When you mouseover an image shown with imshow, you can mouseover the image to inspect its RGB values. The bottom-right corner of the matplotlib window (sharing space with the toolbar), shows the image coordinates and RGB values of the pixel being pointed at:
x = 274.99 y = 235.584 [.241, .213, .203]
However, when I mouseover a quiver plot, it only shows the x and y coords of the pointer, but not the value of the 2D vector being pointed at. Is there a way to get the vector values to show up?
I would be fine with writing a custom mouse event handler, if I only knew how to set that bit of text in the matplotlib window.
There were times when the information about the color value was not present by default. In fact I think the current version is based on some code that came up in Stackoverflow on some question about that feature.
I quickly found those two questions:
The idea would be to change the function that is called when the mouse hovers the axes. This function is stored in ax.format_coord. So a possible solution is to write your custom function to return the desired output based on the input coordinates, e.g. something like
def format_coord(x, y):
try:
z = # get value depending on x,y, e.g. via interpolation on grid
# I can't fill this because the kind of data is unknown here
return "x: {}, y: {}, z: {}".format(x,y,z)
except:
return "x: {}, y: {}".format(x,y)
ax.format_coord = format_coord