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# Use multiple layers to create a history of the current pattern.
# The "envelope" layer remembers all live cells.
# Author: Andrew Trevorrow (andrew@trevorrow.com), December 2006.
# Updated for better compatibility with envelope.pl, June 2007.
# Updated to use new setcolors command, September 2008.
import golly as g
if g.empty(): g.exit("There is no pattern.")
currindex = g.getlayer()
startindex = 0
envindex = 0
startname = "starting pattern"
envname = "envelope"
if currindex > 1 and g.getname(currindex - 1) == startname \
and g.getname(currindex - 2) == envname :
# continue from where we left off
startindex = currindex - 1
envindex = currindex - 2
elif currindex + 2 < g.numlayers() \
and g.getname(currindex + 1) == startname \
and g.getname(currindex) == envname :
# switch from envelope layer to current layer and continue
currindex += 2
g.setlayer(currindex)
startindex = currindex - 1
envindex = currindex - 2
elif currindex + 1 < g.numlayers() \
and g.getname(currindex) == startname \
and g.getname(currindex - 1) == envname :
# switch from starting layer to current layer and continue
currindex += 1
g.setlayer(currindex)
startindex = currindex - 1
envindex = currindex - 2
else:
# start a new envelope using pattern in current layer
if g.numlayers() + 1 > g.maxlayers():
g.exit("You need to delete a couple of layers.")
if g.numlayers() + 2 > g.maxlayers():
g.exit("You need to delete a layer.")
# get current layer's starting pattern
startpatt = g.getcells(g.getrect())
envindex = g.addlayer() # create layer for remembering all live cells
g.setcolors([-1,100,100,100]) # set all states to darkish gray
g.putcells(startpatt) # copy starting pattern into this layer
startindex = g.addlayer() # create layer for starting pattern
g.setcolors([-1,0,255,0]) # set all states to green
g.putcells(startpatt) # copy starting pattern into this layer
# move currindex to above the envelope and starting pattern
g.movelayer(currindex, envindex)
g.movelayer(envindex, startindex)
currindex = startindex
startindex = currindex - 1
envindex = currindex - 2
# name the starting and envelope layers so user can run script
# again and continue from where it was stopped
g.setname(startname, startindex)
g.setname(envname, envindex)
# ------------------------------------------------------------------------------
def envelope ():
# draw stacked layers using same location and scale
g.setoption("stacklayers", 1)
g.show("Hit escape key to stop script...")
while True:
g.run(1)
if g.empty():
g.show("Pattern died out.")
break
# copy current pattern to envelope layer;
# we temporarily disable event checking so thumb scrolling
# and other mouse events won't cause confusing changes
currpatt = g.getcells(g.getrect())
g.check(0)
g.setlayer(envindex)
g.putcells(currpatt)
g.setlayer(currindex)
g.check(1)
step = 1
exp = g.getstep()
if exp > 0:
step = g.getbase()**exp
if int(g.getgen()) % step == 0:
# display all 3 layers (envelope, start, current)
g.update()
# ------------------------------------------------------------------------------
# show status bar but hide layer & edit bars (faster, and avoids flashing)
oldstatus = g.setoption("showstatusbar", True)
oldlayerbar = g.setoption("showlayerbar", False)
oldeditbar = g.setoption("showeditbar", False)
try:
envelope()
finally:
# this code is always executed, even after escape/error;
# restore original state of status/layer/edit bars
g.setoption("showstatusbar", oldstatus)
g.setoption("showlayerbar", oldlayerbar)
g.setoption("showeditbar", oldeditbar)
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