view/trace.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2013 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 <extdef.h>
  22
  23 #include <assert.h>
  24 #include <math.h>
  25
  26 #include "trace.h"
  27 #include "view.h"
  28
  29 namespace pv {
  30 namespace view {
  31
  32 const QPen Trace::AxisPen(QColor(128, 128, 128, 64));
  33 const int Trace::LabelHitPadding = 2;
  34
  35 Trace::Trace(pv::SigSession &session, QString name) :
  36         _session(session),
  37         _name(name),
  38         _v_offset(0)
  39 {
  40 }
  41
  42 QString Trace::get_name() const
  43 {
  44         return _name;
  45 }
  46
  47 void Trace::set_name(QString name)
  48 {
  49         _name = name;
  50 }
  51
  52 QColor Trace::get_colour() const
  53 {
  54         return _colour;
  55 }
  56
  57 void Trace::set_colour(QColor colour)
  58 {
  59         _colour = colour;
  60 }
  61
  62 int Trace::get_v_offset() const
  63 {
  64         return _v_offset;
  65 }
  66
  67 void Trace::set_v_offset(int v_offset)
  68 {
  69         _v_offset = v_offset;
  70 }
  71
  72 void Trace::set_view(pv::view::View *view)
  73 {
  74         assert(view);
  75         _view = view;
  76 }
  77
  78 void Trace::paint_back(QPainter &p, int left, int right)
  79 {
  80         (void)p;
  81         (void)left;
  82         (void)right;
  83 }
  84
  85 void Trace::paint_mid(QPainter &p, int left, int right)
  86 {
  87         (void)p;
  88         (void)left;
  89         (void)right;
  90 }
  91
  92 void Trace::paint_fore(QPainter &p, int left, int right)
  93 {
  94         (void)p;
  95         (void)left;
  96         (void)right;
  97 }
  98
  99 void Trace::paint_label(QPainter &p, int right, bool hover)
 100 {
 101         assert(_view);
 102         const int y = _v_offset - _view->v_offset();
 103
 104         p.setBrush(_colour);
 105
 106         if (!enabled())
 107                 return;
 108
 109         const QColor colour = get_colour();
 110
 111         compute_text_size(p);
 112         const QRectF label_rect = get_label_rect(right);
 113
 114         // Paint the label
 115         const QPointF points[] = {
 116                 label_rect.topLeft(),
 117                 label_rect.topRight(),
 118                 QPointF(right, y),
 119                 label_rect.bottomRight(),
 120                 label_rect.bottomLeft()
 121         };
 122
 123         const QPointF highlight_points[] = {
 124                 QPointF(label_rect.left() + 1, label_rect.top() + 1),
 125                 QPointF(label_rect.right(), label_rect.top() + 1),
 126                 QPointF(right - 1, y),
 127                 QPointF(label_rect.right(), label_rect.bottom() - 1),
 128                 QPointF(label_rect.left() + 1, label_rect.bottom() - 1)
 129         };
 130
 131         if (selected()) {
 132                 p.setPen(highlight_pen());
 133                 p.setBrush(Qt::transparent);
 134                 p.drawPolygon(points, countof(points));
 135         }
 136
 137         p.setPen(Qt::transparent);
 138         p.setBrush(hover ? colour.lighter() : colour);
 139         p.drawPolygon(points, countof(points));
 140
 141         p.setPen(colour.lighter());
 142         p.setBrush(Qt::transparent);
 143         p.drawPolygon(highlight_points, countof(highlight_points));
 144
 145         p.setPen(colour.darker());
 146         p.setBrush(Qt::transparent);
 147         p.drawPolygon(points, countof(points));
 148
 149         // Paint the text
 150         p.setPen(get_text_colour());
 151         p.drawText(label_rect, Qt::AlignCenter | Qt::AlignVCenter, _name);
 152 }
 153
 154 bool Trace::pt_in_label_rect(int left, int right, const QPoint &point)
 155 {
 156         (void)left;
 157
 158         const QRectF label = get_label_rect(right);
 159         return QRectF(
 160                 QPointF(label.left() - LabelHitPadding,
 161                         label.top() - LabelHitPadding),
 162                 QPointF(right, label.bottom() + LabelHitPadding)
 163                         ).contains(point);
 164 }
 165
 166 int Trace::get_y() const
 167 {
 168         return _v_offset - _view->v_offset();
 169 }
 170
 171 QColor Trace::get_text_colour() const
 172 {
 173         return (_colour.lightness() > 64) ? Qt::black : Qt::white;
 174 }
 175
 176 void Trace::paint_axis(QPainter &p, int y, int left, int right)
 177 {
 178         p.setPen(AxisPen);
 179         p.drawLine(QPointF(left, y + 0.5f), QPointF(right, y + 0.5f));
 180 }
 181
 182 void Trace::compute_text_size(QPainter &p)
 183 {
 184         _text_size = QSize(
 185                 p.boundingRect(QRectF(), 0, _name).width(),
 186                 p.boundingRect(QRectF(), 0, "Tg").height());
 187 }
 188
 189 QRectF Trace::get_label_rect(int right)
 190 {
 191         using pv::view::View;
 192
 193         assert(_view);
 194         const int y = _v_offset - _view->v_offset();
 195
 196         const QSizeF label_size(
 197                 _text_size.width() + View::LabelPadding.width() * 2,
 198                 ceilf((_text_size.height() + View::LabelPadding.height() * 2) / 2) * 2);
 199         const float label_arrow_length = label_size.height() / 2;
 200         return QRectF(
 201                 right - label_arrow_length - label_size.width() - 0.5,
 202                 y + 0.5f - label_size.height() / 2,
 203                 label_size.width(), label_size.height());
 204 }
 205
 206 } // namespace view
 207 } // namespace pv