[英]Interactive bar plot using matplotlib with annotation change
I'm trying to create a horizontal bar plot that can dynamically change with a slider.我正在尝试创建一个可以随滑块动态更改的水平条形图。 I've followed the recipe on the matplotib website and it works well for line
data.我遵循了 matplotib 网站上的配方,它适用于line
数据。 The code:编码:
def interactive_pyramid(ages_matrix, year_labels):
fig, axs = plt.subplots()
plt.subplots_adjust(bottom=0.25)
l, = axs.plot(range(len(ages_matrix[0, :])), ages_matrix[0, :])
axs.annotate(year_labels[0], xy=(0.85, 0.85), xycoords="axes fraction")
axs.set_ylim([0,800])
pprint (dir(axs))
axcolor = 'lightgoldenrodyellow'
axyear = plt.axes([0.25, 0.1, 0.5, 0.1], axisbg=axcolor)
syear = Slider(axyear, 'Year', 0, ages_matrix.shape[0] - 1, 0)
def update(val):
year = syear.val
# axs.barh(range(len(ages_matrix[0, :])), ages_matrix[val, :])
l.set_ydata(ages_matrix[val, :])
# axs.annotate(year_labels[year], xy=(0.85, 0.85), xycoords="axes fraction")
axs.Annotation.remove()
fig.canvas.draw()
syear.on_changed(update)
ages_matrix is a 2d ndarray
and year_labels is a 1d ndarray
Ages_matrix 是一个2d ndarray
而 year_labels 是一个一1d ndarray
two main questions:两个主要问题:
axs.barh()
does not return an object with a set_ydata()
method do I can't change the y data. axs.barh()
不返回带有set_ydata()
方法的对象,我无法更改 y 数据。 if I just draw the data again on the axs object it doesn't erase the previous information, resulting in a clutter of charts.如果我只是在 axs 对象上再次绘制数据,它不会删除以前的信息,从而导致图表混乱。Is there any way to efficiently erase the ax and draw it again?有什么方法可以有效地擦除斧头并再次绘制它? maybe some way to refresh the canvas?也许某种方式来刷新画布?
That's what I came up with:这就是我想出的:
# Init Chart
fig, axs = plt.subplots()
plt.subplots_adjust(bottom=0.25)
axs.set_xlim([0,ages_matrix.max()*1.05])
# Initial Pyramid
pyramid = axs.barh(np.arange(len(ages_matrix[0, :])) * 5,
ages_matrix[0, :],
height=4.5)
# Annotation
ann = axs.annotate(year_labels[0], xy=(0.85, 0.85), xycoords="axes fraction")
# Slider
axcolor = 'lightgoldenrodyellow'
axyear = plt.axes([0.25, 0.1, 0.5, 0.1], axisbg=axcolor)
syear = Slider(axyear, 'Year', 0, ages_matrix.shape[0] - 1, 0)
def update(val):
t = syear.val
year = np.trunc(year_labels[t])
day = (year_labels[t] - year) * 365
ages = ages_matrix[t, :]
for i, p in enumerate(pyramid):
p.set_width(ages[i])
ann.set_text("Year: {}\nDay: {}".format(int(year), int(day)))
fig.canvas.draw()
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