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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
import numpy as np
from .widget import Widget
from ...visuals import AxisVisual
class AxisWidget(Widget):
"""Widget containing an axis
Parameters
----------
orientation : str
Orientation of the axis, 'left' or 'bottom'.
**kwargs : dict
Keyword arguments to pass to AxisVisual.
"""
def __init__(self, orientation='left', **kwargs):
if 'tick_direction' not in kwargs:
tickdir = {'left': (-1, 0), 'right': (1, 0), 'bottom': (0, 1),
'top': (0, -1)}[orientation]
kwargs['tick_direction'] = tickdir
self.axis = AxisVisual(**kwargs)
self.orientation = orientation
self._linked_view = None
Widget.__init__(self)
self.add_subvisual(self.axis)
def on_resize(self, event):
"""Resize event handler
Parameters
----------
event : instance of Event
The event.
"""
self._update_axis()
def _update_axis(self):
self.axis.pos = self._axis_ends()
def _axis_ends(self):
r = self.rect
if self.orientation == 'left':
return np.array([[r.right, r.top], [r.right, r.bottom]])
elif self.orientation == 'bottom':
return np.array([[r.left, r.bottom], [r.right, r.bottom]])
elif self.orientation == 'right':
return np.array([[r.left, r.top], [r.left, r.bottom]])
elif self.orientation == 'top':
return np.array([[r.left, r.top], [r.right, r.top]])
else:
raise RuntimeError(
'Orientation %s not supported.' % self.orientation)
def link_view(self, view):
"""Link this axis to a ViewBox
This makes it so that the axis's domain always matches the
visible range in the ViewBox.
Parameters
----------
view : instance of ViewBox
The ViewBox to link.
"""
if view is self._linked_view:
return
if self._linked_view is not None:
self._linked_view.scene.transform.changed.disconnect(
self._view_changed)
self._linked_view = view
view.scene.transform.changed.connect(self._view_changed)
self._view_changed()
def _view_changed(self, event=None):
"""Linked view transform has changed; update ticks."""
tr = self.node_transform(self._linked_view.scene)
p1, p2 = tr.map(self._axis_ends())
if self.orientation in ('left', 'right'):
self.axis.domain = (p1[1], p2[1])
else:
self.axis.domain = (p1[0], p2[0])
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