Qt开源-直方图

话不多说，先上效果图：

QPainter绘制部分:

QPainter painter(this);

    painter.translate(50, this->height() - 50);
    painter.rotate(270);

    qint16 ny = 0;
    for (auto result : m_listAnswerResult) {
        // histogram
        if (result.correct) {
            painter.setPen(QColor(35, 199, 108));
            painter.setBrush(QColor(35, 199, 108));
        } else {
            painter.setPen(QColor(239, 76, 79));
            painter.setBrush(QColor(239, 76, 79));
        }

        ny += kHorizontalSpacing + kHistogramWidth;
        if (result.count > 0) {
            painter.drawRect(40, ny, result.count * getPerHeightSize(), kHistogramWidth);
        }

        // choice
        painter.save();
        QFont choice_font("Microsoft YaHei", 20, 500);
        QFontMetrics fm_choice(choice_font);

        // choice text width(for align center)
        int choice_width  = fm_choice.boundingRect(result.choice).width();
        int choice_height = fm_choice.boundingRect(result.choice).height();
        painter.translate(0, ny + (kHistogramWidth - choice_width) / 2);
        painter.rotate(90);

        painter.setFont(choice_font);
        painter.setPen(QColor(51, 51, 51));
        painter.drawText(0, 0, result.choice);
        painter.restore();

        // count
        painter.save();
        QFont count_font("Microsoft YaHei", 14, 400);
        QFontMetrics fm_count(count_font);

        // count text width(for align center)
        int text_width = fm_count.boundingRect(QString::number(result.count)).width();
        painter.translate(choice_height + result.count * getPerHeightSize() + kCountSpacing, ny + (kHistogramWidth - text_width) / 2);
        painter.rotate(90);

        painter.setFont(count_font);
        painter.setPen(QColor(102,102,102));
        painter.drawText(0, 0, QString::number(result.count));
        painter.restore();
    }

开源代码：

转载请注明出处，谢谢