def _align_label(self, side=None, padx=None, pady=None):
"""Returns x,y of label (for canvas coords()/create(). side is like
in labelconfigure() - N, NW, CENTER... Use args or current label_style,
which is always available (after __init__() with defaults values)
"""
side = self.label_styles["side"] if side is None else side
padx = self.label_styles["padx"] if padx is None else padx
pady = self.label_styles["pady"] if pady is None else pady
bx0, by0, bx1, by1 = self.c.bbox(self.tag)
bx0 += padx
by0 += pady
return tkutils.anchor_coords(bx0, by0, bx1, by1, side)
def place(self, x=None, y=None, relx=None, rely=None,
width=None, height=None, relwidth=None, relheight=None, anchor=CENTER, widthscale=False):
"""Like place in Tk but on canvas
"""
canw = float(self.c.winfo_width())
canh = float(self.c.winfo_height())
if relx is not None:
x = canw * relx
if rely is not None:
y = canh * rely
if relwidth is not None:
width = canw * relwidth
if relheight is not None:
height = canh * relheight
bx0, by0, bx1, by1 = self.c.bbox(self.tag)
# first, change size
if width:
oldw = abs(bx1-bx0) or 1.
self.xscale(factor=width/oldw, axe_point=LEFT, widthscale=widthscale)
if height:
oldh = abs(by1-by0) or 1.
self.yscale(factor=height/oldh, axe_point=TOP, widthscale=widthscale)
# second, move
# Anchor coords: anchor is point inside this bound-box. Moving needs
# shifting by the anchor coords (inside bbox) after usual movement.
ax,ay = tkutils.anchor_coords(0, 0, bx1-bx0, by1-by0, anchor)
if x is not None and x != bx0:
xoff = x - bx0 - ax
else:
xoff = 0
if y is not None and y != by0:
yoff = y - by0 - ay
else:
yoff = 0
#print "[%s] bx0: %d ax: %d xoff: %d canw: %d" % (self.tag, bx0, ax, xoff, canw)
if xoff or yoff:
self.move(xoff, yoff)
def __create_background(self, filename):
"""Create background of scheme
"""
if self._bgcolor:
self.c["bg"] = self._bgcolor
im = Image.open(filename).convert("RGBA")
self._imwidth, self._imheight = im.size
self._cw = self.c.winfo_width()
self._ch = self.c.winfo_height()
if self._bgscale and (self._imwidth > self._cw or self._imheight > self._ch):
# need increasing of image
im = im.resize((min(self._imwidth, self._cw), min(self._imheight, self._ch)))
self._im = ImageTk.PhotoImage(im)
self._im.im = im
x, y = tkutils.anchor_coords(0, 0, self._cw, self._ch, self._bganchor)
self.tag = self.c.create_image(x, y, image=self._im, anchor=self._bganchor)
self.c.tag_lower(self.tag, ALL) # or some symbol tag instead of ALL???
# size of scheme
self.width, self.height = im.size
