我在matplotlib图中显示了一条数据曲线。我想在鼠标光标上附加一个文本框。即，当鼠标光标在图中移动时，文本框也随之移动。另外，我希望能够随着带有附加文本框的光标移动来更新文本框中的文本。
我从https://matplotlib.org/gallery/misc/cursor_demo_sgskip.html的matplotlib示例开始，但出于我的目的对其进行了修改却没有成功。我还查看了一些第三方软件包（例如mpldatacursor和mplcursors）；但是，这些似乎不适合我的应用。
以下是我正在尝试的一些代码，这些代码应该可以说明我要完成的工作。
# -*- coding: iso-8859-1 -*-#
#!/usr/bin/env python
# The following allows special characters to be in comments (e.g. the extended Swedish alphabet)
# coding:utf-8
import matplotlib.pyplot as plt
# For setting size and position of matplotlib figure
import matplotlib
matplotlib.use("WXAgg")
import numpy as np
class Cursor(object):
"""
Purpose: Define a cursor whose interesection will track points along a curve
"""
def __init__(self, ax):
self.ax = ax
self.lx = ax.axhline(color='k',linewidth=0.25) # the horiz line
self.ly = ax.axvline(color='k',linewidth=0.25) # the vert line
# Text location in axes coords
self.txt = ax.text(0.7, 0.9, '', transform=ax.transAxes)
def mouse_move(self, event):
'''
Purpose: respond to movement of the mouse
'''
if not event.inaxes: return
x, y = event.xdata, event.ydata
props = dict(boxstyle='round', facecolor='wheat', alpha=0.4)
self.ax.text(x, y, 'test', fontsize=8, bbox=props)
#self.ax.text(x,y,'')
#self.text(x, y, 'test', fontsize=8, bbox=props)
#ax.text(x, y, 'test', fontsize=8, bbox=props)
# Update the line positions
self.lx.set_ydata(y)
self.ly.set_xdata(x)
self.txt.set_text('x=%1.2f, y=%1.2f' % (x, y))
self.ax.text(x,y,'')
plt.draw()
class SnaptoCursor(object):
"""
Like Cursor but the current center of the crosshair at (x,y) will snap to the nearest
(x,y) on the curve.
For simplicity, I'm assuming x is sorted
"""
def __init__(self, ax, x, y):
self.ax = ax
self.lx = ax.axhline(color='k') # the horiz line
self.ly = ax.axvline(color='k') # the vert line
self.x = x
self.y = y
# Text location in axes coords
self.txt = ax.text(0.7, 0.9, '', transform=ax.transAxes)
def mouse_move(self, event):
"""
Purpose: Track the movement of the mouse coords and then update the position
of the intersection of the cursor cross-hairs
"""
if not event.inaxes:
return
x, y = event.xdata, event.ydata # x,y coordinates of mouse
props = dict(boxstyle='round', facecolor='wheat', alpha=0.4)
self.ax.text(x, y, 'test', fontsize=8, bbox=props)
#self.text(x, y, 'test', fontsize=8, bbox=props)
#ax.text(x, y, 'test', fontsize=8, bbox=props)
#self.ax.text(remove)
# Find closest pt on data curve to (x,y) of cross-air intersection
indx = min(np.searchsorted(self.x, [x])[0], len(self.x) - 1)
x = self.x[indx]
y = self.y[indx]
# Update the line positions
self.lx.set_ydata(y)
self.ly.set_xdata(x)
# place a text box in upper left in axes coords
#self.ax.text(x, y, 'test', transform=ax.transAxes, fontsize=8,
# verticalalignment='top', bbox=props)
self.txt.set_text('x=%1.2f, y=%1.2f' % (x, y))
print('x=%1.2f, y=%1.2f' % (x, y))
plt.draw()
t = np.arange(0.0, 1.0, 0.01)
s = np.sin(2 * 2 * np.pi * t)
fig, ax = plt.subplots(figsize=(14,7.5))
fig.canvas.set_window_title('TS with tracking cursor')
# Need the following to set position the plot
pltManager = plt.get_current_fig_manager()
pltManager.window.SetPosition((20,20)) # pixels offset from top left corner of display
# cursor = Cursor(ax)
cursor = SnaptoCursor(ax, t, s)
plt.connect('motion_notify_event', cursor.mouse_move)
ax.plot (t, s, 'o')
plt.axis([0, 1, -1, 1])
plt.grid(axis='both')
plt.show()
该文本框确实会用鼠标光标“粘住”，但在移动光标时不会删除它---这是需要解决的问题。向正确方向迈出的一小步
# -*- coding: iso-8859-1 -*-#
#!/usr/bin/env python
# The following allows special characters to be in comments (e.g. the extended Swedish alphabet)
# coding:utf-8
import matplotlib.pyplot as plt
# For setting size and position of matplotlib figure
import matplotlib
matplotlib.use("WXAgg")
import numpy as np
class SnaptoCursor(object):
"""
Like Cursor but the current center of the crosshair at (x,y) will snap to the nearest
(x,y) on the curve.
