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# Allow user to move the current selection.
# Author: Andrew Trevorrow (andrew@trevorrow.com), Jan 2011.
import golly as g
# 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 in the selection allows you
to COPY it to another location (the original
selection is not deleted).
While moving the selection the following
keys can be used:
x - flip selection left-right
y - flip selection top-bottom
> - rotate selection clockwise
< - rotate selection anticlockwise
h - show this help
escape - abort and restore the selection""")
# ------------------------------------------------------------------------------
def cellinrect(x, y, r):
# return True if given cell position is inside given rectangle
if x < r[0] or x >= r[0] + r[2]: return False
if y < r[1] or y >= r[1] + r[3]: return False
return True
# ------------------------------------------------------------------------------
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, deltax, deltay):
global oldcells, selrect, selpatt
# look for keys used to flip/rotate selection
if event == "key x none" or event == "key y none":
# flip floating selection left-right or top-bottom
if len(oldcells) > 0:
g.clear(0)
g.putcells(selpatt, deltax, deltay)
if " x " in event:
g.flip(0)
else:
g.flip(1)
selpatt = g.transform(g.getcells(selrect), -deltax, -deltay)
if len(oldcells) > 0:
g.clear(0)
g.putcells(oldcells)
g.putcells(selpatt, deltax, deltay)
g.update()
return
if event == "key > none" or event == "key < none":
# rotate floating selection clockwise or anticlockwise;
# because we use g.rotate below we have to use the exact same
# calculation (see Selection::Rotate in wxselect.cpp) for rotrect:
midx = selrect[0] + int((selrect[2]-1)/2)
midy = selrect[1] + int((selrect[3]-1)/2)
newleft = midx + selrect[1] - midy
newtop = midy + selrect[0] - midx
rotrect = [ newleft, newtop, selrect[3], selrect[2] ]
if not rectingrid(rotrect):
g.show("Rotation is not allowed if selection would be outside grid.")
return
g.clear(0)
if len(oldcells) > 0: g.putcells(oldcells)
oldcells = g.join(oldcells, g.getcells(rotrect))
g.clear(0)
g.select(rotrect)
g.clear(0)
g.select(selrect)
g.putcells(selpatt, deltax, deltay)
if " > " in event:
g.rotate(0)
else:
g.rotate(1)
selrect = g.getselrect()
selpatt = g.transform(g.getcells(selrect), -deltax, -deltay)
if len(oldcells) > 0:
g.clear(0)
g.putcells(oldcells)
g.putcells(selpatt, deltax, deltay)
g.update()
return
if event == "key h none":
# best not to show Help window while dragging selection!
return
g.doevent(event)
# ------------------------------------------------------------------------------
def moveselection():
global oldcells, selrect, selpatt
# wait for click in selection
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()
x = int(xstr)
y = int(ystr)
if cellinrect(x, y, selrect):
oldmouse = xstr + ' ' + ystr
firstx = x
firsty = y
xoffset = firstx - selrect[0]
yoffset = firsty - selrect[1]
if mods == "alt":
# don't delete pattern in selection
oldcells = g.getcells(selrect)
break
elif event == "key h none":
showhelp()
else:
g.doevent(event)
# wait for mouse-up while moving selection
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, x - firstx, y - firsty)
# update xoffset,yoffset in case selection was rotated
xoffset = x - selrect[0]
yoffset = y - selrect[1]
mousepos = g.getxy()
if len(mousepos) > 0 and mousepos != oldmouse:
# mouse has moved, so move selection rect and pattern
g.clear(0)
if len(oldcells) > 0: g.putcells(oldcells)
xstr, ystr = mousepos.split()
x = int(xstr)
y = int(ystr)
selrect[0] = x - xoffset
selrect[1] = y - yoffset
if g.getwidth() > 0:
# ensure selrect doesn't move beyond left/right edge of grid
if selrect[0] < gridl:
selrect[0] = gridl
x = selrect[0] + xoffset
elif selrect[0] + selrect[2] - 1 > gridr:
selrect[0] = gridr + 1 - selrect[2]
x = selrect[0] + xoffset
if g.getheight() > 0:
# ensure selrect doesn't move beyond top/bottom edge of grid
if selrect[1] < gridt:
selrect[1] = gridt
y = selrect[1] + yoffset
elif selrect[1] + selrect[3] - 1 > gridb:
selrect[1] = gridb + 1 - selrect[3]
y = selrect[1] + yoffset
g.select(selrect)
oldcells = g.getcells(selrect)
g.putcells(selpatt, x - firstx, y - firsty)
oldmouse = mousepos
g.update()
# ------------------------------------------------------------------------------
selrect = g.getselrect()
if len(selrect) == 0: g.exit("There is no selection.")
selpatt = g.getcells(selrect)
# remember initial selection in case user aborts script
firstrect = g.getselrect()
firstpatt = g.getcells(selrect)
g.show("Click anywhere in selection, move mouse and release button... (hit 'h' for help)")
oldcursor = g.getcursor()
g.setcursor("Move")
oldcells = []
try:
aborted = True
moveselection()
aborted = False
finally:
g.setcursor(oldcursor)
if aborted:
g.clear(0)
if len(oldcells) > 0: g.putcells(oldcells)
g.putcells(firstpatt)
g.select(firstrect)
else:
g.show(" ")
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