QT

//绘制准备工作,启用反锯齿,平移坐标轴中心,等比例缩放
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);

    if (showRect) {
        //绘制矩形区域
        painter.setPen(Qt::NoPen);
        painter.setBrush(bgColor);
        painter.drawRoundedRect(this->rect(), 5, 5);

        //绘制文字
        if (!text.isEmpty()) {
            QFont font;
            font.setPixelSize(side - 20);
            painter.setFont(font);
            painter.setPen(textColor);
            painter.drawText(this->rect(), Qt::AlignCenter, text);
        }
    } else {
        painter.translate(width / 2, height / 2);
        painter.scale(side / 200.0, side / 200.0);

        //绘制外边框
        drawBorderOut(&painter);
        //绘制内边框
        drawBorderIn(&painter);
        //绘制内部指示颜色
        drawBg(&painter);
        //绘制居中文字
        drawText(&painter);
        //绘制遮罩层
        drawOverlay(&painter);