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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 "view.h" | |
22 | #include "viewport.h" | |
23 | ||
24 | #include "../../sigsession.h" | |
25 | #include "../../signal.h" | |
26 | ||
27 | #include "../../extdef.h" | |
28 | ||
29 | #include <QMouseEvent> | |
30 | #include <QTextStream> | |
31 | ||
32 | #include <math.h> | |
33 | ||
34 | #include <boost/foreach.hpp> | |
35 | ||
36 | using namespace boost; | |
37 | using namespace std; | |
38 | ||
39 | namespace pv { | |
40 | namespace view { | |
41 | ||
42 | const int Viewport::MinorTickSubdivision = 4; | |
43 | const int Viewport::ScaleUnits[3] = {1, 2, 5}; | |
44 | ||
45 | const QString Viewport::SIPrefixes[9] = | |
46 | {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"}; | |
47 | const int Viewport::FirstSIPrefixPower = -15; | |
48 | ||
49 | Viewport::Viewport(View &parent) : | |
50 | QGLWidget(&parent), | |
51 | _view(parent) | |
52 | { | |
53 | setMouseTracking(true); | |
54 | setAutoFillBackground(false); | |
55 | } | |
56 | ||
57 | int Viewport::get_total_height() const | |
58 | { | |
59 | int height = 0; | |
60 | BOOST_FOREACH(const shared_ptr<Signal> s, | |
61 | _view.session().get_signals()) { | |
62 | assert(s); | |
63 | height += View::SignalHeight; | |
64 | } | |
65 | ||
66 | return height; | |
67 | } | |
68 | ||
69 | void Viewport::initializeGL() | |
70 | { | |
71 | } | |
72 | ||
73 | void Viewport::resizeGL(int width, int height) | |
74 | { | |
75 | setup_viewport(width, height); | |
76 | } | |
77 | ||
78 | void Viewport::paintEvent(QPaintEvent *event) | |
79 | { | |
80 | int offset; | |
81 | ||
82 | const vector< shared_ptr<Signal> > &sigs = | |
83 | _view.session().get_signals(); | |
84 | ||
85 | // Prepare for OpenGL rendering | |
86 | makeCurrent(); | |
87 | glMatrixMode(GL_MODELVIEW); | |
88 | glPushMatrix(); | |
89 | ||
90 | setup_viewport(width(), height()); | |
91 | ||
92 | qglClearColor(Qt::white); | |
93 | glClear(GL_COLOR_BUFFER_BIT); | |
94 | ||
95 | // Plot the signal | |
96 | glEnable(GL_SCISSOR_TEST); | |
97 | glScissor(0, 0, width(), height()); | |
98 | offset = View::RulerHeight - _view.v_offset(); | |
99 | BOOST_FOREACH(const shared_ptr<Signal> s, sigs) | |
100 | { | |
101 | assert(s); | |
102 | ||
103 | const QRect signal_rect(0, offset, | |
104 | width(), View::SignalHeight); | |
105 | ||
106 | s->paint(*this, signal_rect, _view.scale(), _view.offset()); | |
107 | ||
108 | offset += View::SignalHeight; | |
109 | } | |
110 | ||
111 | glDisable(GL_SCISSOR_TEST); | |
112 | ||
113 | // Prepare for QPainter rendering | |
114 | glMatrixMode(GL_MODELVIEW); | |
115 | glPopMatrix(); | |
116 | ||
117 | QPainter painter(this); | |
118 | painter.setRenderHint(QPainter::Antialiasing); | |
119 | ||
120 | // Paint the ruler | |
121 | paint_ruler(painter); | |
122 | ||
123 | painter.end(); | |
124 | } | |
125 | ||
126 | void Viewport::mousePressEvent(QMouseEvent *event) | |
127 | { | |
128 | assert(event); | |
129 | ||
130 | _mouse_down_point = event->pos(); | |
131 | _mouse_down_offset = _view.offset(); | |
132 | } | |
133 | ||
134 | void Viewport::mouseMoveEvent(QMouseEvent *event) | |
