Hi list,
I have just writen a new widget : a DragingCursor.
If anyone want and to try and use it ...
It is inspired from Cursor in widget module.
Samuel
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Samuel Garcia
Universite Claude Bernard LYON 1
CNRS - UMR5020, Laboratoire des Neurosciences et Systemes Sensoriels
50, avenue Tony Garnier
69366 LYON Cedex 07
FRANCE
Tél : 04 37 28 74 64
Fax : 04 37 28 76 01
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
import pylab
import new
#####################################################################
## DragingCursor
def on_move_canvas(self,event) :
if event.inaxes is None :return
for dragingcursor in self.list_dragingcursor :
if dragingcursor.moving :
#if event.inaxes != self.ax: return
dragingcursor.linev.set_xdata((event.xdata, event.xdata))
dragingcursor.lineh.set_ydata((event.ydata, event.ydata))
dragingcursor.linev.set_visible(dragingcursor.vertOn)
dragingcursor.lineh.set_visible(dragingcursor.horizOn)
dragingcursor._update()
def on_button_press_event_canvas(self,event) :
if event.inaxes is None :return
ax = event.inaxes
for dragingcursor in self.list_dragingcursor :
if dragingcursor.moving :
return
for dragingcursor in self.list_dragingcursor :
if dragingcursor.direction =='hor' :
delta = (ax.get_ylim()[1]-ax.get_ylim()[0])/25
coor = event.ydata
elif dragingcursor.direction =='ver' :
delta = (ax.get_xlim()[1]-ax.get_xlim()[0])/25
coor = event.xdata
if (dragingcursor.coor() > coor-delta) & (dragingcursor.coor() < coor+delta) :
dragingcursor.moving = True
return
def on_button_release_event_canvas(self,event) :
if event.inaxes is None :return
for dragingcursor in self.list_dragingcursor :
if dragingcursor.moving :
dragingcursor.moving = False
class DragingCursor :
def __init__(self , ax, direction = 'hor' , coor = 0. , useblit = False, **lineprops ) :
self.ax = ax
self.canvas = ax.figure.canvas
self.direction = direction
self.moving = False
self.visible = True
self.horizOn = False
self.vertOn = False
if direction =='ver' :
self.vertOn = True
if direction =='hor' :
self.horizOn = True
self.useblit = useblit
self.lineh = ax.axhline(y=coor, visible=self.horizOn, **lineprops)
self.linev = ax.axvline(x=coor, visible=self.vertOn, **lineprops)
self.background = None
self.needclear = False
if 'list_dragingcursor' not in dir(self.canvas) :
self.canvas.list_dragingcursor = []
self.canvas.on_move = new.instancemethod(on_move_canvas ,
self.canvas,
self.canvas.__class__)
self.canvas.on_button_press_event = new.instancemethod(on_button_press_event_canvas ,
self.canvas,
self.canvas.__class__)
self.canvas.on_button_release_event = new.instancemethod(on_button_release_event_canvas ,
self.canvas,
self.canvas.__class__)
self.canvas.mpl_connect('motion_notify_event', self.canvas.on_move)
self.canvas.mpl_connect('button_press_event', self.canvas.on_button_press_event)
self.canvas.mpl_connect('button_release_event', self.canvas.on_button_release_event)
self.canvas.list_dragingcursor.append(self)
#self.canvas.draw()
#self._update()
def coor(self) :
if self.direction =='hor' :
return self.lineh.get_ydata()[0]
elif self.direction =='ver' :
return self.linev.get_xdata()[0]
else :
return None
def _update(self):
if self.useblit:
if self.background is not None:
self.canvas.restore_region(self.background)
self.ax.draw_artist(self.linev)
self.ax.draw_artist(self.lineh)
self.canvas.blit(self.ax.bbox)
else:
self.canvas.draw_idle()
return False
def delete(self):
if self.useblit:
self.background = self.canvas.copy_from_bbox(self.ax.bbox)
self.linev.set_visible(False)
self.lineh.set_visible(False)
self.canvas.list_dragingcursor.remove(self)
#####################################################################
## Example
fig = pylab.figure(figsize=(8,6))
ax = fig.add_axes([0.075, 0.25, 0.9, 0.725], axisbg='#FFFFCC')
x,y = 4*(pylab.rand(2,100)-.5)
ax.plot(x,y,'o')
ax.set_xlim(-2,2)
ax.set_ylim(-2,2)
# set useblit = True on gtkagg for enhanced performance
#cursor = Cursor(ax, useblit=True, color='red', linewidth=2 )
a = DragingCursor(ax , coor = -0.5,direction = 'hor' , useblit=False, color='red', linewidth=2 )
b = DragingCursor(ax , coor = 0.5,direction = 'hor' , useblit=False, color='red', linewidth=2 )
c = DragingCursor(ax , coor = -0.5,direction = 'ver' , useblit=False, color='red', linewidth=2 )
d = DragingCursor(ax , coor = 0.5,direction = 'ver' , useblit=False, color='red', linewidth=2 )
pylab.show()
print a.coor(),b.coor(),c.coor(),d.coor()
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