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examples/realtime/MainWindow.cpp

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#include "RandomPlot.h"
+#include "MainWindow.h"
+#include "start.xpm"
+#include "clear.xpm"
+
+#include <QAction>
+#include <QLabel>
+#include <QLayout>
+#include <QStatusBar>
+#include <QToolBar>
+#include <QSpinBox>
+#include <QCheckBox>
+#include <QWhatsThis>
+#include <QPixmap>
+
+namespace
+{
+    class ToolBar : public QToolBar
+    {
+      public:
+        ToolBar( QMainWindow* parent )
+            : QToolBar( parent )
+        {
+        }
+
+        void addSpacing( int spacing )
+        {
+            QLabel* label = new QLabel();
+            label->setFixedWidth( spacing );
+
+            addWidget( label );
+        }
+    };
+}
+
+class Counter : public QWidget
+{
+  public:
+    Counter( const QString& prefix, const QString& suffix,
+            int min, int max, int step, QWidget* parent = NULL )
+        : QWidget( parent )
+    {
+        QHBoxLayout* layout = new QHBoxLayout( this );
+
+        if ( !prefix.isEmpty() )
+            layout->addWidget( new QLabel( prefix + " " ) );
+
+        m_counter = new QSpinBox();
+        m_counter->setRange( min, max );
+        m_counter->setSingleStep( step );
+
+        layout->addWidget( m_counter );
+
+        if ( !suffix.isEmpty() )
+            layout->addWidget( new QLabel( QString( " " ) + suffix ) );
+    }
+
+    void setValue( int value ) { m_counter->setValue( value ); }
+    int value() const { return m_counter->value(); }
+
+  private:
+    QSpinBox* m_counter;
+};
+
+MainWindow::MainWindow()
+{
+    addToolBar( toolBar() );
+#ifndef QT_NO_STATUSBAR
+    ( void )statusBar();
+#endif
+
+    m_plot = new RandomPlot();
+
+    const int margin = 4;
+    m_plot->setContentsMargins( margin, margin, margin, margin );
+
+    setCentralWidget( m_plot );
+
+    connect( m_startAction, SIGNAL(toggled(bool)), this, SLOT(appendPoints(bool)) );
+    connect( m_clearAction, SIGNAL(triggered()), m_plot, SLOT(clear()) );
+    connect( m_symbolType, SIGNAL(toggled(bool)), m_plot, SLOT(showSymbols(bool)) );
+    connect( m_plot, SIGNAL(running(bool)), this, SLOT(showRunning(bool)) );
+    connect( m_plot, SIGNAL(elapsed(int)), this, SLOT(showElapsed(int)) );
+
+    initWhatsThis();
+
+    setContextMenuPolicy( Qt::NoContextMenu );
+}
+
+QToolBar* MainWindow::toolBar()
+{
+    setToolButtonStyle( Qt::ToolButtonTextUnderIcon );
+    setIconSize( QSize( 22, 22 ) );
+
+    m_startAction = new QAction( QPixmap( start_xpm ), "Start", this );
+    m_startAction->setCheckable( true );
+    m_clearAction = new QAction( QPixmap( clear_xpm ), "Clear", this );
+
+    QAction* whatsThisAction = QWhatsThis::createAction();
+    whatsThisAction->setText( "Help" );
+
+    QWidget* hBox = new QWidget();
+
+    m_symbolType = new QCheckBox( "Symbols", hBox );
+    m_symbolType->setChecked( true );
+
+    m_randomCount = new Counter( "Points", QString(), 1, 100000, 100 );
+    m_randomCount->setValue( 1000 );
+
+    m_timerCount = new Counter( "Delay", "ms", 0, 100000, 100 );
+    m_timerCount->setValue( 0 );
+
+    QHBoxLayout* layout = new QHBoxLayout( hBox );
+    layout->setContentsMargins( QMargins() );
+    layout->setSpacing( 0 );
+    layout->addSpacing( 10 );
+    layout->addWidget( new QWidget( hBox ), 10 ); // spacer
+    layout->addWidget( m_symbolType );
+    layout->addSpacing( 5 );
+    layout->addWidget( m_randomCount );
+    layout->addSpacing( 5 );
+    layout->addWidget( m_timerCount );
+
+    showRunning( false );
+
+    ToolBar* toolBar = new ToolBar( this );
+    toolBar->setAllowedAreas( Qt::TopToolBarArea | Qt::BottomToolBarArea );
+    toolBar->addAction( m_startAction );
+    toolBar->addAction( m_clearAction );
+    toolBar->addAction( whatsThisAction );
+    toolBar->addWidget( hBox );
+
+    return toolBar;
+}
+
+void MainWindow::appendPoints( bool on )
+{
+    if ( on )
+    {
+        m_plot->append( m_timerCount->value(),
+            m_randomCount->value() );
+    }
+    else
+    {
+        m_plot->stop();
+    }
+}
+
+void MainWindow::showRunning( bool running )
+{
+    m_randomCount->setEnabled( !running );
+    m_timerCount->setEnabled( !running );
+    m_startAction->setChecked( running );
+    m_startAction->setText( running ? "Stop" : "Start" );
+}
+
+void MainWindow::showElapsed( int ms )
+{
+    QString text;
+    text.setNum( ms );
+    text += " ms";
+
+    statusBar()->showMessage( text );
+}
+
+void MainWindow::initWhatsThis()
+{
+    const char* text1 =
+        "Zooming is enabled until the selected area gets "
+        "too small for the significance on the axes.\n\n"
+        "You can zoom in using the left mouse button.\n"
+        "The middle mouse button is used to go back to the "
+        "previous zoomed area.\n"
+        "The right mouse button is used to unzoom completely.";
+
+    const char* text2 =
+        "Number of random points that will be generated.";
+
+    const char* text3 =
+        "Delay between the generation of two random points.";
+
+    const char* text4 =
+        "Start generation of random points.\n\n"
+        "The intention of this example is to show how to implement "
+        "growing curves. The points will be generated and displayed "
+        "one after the other.\n"
+        "To check the performance, a small delay and a large number "
+        "of points are useful. To watch the curve growing, a delay "
+        " > 300 ms and less points are better.\n"
+        "To inspect the curve, stacked zooming is implemented using the "
+        "mouse buttons on the plot.";
+
+    const char* text5 = "Remove all points.";
+
+    m_plot->setWhatsThis( text1 );
+    m_randomCount->setWhatsThis( text2 );
+    m_timerCount->setWhatsThis( text3 );
+    m_startAction->setWhatsThis( text4 );
+    m_clearAction->setWhatsThis( text5 );
+}
+
+#include "moc_MainWindow.cpp"