Qt第三库QCustomPlot—绘图四

styleddemo.png

• 坐标轴：QCPAxis(xAxis,yAxis,xAxis1,yAxis2等四个成员变量)
  setTickStep(double step);//设置刻度间距
setTickVector(const QVector<double> &vec);//将坐标刻度设置为vec

customPlot->legend->setVisible(true);  //图例legend
QFont legendFont = font();  
legendFont.setPointSize(9); 
customPlot->legend->setFont(legendFont);  
customPlot->legend->setBrush(QBrush(QColor(255,255,255,230)));  //填充色
customPlot->axisRect()->insetLayout()->setInsetAlignment(0, Qt::AlignBottom|Qt::AlignRight);

customPlot->addGraph(customPlot->yAxis, customPlot->xAxis);  
customPlot->graph(0)->setPen(QPen(QColor(255, 100, 0))); //折线笔色
customPlot->graph(0)->setBrush(QBrush(QPixmap("./dali.png")));  //填充图片  
customPlot->graph(0)->setLineStyle(QCPGraph::lsLine);  
customPlot->graph(0)->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssDisc, 5)); //折线风格
customPlot->graph(0)->setName("Left maxwell function"); //折线名称

// prepare data:
QVector<double> x1(20), y1(20);
QVector<double> x2(100), y2(100);
QVector<double> x3(20), y3(20);
QVector<double> x4(20), y4(20);
for (int i=0; i<x1.size(); ++i)
{
  x1[i] = i/(double)(x1.size()-1)*10;
  y1[i] = qCos(x1[i]*0.8+qSin(x1[i]*0.16+1.0))*qSin(x1[i]*0.54)+1.4;
}
for (int i=0; i<x2.size(); ++i)
{
  x2[i] = i/(double)(x2.size()-1)*10;
  y2[i] = qCos(x2[i]*0.85+qSin(x2[i]*0.165+1.1))*qSin(x2[i]*0.50)+1.7;
}
for (int i=0; i<x3.size(); ++i)
{
  x3[i] = i/(double)(x3.size()-1)*10;
  y3[i] = 0.05+3*(0.5+qCos(x3[i]*x3[i]*0.2+2)*0.5)/(double)(x3[i]+0.7)+qrand()/(double)RAND_MAX*0.01;
}
for (int i=0; i<x4.size(); ++i)
{
  x4[i] = x3[i];
  y4[i] = (0.5-y3[i])+((x4[i]-2)*(x4[i]-2)*0.02);
}
 
// create and configure plottables:
QCPGraph *graph1 = customPlot->addGraph();
graph1->setData(x1, y1);
graph1->setScatterStyle(QCPScatterStyle(QCPScatterStyle::ssCircle, QPen(Qt::black, 1.5), QBrush(Qt::white), 9));
graph1->setPen(QPen(QColor(120, 120, 120), 2));
 
QCPGraph *graph2 = customPlot->addGraph();
graph2->setData(x2, y2);
graph2->setPen(Qt::NoPen);
graph2->setBrush(QColor(200, 200, 200, 20));
graph2->setChannelFillGraph(graph1);
 
QCPBars *bars1 = new QCPBars(customPlot->xAxis, customPlot->yAxis);
bars1->setWidth(9/(double)x3.size());
bars1->setData(x3, y3);
bars1->setPen(Qt::NoPen);
bars1->setBrush(QColor(10, 140, 70, 160));
 
QCPBars *bars2 = new QCPBars(customPlot->xAxis, customPlot->yAxis);
bars2->setWidth(9/(double)x4.size());
bars2->setData(x4, y4);
bars2->setPen(Qt::NoPen);
bars2->setBrush(QColor(10, 100, 50, 70));
bars2->moveAbove(bars1);
 
// move bars above graphs and grid below bars:
customPlot->addLayer("abovemain", customPlot->layer("main"), QCustomPlot::limAbove);
customPlot->addLayer("belowmain", customPlot->layer("main"), QCustomPlot::limBelow);
graph1->setLayer("abovemain");
customPlot->xAxis->grid()->setLayer("belowmain");
customPlot->yAxis->grid()->setLayer("belowmain");
 
// set some pens, brushes and backgrounds:
customPlot->xAxis->setBasePen(QPen(Qt::white, 1));
customPlot->yAxis->setBasePen(QPen(Qt::white, 1));
customPlot->xAxis->setTickPen(QPen(Qt::white, 1));
customPlot->yAxis->setTickPen(QPen(Qt::white, 1));
customPlot->xAxis->setSubTickPen(QPen(Qt::white, 1));
customPlot->yAxis->setSubTickPen(QPen(Qt::white, 1));
customPlot->xAxis->setTickLabelColor(Qt::white);
customPlot->yAxis->setTickLabelColor(Qt::white);
customPlot->xAxis->grid()->setPen(QPen(QColor(140, 140, 140), 1, Qt::DotLine));
customPlot->yAxis->grid()->setPen(QPen(QColor(140, 140, 140), 1, Qt::DotLine));
customPlot->xAxis->grid()->setSubGridPen(QPen(QColor(80, 80, 80), 1, Qt::DotLine));
customPlot->yAxis->grid()->setSubGridPen(QPen(QColor(80, 80, 80), 1, Qt::DotLine));
customPlot->xAxis->grid()->setSubGridVisible(true);
customPlot->yAxis->grid()->setSubGridVisible(true);
customPlot->xAxis->grid()->setZeroLinePen(Qt::NoPen);
customPlot->yAxis->grid()->setZeroLinePen(Qt::NoPen);
customPlot->xAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);
customPlot->yAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);
QLinearGradient plotGradient;
plotGradient.setStart(0, 0);
plotGradient.setFinalStop(0, 350);
plotGradient.setColorAt(0, QColor(80, 80, 80));
plotGradient.setColorAt(1, QColor(50, 50, 50));
customPlot->setBackground(plotGradient);
QLinearGradient axisRectGradient;
axisRectGradient.setStart(0, 0);
axisRectGradient.setFinalStop(0, 350);
axisRectGradient.setColorAt(0, QColor(80, 80, 80));
axisRectGradient.setColorAt(1, QColor(30, 30, 30));
customPlot->axisRect()->setBackground(axisRectGradient);
 
customPlot->rescaleAxes();
customPlot->yAxis->setRange(0, 2);