QCustomPlot绘制柱状图，折线图-编程知识

QCustomPlot绘制柱状图，折线图

柱状图绘制

// 创建QCustomPlot对象QCustomPlot customPlot;// 创建柱状图数据QVector<double> xData = { 1, 2, 3, 4, 5 };QVector<double> yData = { 3, 6, 2, 7, 4 };// 创建柱状图数据容器QCPBars *bars = new QCPBars(customPlot.xAxis, customPlot.yAxis);bars->setData(xData, yData);//为柱状图设置一个文字类型的key轴，ticks决定了轴的范围，而labels决定了轴的刻度文字的显示QVector<double> ticks;QVector<QString> labels;ticks << 1 << 2 << 3 << 4 << 5 ;labels << "2001" << "2002" << "2003" << "2004" << "2005" ;QSharedPointer<QCPAxisTickerText> textTicker(new QCPAxisTickerText);textTicker->addTicks(ticks, labels);customPlot.xAxis->setTicker(textTicker); // 设置为文字轴customPlot.xAxis->setTickLabelRotation(60);     // 轴刻度文字旋转60度customPlot.xAxis->setSubTicks(false);           // 不显示子刻度customPlot.xAxis->setTickLength(0, 4);          // 轴内外刻度的长度分别是0,4,也就是轴内的刻度线不显示customPlot.xAxis->setRange(0, 6);               // 设置范围customPlot.xAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);bars->setWidth(0.4);// 设置柱状图样式bars->setBrush(QColor(0, 168, 140));  // 设置柱状图颜色// 设置坐标轴范围和标签customPlot.xAxis->setLabel("X");customPlot.yAxis->setLabel("Y");customPlot.xAxis->setRange(0.5, 5.5);  // X轴范围从0.5到5.5customPlot.yAxis->setRange(0, 8);  // Y轴范围从0到8// 显示图表窗口customPlot.show();

如图所示
代码结果

多组柱状图

// 创建QCustomPlot对象件QCustomPlot* customPlot = new QCustomPlot();customPlot->resize(400, 400);// 创建柱状图数据QVector<double> xData = { 1, 2, 3, 4, 5 };QVector<double> yData = { 10, 20, 30, 40, 50 };// 创建柱状图QCPBars* bars1= new QCPBars(customPlot->xAxis, customPlot->yAxis);QCPBars* bars2 = new QCPBars(customPlot->xAxis, customPlot->yAxis);QCPBarsGroup* group = new QCPBarsGroup(customPlot);bars1->setWidth(bars1->width() / 2);bars2->setWidth(bars2->width() / 2);group->append(bars1);group->append(bars2);bars1->setData(xData, yData);bars2->setData(xData, yData);// 设置柱状图样式QPen pen;pen.setWidthF(1);bars1->setPen(pen);bars1->setBrush(QColor(100, 149, 237));bars2->setPen(pen);bars2->setBrush(QColor(100, 149, 237));// 设置坐标轴范围customPlot->xAxis->setRange(0.5, 5.5);customPlot->yAxis->setRange(0, 60);// 显示图表customPlot->replot();customPlot->show();

如图所示：
代码运行图

折线图绘制

	// 创建QCustomPlot对象QCustomPlot customPlot;// 创建折线图数据QVector<double> xData = { 1, 2, 3, 4, 5 };QVector<double> yData = { 3, 6, 2, 7, 4 };// 创建折线图数据容器customPlot.addGraph();customPlot.graph(0)->setData(xData, yData);// 设置折线图样式customPlot.graph(0)->setLineStyle(QCPGraph::lsLine);       // 设置线条风格为实线customPlot.graph(0)->setScatterStyle(QCPScatterStyle::ssCircle);  // 设置散点风格为圆形// 设置坐标轴范围和标签customPlot.xAxis->setLabel("X");customPlot.yAxis->setLabel("Y");customPlot.xAxis->setRange(0.5, 5.5);  // X轴范围从0.5到5.5customPlot.yAxis->setRange(0, 8);  // Y轴范围从0到8// 显示图表窗口customPlot.show();