How to visualize data with Qt QwtPlot3D

Question

I have a problem using Qt+QwtPlot3D library.

I need to visualize the data. The data is a simple matrix 5x5. Values are float numbers.

For example like this:

0  0    0    0     0
0  4,5  0,5  1,5  -2
0  0,5  2    0,5   0
0  0,5  0,5  0,45  0
0  0    0    0     0

I try out all examples. I understand to use library I should create class with reloaded operator with inheritance from class Qwt3D::Fucntion.

double operator (double x, double y);

This way is not for me becase I have no z = f(x,y), I have only coordinates.

---

In the official manual I found this function:

bool loadFromData(double **data, unsigned int columns, unsigned int rows, 
                  double minx, double maxx, double miny, double maxy)

But there is no example or sample how to draw the plot using this function.

Can you help me to find the way to draw my matrix in Qt?

Answer 1

If the delays are not critical for you, just use the QProcess to execute gnuplot.exe. Save plot to *.png. And then open image in your program

Answer 2

Forget about this library. It's too old, though it was updated recently. Use MathGL.