New BasePlot.SIG_AXIS_PARAMETERS_CHANGED signal emitted when axis parameters change

Author: PierreRaybaut

CHANGELOG.md

@@ -23,6 +23,8 @@ In this release, test coverage is 79%.
   * Or after: `plot_widget.manager.get_tool(ImageStatsTool).set_stats_func(...)`
   * The `stats_func` parameter is a function that takes the image item and selected
     rectangle coordinates, and returns a string with the statistics to display
+* New `SIG_AXIS_PARAMETERS_CHANGED` signal emitted by `BasePlot` when the axes parameters
+  are changed (e.g. when the axes are inverted, or the scale is changed)
 
 🧹 API cleanup:
 

plotpy/plot/base.py

@@ -236,6 +236,13 @@ class BasePlot(qwt.QwtPlot):
     #:     item: the item
     SIG_ITEM_PARAMETERS_CHANGED = QC.Signal(object)
 
+    #: Signal emitted by plot when axis parameters have changed (through the axis
+    #: parameters dialog)
+    #:
+    #: Args:
+    #:     axis_id: the axis id (0: left, 1: right, 2: bottom, 3: top)
+    SIG_AXIS_PARAMETERS_CHANGED = QC.Signal(int)
+
     #: Signal emitted by plot when selected item has changed
     #:
     #: Args:

plotpy/styles/axes.py

@@ -73,6 +73,7 @@ def update_axis(self, plot: BasePlot, axis_id: int) -> None:
         plot.set_axis_scale(axis_id, self.scale, autoscale=False)
         plot.setAxisScale(axis_id, self.vmin, self.vmax)
         plot.disable_unused_axes()
+        plot.SIG_AXIS_PARAMETERS_CHANGED.emit(axis_id)
 
 
 class AxisItemWidget(DataSetWidget):

plotpy/tools/image.py

@@ -34,6 +34,7 @@
     get_items_in_rectangle,
 )
 from plotpy.mathutils.colormap import ALL_COLORMAPS, build_icon_from_cmap_name, get_cmap
+from plotpy.plot import BasePlot
 from plotpy.tools.base import (
     CommandTool,
     DefaultToolbarID,
@@ -57,7 +58,6 @@
     from plotpy.items.image.base import BaseImageItem
     from plotpy.items.shape.base import AbstractShape
     from plotpy.items.shape.polygon import PolygonShape
-    from plotpy.plot import BasePlot
     from plotpy.plot.manager import PlotManager
     from plotpy.plot.plotwidget import PlotOptions
     from plotpy.styles.image import BaseImageParam
@@ -370,6 +370,7 @@ def activate_command(self, plot: BasePlot, checked: bool) -> None:
         """
         plot.set_axis_direction("left", checked)
         plot.replot()
+        plot.SIG_AXIS_PARAMETERS_CHANGED.emit(BasePlot.Y_LEFT)
 
     def update_status(self, plot: BasePlot) -> None:
         """Update tool status if the plot type is not PlotType.CURVE.