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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<title>Path Editor — Matplotlib 2.0.2.post4416.dev0+g1df513f documentation</title>

type="text/css" />

type="text/css" />

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<h1>Path Editor<a class="headerlink" href="#path-editor" title="Permalink to this headline">¶</a></h1>

<div class="highlight-python"><div class="highlight"><pre>import numpy as np

import matplotlib.path as mpath

import matplotlib.patches as mpatches

import matplotlib.pyplot as plt

Path = <a href="../../api/path_api.html#matplotlib.path.Path" title="View documentation for matplotlib.path.Path">mpath.Path</a>

fig, ax = <a href="../../api/_as_gen/matplotlib.pyplot.subplots.html#matplotlib.pyplot.subplots" title="View documentation for matplotlib.pyplot.subplots">plt.subplots</a>()

pathdata = [

(Path.MOVETO, (1.58, -2.57)),

(Path.CURVE4, (0.35, -1.1)),

(Path.CURVE4, (-1.75, 2.0)),

(Path.CURVE4, (0.375, 2.0)),

(Path.LINETO, (0.85, 1.15)),

(Path.CURVE4, (2.2, 3.2)),

(Path.CURVE4, (3, 0.05)),

(Path.CURVE4, (2.0, -0.5)),

(Path.CLOSEPOLY, (1.58, -2.57)),

]

codes, verts = zip(*pathdata)

path = <a href="../../api/path_api.html#matplotlib.path.Path" title="View documentation for matplotlib.path.Path">mpath.Path</a>(verts, codes)

patch = <a href="../../api/_as_gen/matplotlib.patches.PathPatch.html#matplotlib.patches.PathPatch" title="View documentation for matplotlib.patches.PathPatch">mpatches.PathPatch</a>(path, facecolor='green', edgecolor='yellow', alpha=0.5)

ax.add_patch(patch)

class PathInteractor(object):

"""

An path editor.

Key-bindings

't' toggle vertex markers on and off. When vertex markers are on,

you can move them, delete them

"""

showverts = True

epsilon = 5 # max pixel distance to count as a vertex hit

def __init__(self, pathpatch):

self.ax = pathpatch.axes

canvas = self.ax.figure.canvas

self.pathpatch = pathpatch

self.pathpatch.set_animated(True)

x, y = zip(*self.pathpatch.get_path().vertices)

self.line, = ax.plot(x, y, marker='o', markerfacecolor='r', animated=True)

self._ind = None # the active vert

canvas.mpl_connect('draw_event', self.draw_callback)

canvas.mpl_connect('button_press_event', self.button_press_callback)

canvas.mpl_connect('key_press_event', self.key_press_callback)

canvas.mpl_connect('button_release_event', self.button_release_callback)

canvas.mpl_connect('motion_notify_event', self.motion_notify_callback)

self.canvas = canvas

def draw_callback(self, event):

self.background = self.canvas.copy_from_bbox(self.ax.bbox)

self.ax.draw_artist(self.pathpatch)

self.canvas.blit(self.ax.bbox)

def pathpatch_changed(self, pathpatch):

'this method is called whenever the pathpatchgon object is called'

# only copy the artist props to the line (except visibility)

vis = self.line.get_visible()

plt.Artist.update_from(self.line, pathpatch)

self.line.set_visible(vis) # don't use the pathpatch visibility state

def get_ind_under_point(self, event):

'get the index of the vertex under point if within epsilon tolerance'

# display coords

xy = np.asarray(self.pathpatch.get_path().vertices)

xyt = self.pathpatch.get_transform().transform(xy)

xt, yt = xyt[:, 0], xyt[:, 1]

d = np.sqrt((xt - event.x)**2 + (yt - event.y)**2)

ind = d.argmin()

if d[ind] >= self.epsilon:

ind = None

return ind

def button_press_callback(self, event):

'whenever a mouse button is pressed'

if not self.showverts:

return

if event.inaxes is None:

return

if event.button != 1:

return

self._ind = self.get_ind_under_point(event)

def button_release_callback(self, event):

'whenever a mouse button is released'

if not self.showverts:

return

if event.button != 1:

return

self._ind = None

def key_press_callback(self, event):

'whenever a key is pressed'

if not event.inaxes:

return

if event.key == 't':

self.showverts = not self.showverts

self.line.set_visible(self.showverts)

if not self.showverts:

self._ind = None

self.canvas.draw()

def motion_notify_callback(self, event):

'on mouse movement'

if not self.showverts:

return

if self._ind is None:

return

if event.inaxes is None:

return

if event.button != 1:

return

x, y = event.xdata, event.ydata

vertices = self.pathpatch.get_path().vertices

vertices[self._ind] = x, y

self.line.set_data(zip(*vertices))

self.canvas.restore_region(self.background)

interactor = PathInteractor(patch)

ax.set_title('drag vertices to update path')

ax.set_xlim(-3, 4)

ax.set_ylim(-3, 4)

<a href="../../api/_as_gen/matplotlib.pyplot.show.html#matplotlib.pyplot.show" title="View documentation for matplotlib.pyplot.show">plt.show</a>()

</pre></div>

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Total running time of the script: ( 0 minutes 0.035 seconds)

<a class="reference download internal" href="../../_downloads/path_editor.py" download=""><code class="xref download docutils literal">Download Python source code: path_editor.py</code></a></div>

<a class="reference download internal" href="../../_downloads/path_editor.ipynb" download=""><code class="xref download docutils literal">Download Jupyter notebook: path_editor.ipynb</code></a></div>

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