For simplicity, I'm assuming x is sorted
"""
def __init__(self, ax, x, y):
self.ax = ax
self.lx = ax.axhline(color='k') # the horiz line
self.ly = ax.axvline(color='k') # the vert line
self.tx = ax.text(0.0,0.0,'test') # the text to follow cursor
self.x = x
self.y = y
# Text location in axes coords
self.txt = ax.text(0.7, 0.9, '', transform=ax.transAxes)
def mouse_move(self, event):
"""
Purpose: Track the movement of the mouse coords and then update the position
of the intersection of the cursor cross-hairs
"""
if not event.inaxes:
return
x, y = event.xdata, event.ydata # x,y coordinates of mouse
self.tx.set_position((x,y))
# Find closest pt on data curve to (x,y) of cross-air intersection
indx = min(np.searchsorted(self.x, [x])[0], len(self.x) - 1)
x = self.x[indx]
y = self.y[indx]
# Update the line positions
self.lx.set_ydata(y)
self.ly.set_xdata(x)
self.txt.set_text('x=%1.2f, y=%1.2f' % (x, y))
print('x=%1.2f, y=%1.2f' % (x, y))
plt.draw()
t = np.arange(0.0, 1.0, 0.01)
s = np.sin(2 * 2 * np.pi * t)
fig, ax = plt.subplots(figsize=(14,7.5))
fig.canvas.set_window_title('TS with tracking cursor')
# Need the following to set position the plot
pltManager = plt.get_current_fig_manager()
pltManager.window.SetPosition((20,20)) # pixels offset from top left corner of display
cursor = SnaptoCursor(ax, t, s)
plt.connect('motion_notify_event', cursor.mouse_move)
ax.plot (t, s, 'o')
plt.axis([0, 1, -1, 1])
plt.grid(axis='both')
plt.show()
此代码将使用光标移动文本并擦除先前的文本。但是，随着光标的移动，我仍然无法更改文本！任何建议，将不胜感激：-）
答案 0 :(得分：0)
您每次移动鼠标时都在创建一个新的Text对象。您需要在__init__期间创建对象，然后在移动鼠标时简单地更新其位置/文本：
# -*- coding: iso-8859-1 -*-#
#!/usr/bin/env python
# The following allows special characters to be in comments (e.g. the extended Swedish alphabet)
# coding:utf-8
import matplotlib.pyplot as plt
# For setting size and position of matplotlib figure
import matplotlib
matplotlib.use("WXAgg")
import numpy as np
class Cursor(object):
"""
Purpose: Define a cursor whose interesection will track points along a curve
"""
def __init__(self, ax):
self.ax = ax
self.lx = ax.axhline(color='k',linewidth=0.25) # the horiz line
self.ly = ax.axvline(color='k',linewidth=0.25) # the vert line
# Text location in data coords
props = dict(boxstyle='round', facecolor='wheat', alpha=0.4)
self.txt = self.ax.text(0, 0, '', fontsize=8, bbox=props)
def mouse_move(self, event):
'''
Purpose: respond to movement of the mouse
'''
if not event.inaxes: return
x, y = event.xdata, event.ydata
self.txt.set_position((x,y))
# Update the line positions
self.lx.set_ydata(y)
self.ly.set_xdata(x)
self.txt.set_text('x=%1.2f, y=%1.2f' % (x, y))
plt.draw()
class SnaptoCursor(object):
"""
Like Cursor but the current center of the crosshair at (x,y) will snap to the nearest
(x,y) on the curve.
For simplicity, I'm assuming x is sorted
"""
def __init__(self, ax, x, y):
self.ax = ax
self.lx = ax.axhline(color='k') # the horiz line
self.ly = ax.axvline(color='k') # the vert line
self.x = x
self.y = y
# Text location in data coords
props = dict(boxstyle='round', facecolor='wheat', alpha=0.4)
self.txt = self.ax.text(0, 0, '', fontsize=8, bbox=props)
def mouse_move(self, event):
"""
Purpose: Track the movement of the mouse coords and then update the position
of the intersection of the cursor cross-hairs
"""
if not event.inaxes:
return
x, y = event.xdata, event.ydata # x,y coordinates of mouse
self.txt.set_position((x,y))
# Find closest pt on data curve to (x,y) of cross-air intersection
indx = min(np.searchsorted(self.x, [x])[0], len(self.x) - 1)
x = self.x[indx]
y = self.y[indx]
# Update the line positions
self.lx.set_ydata(y)
self.ly.set_xdata(x)
# place a text box in upper left in axes coords
#self.ax.text(x, y, 'test', transform=ax.transAxes, fontsize=8,
# verticalalignment='top', bbox=props)
self.txt.set_text('x=%1.2f, y=%1.2f' % (x, y))
print('x=%1.2f, y=%1.2f' % (x, y))
self.ax.figure.canvas.draw_idle()
t = np.arange(0.0, 1.0, 0.01)
s = np.sin(2 * 2 * np.pi * t)
fig, ax = plt.subplots(figsize=(14,7.5))
fig.canvas.set_window_title('TS with tracking cursor')
# cursor = Cursor(ax)
cursor = SnaptoCursor(ax, t, s)
plt.connect('motion_notify_event', cursor.mouse_move)
ax.plot (t, s, 'o')
plt.axis([0, 1, -1, 1])
plt.grid(axis='both')
plt.show()
答案 1 :(得分：0)
这里是Diziet Asahithat的代码的经过稍微编辑的版本，可以回答我的问题：
select ID, CREATION_TIME
from my_table
where ID = 4 and
CREATION_TIME between to_date('29/04/2017 12:01:00', 'DD/MM/YYYY HH:MI:SS[AM]') and to_date('29/04/2019 01:00:00', 'DD/MM/YYYY HH:MI:SS[AM]')
order by creation_time asc;
非常感谢您的努力DA：-）