垂直QLabel或等效？

问题描述

我想要一个绘图的轴标签，当然y轴标签应该垂直。我确定 QwtPlot 这样做，但我想保持轻松，所以我只是使用一个简单的 QWidget + QPainter 。我没有看到在文档中更改 QLabel 方向的任何方式。一些解决方案在中给出，但我想要东西似乎不像这样的黑客。我现在使用 Qt 4.8 ，除了 QPainter :: drawText（） ？

I want axis labels for a plot I'm making, and naturally the y-axis label should be oriented vertically. I'm pretty sure QwtPlot does this, but I'm trying to keep things light so I'm just using a simple QWidget + QPainter for now. I didn't see any way to change QLabel orientation in the documentation. Some solutions are given in this 2002 thread but I'd like something that doesn't seem like such a hack. I'm using Qt 4.8 now, is there really no way to do this aside from QPainter::drawText()?

推荐答案

确实我放弃了找到任何简单的方法来实现这一点，并查看Uwe Rathmann的Qwt代码确实他在其 QwtPainter :: drawText 包装器函数中的QPainter :: drawText（），以及 QTransform 实现旋转，在 QwtScaleDraw :: labelTransformation 中。所以我只是把这些在一起如下：

So indeed I gave up on finding any simple way to achieve this, and looking over Uwe Rathmann's Qwt code indeed he uses QPainter::drawText() in his QwtPainter::drawText wrapper function, and a QTransform to achieve the rotation, in QwtScaleDraw::labelTransformation. So I've just put these together as follows:

void LabelWidget::paintEvent(QPaintEvent*)
{
    QPainter painter(this);
    painter.setPen(Qt::black);
    //... Need an appropriate call to painter.translate() for this to work properly
    painter.rotate(90);
    painter.drawText(QPoint(0,0), _text);
}

不需要QPixmap，事实证明。

Didn't need a QPixmap, it turns out.

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