How to return getXPos() values of pg.InfiniteLine?-CodePudding

I am trying to get all values of the object pg.InfiniteLine() using getXPos() method.

I tried the following (this code snippet is set inside of class MainWindow(QMainWindow)):

inf = pg.InfiniteLine(movable=True, angle=90, label='x={value:.3f}:{value:.3f}', 
                       labelOpts={'position':0.1, 'color': (200,200,100), 'fill': (200,200,200,50), 'movable': True})
inf.setPos([0,0])
self.graphWidget.addItem(inf)

Note: value in label='{value:.3f}:{value:.3f}' is after converting a list of strings t_string_list[:5] = ['0:0', '0:1', '0:2', '0:3', '0:4'] (of format H:M) to minutes stored in a variable t_time_value.

What I am trying to do is that label be set back to x=H:M displayed in the graph. To do that, I am trying to get all values of getXPos() for me to use Converting a float to hh:mm format.

I tried to do print(inf.getXPos()) but prints only 0. I also tried print(inf.getXPos(t_time_value)) I got TypeError: getXPos() takes 1 positional argument but 2 were given. I am not sure how to label the InfiniteLine with x=H:M where H:M should be values using label='{value:.3f}:{value:.3f}'.format(*divmod(pos / 60, 1)) argument of inf where I am facing difficulties to define pos.

This post is continuous to How to plot hour:min time in ISO 8601 time format?

Note: label='{value:.3f}:{value:.3f}' already gives correct positions whenever I move the line, but I couldn't do like this label='{value:.3f}:{value:.3f}'.format(value/60, 1) because value isn't defined.

CodePudding user response：

You cannot use evaluation in a basic format string, nor try to "get all values", since graphs use real numbers: you can have infinite points between 0 and 1.

The possible solution is to add the InfLineLabel manually, using a subclass that overrides the default behavior of valueChanged:

class InfTimeLabel(pg.InfLineLabel):
    def valueChanged(self):
        if not self.isVisible():
            return
        value = self.line.value()
        h, m = divmod(value, 60)
        text = '{}:{:06.3f}'.format(int(h), m)
        self.setText(text)
        self.updatePosition()

Then add it like this:

    infLine = pg.InfiniteLine(movable=True, angle=90)
    opts = {
        'position': 0.1,
        'color': (200, 200, 100),
        'fill': (200, 200, 200, 50),
        'movable': True
    }
    infLine.label = InfTimeLabel(infLine, **opts)

    self.graphWidget.addItem(infLine)