From a30c155b8da3c59ebb1406725253b2a790de9529 Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Fri, 28 May 2021 00:11:25 +0200
Subject: [PATCH] Support panning and zooming using mouse scroll wheel
---
lib/matplotlib/backend_bases.py | 39 +++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
index 8574398cfd6e..0ade438d2641 100644
--- a/lib/matplotlib/backend_bases.py
+++ b/lib/matplotlib/backend_bases.py
@@ -2688,6 +2688,42 @@ def button_press_handler(event, canvas=None, toolbar=None):
toolbar.forward()
+def scroll_handler(event, canvas=None, toolbar=None):
+ ax = event.inaxes
+ if ax is None:
+ return
+
+ if toolbar is None:
+ if canvas is None:
+ canvas = event.canvas
+ toolbar = canvas.toolbar
+
+ if toolbar is None or toolbar.mode == _Mode.NONE:
+ return
+
+ if event.key is None: # vertical scroll
+ toolbar.push_current()
+ ymin, ymax = ax.get_ylim()
+ delta = 0.05 * event.step * (ymax - ymin)
+ ax.set_ylim(ymin + delta, ymax + delta)
+ ax.figure.canvas.draw_idle()
+ elif event.key == 'shift': # horizontal scroll
+ toolbar.push_current()
+ xmin, xmax = ax.get_xlim()
+ delta = 0.05 * event.step * (xmax - xmin)
+ ax.set_xlim(xmin + delta, xmax + delta)
+ ax.figure.canvas.draw_idle()
+ elif event.key == 'control': # zoom
+ toolbar.push_current()
+ xmin, xmax = ax.get_xlim()
+ delta = 0.05 * event.step * (xmax - xmin)
+ ax.set_xlim(xmin + delta, xmax - delta)
+ ymin, ymax = ax.get_ylim()
+ delta = 0.05 * event.step * (ymax - ymin)
+ ax.set_ylim(ymin + delta, ymax - delta)
+ ax.figure.canvas.draw_idle()
+
+
class NonGuiException(Exception):
"""Raised when trying show a figure in a non-GUI backend."""
pass
@@ -2760,11 +2796,14 @@ def __init__(self, canvas, num):
self.key_press_handler_id = None
self.button_press_handler_id = None
+ self.scroll_handler_id = None
if rcParams['toolbar'] != 'toolmanager':
self.key_press_handler_id = self.canvas.mpl_connect(
'key_press_event', key_press_handler)
self.button_press_handler_id = self.canvas.mpl_connect(
'button_press_event', button_press_handler)
+ self.scroll_handler_id = self.canvas.mpl_connect(
+ 'scroll_event', scroll_handler)
self.toolmanager = (ToolManager(canvas.figure)
if mpl.rcParams['toolbar'] == 'toolmanager'
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