]> sigrok.org Git - pulseview.git/blob - pv/view/ruler.cpp
Moved RulerHeight out of View into Ruler
[pulseview.git] / pv / view / ruler.cpp
1 /*
2  * This file is part of the PulseView 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 "ruler.h"
22
23 #include "cursor.h"
24 #include "view.h"
25 #include "viewport.h"
26
27 #include <extdef.h>
28
29 #include <assert.h>
30 #include <math.h>
31 #include <limits.h>
32
33 #include <QApplication>
34 #include <QMouseEvent>
35 #include <QPainter>
36 #include <QTextStream>
37
38 #include <pv/widgets/popup.h>
39
40 using namespace boost;
41 using namespace std;
42
43 namespace pv {
44 namespace view {
45
46 const int Ruler::RulerHeight = 30;
47 const int Ruler::MinorTickSubdivision = 4;
48 const int Ruler::ScaleUnits[3] = {1, 2, 5};
49
50 const QString Ruler::SIPrefixes[9] =
51         {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
52 const int Ruler::FirstSIPrefixPower = -15;
53
54 const int Ruler::HoverArrowSize = 5;
55
56 Ruler::Ruler(View &parent) :
57         MarginWidget(parent),
58         _dragging(false)
59 {
60         setMouseTracking(true);
61
62         connect(&_view, SIGNAL(hover_point_changed()),
63                 this, SLOT(hover_point_changed()));
64 }
65
66 void Ruler::clear_selection()
67 {
68         CursorPair &cursors = _view.cursors();
69         cursors.first()->select(false);
70         cursors.second()->select(false);
71         update();
72 }
73
74 QString Ruler::format_time(double t, unsigned int prefix,
75         unsigned int precision)
76 {
77         const double multiplier = pow(10.0,
78                 (int)- prefix * 3 - FirstSIPrefixPower);
79
80         QString s;
81         QTextStream ts(&s);
82         ts.setRealNumberPrecision(precision);
83         ts << fixed << forcesign << (t  * multiplier) <<
84                 SIPrefixes[prefix] << "s";
85         return s;
86 }
87
88 QSize Ruler::sizeHint() const
89 {
90         return QSize(0, RulerHeight);
91 }
92
93 void Ruler::paintEvent(QPaintEvent*)
94 {
95         using namespace Qt;
96
97         const double SpacingIncrement = 32.0f;
98         const double MinValueSpacing = 32.0f;
99         const int ValueMargin = 3;
100
101         QPainter p(this);
102         p.setRenderHint(QPainter::Antialiasing);
103
104         double min_width = SpacingIncrement, typical_width;
105         double tick_period;
106         unsigned int prefix;
107
108         // Find tick spacing, and number formatting that does not cause
109         // value to collide.
110         do
111         {
112                 const double min_period = _view.scale() * min_width;
113
114                 const int order = (int)floorf(log10f(min_period));
115                 const double order_decimal = pow(10.0, order);
116
117                 unsigned int unit = 0;
118
119                 do
120                 {
121                         tick_period = order_decimal * ScaleUnits[unit++];
122                 } while (tick_period < min_period && unit < countof(ScaleUnits));
123
124                 prefix = (order - FirstSIPrefixPower) / 3;
125                 assert(prefix < countof(SIPrefixes));
126
127
128                 typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
129                         AlignLeft | AlignTop, format_time(_view.offset(),
130                         prefix)).width() + MinValueSpacing;
131
132                 min_width += SpacingIncrement;
133
134         } while(typical_width > tick_period / _view.scale());
135
136         const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
137                 AlignLeft | AlignTop, "8").height();
138
139         // Draw the tick marks
140         p.setPen(palette().color(foregroundRole()));
141
142         const double minor_tick_period = tick_period / MinorTickSubdivision;
143         const double first_major_division =
144                 floor(_view.offset() / tick_period);
145         const double first_minor_division =
146                 ceil(_view.offset() / minor_tick_period);
147         const double t0 = first_major_division * tick_period;
148
149         int division = (int)round(first_minor_division -
150                 first_major_division * MinorTickSubdivision) - 1;
