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I have a program written in python using the module networkx to create a dynamic graph. It is a planer graph where the vertices remain constant but the edges change. Now I'm looking for a library that allows me to do two things, in a fast and quick manner preferably:
Drawing the vertices as the lattice points inside a rectangle, i.e.
Being able to select edges and vertices to change their color, position, weights, etc. as shown in the picture.
Thanks
For modest graph sizes, any good python graphics library should provide sufficient primitives to address this issue. For example, either Pyglet or PyGame would be suitable.
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I need help! I am looking for machine vision ways to detect the boxes to allow for the automation of these splits Image every box.
I tried many ways but I can't detect the grid/corner properly.
I need help, how I can do this work?
You can use the MatchTemplate function with the below template image.
After detecting all matching points with the template image, you can determine the corners of the each box.
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As part of my UI, I want to display graphs. The requirements are:
The graph must respond to events (e.g. mouse clicks).
If the graph is directed I want nice arrows.
If there are several edges spanning two nodes I want to display several edges.
The layout must be nice.
Now, there are two libraries: networkx and graphviz that can do some of those things. networkx can do 1 and (with some major hacks) 2. graphviz can do 2 and 3. 4 can be done by either library.
I would actually prefer to use graphviz because that would eliminate some dependencies; however, its inability to interact with matplotlib is a major problem.
Therefore, at the moment I am stuck with networkx, have to use a hack for arrows and abandon the idea of parallel edges.
My question is: Is this the state of the art or there is some other approach I could try?
Another question: Is it better to use a different language for graph visualization? For example, would it make sense to move all UI/visualization to JavaScript, while keeping Python only for data analysis?
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Just wondering if there was any easy way to create collision events on a Tkinter canvas, as I am attempting to create a game in Tkinter.
I have seen some complex ways, but I was wondering if there was a simple solution.
I have been using Tkinter much longer than I have been using pygame, so I would prefer to stick to Tkinter.
There is no built-in collision detection, other than the find_overlapping and find_enclosed methods of the canvas which can find objects that overlap or are enclosed by a rectangular region (and the fact that you can get the rectangular bounding box of any object).
You can create your own with tkinter's bbox to check if the collisions happen or to make your desired effect. you can use other great words in that link to help you on get your collision engine be nice and running.
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Im looking for a python library that could search an image and find the coordinates of smaller image file i give like the one in https://pyautogui.readthedocs.org/en/latest/screenshot.html#the-locate-functions. For example if i had http://i.stack.imgur.com/hWfBm.png
and i wanted to find all the spots with wild grass what would be the library that could help me do it?
Install the OpenCV library and link to the Python bindings in the system path. If you don't know how to do this, try Youtube for instructions that pertain to your operating system. From there, save an image containing one block of grass.
import cv2
import numpy as np
world = cv2.imread("world.png") # entire world image
grass = cv2.imread("grass.png") # grass image
result = cv2.matchTemplate(world, grass, cv2.TM_CCOEFF_NORMED)
print np.unravel_index(result.argmax(), result.shape)
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Looking for a library or framework to aid me with the following:
I receive (x,y,z) vectors every few milliseconds telling me how an object is moving. I want to draw a point in the center of the screen to start, and have it move about - outlining its path - until I tell it to stop.
Being in 3D, I'd need some easy way to rotate or pan around this animation to get different perspectives.
Any recommendations for what to use in Python to accomplish this? Maybe a simple game/graphics library?
I believe that PyOpenGL will give you access directly to OpenGL from python.
You could use pyqtgraph. I have been using it for 3d graphics plots. It has a method scatterplot that is quick in updating a point on the screen. You can also access the view with azimuth and elevation to orbit around the object. http://www.pyqtgraph.org/documentation/3dgraphics/glscatterplotitem.html it uses pyopengl underneath, but its a fast and simple way to access those functions.