Showing circles. Numpy array works fine but Field doesn't

[Deanodirector]

Hi, the Following code give me an error "AttributeError: 'ScalarField' object has no attribute 'astype'. Did you mean: 'dtype'?"

but works fine if I use a numpy array. If i print them out they are identical. Whats the issue here? thanks

`import taichi as ti
import numpy as np

ti.init(arch=ti.vulkan)

gui = ti.GUI('Circles Test', res=(640, 480))

numpoints = 20
centres = ti.field(ti.f32, shape=(numpoints, 2))
#centres = np.random.random((50, 2))

@ti.kernel
def randompoints():
for i, j in centres:
centres[i,j] =ti.random()

randompoints()
print(centres)

#center = [0.3, 0.5]

while gui.running:
gui.circles(centres, radius= 20, color=0xEEEEF0)
gui.show()`