151
152         const int major_tick_y1 = text_height + ValueMargin * 2;
153         const int tick_y2 = height();
154         const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2;
155
156         double x;
157
158         do {
159                 const double t = t0 + division * minor_tick_period;
160                 x = (t - _view.offset()) / _view.scale();
161
162                 if (division % MinorTickSubdivision == 0)
163                 {
164                         // Draw a major tick
165                         p.drawText(x, ValueMargin, 0, text_height,
166                                 AlignCenter | AlignTop | TextDontClip,
167                                 format_time(t, prefix));
168                         p.drawLine(QPointF(x, major_tick_y1),
169                                 QPointF(x, tick_y2));
170                 }
171                 else
172                 {
173                         // Draw a minor tick
174                         p.drawLine(QPointF(x, minor_tick_y1),
175                                 QPointF(x, tick_y2));
176                 }
177
178                 division++;
179
180         } while (x < width());
181
182         // Draw the cursors
183         if (_view.cursors_shown())
184                 _view.cursors().draw_markers(p, rect(), prefix);
185
186         // Draw the hover mark
187         draw_hover_mark(p);
188
189         p.end();
190 }
191
192 void Ruler::mouseMoveEvent(QMouseEvent *e)
193 {
194         if (!(e->buttons() & Qt::LeftButton))
195                 return;
196         
197         if ((e->pos() - _mouse_down_point).manhattanLength() <
198                 QApplication::startDragDistance())
199                 return;
200
201         _dragging = true;
202
203         if (shared_ptr<TimeMarker> m = _grabbed_marker.lock())
204                 m->set_time(_view.offset() +
205                         ((double)e->x() + 0.5) * _view.scale());
206 }
207
208 void Ruler::mousePressEvent(QMouseEvent *e)
209 {
210         if (e->buttons() & Qt::LeftButton)
211         {
212                 _mouse_down_point = e->pos();
213
214                 _grabbed_marker.reset();
215
216                 clear_selection();
217
218                 if (_view.cursors_shown()) {
219                         CursorPair &cursors = _view.cursors();
220                         if (cursors.first()->get_label_rect(
221                                 rect()).contains(e->pos()))
222                                 _grabbed_marker = cursors.first();
223                         else if (cursors.second()->get_label_rect(
224                                 rect()).contains(e->pos()))
225                                 _grabbed_marker = cursors.second();
226                 }
227
228                 if (shared_ptr<TimeMarker> m = _grabbed_marker.lock())
229                         m->select();
230
231                 selection_changed();
232         }
233 }
234
235 void Ruler::mouseReleaseEvent(QMouseEvent *)
236 {
237         using pv::widgets::Popup;
238
239         if (!_dragging)
240                 if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) {
241                         Popup *const p = m->create_popup(&_view);
242                         p->set_position(mapToGlobal(QPoint(m->get_x(),
243                                 height())), Popup::Bottom);
244                         p->show();
245                 }
246
247         _dragging = false;
248         _grabbed_marker.reset();
249 }
250
251 void Ruler::draw_hover_mark(QPainter &p)
252 {
253         const int x = _view.hover_point().x();
254
255         if (x == -1 || _dragging)
256                 return;
257
258         p.setPen(QPen(Qt::NoPen));
259         p.setBrush(QBrush(palette().color(foregroundRole())));
260
261         const int b = height() - 1;
262         const QPointF points[] = {
263                 QPointF(x, b),
264                 QPointF(x - HoverArrowSize, b - HoverArrowSize),
265                 QPointF(x + HoverArrowSize, b - HoverArrowSize)
266         };
267         p.drawPolygon(points, countof(points));
268 }
269
270 void Ruler::hover_point_changed()
271 {
272         update();
273 }
274
275 } // namespace view
276 } // namespace pv