135 | { | |
136 | assert(event); | |
137 | ||
138 | if(event->buttons() & Qt::LeftButton) | |
139 | { | |
140 | _view.set_scale_offset(_view.scale(), | |
141 | _mouse_down_offset + | |
142 | (_mouse_down_point - event->pos()).x() * | |
143 | _view.scale()); | |
144 | } | |
145 | } | |
146 | ||
147 | void Viewport::mouseReleaseEvent(QMouseEvent *event) | |
148 | { | |
149 | assert(event); | |
150 | } | |
151 | ||
152 | void Viewport::wheelEvent(QWheelEvent *event) | |
153 | { | |
154 | assert(event); | |
155 | _view.zoom(event->delta() / 120, event->x()); | |
156 | } | |
157 | ||
158 | void Viewport::setup_viewport(int width, int height) | |
159 | { | |
160 | glViewport(0, 0, (GLint)width, (GLint)height); | |
161 | glMatrixMode(GL_PROJECTION); | |
162 | glLoadIdentity(); | |
163 | glOrtho(0, width, height, 0, -1, 1); | |
164 | glMatrixMode(GL_MODELVIEW); | |
165 | } | |
166 | ||
167 | void Viewport::paint_ruler(QPainter &p) | |
168 | { | |
169 | const double MinSpacing = 80; | |
170 | ||
171 | const double min_period = _view.scale() * MinSpacing; | |
172 | ||
173 | const int order = (int)floorf(log10f(min_period)); | |
174 | const double order_decimal = pow(10, order); | |
175 | ||
176 | int unit = 0; | |
177 | double tick_period = 0.0f; | |
178 | ||
179 | do | |
180 | { | |
181 | tick_period = order_decimal * ScaleUnits[unit++]; | |
182 | } while(tick_period < min_period && unit < countof(ScaleUnits)); | |
183 | ||
184 | const int prefix = (order - FirstSIPrefixPower) / 3; | |
185 | assert(prefix >= 0); | |
186 | assert(prefix < countof(SIPrefixes)); | |
187 | ||
188 | const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
189 | Qt::AlignLeft | Qt::AlignTop, "8").height(); | |
190 | ||
191 | // Draw the tick marks | |
192 | p.setPen(Qt::black); | |
193 | ||
194 | const double minor_tick_period = tick_period / MinorTickSubdivision; | |
195 | const double first_major_division = | |
196 | floor(_view.offset() / tick_period); | |
197 | const double first_minor_division = | |
198 | ceil(_view.offset() / minor_tick_period); | |
199 | const double t0 = first_major_division * tick_period; | |
200 | ||
201 | int division = (int)round(first_minor_division - | |
202 | first_major_division * MinorTickSubdivision); | |
203 | while(1) | |
204 | { | |
205 | const double t = t0 + division * minor_tick_period; | |
206 | const double x = (t - _view.offset()) / _view.scale(); | |
207 | ||
208 | if(x >= width()) | |
209 | break; | |
210 | ||
211 | if(division % MinorTickSubdivision == 0) | |
212 | { | |
213 | // Draw a major tick | |
214 | QString s; | |
215 | QTextStream ts(&s); | |
216 | ts << (t / order_decimal) << SIPrefixes[prefix] << "s"; | |
217 | p.drawText(x, 0, 0, text_height, Qt::AlignCenter | Qt::AlignTop | | |
218 | Qt::TextDontClip, s); | |
219 | p.drawLine(x, text_height, x, View::RulerHeight); | |
220 | } | |
221 | else | |
222 | { | |
223 | // Draw a minor tick | |
224 | p.drawLine(x, | |
225 | (text_height + View::RulerHeight) / 2, x, | |
226 | View::RulerHeight); | |
227 | } | |
228 | ||
229 | division++; | |
230 | } | |
231 | } | |
232 | ||
233 | } // namespace view | |
234 | } // namespace pv |