Need basic help

[Ossi]

Hi all.

I am trying to find the best way to show my data using QWT. I have a QMap wich maps a QDate to a QVector containing data (double).

I want to show the date on the X axis and the data on the Y axis.

First question: Can I put dates on the x-axis? i.e: may-25-1980, may-26-1980 (QString format) or can I only have double values on the x-axis?

Second question: Is there a way such that qwt does not copy the data, when plotting to a curve? I already have the data in my own containers. If I can, I dont want to copy my data so I have one copy and qwt has one copy... Is there a way such as there is only one data container, i.e qwt does not copy the data, but uses pointers to my containers?

/Ossi

[Uwe]

First question: Can I put dates on the x-axis? i.e: may-25-1980, may-26-1980 (QString format) or can I only have double values on the x-axis?

Overload QwtScaleDraw::label().

Second question: Is there a way such that qwt does not copy the data, when plotting to a curve? I already have the data in my own containers

The curve gets its values using an abstract interface called QwtData. You are free to implement whatever you want behind this interface.

Uwe

[Ossi]

Thanks Uwe, I got it to work !