pixels = W:1024 H:1024

x = from -0.25 to 0.25 W
y = from -0.25 to 0.25 H

t = PI/2
w = 0.01

qx =  cos(t)*x + sin(t)*y
qy = -sin(t)*x + cos(t)*y


r = 0.2
c1 = smoothstep(r, r+w, length2(qx, qy))+(1.0-step(0.0, qx))
    
r = 0.1
c1 = c1 + 1.0-smoothstep(r, r+w, length2(qx,qy-0.1))
c1 = min(c1, 1.0)
    
r = r - 0.003
c1 = c1*smoothstep(r, r+w, length2(qx,qy+0.105))
    
r = 0.005
c1 = c1 + 1.0-smoothstep(r, r+w, length2(qx,qy+0.1))
c1 = c1*smoothstep(r, r+w, length2(qx,qy-0.1))
    
r = 0.2
c2 = smoothstep(r, r+w, length2(qx,qy))
    
r = 0.185
c2 = c2 + 1.0-smoothstep(r, r+w, length2(qx,qy))

c2 = min(c2, 1.0)
    
c1 = c1*c2
c1 = min(c1, 1.0)

r = c1
g = r
b = r
