Javascript Index Z

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When designing your layout with CSS, you often place elements up / down or left / right. The z-index allows elements to be moved to a third dimension on the Z axis, with an overlapping effect (one on top of the other).

z -index accepts the keyword auto or an integer. These are all valid statements:

Note : to apply the z-index, you must also position the elements, using the Position property relative, absolute or fixed. If no position is specified it will be like the application z-index: auto and no stack context will be applied

With that in mind, let’s take a look as an example. .

Let some guinea pigs

You can check this example at Codepen . Play with him and the program with me!

We are going to place two guinea pigs, or Cuys ( which sounds much nicer). Imagine it is summer, it is over 90 degrees outside. Cuy # 1 will be placed inside a lake, will have fun. Cuy # 2 is very lazy so we have to give him some coffee to wake him up! Next, we’re going to stack our Cuy # 2 with the coffee so it can drink.

Without positioning or CSS our images look something like this:.

 a shot 6 of 47 08/23/2020 at 2:00 PM

the idea is to create an overlay context using z-index, then place images above the lake and a cafe.

Additionally, remember we need to add positioning to our elements in order to apply the z-index. Let’s go ahead and place our Cuy # 1:

Where the hell is our friend? We’re going to go ahead and add more stacking context so it’s above the lake:

Yes! Our Cuy is above the lake. Now we need to add some padding to place it inside the lake, but I’ll let you play with this

>

Now that we know how to create an overlay context using z-index, we can place our second animal very easily:

Again the padding will be for the exact positioning of the image and the width is only used to specify the size of our boyfriend. happy and feel refreshed:

screen shot 2020 / 08/23 to 7 21 58 PM

Conclusion

Playing with z-index gives way to interesting ideas of setting page. On the Codepen I have also provided a second example of the pop design and the cat positioned with z-index on top of everything. Check it out!

Remember that you still have items in your place or z-index will not work. Try to play around with Codepen by removing the placement and see it for yourself .

Another recommendation is that you should apply z-index to sibling elements. In our examples our images are not nested and were sisters (side by side). If you have deeply nested elements, z-index may not work as expected . So keep that in mind.

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Javascript Index Z absolute: Questions

How to get an absolute file path in Python

3 answers

izb By izb

Given a path such as "mydir/myfile.txt", how do I find the file"s absolute path relative to the current working directory in Python? E.g. on Windows, I might end up with:

"C:/example/cwd/mydir/myfile.txt"
877

Answer #1

>>> import os
>>> os.path.abspath("mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

Also works if it is already an absolute path:

>>> import os
>>> os.path.abspath("C:/example/cwd/mydir/myfile.txt")
"C:/example/cwd/mydir/myfile.txt"

Javascript Index Z absolute: Questions

How to check if a path is absolute path or relative path in a cross-platform way with Python?

3 answers

UNIX absolute path starts with "/", whereas Windows starts with alphabet "C:" or "". Does python have a standard function to check if a path is absolute or relative?

175

Answer #1

os.path.isabs returns True if the path is absolute, False if not. The documentation says it works in windows (I can confirm it works in Linux personally).

os.path.isabs(my_path)

Javascript Index Z absolute: Questions

How to join absolute and relative urls?

3 answers

I have two urls:

url1 = "http://127.0.0.1/test1/test2/test3/test5.xml"
url2 = "../../test4/test6.xml"

How can I get an absolute url for url2?

139

Answer #1

You should use urlparse.urljoin :

>>> import urlparse
>>> urlparse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

With Python 3 (where urlparse is renamed to urllib.parse) you could use it as follow:

>>> import urllib.parse
>>> urllib.parse.urljoin(url1, url2)
"http://127.0.0.1/test1/test4/test6.xml"

Removing white space around a saved image in matplotlib

2 answers

I need to take an image and save it after some process. The figure looks fine when I display it, but after saving the figure, I got some white space around the saved image. I have tried the "tight" option for savefig method, did not work either. The code:

  import matplotlib.image as mpimg
  import matplotlib.pyplot as plt

  fig = plt.figure(1)
  img = mpimg.imread(path)
  plt.imshow(img)
  ax=fig.add_subplot(1,1,1)

  extent = ax.get_window_extent().transformed(fig.dpi_scale_trans.inverted())
  plt.savefig("1.png", bbox_inches=extent)

  plt.axis("off") 
  plt.show()

I am trying to draw a basic graph by using NetworkX on a figure and save it. I realized that without a graph it works, but when added a graph I get white space around the saved image;

import matplotlib.image as mpimg
import matplotlib.pyplot as plt
import networkx as nx

G = nx.Graph()
G.add_node(1)
G.add_node(2)
G.add_node(3)
G.add_edge(1,3)
G.add_edge(1,2)
pos = {1:[100,120], 2:[200,300], 3:[50,75]}

fig = plt.figure(1)
img = mpimg.imread("image.jpg")
plt.imshow(img)
ax=fig.add_subplot(1,1,1)

nx.draw(G, pos=pos)

extent = ax.get_window_extent().transformed(fig.dpi_scale_trans.inverted())
plt.savefig("1.png", bbox_inches = extent)

plt.axis("off") 
plt.show()
228

Answer #1

You can remove the white space padding by setting bbox_inches="tight" in savefig:

plt.savefig("test.png",bbox_inches="tight")

You"ll have to put the argument to bbox_inches as a string, perhaps this is why it didn"t work earlier for you.


Possible duplicates:

Matplotlib plots: removing axis, legends and white spaces

How to set the margins for a matplotlib figure?

Reduce left and right margins in matplotlib plot

228

Answer #2

I cannot claim I know exactly why or how my “solution” works, but this is what I had to do when I wanted to plot the outline of a couple of aerofoil sections — without white margins — to a PDF file. (Note that I used matplotlib inside an IPython notebook, with the -pylab flag.)

plt.gca().set_axis_off()
plt.subplots_adjust(top = 1, bottom = 0, right = 1, left = 0, 
            hspace = 0, wspace = 0)
plt.margins(0,0)
plt.gca().xaxis.set_major_locator(plt.NullLocator())
plt.gca().yaxis.set_major_locator(plt.NullLocator())
plt.savefig("filename.pdf", bbox_inches = "tight",
    pad_inches = 0)

I have tried to deactivate different parts of this, but this always lead to a white margin somewhere. You may even have modify this to keep fat lines near the limits of the figure from being shaved by the lack of margins.

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