Tag: plot

在C中打印毕达哥拉斯三重奏的代表

我正在尝试创建一个程序，用于打印C中发现的毕达哥拉斯三元组的映射数据。到目前为止，我编写了程序以便能够找到三元组。 #include #include int main (int argc, char * argv[]) { int a, b, c; int a2, b2, c2; int limit = 60; for (a = 1; a <= limit; a++) { a2 = a * a; for (b = 1; b <= limit; b++) { b2 = b * b; for (c = 0; […]

‘QwtLog10ScaleEngine’之前的预期类型说明符？

版本：qwt 6.0.1我试图为Spectrum开发对数缩放。 我用简单的线来启用缩放plotspectrum-> setAxisScaleEngine（QwtPlot :: yLeft，new QwtLog10ScaleEngine）; 问题：未绘制数据，因此绘图为空，编译器返回以下错误：“QwtLog10ScaleEngine之前的预期类型说明符”任何帮助都不胜感激这里是我的代码： 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); […]