版本:qwt 6.0.1
我尝试开发频谱的对数缩放。
我使用简单的线条来启用缩放plotspectrum->setAxisScaleEngine(QwtPlot::yLeft, new QwtLog10ScaleEngine);
问题:数据未绘制,因此绘图为空,并且编译器返回以下错误:“‘QwtLog10ScaleEngine’之前预期类型说明符”
任何帮助将不胜感激
这是我的代码:
class SpectrumPlot : public QWidget
{
Q_OBJECT
public:
PlotSpektrum();
private:
QHBoxLayout* m_SpectrumLayout;
QwtPlot* m_SpectrumPlot;
QwtPlotCurve* m_SpectrumCurve;
QwtPlotMarker* m_Marker;
};
SpectrumPlot::SpectrumPlot()
{
m_SpectrumLayout = new QHBoxLayout();
m_SpectrumPlot = new QwtPlot();
m_SpectrumCurve = new QwtPlotCurve();
QwPlotGrid* pGrid = new QwtPlotGrid();
QPen GridPen;
GridPen.setColor(Qt::green);
GridPen.setWidthF(0.7);
GridPen.setStyle(Qt::DashLine);
QPen SpectrumPen;
SpectrumPen.setColor(Qt::white);
pGrid->setRenderHint(QwtPlotItem::RenderAntialiased);
pGrid->setPen(GridPen);
pGrid->enableXMin(true);
pGrid->attach(m_SpectrumPlot);
m_SpectrumPlot->setTitle("Spectrum");
m_SpectrumPlot->setCanvasBackground(QBrush(Qt::black));
m_SpectrumPlot->setAutoDelete(true);
m_SpectrumPlot->setAxisTitle(QwtPlot::xBottom, "Frequency Hz");
m_SpectrumPlot->setAxisScale(QwtPlot::xBottom, 100, nNyquistFrequency);
m_SpectrumPlot->setAxisScale(QwtPlot::yLeft, 0, 150);
m_SpectrumPlot->setAxisScaleEngine(QwtPlot::xBottom, new QwtLog10ScaleEngine());
m_SpectrumLayout->addWidget(m_SpectrumPlot);
this->setLayout(m_SpectrumLayout);
}
我认为你应该使用:
new QwtLogScaleEngine(10)
该手册用于QwtScaleEngine http://qwt.sourceforge.net/class_qwt_scale_engine.html不显示任何名为的类QwtLog10ScaleEngine
.
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