interface_color = 'black'
disable_color = 'gray'
active_color = 'red'
rho_color = 'black'
mu_color = 'green'
P_color = 'blue'
theta_color = 'orange'
profile_colors = [rho_color, mu_color, P_color, theta_color]
[docs]class BaseInteractor(object):
"""
Share some functions between the interface interactor and various layer
interactors.
Individual interactors need the following functions:
save(ev) - save the current state for later restore
restore() - restore the old state
move(x,y,ev) - move the interactor to position x,y
moveend(ev) - end the drag event
update() - draw the interactors
The following are provided by the base class:
connect_markers(markers) - register callbacks for all markers
clear_markers() - remove all items in self.markers
onHilite(ev) - enter/leave event processing
onLeave(ev) - enter/leave event processing
onClick(ev) - mouse click: calls save()
onRelease(ev) - mouse click ends: calls moveend()
onDrag(ev) - mouse move: calls move() or restore()
onKey(ev) - keyboard move: calls move() or restore()
Interactor attributes:
base - model we are operating on
axes - axes holding the interactor
color - color of the interactor in non-active state
markers - list of handles for the interactor
"""
def __init__(self, base, axes, color='black'):
"""
"""
self.base = base
self.axes = axes
self.color = color
self.clickx = None
self.clicky = None
self.markers = []
if isinstance(base.data, list):
self.data = self.base.data[0]
else:
self.data = self.base.data
[docs] def clear_markers(self):
"""
Clear old markers and interfaces.
"""
for h in self.markers: h.remove()
if self.markers:
self.base.connect.clear(*self.markers)
self.markers = []
[docs] def save(self, ev):
"""
"""
pass
[docs] def restore(self, ev):
"""
"""
pass
[docs] def move(self, x, y, ev):
"""
"""
pass
[docs] def moveend(self, ev):
"""
"""
pass
[docs] def connect_markers(self, markers):
"""
Connect markers to callbacks
"""
for h in markers:
connect = self.base.connect
connect('enter', h, self.onHilite)
connect('leave', h, self.onLeave)
connect('click', h, self.onClick)
connect('release', h, self.onRelease)
connect('drag', h, self.onDrag)
connect('key', h, self.onKey)
[docs] def onHilite(self, ev):
"""
Hilite the artist reporting the event, indicating that it is
ready to receive a click.
"""
ev.artist.set_color(active_color)
self.base.draw()
return True
[docs] def onLeave(self, ev):
"""
Restore the artist to the original colour when the cursor leaves.
"""
ev.artist.set_color(self.color)
self.base.draw()
return True
[docs] def onClick(self, ev):
"""
Prepare to move the artist. Calls save() to preserve the state for
later restore().
"""
self.clickx, self.clicky = ev.xdata, ev.ydata
self.save(ev)
return True
[docs] def onRelease(self, ev):
"""
"""
self.moveend(ev)
return True
[docs] def onDrag(self, ev):
"""
Move the artist. Calls move() to update the state, or restore() if
the mouse leaves the window.
"""
inside, _ = self.axes.contains(ev)
if inside:
self.clickx, self.clicky = ev.xdata, ev.ydata
self.move(ev.xdata, ev.ydata, ev)
else:
self.restore()
self.base.update()
return True
[docs] def onKey(self, ev):
"""
Respond to keyboard events. Arrow keys move the widget. Escape
restores it to the position before the last click.
Calls move() to update the state. Calls restore() on escape.
"""
if ev.key == 'escape':
self.restore()
elif ev.key in ['up', 'down', 'right', 'left']:
dx, dy = self.dpixel(self.clickx, self.clicky, nudge=ev.control)
if ev.key == 'up':
self.clicky += dy
elif ev.key == 'down':
self.clicky -= dy
elif ev.key == 'right':
self.clickx += dx
else: self.clickx -= dx
self.move(self.clickx, self.clicky, ev)
else:
return False
self.base.update()
return True
[docs] def dpixel(self, x, y, nudge=False):
"""
Return the step size in data coordinates for a small
step in screen coordinates. If nudge is False (default)
the step size is one pixel. If nudge is True, the step
size is 0.2 pixels.
"""
ax = self.axes
px, py = ax.transData.inverse_xy_tup((x, y))
if nudge:
nx, ny = ax.transData.xy_tup((px + 0.2, py + 0.2))
else:
nx, ny = ax.transData.xy_tup((px + 1.0, py + 1.0))
dx, dy = nx - x, ny - y
return dx, dy