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# Allow user to move a connected group of live cells.
# Author: Andrew Trevorrow (andrew@trevorrow.com), Jan 2011.
import golly as g
from glife import rect, getminbox
ncells = [] # list of neighboring live cells
# set edges of bounded grid for later use
if g.getwidth() > 0:
gridl = -int(g.getwidth()/2)
gridr = gridl + g.getwidth() - 1
if g.getheight() > 0:
gridt = -int(g.getheight()/2)
gridb = gridt + g.getheight() - 1
# --------------------------------------------------------------------
def showhelp():
g.note(
"""Alt-clicking on an object allows you to COPY
it to another location (the original object
is not deleted).
While dragging the object the following keys
can be used:
x - flip object left-right
y - flip object top-bottom
> - rotate object clockwise
< - rotate object anticlockwise
escape - abort and restore the object""")
# ------------------------------------------------------------------------------
def getstate(x, y):
# first check if x,y is outside bounded grid
if g.getwidth() > 0 and (x < gridl or x > gridr): return 0
if g.getheight() > 0 and (y < gridt or y > gridb): return 0
return g.getcell(x, y)
# ------------------------------------------------------------------------------
def findlivecell(x, y):
if g.getcell(x, y) > 0: return [x, y]
# spiral outwards from x,y looking for a nearby live cell;
# the smaller the scale the smaller the area searched
maxd = 10
mag = g.getmag()
if mag > 0:
# mag can be 1..5 (ie. scales 1:2 to 1:32)
maxd = 2 * (6 - mag) # 10, 8, 6, 4, 2
d = 1
while d <= maxd:
x -= 1
y -= 1
for i in xrange(2*d):
x += 1 # move east
if getstate(x, y) > 0: return [x, y]
for i in xrange(2*d):
y += 1 # move south
if getstate(x, y) > 0: return [x, y]
for i in xrange(2*d):
x -= 1 # move west
if getstate(x, y) > 0: return [x, y]
for i in xrange(2*d):
y -= 1 # move north
if getstate(x, y) > 0: return [x, y]
d += 1
return [] # failed to find a live cell
# ------------------------------------------------------------------------------
def checkneighbor(x, y):
# first check if x,y is outside bounded grid
if g.getwidth() > 0 and (x < gridl or x > gridr): return
if g.getheight() > 0 and (y < gridt or y > gridb): return
if g.getcell(x, y) == 0: return
# no need for next test because we kill cell after adding it to ncells
# if (x, y) in ncells: return False
ncells.append( (x, y, g.getcell(x,y)) )
g.setcell(x, y, 0)
# ------------------------------------------------------------------------------
def getobject(x, y):
object = []
ncells.append( (x, y, g.getcell(x,y)) )
g.setcell(x, y, 0)
while len(ncells) > 0:
# remove cell from end of ncells and append to object
x, y, s = ncells.pop()
object.append(x)
object.append(y)
object.append(s)
# add any live neighbors to ncells
checkneighbor(x , y+1)
checkneighbor(x , y-1)
checkneighbor(x+1, y )
checkneighbor(x-1, y )
checkneighbor(x+1, y+1)
checkneighbor(x+1, y-1)
checkneighbor(x-1, y+1)
checkneighbor(x-1, y-1)
# append padding int if necessary
if len(object) > 0 and (len(object) & 1) == 0: object.append(0)
g.putcells(object)
return object
# ------------------------------------------------------------------------------
def underneath(object):
# return list of live cells underneath given object (a multi-state list)
cells = []
objlen = len(object)
if objlen % 3 == 1: objlen -= 1 # ignore padding int
i = 0
while i < objlen:
x = object[i]
y = object[i+1]
s = g.getcell(x, y)
if s > 0:
cells.append(x)
cells.append(y)
cells.append(s)
i += 3
# append padding int if necessary
if len(cells) > 0 and (len(cells) & 1) == 0: cells.append(0)
return cells
# ------------------------------------------------------------------------------
def rectingrid(r):
# return True if all of given rectangle is inside grid
if g.getwidth() > 0 and (r[0] < gridl or r[0] + r[2] - 1 > gridr): return False
if g.getheight() > 0 and (r[1] < gridt or r[1] + r[3] - 1 > gridb): return False
return True
# ------------------------------------------------------------------------------
def lookforkeys(event):
global oldcells, object
# look for keys used to flip/rotate object
if event == "key x none" or event == "key y none":
# flip floating object left-right or top-bottom
g.putcells(object, 0, 0, 1, 0, 0, 1, "xor") # erase object
if len(oldcells) > 0: g.putcells(oldcells)
obox = getminbox(object)
if event == "key x none":
# translate object so that bounding box doesn't change
xshift = 2 * (obox.left + int(obox.wd/2))
if obox.wd % 2 == 0: xshift -= 1
object = g.transform(object, xshift, 0, -1, 0, 0, 1)
else:
# translate object so that bounding box doesn't change
yshift = 2 * (obox.top + int(obox.ht/2))
if obox.ht % 2 == 0: yshift -= 1
object = g.transform(object, 0, yshift, 1, 0, 0, -1)
oldcells = underneath(object)
g.putcells(object)
g.update()
return
if event == "key > none" or event == "key < none":
# rotate floating object clockwise or anticlockwise
# about the center of the object's bounding box
obox = getminbox(object)
midx = obox.left + int(obox.wd/2)
midy = obox.top + int(obox.ht/2)
newleft = midx + obox.top - midy
newtop = midy + obox.left - midx
rotrect = [ newleft, newtop, obox.ht, obox.wd ]
if not rectingrid(rotrect):
g.show("Rotation is not allowed if object would be outside grid.")
