How to plot QAbstractItemModel using QCustomPlot

Question

Is there a direct way to pass QAbstractItemModel to QCustomPlot? Currently I am defining two QVector<double> for Xval and yVal. When I have to plot, I update these two vectors from QAbstractItemModel to launch the plot function.

Is there any way that QCustomPlot can accept QAbstractItemModel?

Nejat · Accepted Answer · 2015-05-15 04:31:04Z

1

AFAIK there is not a direct support for QAbstractItemModel in QCustomPlot. I am not sure how you expect QCustomPlot to draw contents of a QAbstractItemModel. As you know the model could be a simple model or a complex one or even hierarchical. That's two much for a simple 2D plot like QCustomPlot. But there seems to be a way to assign data of a subclass of QAbstractItemModel to QCustomPlot and that's using QCPDataMap.

You should populate the data of your model in QCPDataMap and assign it to plot. That's something like :

QCPDataMap *data = new QCPDataMap();

for(int i=0; i<count; i++)
    data->insertMulti(data->constEnd(), x[i], QCPData(x[i], y[i]));

plot->graph()->setData(data);

You can generate QCPDataMap in your model using x and y values and assign it's pointer to plot.

answered May 15, 2015 at 4:31

Nejat

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1 Comment

Kuba hasn't forgotten Monica Over a year ago

QCustomPlot certainly could support table models. That it doesn't is not out of necessity, but out of lack of time/willpower/manpower. It'd be an easy thing to do.

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