ground/gcs/src/plugins/gcscontrol/joystickcontrol.cpp

   1 /**
   2  ******************************************************************************
   3  *
   4  * @file       joystickcontrol.cpp
   5  * @author     The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
   6  * @addtogroup GCSPlugins GCS Plugins
   7  * @{
   8  * @addtogroup GCSControlGadgetPlugin GCSControl Gadget Plugin
   9  * @{
  10  * @brief The plugin that mimics a transmitter joystick and updates the MCC
  11  *****************************************************************************/
  12 /*
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 3 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful, but
  19  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  20  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
  21  * for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License along
  24  * with this program; if not, write to the Free Software Foundation, Inc.,
  25  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  26  */
  27
  28 #include "joystickcontrol.h"
  29 #include "extensionsystem/pluginmanager.h"
  30 #include <QDebug>
  31 #include <QWidget>
  32 #include <QOpenGLWidget>
  33 #include <QMouseEvent>
  34
  35 /**
  36  * @brief Constructor for JoystickControl widget.  Sets up the image of a joystick
  37  */
  38 JoystickControl::JoystickControl(QWidget *parent) : QGraphicsView(parent)
  39 {
  40     setMinimumSize(64, 64);
  41     setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
  42     setScene(new QGraphicsScene(this));
  43     setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
  44
  45     m_renderer = new QSvgRenderer();
  46     bool test = m_renderer->load(QString(":/gcscontrol/images/joystick.svg"));
  47     Q_UNUSED(test);
  48     Q_ASSERT(test);
  49
  50     m_background = new QGraphicsSvgItem();
  51     m_background->setSharedRenderer(m_renderer);
  52     m_background->setElementId(QString("background"));
  53
  54     m_joystickEnd = new QGraphicsSvgItem();
  55     m_joystickEnd->setSharedRenderer(m_renderer);
  56     m_joystickEnd->setElementId(QString("joystickEnd"));
  57
  58     m_joystickArea = new QGraphicsSvgItem();
  59     m_joystickArea->setSharedRenderer(m_renderer);
  60     m_joystickArea->setElementId(QString("joystickArea"));
  61     m_joystickArea->setPos(
  62         (m_background->boundingRect().width() - m_joystickArea->boundingRect().width()) * 0.5,
  63         (m_background->boundingRect().height() - m_joystickArea->boundingRect().height()) * 0.5
  64         );
  65     m_joystickArea->setVisible(false);
  66
  67     QGraphicsScene *l_scene = scene();
  68     l_scene->clear(); // This also deletes all items contained in the scene.
  69     l_scene->addItem(m_background);
  70     l_scene->addItem(m_joystickArea);
  71     l_scene->addItem(m_joystickEnd);
  72     l_scene->setSceneRect(m_background->boundingRect());
  73
  74     changePosition(0.0, 0.0);
  75 }
  76
  77 JoystickControl::~JoystickControl()
  78 {
  79     // Do nothing
  80 }
  81
  82 /**
  83  * @brief Enables/Disables OpenGL
  84  */
  85 void JoystickControl::enableOpenGL(bool flag)
  86 {
  87     if (flag) {
  88         setViewport(new QOpenGLWidget()); // QGLFormat(QGL::SampleBuffers)));
  89     } else {
  90         setViewport(new QWidget);
  91     }
  92 }
  93
  94 /**
  95  * @brief Update the displayed position based on an MCC update
  96  */
  97 void JoystickControl::changePosition(double x, double y)
  98 {
  99     QRectF areaSize = m_joystickArea->boundingRect();
 100     QPointF point(
 101         ((1.0 + x) * areaSize.width() - m_joystickEnd->boundingRect().width()) * 0.5,
 102         ((1.0 - y) * areaSize.height() - m_joystickEnd->boundingRect().height()) * 0.5
 103         );
 104
 105     m_joystickEnd->setPos(m_joystickArea->mapToScene(point));
 106 }
 107
 108 /**
 109  * @brief Redirect mouse move events to control position
 110  */
 111 void JoystickControl::mouseMoveEvent(QMouseEvent *event)
 112 {
 113     QPointF point   = m_joystickArea->mapFromScene(mapToScene(event->pos()));
 114     QSizeF areaSize = m_joystickArea->boundingRect().size();
 115
 116     double y = -(point.y() / areaSize.height() - 0.5) * 2.0;
 117     double x = (point.x() / areaSize.width() - 0.5) * 2.0;
 118
 119     if (y < -1.0) {
 120         y = -1.0;
 121     }
 122     if (y > 1.0) {
 123         y = 1.0;
 124     }
 125     if (x < -1.0) {
 126         x = -1.0;
 127     }
 128     if (x > 1.0) {
 129         x = 1.0;
 130     }
 131
 132     emit positionClicked(x, y);
 133 }
 134
 135 /**
 136  * @brief Redirect mouse move clicks to control position
 137  */
 138 void JoystickControl::mousePressEvent(QMouseEvent *event)
 139 {
 140     if (event->button() == Qt::LeftButton) {
 141         mouseMoveEvent(event);
 142     }
 143 }
 144
 145 void JoystickControl::paint()
 146 {
 147     update();
 148 }
 149
 150 void JoystickControl::paintEvent(QPaintEvent *event)
 151 {
 152     // Skip painting until the image file is loaded
 153     if (!m_renderer->isValid()) {
 154         qDebug() << "Image file not loaded, not rendering";
 155     }
 156
 157     QGraphicsView::paintEvent(event);
 158 }
 159
 160 void JoystickControl::resizeEvent(QResizeEvent *event)
 161 {
 162     Q_UNUSED(event);
 163     fitInView(m_background, Qt::KeepAspectRatio);
 164 }
 165
 166 /**
 167  * @}
 168  * @}
 169  */