I am looking to annotate a draggable circle with a number. The draggeable point is created from this class:
class DraggablePoint:
lock = None #only one can be animated at a time
def __init__(self, point):
self.point = point
self.press = None
self.background = None
def connect(self):
'connect to all the events we need'
self.cidpress = self.point.figure.canvas.mpl_connect('button_press_event', self.on_press)
self.cidrelease = self.point.figure.canvas.mpl_connect('button_release_event', self.on_release)
self.cidmotion = self.point.figure.canvas.mpl_connect('motion_notify_event', self.on_motion)
def on_press(self, event):
if event.inaxes != self.point.axes: return
if DraggablePoint.lock is not None: return
contains, attrd = self.point.contains(event)
if not contains: return
self.press = (self.point.center), event.xdata, event.ydata
DraggablePoint.lock = self
# draw everything but the selected point and store the pixel buffer
canvas = self.point.figure.canvas
axes = self.point.axes
self.point.set_animated(True)
canvas.draw()
self.background = canvas.copy_from_bbox(self.point.axes.bbox)
# now redraw just the rectangle
axes.draw_artist(self.point)
# and blit just the redrawn area
canvas.blit(axes.bbox)
def on_motion(self, event):
if DraggablePoint.lock is not self:
return
if event.inaxes != self.point.axes: return
self.point.center, xpress, ypress = self.press
dx = event.xdata - xpress
dy = event.ydata - ypress
self.point.center = (self.point.center[0] dx, self.point.center[1] dy)
canvas = self.point.figure.canvas
axes = self.point.axes
# restore the background region
canvas.restore_region(self.background)
# redraw just the current rectangle
axes.draw_artist(self.point)
# blit just the redrawn area
canvas.blit(axes.bbox)
def on_release(self, event):
'on release we reset the press data'
if DraggablePoint.lock is not self:
return
self.press = None
DraggablePoint.lock = None
# turn off the rect animation property and reset the background
self.point.set_animated(False)
self.background = None
# redraw the full figure
self.point.figure.canvas.draw()
def disconnect(self):
'disconnect all the stored connection ids'
self.point.figure.canvas.mpl_disconnect(self.cidpress)
self.point.figure.canvas.mpl_disconnect(self.cidrelease)
self.point.figure.canvas.mpl_disconnect(self.cidmotion)
I am plotting with this (circles.append the last loop is the interesting code for this problem):
drs = []
circles = []
for team, color, sec_color in zip([hometeam.loc[frame], awayteam.loc[frame]], team_colors, sec_colors):
x_columns = [c for c in team.keys() if
c[-2:].lower() == '_x' and c != 'ball_x'] # column header for player x positions
y_columns = [c for c in team.keys() if
c[-2:].lower() == '_y' and c != 'ball_y'] # column header for player y positions
for x, y in zip(team[x_columns], team[y_columns]):
#if ctr == 0:
circles.append(patches.Circle((x, y), 1.4, fc=color, edgecolor=sec_color, linewidth=1.2, zorder=2))
for circ in circles:
ax.add_patch(circ)
dr = DraggablePoint(circ)
dr.connect()
drs.append(dr)
plt.show()
I can plot text at the circles center, however once I drag a circle, the text stays at the original position. Is there a way to add text to the circles, which would move alongside the circles when dragged?
CodePudding user response:
Sure. Add a label, record the relative position to the circle, and update its position on motion.
import matplotlib.pyplot as plt
class DraggablePoint:
...
class LabelledDraggablePoint(DraggablePoint):
def __init__(self, point, label):
super().__init__(point)
self.label = label
x1, y1 = self.label.get_position()
x2, y2 = self.point.center
self.label_offset = (x1 - x2, y1 - y2)
def on_motion(self, event):
super().on_motion(event)
self.label.set_position(self.point.center self.label_offset)
if __name__ == '__main__':
fig, ax = plt.subplots()
point = plt.Circle((0.5, 0.5), 0.1)
ax.add_patch(point)
ax.set_aspect('equal')
label = ax.text(0.5, 0.5, 'Lorem ipsum', ha='center', va='center')
instance = LabelledDraggablePoint(point, label)
instance.connect()
plt.show()
On a different note: the blitting is nausea inducing. You will get much smoother animations without it. I would cut all of that out.