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