2 * This file is part of the PulseView project.
4 * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
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.
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.
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
21 #ifndef PULSEVIEW_PV_VIEW_RULER_H
22 #define PULSEVIEW_PV_VIEW_RULER_H
26 #include "marginwidget.h"
31 class Ruler : public MarginWidget
36 static const int RulerHeight;
37 static const int MinorTickSubdivision;
38 static const int ScaleUnits[3];
40 static const int HoverArrowSize;
46 * Find a tick spacing and number formatting that does not cause
47 * the values to collide.
48 * @param p A QPainter used to determine the needed space for the values.
49 * @param scale A pv::view::View's scale.
50 * @param offset A pv::view::View's offset.
52 * @return The tick period to use in 'first' and the prefix in 'second'.
54 static std::pair<double, unsigned int> calculate_tick_spacing(
55 QPainter& p, double scale, double offset);
58 QSize sizeHint() const;
61 void paintEvent(QPaintEvent *event);
65 * Draw a hover arrow under the cursor position.
67 void draw_hover_mark(QPainter &p);
70 void hover_point_changed();
76 #endif // PULSEVIEW_PV_VIEW_RULER_H