Tessellations

rem Tessellations program
graphsize 600,600
fastgraphics
l=180 : u=1: gosub tessellation
l=120 : u=1 :gosub tessellation
l=90 : u=2 :gosub tessellation
l=60 : u=2: gosub tessellation
l=60 : u=3: gosub tessellation
l=45 : u=4 : gosub tessellation
l=40 : u=3: gosub tessellation
l=36 : u=5: gosub tessellation
l=30 : u=4 :gosub tessellation
l=30 : u=6 :gosub tessellation
tessellation:
for i = 1 to 50
x1=300: y1=300: angle = 270
for b = 1 to 20
a = l*int(rand*2)-l/2
for k= 1 to u
angle = angle + a: gosub lines
next k
next b
refresh
next i
clg : pause 1: refresh
return
lines:
r = (angle/180)*pi
y2=y1 + (sin (r))*20: x2=x1 - (cos (r))*20
for n = 1 to 30
circle x1,y1,2: line x1,y1,x2,y2
next n
x1=x2: y1=y2
return