Hi JJ,
Try changing the initialisation parameters of the label to
h_line.label = pg.InfLineLabel(h_line, text=f"y = {h_line.value():.2f}",
position=0.00, anchors=[(-0.1, 0), (-0.1, 1)], color='r', fill=(255, 255,
255, 255))
The "position" parameter is relative so needs to be zero so it doesn't
expand, but the "anchors" parameter is what gives the fixed offset so the
label doesn't get clipped by the y-axis.
Patrick
On Monday 28 October 2024 at 8:38:04 pm UTC+10:30 JJ wrote:
> In the code below, I can't get the label to hug the y axis when the graph
> is resized. If the graph is resized smaller/larger, the label is truncated
> or additional space appears between the y axis and the label. Any ideas on
> how to position the label adjacent to the y axis for all graph sizes?
>
> import sys
> import numpy as np
> from PyQt5.QtWidgets import QApplication
> import pyqtgraph as pg
>
> app = QApplication(sys.argv)
> win = pg.GraphicsLayoutWidget(show=True, title="y = exp(x) with
> Movable Line")
> plot = win.addPlot(title="y = exp(x) with Movable Line")
> x = np.linspace(-2, 2, 1000)
> y = np.exp(x)
> plot.plot(x, y, pen='b')
>
> # Create a movable infinite horizontal line with a label that updates
> based on y-position
> h_line = pg.InfiniteLine(pos=1.0, angle=0, movable=True)
> plot.addItem(h_line)
> h_line.label = pg.InfLineLabel(h_line, text=f"y = {h_line.value():.2f}
> ", position=0.05, color='r', fill=(255, 255, 255, 255))
>
> def update_label():
> h_line.label.setText(f"y = {h_line.value():.2f}")
>
> h_line.sigPositionChanged.connect(update_label)
> sys.exit(app.exec_())
>
>
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