彻底改版2.0

third/qwtdemo/examples/cpuplot/cpupiemarker.cpp

@@ -0,0 +1,54 @@
+#include <qpainter.h>
+#include <qwt_scale_map.h>
+#include <qwt_plot_curve.h>
+#include "cpuplot.h"
+#include "cpupiemarker.h"
+
+CpuPieMarker::CpuPieMarker()
+{
+    setZ( 1000 );
+    setRenderHint( QwtPlotItem::RenderAntialiased, true );
+}
+
+int CpuPieMarker::rtti() const
+{
+    return QwtPlotItem::Rtti_PlotUserItem;
+}
+
+void CpuPieMarker::draw( QPainter *painter,
+    const QwtScaleMap &, const QwtScaleMap &,
+    const QRectF &rect ) const
+{
+    const CpuPlot *cpuPlot = static_cast<CpuPlot *> ( plot() );
+
+    const QwtScaleMap yMap = cpuPlot->canvasMap( QwtPlot::yLeft );
+
+    const int margin = 5;
+
+    QRectF pieRect;
+    pieRect.setX( rect.x() + margin );
+    pieRect.setY( rect.y() + margin );
+    pieRect.setHeight( yMap.transform( 80.0 ) );
+    pieRect.setWidth( pieRect.height() );
+
+    const int dataType[] = { CpuPlot::User, CpuPlot::System, CpuPlot::Idle };
+
+    int angle = static_cast<int>( 5760 * 0.75 );
+    for ( unsigned int i = 0;
+        i < sizeof( dataType ) / sizeof( dataType[0] ); i++ )
+    {
+        const QwtPlotCurve *curve = cpuPlot->cpuCurve( dataType[i] );
+        if ( curve->dataSize() > 0 )
+        {
+            const int value = static_cast<int>( 5760 * curve->sample( 0 ).y() / 100.0 );
+
+            painter->save();
+            painter->setBrush( QBrush( curve->brush().color(), Qt::SolidPattern ) );
+            if ( value != 0 )
+                painter->drawPie( pieRect, -angle, -value );
+            painter->restore();
+
+            angle += value;
+        }
+    }
+}