source: ntrip/trunk/BNC/qwt/qwt_plot_svgitem.cpp@ 6267

Last change on this file since 6267 was 4621, checked in by mervart, 12 years ago
File size: 5.0 KB
Line 
1/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#include "qwt_plot_svgitem.h"
11#include "qwt_scale_map.h"
12#include "qwt_legend.h"
13#include "qwt_legend_item.h"
14#include "qwt_painter.h"
15#include <qpainter.h>
16#include <qsvgrenderer.h>
17
18class QwtPlotSvgItem::PrivateData
19{
20public:
21 PrivateData()
22 {
23 }
24
25 QRectF boundingRect;
26 QSvgRenderer renderer;
27};
28
29/*!
30 \brief Constructor
31
32 Sets the following item attributes:
33 - QwtPlotItem::AutoScale: true
34 - QwtPlotItem::Legend: false
35
36 \param title Title
37*/
38QwtPlotSvgItem::QwtPlotSvgItem( const QString& title ):
39 QwtPlotItem( QwtText( title ) )
40{
41 init();
42}
43
44/*!
45 \brief Constructor
46
47 Sets the following item attributes:
48 - QwtPlotItem::AutoScale: true
49 - QwtPlotItem::Legend: false
50
51 \param title Title
52*/
53QwtPlotSvgItem::QwtPlotSvgItem( const QwtText& title ):
54 QwtPlotItem( title )
55{
56 init();
57}
58
59//! Destructor
60QwtPlotSvgItem::~QwtPlotSvgItem()
61{
62 delete d_data;
63}
64
65void QwtPlotSvgItem::init()
66{
67 d_data = new PrivateData();
68
69 setItemAttribute( QwtPlotItem::AutoScale, true );
70 setItemAttribute( QwtPlotItem::Legend, false );
71
72 setZ( 8.0 );
73}
74
75//! \return QwtPlotItem::Rtti_PlotSVG
76int QwtPlotSvgItem::rtti() const
77{
78 return QwtPlotItem::Rtti_PlotSVG;
79}
80
81/*!
82 Load a SVG file
83
84 \param rect Bounding rectangle
85 \param fileName SVG file name
86
87 \return true, if the SVG file could be loaded
88*/
89bool QwtPlotSvgItem::loadFile( const QRectF &rect,
90 const QString &fileName )
91{
92 d_data->boundingRect = rect;
93 const bool ok = d_data->renderer.load( fileName );
94 itemChanged();
95 return ok;
96}
97
98/*!
99 Load SVG data
100
101 \param rect Bounding rectangle
102 \param data in SVG format
103
104 \return true, if the SVG data could be loaded
105*/
106bool QwtPlotSvgItem::loadData( const QRectF &rect,
107 const QByteArray &data )
108{
109 d_data->boundingRect = rect;
110 const bool ok = d_data->renderer.load( data );
111 itemChanged();
112 return ok;
113}
114
115//! Bounding rect of the item
116QRectF QwtPlotSvgItem::boundingRect() const
117{
118 return d_data->boundingRect;
119}
120
121//! \return Renderer used to render the SVG data
122const QSvgRenderer &QwtPlotSvgItem::renderer() const
123{
124 return d_data->renderer;
125}
126
127//! \return Renderer used to render the SVG data
128QSvgRenderer &QwtPlotSvgItem::renderer()
129{
130 return d_data->renderer;
131}
132
133/*!
134 Draw the SVG item
135
136 \param painter Painter
137 \param xMap X-Scale Map
138 \param yMap Y-Scale Map
139 \param canvasRect Contents rect of the plot canvas
140*/
141void QwtPlotSvgItem::draw( QPainter *painter,
142 const QwtScaleMap &xMap, const QwtScaleMap &yMap,
143 const QRectF &canvasRect ) const
144{
145 const QRectF cRect = QwtScaleMap::invTransform(
146 xMap, yMap, canvasRect.toRect() );
147 const QRectF bRect = boundingRect();
148 if ( bRect.isValid() && cRect.isValid() )
149 {
150 QRectF rect = bRect;
151 if ( bRect.contains( cRect ) )
152 rect = cRect;
153
154 const QRectF r = QwtScaleMap::transform( xMap, yMap, rect );
155 render( painter, viewBox( rect ), r );
156 }
157}
158
159/*!
160 Render the SVG data
161
162 \param painter Painter
163 \param viewBox View Box, see QSvgRenderer::viewBox
164 \param rect Traget rectangle on the paint device
165*/
166void QwtPlotSvgItem::render( QPainter *painter,
167 const QRectF &viewBox, const QRectF &rect ) const
168{
169 if ( !viewBox.isValid() )
170 return;
171
172 QRectF r = rect;
173
174 if ( QwtPainter::roundingAlignment( painter ) )
175 {
176 r.setLeft ( qRound( r.left() ) );
177 r.setRight ( qRound( r.right() ) );
178 r.setTop ( qRound( r.top() ) );
179 r.setBottom ( qRound( r.bottom() ) );
180 }
181
182 d_data->renderer.setViewBox( viewBox );
183 d_data->renderer.render( painter, r );
184}
185
186/*!
187 Calculate the viewBox from an rect and boundingRect().
188
189 \param rect Rectangle in scale coordinates
190 \return viewBox View Box, see QSvgRenderer::viewBox
191*/
192QRectF QwtPlotSvgItem::viewBox( const QRectF &rect ) const
193{
194 const QSize sz = d_data->renderer.defaultSize();
195 const QRectF br = boundingRect();
196
197 if ( !rect.isValid() || !br.isValid() || sz.isNull() )
198 return QRectF();
199
200 QwtScaleMap xMap;
201 xMap.setScaleInterval( br.left(), br.right() );
202 xMap.setPaintInterval( 0, sz.width() );
203
204 QwtScaleMap yMap;
205 yMap.setScaleInterval( br.top(), br.bottom() );
206 yMap.setPaintInterval( sz.height(), 0 );
207
208 const double x1 = xMap.transform( rect.left() );
209 const double x2 = xMap.transform( rect.right() );
210 const double y1 = yMap.transform( rect.bottom() );
211 const double y2 = yMap.transform( rect.top() );
212
213 return QRectF( x1, y1, x2 - x1, y2 - y1 );
214}
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