Hello.
I've poste here a question but no one seems to have an hint to give so I
repeat my question here.
In the attached Python 3 code, I draw n**2 squares in black and then I
dynamically change in a random way the colors of some squares.
The problem I met is that at each new random choice, I redraw all the
squares. I know that it is stupid for large number of squares.
Is there a way to change some propriety of one square, and then to ask to
matplotlib to redraw only what have changed ? I'm looking for something
similar to `blint` for animations.
Christophe BAL
#!/usr/bin/env python3
from random import randint, choice
import matplotlib.pyplot as plt
import matplotlib.patches as mpatches
import matplotlib.colors as colors
import matplotlib
# ------------------- #
# -- SOME SETTINGS -- #
# ------------------- #
matplotlib.rc_context({'toolbar':False})
background_color = "black"
colors = [
'gray',
'red',
'blue',
'magenta',
'green',
'cyan',
'yellow',
]
# ---------------- #
# -- DIMENSIONS -- #
# ---------------- #
# Not too slow
width = 16
height = 16
# Very slow
width = 64
height = 64
# ------------ #
# -- FIGURE -- #
# ------------ #
fig = plt.figure()
plt.axes(
xlim = (0, width),
ylim = (0, height),
aspect = 'equal'
)
plt.axis('off')
plotgrid = []
for line in range(height):
plotgrid.append([])
for col in range(width):
rect = mpatches.Rectangle(
(col, line), 1, 1,
facecolor = background_color,
edgecolor = background_color
)
plt.gca().add_patch(rect)
plotgrid[-1].append(rect)
# ---------------------- #
# -- BINDINGS - TIMER -- #
# ---------------------- #
def update():
global colors, width, height
x = randint(0, width - 1)
y = randint(0, height - 1)
plotgrid[y][x].set_facecolor(choice(colors))
plt.draw()
def onkey(event):
if event.key == "q":
sys.exit()
fig.canvas.mpl_connect('key_press_event', onkey)
timer = fig.canvas.new_timer(interval = 1)
timer.add_callback(update)
timer.start()
plt.show()
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