[讨论][求助]请问我用qwt来画图，怎样能够实现横坐标显示当前时间 [复制链接]

请问我用qwt来画图，怎样能够实现横坐标显示当前时间

图片:1428632297_457343.jpg

如图所示

parker:重新实现QwtScaleDraw的label
class TimeScaleDraw: public QwtScaleDraw
{
public:
    TimeScaleDraw( const QTime &base ):
....... (2015-05-15 16:44) 

非常感谢，抱着试一试的心态，完成了

图片:QQ截图20150516193740.jpg

图片:QQ截图20150511182134.jpg

重新实现QwtScaleDraw的label
class TimeScaleDraw: public QwtScaleDraw
{
public:
    TimeScaleDraw( const QTime &base ):
        baseTime( base )
    {
    }
    virtual QwtText label( double v ) const
    {
        QTime upTime = baseTime.addSecs( static_cast<int>( v ) );
        return upTime.toString();
    }
private:
    QTime baseTime;
};