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Commitf2a7682

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timhoffmQuLogic
andauthored
ENH: Scroll to zoom (#30405)
* ENH: Scroll to zoomImplements a minimal version of#20317, in particular https://github.com//pull/20317#issuecomment-2233156558:Co-authored-by: Elliott Sales de Andrade <quantum.analyst@gmail.com>
1 parent81febeb commitf2a7682

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@@ -0,0 +1,8 @@
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Zooming using mouse wheel
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~~~~~~~~~~~~~~~~~~~~~~~~~
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``Ctrl+MouseWheel`` can be used to zoom in the plot windows.
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The zoom focusses on the mouse pointer, and keeps the aspect ratio of the axes.
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Zooming is currently only supported on rectilinear Axes.

‎lib/matplotlib/backend_bases.py‎

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@@ -2574,6 +2574,51 @@ def button_press_handler(event, canvas=None, toolbar=None):
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toolbar.forward()
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defscroll_handler(event,canvas=None,toolbar=None):
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ax=event.inaxes
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ifaxisNone:
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return
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ifax.name!="rectilinear":
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# zooming is currently only supported on rectilinear axes
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return
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iftoolbarisNone:
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toolbar= (canvasorevent.canvas).toolbar
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iftoolbarisNone:
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# technically we do not need a toolbar, but until wheel zoom was
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# introduced, any interactive modification was only possible through
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# the toolbar tools. For now, we keep the restriction that a toolbar
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# is required for interactive navigation.
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return
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ifevent.key=="control":# zoom towards the mouse position
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toolbar.push_current()
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xmin,xmax=ax.get_xlim()
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ymin,ymax=ax.get_ylim()
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(xmin,ymin), (xmax,ymax)=ax.transScale.transform(
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[(xmin,ymin), (xmax,ymax)])
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# mouse position in scaled (e.g., log) data coordinates
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x,y=ax.transScale.transform((event.xdata,event.ydata))
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scale_factor=0.85**event.step
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new_xmin=x- (x-xmin)*scale_factor
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new_xmax=x+ (xmax-x)*scale_factor
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new_ymin=y- (y-ymin)*scale_factor
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new_ymax=y+ (ymax-y)*scale_factor
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inv_scale=ax.transScale.inverted()
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(new_xmin,new_ymin), (new_xmax,new_ymax)=inv_scale.transform(
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[(new_xmin,new_ymin), (new_xmax,new_ymax)])
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ax.set_xlim(new_xmin,new_xmax)
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ax.set_ylim(new_ymin,new_ymax)
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ax.figure.canvas.draw_idle()
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classNonGuiException(Exception):
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"""Raised when trying show a figure in a non-GUI backend."""
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pass
@@ -2653,11 +2698,14 @@ def __init__(self, canvas, num):
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self.key_press_handler_id=None
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self.button_press_handler_id=None
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self.scroll_handler_id=None
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ifrcParams['toolbar']!='toolmanager':
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self.key_press_handler_id=self.canvas.mpl_connect(
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'key_press_event',key_press_handler)
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self.button_press_handler_id=self.canvas.mpl_connect(
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'button_press_event',button_press_handler)
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self.scroll_handler_id=self.canvas.mpl_connect(
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'scroll_event',scroll_handler)
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self.toolmanager= (ToolManager(canvas.figure)
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ifmpl.rcParams['toolbar']=='toolmanager'

‎lib/matplotlib/backend_bases.pyi‎

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Original file line numberDiff line numberDiff line change
@@ -407,6 +407,11 @@ def button_press_handler(
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canvas:FigureCanvasBase|None= ...,
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toolbar:NavigationToolbar2|None= ...,
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)->None: ...
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defscroll_handler(
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event:MouseEvent,
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canvas:FigureCanvasBase|None= ...,
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toolbar:NavigationToolbar2|None= ...,
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)->None: ...
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classNonGuiException(Exception): ...
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@@ -415,6 +420,7 @@ class FigureManagerBase:
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num:int|str
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key_press_handler_id:int|None
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button_press_handler_id:int|None
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scroll_handler_id:int|None
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toolmanager:ToolManager|None
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toolbar:NavigationToolbar2|ToolContainerBase|None
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def__init__(self,canvas:FigureCanvasBase,num:int|str)->None: ...

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