I am trying to capture a part of my screen with PIL.ImageGrab and then converting it to an numpy.array as you can see below.
np.array(ImageGrab.grab(bbox=(0, 0, 720, 480)))
What I can't figure out is, how to get this data into a Kivy window or a widget?
All my Widgets are in separate classes so I would like to have one Screen class with all the code necessary for this part of my Window.
I have already tried methods like this one, but I don't know how to implement it since Kivy confuses me a lot sometimes.
If my idea just isn't realizable, I guess you could save each captured frame as .jpg format and then load it into Kivy. But I imagine this is not the most efficient way.
Thanks a lot in advance! Dominik
Related
I'm embedding certain graphs into my tkinter GUI, and I noticed I have a lot of "empty space" around the figure.
There are 3 frames in the picture, first containing buttons above the figure, second containing the canvas that contains the figure, and third containing the test.
I've checked the graphs by plotting them outside of TkAgg and there is minimum empty space, so I suspect something goes wrong when I call FigureCanvasTkAgg.
Is it possible to control how much a matplotlib Figure fills Canvas widget?
code below:
canvas=FigureCanvasTkAgg(figure,master=canvasframe)
widget=canvas.get_tk_widget()
widget.pack()
Found the error. Error was in adding subplots to figure, I added with:
.add_subplots(221)
instead of
.add_subplots(121)
Really really basic error.
I have a script which plots some pandas data, and then either shows the plot interactively with plt.show(), or saves it to a file with plt.savefig(args.out).
import matplotlib.pyplot as plt
# set up the dataframe here
ax = df.plot.line(x=0, title=args.title, figsize=(12,8), grid=True, **kwargs)
if (args.out):
vprint("Saving figure to ", args.out, "...")
plt.savefig(args.out)
else:
vprint("Showing interactive plot...")
plt.show()
The question is, does the default matplotlib backend matter for the scenario where I save to a file with savefig? It definitely matters in the other case since it's used to display the interactive plot, but if I call savefig is another backend used entirely?
When showing a figure, the backend obviously matters, because it provides two things:
The renderer to draw the image
The GUI within which the image is shown.
When saving a figure, only the former matters. However, matplotlib provides a multitude of export formats. At the end, the chosen backend will determine what to do when a figure is saved, and in most cases, will use one of the existing non-interactive backends to produce the output file.
Some examples:
TkAgg will use the tkinter GUI to show a figure. For saving a png figure, it will fall back to the basic Agg backend to produce the png file. For saving an svg file, it will fall back to the svg backend, for saving a pdf it will fallback to the pdf backend, etc.
TkCairo, will use the tkinter GUI to show a figure. For saving a png figure, it will fall back to the basic Cairo backend to produce the png file. For the rest, same as above.
Qt5Agg will use the PyQt GUI to show a figure. For png will fall back to Agg. For others same as above.
similar for other backends.
IMAGE
when I click file>>save as png...
It will save as png to that penguin. Is it possible?
It is possible but the image must be a tkinter PhotoImage.
The picture of your program suggests that it's not a photoimage. However; google "tkinter PhotoImage" and you will find information on how to build one pixel by pixel or however you want. Once you have a photoimage, saving it is easy:
image.write('some_name.png', format='png')
I'm using the C-based screenshot concept from JHolta's answer in Take a screenshot via a python script. [Linux] in order to generate screenshots I'd like to display in PyGame. With some minor tweaks (prepending extern "C" to the functions and importing Xutil instead of Xlib) the provided code works amazingly well. In short, it uses Image.frombuffer on a byte array returned by the C library. With show(), the image and anything about it I manipulate is displayed by ImageMagick.
However, if I convert it to Python 3's PyGame as per PIL and pygame.image, I only get a black surface. It's not a straightforward issue, though: If I draw onto the image before converting it into a PyGame image (like in the OP of the latter link), that does show on a black background when blitting the result. Furthermore, printing the byte objects from PILImage.tobytes and pygame.image.tostring shows they both contain data and their len is identical.
What am I doing wrong here? I'll gladly provide code if necessary, but I think it's more of a conceptual issue and I didn't really change the snippets from these answers a lot.
(Similar issue in Python 2, by the way, but there PyGame uses str instead of byte for tostring / fromstring and printing the tostring appears to yield an empty string.)
It turns out that a buggy trigger caused the screenshoot to be taken again while the fullscreen window displaying it was opening. I suppose there are a few milliseconds of blackness or of an undefined state (in the context of the screenshot function) at that moment, and the library is fast enough to catch that.
I'm not sure if this should stay up because it's basically a reminder to check for things that a human can't perceive. Feel free to delete if it's not appropriate.
I am making a game, and I want it to be fullscreen. However, the pygame fullscreen is strange, creating a screen too large. So I referred to this: Pygame FULLSCREEN Display Flag Creates A Game Screen That Is Too Large For The Screen. However, when I followed these instructions
import ctypes
ctypes.windll.user32.SetProcessDPIAware()
true_res = (ctypes.windll.user32.GetSystemMetrics(0), ctypes.windll.user32.GetSystemMetrics(1))
pygame.display.set_mode(true_res,pygame.FULLSCREEN)
from an answer (but instead using pywin32 instead of ctypes, like this: win32api.GetSystemMetric(0)).
I used this, and while it does create a fullscreen, it also creates a black border around my screen and enlarges everything a slight bit, including my cursor. How can I get rid of this black border and get all shapes to normal size? Or is there a better way to create a good fullscreen?
If it helps, I use Windows 10.
Thanks in advance!
I think the problem of enlarging everything arose with the use of ctypes module as because the ctypes module makes use of a function named as GetSystemMetrics() whose work is to get the size of the screen of your system.
And might be the import pygame is loading some dll that is not compatible with a dll that windll needs.
So I suggest either you update the ctype library or pygame library or update both libraries or you can enlarge screen size by providing custom width and height values according to the resolution supported by your system.
Hope this helps !!