Make touch example work (#281)

* make touch example work

* Linters

Co-authored-by: martinRenou <[email protected]>

Author: haesleinhuepf

docs/conf.py

@@ -1,38 +1,30 @@
 # -*- coding: utf-8 -*-
-extensions = [
-    'sphinx.ext.autodoc',
-    'sphinx.ext.napoleon',
-    'jupyterlite_sphinx'
-]
+extensions = ["sphinx.ext.autodoc", "sphinx.ext.napoleon", "jupyterlite_sphinx"]
 
 jupyterlite_config = "jupyterlite_config.json"
 jupyterlite_dir = "."
 
-master_doc = 'index'
-source_suffix = '.rst'
+master_doc = "index"
+source_suffix = ".rst"
 
 # General information about the project.
-project = 'ipycanvas'
-author = 'Martin Renou'
+project = "ipycanvas"
+author = "Martin Renou"
 
 exclude_patterns = []
-highlight_language = 'python'
-pygments_style = 'sphinx'
+highlight_language = "python"
+pygments_style = "sphinx"
 
 # Output file base name for HTML help builder.
 html_logo = "./images/ipycanvas_logo.svg"
 html_favicon = "./images/ipycanvas_logo.ico"
 html_theme = "pydata_sphinx_theme"
-htmlhelp_basename = 'ipycanvasdoc'
+htmlhelp_basename = "ipycanvasdoc"
 
-html_theme_options = dict(
-    github_url='https://github.com/martinRenou/ipycanvas'
-)
+html_theme_options = dict(github_url="https://github.com/martinRenou/ipycanvas")
 
-html_static_path = ['_static']
+html_static_path = ["_static"]
 
-html_css_files = [
-    'custom.css'
-]
+html_css_files = ["custom.css"]
 
-autodoc_member_order = 'bysource'
+autodoc_member_order = "bysource"

docs/events.rst

@@ -41,13 +41,20 @@ Those methods take a callback function as single argument, this callback functio
 
 .. code-block:: python
 
+    import math
+
+    out = Output()
+
+
+    @out.capture()
     def handle_touch_move(fingers_locations):
         # Draw circles where fingers are located
         for finger_location in fingers_locations:
-            canvas.fill_arc(finger_location[0], finger_location[1], 6, 0, 2 * pi)
+            canvas.fill_arc(finger_location[0], finger_location[1], 6, 0, 2 * math.pi)
 
 
     canvas.on_touch_move(handle_touch_move)
+    display(out)
 
 .. note::
     Please open an issue or a Pull Request if you want more events to be supported by ipycanvas