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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 <QMouseEvent>
34 #include <QPainter>
35 #include <QTextStream>
36
37 #include <pv/widgets/popup.h>
38
39 using namespace boost;
40 using namespace std;
41
42 namespace pv {
43 namespace view {
44
45 const int Ruler::MinorTickSubdivision = 4;
46 const int Ruler::ScaleUnits[3] = {1, 2, 5};
47
48 const QString Ruler::SIPrefixes[9] =
49         {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"};
50 const int Ruler::FirstSIPrefixPower = -15;
51
52 const int Ruler::HoverArrowSize = 5;
53
54 Ruler::Ruler(View &parent) :
55         MarginWidget(parent),
56         _dragging(false)
57 {
58         setMouseTracking(true);
59
60         connect(&_view, SIGNAL(hover_point_changed()),
61                 this, SLOT(hover_point_changed()));
62 }
63
64 void Ruler::clear_selection()
65 {
66         CursorPair &cursors = _view.cursors();
67         cursors.first()->select(false);
68         cursors.second()->select(false);
69         update();
70 }
71
72 QString Ruler::format_time(double t, unsigned int prefix,
73         unsigned int precision)
74 {
75         const double multiplier = pow(10.0,
76                 - prefix * 3 - FirstSIPrefixPower);
77
78         QString s;
79         QTextStream ts(&s);
80         ts.setRealNumberPrecision(precision);
81         ts << fixed << forcesign << (t  * multiplier) <<
82                 SIPrefixes[prefix] << "s";
83         return s;
84 }
85
86 void Ruler::paintEvent(QPaintEvent*)
87 {
88         using namespace Qt;
89
90         const double SpacingIncrement = 32.0f;
91         const double MinValueSpacing = 32.0f;
92         const int ValueMargin = 3;
93
94         QPainter p(this);
95         p.setRenderHint(QPainter::Antialiasing);
96
97         double min_width = SpacingIncrement, typical_width;
98         double tick_period;
99         unsigned int prefix;
100
101         // Find tick spacing, and number formatting that does not cause
102         // value to collide.
103         do
104         {
105                 const double min_period = _view.scale() * min_width;
106
107                 const int order = (int)floorf(log10f(min_period));
108                 const double order_decimal = pow(10, order);
109
110                 unsigned int unit = 0;
111
112                 do
113                 {
114                         tick_period = order_decimal * ScaleUnits[unit++];
115                 } while (tick_period < min_period && unit < countof(ScaleUnits));
116
117                 prefix = (order - FirstSIPrefixPower) / 3;
118                 assert(prefix < countof(SIPrefixes));
119
120
121                 typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX,
122                         AlignLeft | AlignTop, format_time(_view.offset(),
123                         prefix)).width() + MinValueSpacing;
124
125                 min_width += SpacingIncrement;
126
127         } while(typical_width > tick_period / _view.scale());
128
129         const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX,
130                 AlignLeft | AlignTop, "8").height();
131
132         // Draw the tick marks
133         p.setPen(palette().color(foregroundRole()));
134
135         const double minor_tick_period = tick_period / MinorTickSubdivision;
136         const double first_major_division =
137                 floor(_view.offset() / tick_period);
138         const double first_minor_division =
139                 ceil(_view.offset() / minor_tick_period);
140         const double t0 = first_major_division * tick_period;
141
142         int division = (int)round(first_minor_division -
143                 first_major_division * MinorTickSubdivision) - 1;
144
145         const int major_tick_y1 = text_height + ValueMargin * 2;
146         const int tick_y2 = height();
147         const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2;
148
149         double x;
150
151         do {
152                 const double t = t0 + division * minor_tick_period;
153                 x = (t - _view.offset()) / _view.scale();
154
155                 if (division % MinorTickSubdivision == 0)
156                 {
157                         // Draw a major tick
158                         p.drawText(x, ValueMargin, 0, text_height,
159                                 AlignCenter | AlignTop | TextDontClip,
160                                 format_time(t, prefix));
161                         p.drawLine(QPointF(x, major_tick_y1),
162                                 QPointF(x, tick_y2));
163                 }
164                 else
165                 {
166                         // Draw a minor tick
167                         p.drawLine(QPointF(x, minor_tick_y1),
168                                 QPointF(x, tick_y2));
169                 }
170
171                 division++;
172
173         } while (x < width());
174
175         // Draw the cursors
176         if (_view.cursors_shown())
177                 _view.cursors().draw_markers(p, rect(), prefix);
178
179         // Draw the hover mark
180         draw_hover_mark(p);
181
182         p.end();
183 }
184
185 void Ruler::mouseMoveEvent(QMouseEvent *e)
186 {
187         if (!(e->buttons() & Qt::LeftButton))
188                 return;
189         
190         if ((e->pos() - _mouse_down_point).manhattanLength() <
191                 QApplication::startDragDistance())
192                 return;
193
194         _dragging = true;
195
196         if (shared_ptr<TimeMarker> m = _grabbed_marker.lock())
197                 m->set_time(_view.offset() +
198                         ((double)e->x() + 0.5) * _view.scale());
199 }
200
201 void Ruler::mousePressEvent(QMouseEvent *e)
202 {
203         if (e->buttons() & Qt::LeftButton)
204         {
205                 _mouse_down_point = e->pos();
206
207                 _grabbed_marker.reset();
208
209                 clear_selection();
210
211                 if (_view.cursors_shown()) {
212                         CursorPair &cursors = _view.cursors();
213                         if (cursors.first()->get_label_rect(
214                                 rect()).contains(e->pos()))
215                                 _grabbed_marker = cursors.first();
216                         else if (cursors.second()->get_label_rect(
217                                 rect()).contains(e->pos()))
218                                 _grabbed_marker = cursors.second();
219                 }
220
221                 if (shared_ptr<TimeMarker> m = _grabbed_marker.lock())
222                         m->select();
223
224                 selection_changed();
225         }
226 }
227
228 void Ruler::mouseReleaseEvent(QMouseEvent *)
229 {
230         using pv::widgets::Popup;
231
232         if (!_dragging)
233                 if (shared_ptr<TimeMarker> m = _grabbed_marker.lock()) {
234                         Popup *const p = m->create_popup(&_view);
235                         p->set_position(mapToGlobal(QPoint(m->get_x(),
236                                 height())), Popup::Bottom);
237                         p->show();
238                 }
239
240         _dragging = false;
241         _grabbed_marker.reset();
242 }
243
244 void Ruler::draw_hover_mark(QPainter &p)
245 {
246         const int x = _view.hover_point().x();
247
248         if (x == -1 || _dragging)
249                 return;
250
251         p.setPen(QPen(Qt::NoPen));
252         p.setBrush(QBrush(palette().color(foregroundRole())));
253
254         const int b = height() - 1;
255         const QPointF points[] = {
256                 QPointF(x, b),
257                 QPointF(x - HoverArrowSize, b - HoverArrowSize),
258                 QPointF(x + HoverArrowSize, b - HoverArrowSize)
259         };
260         p.drawPolygon(points, countof(points));
261 }
262
263 void Ruler::hover_point_changed()
264 {
265         update();
266 }
267
268 } // namespace view
269 } // namespace pv