Trying to display UI, mainy realtime data graphics and statistics on a screen directly connected to rpi3.
Using some example code from Getting started with Vispy
been trying to display anything, but when running the example code i only get a warning message:
"WARNING: QXcbConnection: Could not connect to display"
As far as i understand i have installed all the dependencies numpy, matlibplot, pyqt5 and others. Supposedly enabled opwnGL on rpi following the video How to Enable OpenGL in Raspberry Pi Cant understand the main problem. Firstly is it possible to use vispy on raspberry and are there any suggestions as to how do i connect to the display from my code?
example code:
import numpy as np
from vispy import app
from vispy import gloo
c = app.Canvas(keys='interactive')
vertex = """
attribute vec2 a_position;
void main (void)
{
gl_Position = vec4(a_position, 0.0, 1.0);
}
"""
Also tried an example from Matplotlib Animation Tutorial
But this also end in an error : "_thinker.TclError: coulnt connect to display"
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
// First set up the figure, the axis, and the plot element we want to animate
fig = plt.figure()
ax = plt.axes(xlim=(0, 2), ylim=(-2, 2))
line, = ax.plot([], [], lw=2)
// initialization function: plot the background of each frame
def init():
line.set_data([], [])
return line,
// animation function. This is called sequentially
def animate(i):
x = np.linspace(0, 2, 1000)
y = np.sin(2 * np.pi * (x - 0.01 * i))
line.set_data(x, y)
return line,
// call the animator. blit=True means only re-draw the parts that have changed.
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=200, interval=20, blit=True)
anim.save('basic_animation.mp4', fps=30, extra_args=['-vcodec', 'libx264'])
plt.show()
