All I want is for the endpoints of the scale to match the outliers of the input sources. So if I have inputs 0,0 and 2000,1000, then the x axis should go from 0 to 2000 and the y axis to go from 0 to 1000.

So I have the code:

Qt Code: 
  1. qwtPlot->axisScaleEngine(QwtPlot::xBottom)->setAttribute(QwtScaleEngine::Floating,true);
  2. qwtPlot->axisScaleEngine(QwtPlot::yLeft)->setAttribute(QwtScaleEngine::Floating,true);
  3. qwtPlot->setAxisAutoScale(QwtPlot::xBottom);
  4. qwtPlot->setAxisAutoScale(QwtPlot::yLeft);
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The x axis is OK, and matches the inputs. But the Y axis goes from 0 to 30,000???

Thanks for the help.