QCustomPlot QCPBars横向柱状图示例

#include "qcustomplot.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QCustomPlot customPlot;
    customPlot.resize(700, 500);
    customPlot.show();

    QCPAxis* keyAxis = customPlot.yAxis;
    QCPAxis* valueAxis = customPlot.xAxis;

    QCPBars* fossil = new QCPBars(keyAxis, valueAxis);  // 使用xAxis作为柱状图的key轴，yAxis作为value轴

    fossil->setAntialiased(false); // 为了更好的边框效果，关闭抗齿锯
    fossil->setName("Fossil fuels"); // 设置柱状图的名字，可在图例中显示
    fossil->setPen(QPen(QColor(0, 168, 140).lighter(130))); // 设置柱状图的边框颜色
    fossil->setBrush(QColor(0, 168, 140));  // 设置柱状图的画刷颜色

    // 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 << 6 << 7;
    labels << "USA" << "Japan" << "Germany" << "France" << "UK" << "Italy" << "Canada";
    QSharedPointer<QCPAxisTickerText> textTicker(new QCPAxisTickerText);
    textTicker->addTicks(ticks, labels);
    keyAxis->setTicker(textTicker);        // 设置为文字轴

    keyAxis->setTickLabelRotation(60);     // 轴刻度文字旋转60度
    keyAxis->setSubTicks(false);           // 不显示子刻度
    keyAxis->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
    keyAxis->setRange(0, 8);               // 设置范围
    keyAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);

    valueAxis->setRange(0, 12.1);
    valueAxis->setPadding(35);
    valueAxis->setLabel("Power Consumption in\nKilowatts per Capita (2007)");
    valueAxis->setUpperEnding(QCPLineEnding::esSpikeArrow);
    QVector<double> fossilData;
    fossilData << 0.86 * 10.5 << 0.83 * 5.5 << 0.84 * 5.5 << 0.52 * 5.8 << 0.89 * 5.2 << 0.90 * 4.2 << 0.67 * 11.2;
    fossil->setData(ticks, fossilData);

    return a.exec();
}
效果图如下：