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adb4b10c JH |
1 | /* |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <assert.h> | |
22 | #include <math.h> | |
23 | ||
24 | #include <boost/foreach.hpp> | |
25 | ||
26 | #include <QEvent> | |
27 | #include <QScrollBar> | |
28 | ||
29 | #include "sigview.h" | |
30 | ||
31 | #include "logicdata.h" | |
32 | #include "logicdatasnapshot.h" | |
33 | #include "sigsession.h" | |
34 | #include "sigviewport.h" | |
35 | ||
36 | using namespace boost; | |
37 | using namespace std; | |
38 | ||
39 | const double SigView::MaxScale = 1e9; | |
40 | const double SigView::MinScale = 1e-15; | |
41 | ||
42 | const int SigView::LabelMarginWidth = 70; | |
43 | const int SigView::RulerHeight = 30; | |
44 | ||
45 | SigView::SigView(SigSession &session, QWidget *parent) : | |
46 | QAbstractScrollArea(parent), | |
47 | _session(session), | |
48 | _viewport(new SigViewport(*this)), | |
49 | _data_length(0), | |
50 | _scale(1e-6), | |
51 | _offset(0), | |
52 | _v_offset(0) | |
53 | { | |
54 | connect(horizontalScrollBar(), SIGNAL(valueChanged(int)), | |
55 | this, SLOT(h_scroll_value_changed(int))); | |
56 | connect(verticalScrollBar(), SIGNAL(valueChanged(int)), | |
57 | this, SLOT(v_scroll_value_changed(int))); | |
58 | connect(&_session, SIGNAL(data_updated()), | |
59 | this, SLOT(data_updated())); | |
60 | setViewport(_viewport); | |
61 | } | |
62 | ||
63 | double SigView::scale() const | |
64 | { | |
65 | return _scale; | |
66 | } | |
67 | ||
68 | double SigView::offset() const | |
69 | { | |
70 | return _offset; | |
71 | } | |
72 | ||
73 | int SigView::v_offset() const | |
74 | { | |
75 | return _v_offset; | |
76 | } | |
77 | ||
78 | void SigView::zoom(double steps) | |
79 | { | |
80 | zoom(steps, (width() - LabelMarginWidth) / 2); | |
81 | } | |
82 | ||
83 | void SigView::set_scale_offset(double scale, double offset) | |
84 | { | |
85 | _scale = scale; | |
86 | _offset = offset; | |
87 | update_scroll(); | |
88 | _viewport->update(); | |
89 | } | |
90 | ||
91 | void SigView::update_scroll() | |
92 | { | |
93 | assert(_viewport); | |
94 | ||
95 | const QSize areaSize = _viewport->size(); | |
96 | ||
97 | // Set the horizontal scroll bar | |
98 | double length = 0, offset = 0; | |
99 | const shared_ptr<SignalData> sig_data = _session.get_data(); | |
100 | if(sig_data) { | |
101 | length = _data_length / | |
102 | (sig_data->get_samplerate() * _scale); | |
103 | offset = _offset / _scale; | |
104 | } | |
105 | ||
106 | horizontalScrollBar()->setPageStep(areaSize.width()); | |
107 | horizontalScrollBar()->setRange(0, | |
108 | max((int)(length - areaSize.width()), 0)); | |
109 | horizontalScrollBar()->setSliderPosition(offset); | |
110 | ||
111 | // Set the vertical scrollbar | |
112 | verticalScrollBar()->setPageStep(areaSize.height()); | |
113 | verticalScrollBar()->setRange(0, | |
114 | _viewport->get_total_height() - areaSize.height()); | |
115 | } | |
116 | ||
117 | void SigView::zoom(double steps, int offset) | |
118 | { | |
119 | const double cursor_offset = _offset + _scale * offset; | |
120 | _scale *= pow(3.0/2.0, -steps); | |
121 | _scale = max(min(_scale, MaxScale), MinScale); | |
122 | _offset = cursor_offset - _scale * offset; | |
123 | _viewport->update(); | |
124 | update_scroll(); | |
125 | } | |
126 | ||
127 | bool SigView::viewportEvent(QEvent *e) | |
128 | { | |
129 | switch(e->type()) { | |
130 | case QEvent::Paint: | |
131 | case QEvent::MouseButtonPress: | |
132 | case QEvent::MouseButtonRelease: | |
133 | case QEvent::MouseButtonDblClick: | |
134 | case QEvent::MouseMove: | |
135 | case QEvent::Wheel: | |
136 | return false; | |
137 | ||
138 | default: | |
139 | return QAbstractScrollArea::viewportEvent(e); | |
140 | } | |
141 | } | |
142 | ||
143 | void SigView::resizeEvent(QResizeEvent *e) | |
144 | { | |
145 | update_scroll(); | |
146 | } | |
147 | ||
148 | void SigView::h_scroll_value_changed(int value) | |
149 | { | |
150 | _offset = _scale * value; | |
151 | _viewport->update(); | |
152 | } | |
153 | ||
154 | void SigView::v_scroll_value_changed(int value) | |
155 | { | |
156 | _v_offset = value; | |
157 | _viewport->update(); | |
158 | } | |
159 | ||
160 | void SigView::data_updated() | |
161 | { | |
162 | // Get the new data length | |
163 | _data_length = 0; | |
164 | shared_ptr<LogicData> sig_data = _session.get_data(); | |
165 | if(sig_data) { | |
166 | deque< shared_ptr<LogicDataSnapshot> > &snapshots = | |
167 | sig_data->get_snapshots(); | |
168 | BOOST_FOREACH(shared_ptr<LogicDataSnapshot> s, snapshots) | |
169 | if(s) | |
170 | _data_length = max(_data_length, | |
171 | s->get_sample_count()); | |
172 | } | |
173 | ||
174 | // Update the scroll bars | |
175 | update_scroll(); | |
176 | ||
177 | // Repaint the view | |
178 | _viewport->update(); | |
179 | } |