Question

目标：绘制图形（x，y）并将图形w.r.t上的垂直线移动到计时器。

我开始使用matplotlib实现这一点。可以使用matplotlib的draw（）功能来实现它，但它每次都会重新绘制cpu，因为它不允许我与图形交互。所以我决定使用matplotlib的动画功能。在未来，我还想暂停移动线。所以我不能使用matplotlib.animation.FuncAnimatin

问题：我使用canvas.copy_from_bbox（ax.bbox），ax.draw_artist（line），canvas.blit（ax.bbox）。但是，我无法将图形存储在背景中并在其上移动一条线。当我尝试存储时，它会以一种非常奇怪的方式覆盖。

这是我建立的代码。有人可以帮帮我吗？提前致谢。

import sys
import matplotlib.pyplot as p
import time
fig=p.figure();
ax = fig.add_subplot(1,1,1)

y=[];x=[];y1=[0,1000];x1=[0,0]
y=numpy.random.randn(1000,1)*100
x=numpy.arange(0,1000)
line1, = ax.plot(x,y,color='black');
ax.set_ylim(0, 1000);
line, = ax.plot(x1,y1,color='r',alpha=1,animated=True); # this is the line which i wanted to move over the graph w.r.t to time. ( i can also use axvline , but i guess its the same).
canvas = ax.figure.canvas
canvas.draw()
background = canvas.copy_from_bbox(ax.bbox); #my problem is here
starttime=time.time();
mytimer=0;
mytimer_ref=0;
def update(canvas,line,ax):
    canvas.restore_region(background) #my problem is here 
    t=time.time()-starttime;
    mytimer=t+mytimer_ref;
    x1=[mytimer,mytimer];
    line.set_xdata(x1);
    ax.draw_artist(line)
    canvas.blit(ax.bbox) #my problem is here

def onclick(event):
    global starttime
    starttime=time.time();
    global mytimer_ref;
    mytimer_ref=event.xdata;
    print "starttime",starttime;


cid=line1.figure.canvas.mpl_connect('button_press_event',onclick); # when i click the mouse over a point, line goes to that point and start moving from there. 
timer=fig.canvas.new_timer(interval=100);
args=[canvas,line,ax];
timer.add_callback(update,*args); # every 100ms it calls update function
timer.start();
p.show();

Answer 1

所以看起来你所指的“非常奇怪的方式”实际上是用你的background = canvas.copy_from_bbox(ax.bbox)捕获了错误的bbox。我相信这是大多数后端的已知问题，其中添加工具栏等会影响bbox的位置。

基本上，如果你可以在之后捕捉背景窗口弹出，那么一切都应该适合你。这可以通过多种方式完成，在您的情况下，最简单的方法是将canvas.draw()命令替换为plt.show(block=False)，这将调出窗口，而不会使其成为阻塞命令。

稍微补充一下，我确定你知道在python代码中不需要分号，但是在我调试的时候，我稍微整理了你的代码（没有完全结束）：

import sys import matplotlib.pyplot as plt import time import numpy fig = plt.figure() ax = fig.add_subplot(111) max_height = 100 n_pts = 100 y1 = [0, max_height] x1 = [0, 0] y = numpy.random.randn(n_pts) * max_height x = numpy.arange(0, n_pts) # draw the data line1, = ax.plot(x, y, color='black') # fix the limits of the plot ax.set_ylim(0, max_height) ax.set_xlim(0, n_pts) # draw the plot so that we can capture the background and then use blitting plt.show(block=False) # get the canvas object canvas = ax.figure.canvas background = canvas.copy_from_bbox(ax.bbox) # add the progress line. # XXX consider using axvline line, = ax.plot(x1, y1, color='r', animated=True) starttime=time.time() mytimer=0 mytimer_ref=0 def update(canvas, line, ax): # revert the canvas to the state before any progress line was drawn canvas.restore_region(background) # compute the distance that the progress line has made (based on running time) t = time.time() - starttime mytimer = t + mytimer_ref x1 = [mytimer,mytimer] # update the progress line with its new position line.set_xdata(x1) # draw the line, and blit the axes ax.draw_artist(line) canvas.blit(ax.bbox) def onclick(event): global starttime starttime=time.time() global mytimer_ref mytimer_ref=event.xdata print "starttime",starttime cid=line1.figure.canvas.mpl_connect('button_press_event',onclick) # when i click the mouse over a point, line goes to that point and start moving from there. timer=fig.canvas.new_timer(interval=100) args=[canvas,line,ax] timer.add_callback(update,*args) # every 100ms it calls update function timer.start() plt.show()

HTH

Matplotlib图中的进度线

1 个答案: