alignment QwtPolarMarker::labelAlignment() const
214{
215 return d_data->align;
216}
217
218/*!
219 Interval, that is necessary to display the item
220 This interval can be useful for operations like clipping or autoscaling
221
222 \param scaleId Scale index
223 \return bounding interval ( == position )
224
225 \sa position()
226*/
227QwtInterval QwtPolarMarker::boundingInterval( int scaleId ) const
228{
229 const double v = ( scaleId == QwtPolar::ScaleRadius )
230 ? d_data->pos.radius() : d_data->pos.azimuth();
231
232 return QwtInterval( v, v );
233}
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