return
g.putcells(object, 0, 0, 1, 0, 0, 1, "xor") # erase object
if len(oldcells) > 0: g.putcells(oldcells)
if event == "key > none":
# rotate clockwise
object = g.transform(object, 0, 0, 0, -1, 1, 0)
else:
# rotate anticlockwise
object = g.transform(object, 0, 0, 0, 1, -1, 0)
# shift rotated object to same position as rotrect
obox = getminbox(object)
object = g.transform(object, newleft - obox.left, newtop - obox.top)
oldcells = underneath(object)
g.putcells(object)
g.update()
return
if event == "key h none":
# best not to show Help window while dragging object!
return
g.doevent(event)
# ------------------------------------------------------------------------------
def moveobject():
global oldcells, object, object1
# wait for click in or near a live cell
while True:
event = g.getevent()
if event.startswith("click"):
# event is a string like "click 10 20 left none"
evt, xstr, ystr, butt, mods = event.split()
result = findlivecell(int(xstr), int(ystr))
if len(result) > 0:
prevx = int(xstr)
prevy = int(ystr)
oldmouse = xstr + ' ' + ystr
g.show("Extracting object...")
x, y = result
object = getobject(x, y)
object1 = list(object) # save in case user aborts script
if mods == "alt":
# don't delete object
oldcells = list(object)
break
else:
g.warn("Click on or near a live cell belonging to the desired object.")
elif event == "key h none":
showhelp()
else:
g.doevent(event)
# wait for mouse-up while moving object
g.show("Move mouse and release button...")
mousedown = True
while mousedown:
event = g.getevent()
if event.startswith("mup"):
mousedown = False
elif len(event) > 0:
lookforkeys(event)
mousepos = g.getxy()
if len(mousepos) > 0 and mousepos != oldmouse:
# mouse has moved, so move object
g.putcells(object, 0, 0, 1, 0, 0, 1, "xor") # erase object
if len(oldcells) > 0: g.putcells(oldcells)
xstr, ystr = mousepos.split()
x = int(xstr)
y = int(ystr)
if g.getwidth() > 0:
# ensure object doesn't move beyond left/right edge of grid
obox = getminbox( g.transform(object, x - prevx, y - prevy) )
if obox.left < gridl:
x += gridl - obox.left
elif obox.right > gridr:
x -= obox.right - gridr
if g.getheight() > 0:
# ensure object doesn't move beyond top/bottom edge of grid
obox = getminbox( g.transform(object, x - prevx, y - prevy) )
if obox.top < gridt:
y += gridt - obox.top
elif obox.bottom > gridb:
y -= obox.bottom - gridb
object = g.transform(object, x - prevx, y - prevy)
oldcells = underneath(object)
g.putcells(object)
prevx = x
prevy = y
oldmouse = mousepos
g.update()
# ------------------------------------------------------------------------------
if len(g.getrect()) == 0: g.exit("There are no objects.")
g.show("Click on or near live cell, move mouse and release button... (hit 'h' for help)")
oldcursor = g.getcursor()
g.setcursor("Move")
oldcells = [] # cells under moved object
object = [] # cells in moving object
object1 = [] # cells in initial object
try:
aborted = True
moveobject()
aborted = False
finally:
g.setcursor(oldcursor)
if aborted:
# erase object if it moved
if len(object) > 0: g.putcells(object, 0, 0, 1, 0, 0, 1, "xor")
if len(oldcells) > 0: g.putcells(oldcells)
if len(object1) > 0: g.putcells(object1)
else:
g.show(" ")
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