RE: QwtPlotSpectrogram Questions

[Hill, S. <Sha...@ds...>]

Thanks for the info. For item 1 below, I suppose we don't need to go to =
the trouble of breaking the line to insert the contour text label. =
Placing it next to a line would suffice. Placing consecutive labels in a =
suitable location on the plot would be the tricky part.


Have Fun !!
=20
Shane Hill

-----Original Message-----
From: qwt...@li... =
[mailto:qwt...@li...] On Behalf Of Uwe =
Rathmann
Sent: Monday, 31 July 2006 8:40 AM
To: List for both Qwt users and developers
Subject: Re: QwtPlotSpectrogram Questions

On Friday 28 July 2006 06:39, Hill, Shane wrote:

> Does anyone have any information on where this class is heading?=20

It=B4s a first implementation, open to be improved to whatever is of =
general interest. If you want to improve the contouring stuff, please =
try it.

> 1. Text labels for contours that appear as part of the contour. Very=20
> much like contour lines on a map that tell you the height of that=20
> contour. The contour line is usually broken and a label inserted.=20
> Labels would only appear on major contours, (see below).

Please read http://astronomy.swin.edu.au/~pbourke/projection/conrec to =
understand, why you need an fast algo first, that connects the =
unconnected small lines to what you mean by contour lines. This would be =
useful for other things like antialiasing the contour lines as well.

> 2. Major and minor contour levels so that line style properties could=20
> be set. I suppose this could be part of the defined contour levels=20
> that a line style for each contour could be set, i.e. solid versus=20
> dotted lines for example.

Of course an API for setting an individual pen for each contour level =
should be added.=20

Uwe

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