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ccdd3ef5 | 1 | /* |
b3f22de0 | 2 | * This file is part of the PulseView project. |
ccdd3ef5 JH |
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 | #include "view.h" | |
b3a7c013 | 23 | #include "viewport.h" |
ccdd3ef5 | 24 | |
cef18fc6 | 25 | #include <extdef.h> |
ccdd3ef5 JH |
26 | |
27 | #include <assert.h> | |
28 | #include <math.h> | |
29 | ||
b3a7c013 | 30 | #include <QMouseEvent> |
ccdd3ef5 JH |
31 | #include <QPainter> |
32 | #include <QTextStream> | |
33 | ||
f76af637 JH |
34 | using namespace std; |
35 | ||
ccdd3ef5 JH |
36 | namespace pv { |
37 | namespace view { | |
38 | ||
39 | const int Ruler::MinorTickSubdivision = 4; | |
40 | const int Ruler::ScaleUnits[3] = {1, 2, 5}; | |
41 | ||
42 | const QString Ruler::SIPrefixes[9] = | |
43 | {"f", "p", "n", QChar(0x03BC), "m", "", "k", "M", "G"}; | |
44 | const int Ruler::FirstSIPrefixPower = -15; | |
45 | ||
b3a7c013 JH |
46 | const int Ruler::HoverArrowSize = 5; |
47 | ||
ccdd3ef5 JH |
48 | Ruler::Ruler(View &parent) : |
49 | QWidget(&parent), | |
50 | _view(parent) | |
51 | { | |
b3a7c013 JH |
52 | setMouseTracking(true); |
53 | ||
54 | connect(&_view, SIGNAL(hover_point_changed()), | |
55 | this, SLOT(hover_point_changed())); | |
ccdd3ef5 JH |
56 | } |
57 | ||
58 | void Ruler::paintEvent(QPaintEvent *event) | |
59 | { | |
60 | QPainter p(this); | |
ce6e73a8 | 61 | p.setRenderHint(QPainter::Antialiasing); |
ccdd3ef5 JH |
62 | |
63 | const double MinSpacing = 80; | |
64 | ||
65 | const double min_period = _view.scale() * MinSpacing; | |
66 | ||
67 | const int order = (int)floorf(log10f(min_period)); | |
68 | const double order_decimal = pow(10, order); | |
69 | ||
cfa7293b | 70 | unsigned int unit = 0; |
ccdd3ef5 JH |
71 | double tick_period = 0.0f; |
72 | ||
73 | do | |
74 | { | |
75 | tick_period = order_decimal * ScaleUnits[unit++]; | |
76 | } while(tick_period < min_period && unit < countof(ScaleUnits)); | |
77 | ||
cfa7293b | 78 | const unsigned int prefix = (order - FirstSIPrefixPower) / 3; |
ccdd3ef5 JH |
79 | assert(prefix >= 0); |
80 | assert(prefix < countof(SIPrefixes)); | |
81 | ||
397c9541 | 82 | const double multiplier = pow(10.0, - prefix * 3 - FirstSIPrefixPower); |
1b5813fe | 83 | |
ccdd3ef5 JH |
84 | const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX, |
85 | Qt::AlignLeft | Qt::AlignTop, "8").height(); | |
86 | ||
87 | // Draw the tick marks | |
88 | p.setPen(Qt::black); | |
89 | ||
90 | const double minor_tick_period = tick_period / MinorTickSubdivision; | |
91 | const double first_major_division = | |
92 | floor(_view.offset() / tick_period); | |
93 | const double first_minor_division = | |
94 | ceil(_view.offset() / minor_tick_period); | |
95 | const double t0 = first_major_division * tick_period; | |
96 | ||
97 | int division = (int)round(first_minor_division - | |
98 | first_major_division * MinorTickSubdivision); | |
99 | while(1) | |
100 | { | |
101 | const double t = t0 + division * minor_tick_period; | |
102 | const double x = (t - _view.offset()) / _view.scale(); | |
103 | ||
104 | if(x >= width()) | |
105 | break; | |
106 | ||
107 | if(division % MinorTickSubdivision == 0) | |
108 | { | |
109 | // Draw a major tick | |
110 | QString s; | |
111 | QTextStream ts(&s); | |
1b5813fe | 112 | ts << (t * multiplier) << SIPrefixes[prefix] << "s"; |
ccdd3ef5 JH |
113 | p.drawText(x, 0, 0, text_height, Qt::AlignCenter | |
114 | Qt::AlignTop | Qt::TextDontClip, s); | |
ce6e73a8 JH |
115 | p.drawLine(QPointF(x, text_height), |
116 | QPointF(x, height())); | |
ccdd3ef5 JH |
117 | } |
118 | else | |
119 | { | |
120 | // Draw a minor tick | |
ce6e73a8 JH |
121 | p.drawLine(QPointF(x, (text_height + height()) / 2), |
122 | QPointF(x, height())); | |
ccdd3ef5 JH |
123 | } |
124 | ||
125 | division++; | |
126 | } | |
127 | ||
f76af637 JH |
128 | // Draw the cursors |
129 | draw_cursors(p); | |
130 | ||
b3a7c013 JH |
131 | // Draw the hover mark |
132 | draw_hover_mark(p); | |
133 | ||
ccdd3ef5 JH |
134 | p.end(); |
135 | } | |
136 | ||
f76af637 JH |
137 | void Ruler::draw_cursors(QPainter &p) |
138 | { | |
139 | if(!_view.cursors_shown()) | |
140 | return; | |
141 | ||
142 | const QRect r = rect(); | |
143 | pair<Cursor, Cursor> &cursors = _view.cursors(); | |
144 | cursors.first.paint_label(p, r); | |
145 | cursors.second.paint_label(p, r); | |
146 | } | |
147 | ||
b3a7c013 JH |
148 | void Ruler::draw_hover_mark(QPainter &p) |
149 | { | |
150 | const int x = _view.hover_point().x(); | |
151 | if(x == -1) | |
152 | return; | |
153 | ||
154 | p.setPen(QPen(Qt::NoPen)); | |
155 | p.setBrush(QBrush(QColor(Qt::black))); | |
156 | ||
157 | const int b = height() - 1; | |
158 | const QPointF points[] = { | |
159 | QPointF(x, b), | |
160 | QPointF(x - HoverArrowSize, b - HoverArrowSize), | |
161 | QPointF(x + HoverArrowSize, b - HoverArrowSize) | |
162 | }; | |
163 | p.drawPolygon(points, countof(points)); | |
164 | } | |
165 | ||
166 | void Ruler::hover_point_changed() | |
167 | { | |
168 | update(); | |
169 | } | |
170 | ||
ccdd3ef5 JH |
171 | } // namespace view |
172 | } // namespace pv |