Cannot find QwtPlotHistogram class

**gabe.ayers** · 8th February 2011, 14:17

I have been looking through all of the documentation for Qwt and cannot figure out where the histogram class is. At one point I found a post from 2008 that suggested the files were part of the 5.2 trunk but they seem to have been moved. Does anyone know how to create a histogram chart with Qwt 5.2.1?

Thanks for the help.

**FelixB** · 8th February 2011, 14:47

have a look into the examples. there you can find something like histogram.

In the current version in svn might be a "real" histogram class, but i'm not sure - still working with 5.2.

**gabe.ayers** · 8th February 2011, 15:56

Hmm... ok thank you. This seems like something that would/should be included as it seems less complicated to implement than other qwt included objects such as the spectrogram plot. Thanks for the help, I'll look through the examples.

If anyone has cut down histogram example that would be great.

Correction:

I just looked through the most recent RC files for QWT and it looks as though with V6.0 they have included a histogram class.

**d_stranz** · 8th February 2011, 23:51

Please note that if you are looking for something that draws Microsoft Chart-style bar charts, the new QwtPlotHistogram is not going to do what you want. It draws histograms, where the x, y values represent the x-axis position and y-axis height of the histogram stick. This is not the same as a bar chart, where the x-axis is a category axis, not a numeric axis.