新增qwt源码版本

2019-11-07 10:56:33 +08:00
parent d9b38d7ecd
commit 4746999d0e
377 changed files with 81225 additions and 1 deletions
--- a/qwtdemo/examples/realtime/randomplot.cpp
+++ b/qwtdemo/examples/realtime/randomplot.cpp
@@ -0,0 +1,141 @@
+#include <qglobal.h>
+#include <qtimer.h>
+#include <qwt_plot_grid.h>
+#include <qwt_plot_canvas.h>
+#include <qwt_plot_layout.h>
+#include <qwt_scale_widget.h>
+#include <qwt_scale_draw.h>
+#include "scrollzoomer.h"
+#include "randomplot.h"
+
+const unsigned int c_rangeMax = 1000;
+
+class Zoomer: public ScrollZoomer
+{
+public:
+    Zoomer( QWidget *canvas ):
+        ScrollZoomer( canvas )
+    {
+#if 0
+        setRubberBandPen( QPen( Qt::red, 2, Qt::DotLine ) );
+#else
+        setRubberBandPen( QPen( Qt::red ) );
+#endif
+    }
+
+    virtual QwtText trackerTextF( const QPointF &pos ) const
+    {
+        QColor bg( Qt::white );
+
+        QwtText text = QwtPlotZoomer::trackerTextF( pos );
+        text.setBackgroundBrush( QBrush( bg ) );
+        return text;
+    }
+
+    virtual void rescale()
+    {
+        QwtScaleWidget *scaleWidget = plot()->axisWidget( yAxis() );
+        QwtScaleDraw *sd = scaleWidget->scaleDraw();
+
+        double minExtent = 0.0;
+        if ( zoomRectIndex() > 0 )
+        {
+            // When scrolling in vertical direction
+            // the plot is jumping in horizontal direction
+            // because of the different widths of the labels
+            // So we better use a fixed extent.
+
+            minExtent = sd->spacing() + sd->maxTickLength() + 1;
+            minExtent += sd->labelSize(
+                scaleWidget->font(), c_rangeMax ).width();
+        }
+
+        sd->setMinimumExtent( minExtent );
+
+        ScrollZoomer::rescale();
+    }
+};
+
+RandomPlot::RandomPlot( QWidget *parent ):
+    IncrementalPlot( parent ),
+    d_timer( 0 ),
+    d_timerCount( 0 )
+{
+    setFrameStyle( QFrame::NoFrame );
+    setLineWidth( 0 );
+
+    plotLayout()->setAlignCanvasToScales( true );
+
+    QwtPlotGrid *grid = new QwtPlotGrid;
+    grid->setMajorPen( Qt::gray, 0, Qt::DotLine );
+    grid->attach( this );
+
+    setCanvasBackground( QColor( 29, 100, 141 ) ); // nice blue
+
+    setAxisScale( xBottom, 0, c_rangeMax );
+    setAxisScale( yLeft, 0, c_rangeMax );
+
+    replot();
+
+    // enable zooming
+
+    ( void ) new Zoomer( canvas() );
+}
+
+QSize RandomPlot::sizeHint() const
+{
+    return QSize( 540, 400 );
+}
+
+void RandomPlot::appendPoint()
+{
+    double x = qrand() % c_rangeMax;
+    x += ( qrand() % 100 ) / 100;
+
+    double y = qrand() % c_rangeMax;
+    y += ( qrand() % 100 ) / 100;
+
+    IncrementalPlot::appendPoint( QPointF( x, y ) );
+
+    if ( --d_timerCount <= 0 )
+        stop();
+}
+
+void RandomPlot::append( int timeout, int count )
+{
+    if ( !d_timer )
+    {
+        d_timer = new QTimer( this );
+        connect( d_timer, SIGNAL( timeout() ), SLOT( appendPoint() ) );
+    }
+
+    d_timerCount = count;
+
+    Q_EMIT running( true );
+    d_timeStamp.start();
+
+    QwtPlotCanvas *plotCanvas = qobject_cast<QwtPlotCanvas *>( canvas() );
+    plotCanvas->setPaintAttribute( QwtPlotCanvas::BackingStore, false );
+
+    d_timer->start( timeout );
+}
+
+void RandomPlot::stop()
+{
+    Q_EMIT elapsed( d_timeStamp.elapsed() );
+
+    if ( d_timer )
+    {
+        d_timer->stop();
+        Q_EMIT running( false );
+    }
+
+    QwtPlotCanvas *plotCanvas = qobject_cast<QwtPlotCanvas *>( canvas() );
+    plotCanvas->setPaintAttribute( QwtPlotCanvas::BackingStore, true );
+}
+
+void RandomPlot::clear()
+{
+    clearPoints();
+    replot();
+}