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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" | |
ca4ec3ea | 22 | |
ccdd3ef5 | 23 | #include "view.h" |
f0c9f81c | 24 | #include "pv/util.h" |
ccdd3ef5 | 25 | |
cef18fc6 | 26 | #include <extdef.h> |
ccdd3ef5 | 27 | |
819f4c25 | 28 | using namespace Qt; |
f76af637 | 29 | |
ccdd3ef5 JH |
30 | namespace pv { |
31 | namespace view { | |
32 | ||
a6c1726e | 33 | const int Ruler::RulerHeight = 30; |
ccdd3ef5 JH |
34 | const int Ruler::MinorTickSubdivision = 4; |
35 | const int Ruler::ScaleUnits[3] = {1, 2, 5}; | |
36 | ||
b3a7c013 JH |
37 | const int Ruler::HoverArrowSize = 5; |
38 | ||
ccdd3ef5 | 39 | Ruler::Ruler(View &parent) : |
84a0d458 | 40 | MarginWidget(parent) |
ccdd3ef5 | 41 | { |
b3a7c013 JH |
42 | setMouseTracking(true); |
43 | ||
44 | connect(&_view, SIGNAL(hover_point_changed()), | |
45 | this, SLOT(hover_point_changed())); | |
ccdd3ef5 JH |
46 | } |
47 | ||
a6c1726e JH |
48 | QSize Ruler::sizeHint() const |
49 | { | |
50 | return QSize(0, RulerHeight); | |
51 | } | |
52 | ||
e314eca4 | 53 | void Ruler::paintEvent(QPaintEvent*) |
ccdd3ef5 | 54 | { |
f260e3bf | 55 | const int ValueMargin = 3; |
3f509c1f | 56 | |
ccdd3ef5 | 57 | QPainter p(this); |
ce6e73a8 | 58 | p.setRenderHint(QPainter::Antialiasing); |
ccdd3ef5 | 59 | |
abad24e2 JS |
60 | std::pair<double, unsigned int> spacing = |
61 | calculate_tick_spacing(p, _view.scale(), _view.offset()); | |
3f509c1f | 62 | |
abad24e2 JS |
63 | double tick_period = spacing.first; |
64 | unsigned int prefix = spacing.second; | |
1b5813fe | 65 | |
ccdd3ef5 | 66 | const int text_height = p.boundingRect(0, 0, INT_MAX, INT_MAX, |
3af62a24 | 67 | AlignLeft | AlignTop, "8").height(); |
ccdd3ef5 JH |
68 | |
69 | // Draw the tick marks | |
d2caed8d | 70 | p.setPen(palette().color(foregroundRole())); |
ccdd3ef5 JH |
71 | |
72 | const double minor_tick_period = tick_period / MinorTickSubdivision; | |
73 | const double first_major_division = | |
74 | floor(_view.offset() / tick_period); | |
75 | const double first_minor_division = | |
76 | ceil(_view.offset() / minor_tick_period); | |
77 | const double t0 = first_major_division * tick_period; | |
78 | ||
79 | int division = (int)round(first_minor_division - | |
64b678ba | 80 | first_major_division * MinorTickSubdivision) - 1; |
f260e3bf JH |
81 | |
82 | const int major_tick_y1 = text_height + ValueMargin * 2; | |
83 | const int tick_y2 = height(); | |
84 | const int minor_tick_y1 = (major_tick_y1 + tick_y2) / 2; | |
85 | ||
64b678ba | 86 | double x; |
ccdd3ef5 | 87 | |
64b678ba JH |
88 | do { |
89 | const double t = t0 + division * minor_tick_period; | |
90 | x = (t - _view.offset()) / _view.scale(); | |
ccdd3ef5 | 91 | |
333d5bbc | 92 | if (division % MinorTickSubdivision == 0) |
ccdd3ef5 JH |
93 | { |
94 | // Draw a major tick | |
f260e3bf JH |
95 | p.drawText(x, ValueMargin, 0, text_height, |
96 | AlignCenter | AlignTop | TextDontClip, | |
f0c9f81c | 97 | pv::util::format_time(t, prefix)); |
f260e3bf JH |
98 | p.drawLine(QPointF(x, major_tick_y1), |
99 | QPointF(x, tick_y2)); | |
ccdd3ef5 JH |
100 | } |
101 | else | |
102 | { | |
103 | // Draw a minor tick | |
f260e3bf JH |
104 | p.drawLine(QPointF(x, minor_tick_y1), |
105 | QPointF(x, tick_y2)); | |
ccdd3ef5 JH |
106 | } |
107 | ||
108 | division++; | |
64b678ba JH |
109 | |
110 | } while (x < width()); | |
ccdd3ef5 | 111 | |
b3a7c013 JH |
112 | // Draw the hover mark |
113 | draw_hover_mark(p); | |
ca4ec3ea JH |
114 | } |
115 | ||
b3a7c013 JH |
116 | void Ruler::draw_hover_mark(QPainter &p) |
117 | { | |
118 | const int x = _view.hover_point().x(); | |
333d5bbc | 119 | |
84a0d458 | 120 | if (x == -1) |
b3a7c013 JH |
121 | return; |
122 | ||
123 | p.setPen(QPen(Qt::NoPen)); | |
ad1d8e2b | 124 | p.setBrush(QBrush(palette().color(foregroundRole()))); |
b3a7c013 JH |
125 | |
126 | const int b = height() - 1; | |
127 | const QPointF points[] = { | |
128 | QPointF(x, b), | |
129 | QPointF(x - HoverArrowSize, b - HoverArrowSize), | |
130 | QPointF(x + HoverArrowSize, b - HoverArrowSize) | |
131 | }; | |
132 | p.drawPolygon(points, countof(points)); | |
133 | } | |
134 | ||
135 | void Ruler::hover_point_changed() | |
136 | { | |
137 | update(); | |
138 | } | |
139 | ||
abad24e2 JS |
140 | std::pair<double, unsigned int> Ruler::calculate_tick_spacing( |
141 | QPainter& p, double scale, double offset) | |
142 | { | |
143 | const double SpacingIncrement = 32.0f; | |
144 | const double MinValueSpacing = 32.0f; | |
145 | ||
146 | double min_width = SpacingIncrement, typical_width; | |
147 | ||
148 | double tick_period; | |
149 | unsigned int prefix; | |
150 | ||
151 | do { | |
152 | const double min_period = scale * min_width; | |
153 | ||
154 | const int order = (int)floorf(log10f(min_period)); | |
155 | const double order_decimal = pow(10.0, order); | |
156 | ||
157 | unsigned int unit = 0; | |
158 | ||
159 | do { | |
160 | tick_period = order_decimal * ScaleUnits[unit++]; | |
161 | } while (tick_period < min_period && unit < countof(ScaleUnits)); | |
162 | ||
163 | prefix = (order - pv::util::FirstSIPrefixPower) / 3; | |
164 | ||
165 | typical_width = p.boundingRect(0, 0, INT_MAX, INT_MAX, | |
166 | AlignLeft | AlignTop, pv::util::format_time(offset, | |
167 | prefix)).width() + MinValueSpacing; | |
168 | ||
169 | min_width += SpacingIncrement; | |
170 | ||
171 | } while(typical_width > tick_period / scale); | |
172 | ||
173 | return std::make_pair(tick_period, prefix); | |
174 | } | |
175 | ||
ccdd3ef5 JH |
176 | } // namespace view |
177 | } // namespace pv |