CODEWITHSUNDEEP
c++qtplotqcustomplot
wuhanmoon
wuhanmoon

Reputation: 23

How to plot multiple points using QCustomPlot QT5?

Here are some example points:

(1,1),(2,3),(3,1),(4,2),(1,5),(3,4)

I want to plot these points with a line in turn, I've added them into the vector x and y. Then, setData(x,y) was performed.
However, the QCustomPlot seems like can only plot points by the order of x axis. I noticed the points were sorted automatically by the setData(x,y).

How can I do to plot these points by the original order?

Upvotes: 2

Views: 1567

Answers (2)

A. Sarid
A. Sarid

Reputation: 3996

What you are looking for is using QCPCurve instead of Graph.

Define:

QCPCurve *newCurve;

And initiate it by doing:

this->newCurve = new QCPCurve(ui->customPlot->xAxis, ui->customPlot->yAxis);
ui->customPlot->addPlottable(this->newCurve);

Then you can use it the same way as you did with the Graph:

QVector<double> x, y;
//...
this->newCurve->setData(x, y);

See also this example: Parametric Curves Demo.

Upvotes: 0

wuhanmoon
wuhanmoon

Reputation: 23

Based on A. Sarid’ help, I found the usage of QCPCurve in the demos(11). The difference between QCPCurve and QCPGraph is that one x can correspond to different y with QCPCurve. So, just add the code:

QCPCurve *newCurve = new QCPCurve(ui->customPlot->xAxis, ui->customPlot->yAxis); newCurve->setData(x,y);

Thanks to A. Sarid again!

Upvotes: 0

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