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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 "sigview.h" | |
22 | ||
23 | #include "sigsession.h" | |
24 | #include "signal.h" | |
25 | ||
26 | #include "extdef.h" | |
27 | ||
28 | #include <QMouseEvent> | |
29 | #include <QTextStream> | |
30 | ||
31 | #include <math.h> | |
32 | ||
33 | #include <boost/foreach.hpp> | |
34 | ||
35 | using namespace boost; | |
36 | using namespace std; | |
37 | ||
38 | const int SigView::SignalHeight = 50; | |
39 | const int SigView::LabelMarginWidth = 70; | |
40 | const int SigView::RulerHeight = 30; | |
41 | ||
42 | const int SigView::ScaleUnits[3] = {1, 2, 5}; | |
43 | ||
44 | const QString SigView::SIPrefixes[9] = | |
45 | {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"}; | |
46 | const int SigView::FirstSIPrefixPower = -15; | |
47 | ||
48 | SigView::SigView(SigSession &session, QWidget *parent) : | |
49 | QGLWidget(parent), | |
50 | _session(session), | |
51 | _scale(1e-6), | |
52 | _offset(0) | |
53 | { | |
54 | connect(&_session, SIGNAL(dataUpdated()), | |
55 | this, SLOT(dataUpdated())); | |
56 | ||
57 | setMouseTracking(true); | |
58 | setAutoFillBackground(false); | |
59 | } | |
60 | ||
61 | void SigView::initializeGL() | |
62 | { | |
63 | } | |
64 | ||
65 | void SigView::resizeGL(int width, int height) | |
66 | { | |
67 | setupViewport(width, height); | |
68 | } | |
69 | ||
70 | void SigView::paintEvent(QPaintEvent *event) | |
71 | { | |
72 | int offset; | |
73 | ||
74 | const vector< shared_ptr<Signal> > &sigs = | |
75 | _session.get_signals(); | |
76 | ||
77 | // Prepare for OpenGL rendering | |
78 | makeCurrent(); | |
79 | glMatrixMode(GL_MODELVIEW); | |
80 | glPushMatrix(); | |
81 | ||
82 | setupViewport(width(), height()); | |
83 | ||
84 | qglClearColor(Qt::white); | |
85 | glClear(GL_COLOR_BUFFER_BIT); | |
86 | ||
87 | // Plot the signal | |
88 | offset = RulerHeight; | |
89 | BOOST_FOREACH(const shared_ptr<Signal> s, sigs) | |
90 | { | |
91 | assert(s); | |
92 | ||
93 | const QRect signal_rect(LabelMarginWidth, offset, | |
94 | width() - LabelMarginWidth, SignalHeight); | |
95 | ||
96 | s->paint(*this, signal_rect, _scale, _offset); | |
97 | ||
98 | offset += SignalHeight; | |
99 | } | |
100 | ||
101 | // Prepare for QPainter rendering | |
102 | glMatrixMode(GL_MODELVIEW); | |
103 | glPopMatrix(); | |
104 | ||
105 | QPainter painter(this); | |
106 | painter.setRenderHint(QPainter::Antialiasing); | |
107 | ||
108 | // Paint the labels | |
109 | offset = RulerHeight; | |
110 | BOOST_FOREACH(const shared_ptr<Signal> s, sigs) | |
111 | { | |
112 | assert(s); | |
113 | ||
114 | const QRect label_rect(0, offset, | |
115 | LabelMarginWidth, SignalHeight); | |
116 | s->paint_label(painter, label_rect); | |
117 | ||
118 | offset += SignalHeight; | |
119 | } | |
120 | ||
121 | // Paint the ruler | |
122 | paintRuler(painter); | |
123 | ||
124 | painter.end(); | |
125 | } | |
126 | ||
127 | void SigView::dataUpdated() | |
128 | { | |
129 | update(); | |
130 | } | |
131 | ||
132 | void SigView::mouseMoveEvent(QMouseEvent *event) | |
133 | { | |
134 | assert(event); | |
135 | } | |
136 | ||
137 | void SigView::mousePressEvent(QMouseEvent *event) | |
138 | { | |
139 | assert(event); | |
140 | } | |
141 | ||
142 | void SigView::mouseReleaseEvent(QMouseEvent *event) | |
143 | { | |
144 | assert(event); | |
145 | ||
146 | const double cursor_offset = _offset + _scale * (double)event->x(); | |
147 | ||
148 | switch(event->button()) | |
149 | { | |
150 | case Qt::LeftButton: | |
151 | _scale *= 2.0 / 3.0; | |
152 | break; | |
153 | ||
154 | case Qt::RightButton: | |
155 | _scale *= 3.0 / 2.0; | |
156 | break; | |
157 | } | |
158 | ||
159 | _offset = cursor_offset - _scale * (double)event->x(); | |
160 | ||
161 | update(); | |
162 | } | |
163 | ||
164 | void SigView::setupViewport(int width, int height) | |
165 | { | |
166 | glViewport(0, 0, (GLint)width, (GLint)height); | |
167 | glMatrixMode(GL_PROJECTION); | |
168 | glLoadIdentity(); | |
169 | glOrtho(0, width, height, 0, -1, 1); | |
170 | glMatrixMode(GL_MODELVIEW); | |
171 | } | |
172 | ||
173 | void SigView::paintRuler(QPainter &p) | |
174 | { | |
175 | const double MinSpacing = 80; | |
176 | ||
177 | const double min_period = _scale * MinSpacing; | |
178 | ||
179 | const int order = (int)floorf(log10f(min_period)); | |
180 | const double order_decimal = pow(10, order); | |
181 | ||
182 | int unit = 0; | |
183 | double tick_period = 0.0f; | |
184 | ||
185 | do | |
186 | { | |
187 | tick_period = order_decimal * ScaleUnits[unit++]; | |
188 | } while(tick_period < min_period && unit < countof(ScaleUnits)); | |
189 | ||
190 | const int prefix = (order - FirstSIPrefixPower) / 3; | |
191 | assert(prefix >= 0); | |
192 | assert(prefix < countof(SIPrefixes)); | |
193 | ||
194 | const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
195 | Qt::AlignLeft | Qt::AlignTop, "8").height(); | |
196 | ||
197 | // Draw the tick marks | |
198 | p.setPen(Qt::black); | |
199 | ||
200 | double t = ceil(_offset / tick_period) * tick_period; | |
201 | double x = 0.0; | |
202 | while((x = (t - _offset) / _scale + LabelMarginWidth) < width()) | |
203 | { | |
204 | QString s; | |
205 | QTextStream ts(&s); | |
206 | ts << (t / order_decimal) << SIPrefixes[prefix] << "s"; | |
207 | p.drawText(x, 0, 0, text_height, Qt::AlignCenter | Qt::AlignTop | | |
208 | Qt::TextDontClip, s); | |
209 | p.drawLine(x, text_height, x, RulerHeight); | |
210 | t += tick_period; | |
211 | } | |
212 | } |