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from Tkinter import *
import Pmw
import ColorDB
class LeftArrow:
_ARROWWIDTH = 30
_ARROWHEIGHT = 15
_YOFFSET = 13
_TEXTYOFFSET = 1
_TAG = ('leftarrow',)
def __init__(self, canvas, x):
self._canvas = canvas
self.__arrow, self.__text = self._create(x)
self.move_to(x)
def _create(self, x):
arrow = self._canvas.create_line(
x, self._ARROWHEIGHT + self._YOFFSET,
x, self._YOFFSET,
x + self._ARROWWIDTH, self._YOFFSET,
arrow='first',
width=3.0,
tags=self._TAG)
text = self._canvas.create_text(
x + self._ARROWWIDTH + 13,
self._ARROWHEIGHT - self._TEXTYOFFSET,
tags=self._TAG,
text='128')
return arrow, text
def _x(self):
coords = self._canvas.coords(self._TAG)
assert coords
return coords[0]
def move_to(self, x):
deltax = x - self._x()
self._canvas.move(self._TAG, deltax, 0)
def set_text(self, text):
self._canvas.itemconfigure(self.__text, text=text)
class RightArrow(LeftArrow):
_TAG = ('rightarrow',)
def _create(self, x):
arrow = self._canvas.create_line(
x, self._YOFFSET,
x + self._ARROWWIDTH, self._YOFFSET,
x + self._ARROWWIDTH, self._ARROWHEIGHT + self._YOFFSET,
arrow='last',
width=3.0,
tags=self._TAG)
text = self._canvas.create_text(
x - self._ARROWWIDTH + 15, # TBD: kludge
self._ARROWHEIGHT - self._TEXTYOFFSET,
text='128',
tags=self._TAG)
return arrow, text
def _x(self):
coords = self._canvas.bbox(self._TAG)
assert coords
return coords[2] - 6 # TBD: kludge
class StripWidget(Pmw.MegaWidget):
_CHIPHEIGHT = 50
_CHIPWIDTH = 10
_NUMCHIPS = 40
def __init__(self, parent=None, **kw):
options = (('color', (128, 128, 128), self.__set_color),
('delegate', None, None),
('chipwidth', self._CHIPWIDTH, Pmw.INITOPT),
('chipheight', self._CHIPHEIGHT, Pmw.INITOPT),
('numchips', self._NUMCHIPS, Pmw.INITOPT),
('generator', None, Pmw.INITOPT),
('axis', None, Pmw.INITOPT),
)
self.defineoptions(kw, options)
Pmw.MegaWidget.__init__(self, parent)
interiorarg = (self.interior(),)
# group component contains a convas containing a bunch of objects
# (moveable arrow + text label, relief'd rectangle color chips)
chipwidth = self.__chipwidth = self['chipwidth']
chipheight = self.__chipheight = self['chipheight']
numchips = self.__numchips = self['numchips']
canvaswidth = numchips * (chipwidth + 1)
canvasheight = chipheight + 35
self.__canvas = Canvas(
parent,
width=canvaswidth,
height=canvasheight)
self.__canvas.pack()
# create the color strip
chips = self.__chips = []
x = 1
y = 30
for c in range(self.__numchips):
rect = self.__canvas.create_rectangle(
x, y, x+chipwidth, y+chipheight,
fill='grey', outline='grey')
x = x + chipwidth + 1 # for outline
chips.append(rect)
# create the arrow and text item
chipx = self.__arrow_x(0)
self.__leftarrow = LeftArrow(self.__canvas, chipx)
chipx = self.__arrow_x(len(chips) - 1)
self.__rightarrow = RightArrow(self.__canvas, chipx)
self.__generator = self['generator']
self.__axis = self['axis']
assert self.__axis in (0, 1, 2)
self.initialiseoptions(StripWidget)
def __set_color(self):
rgbtuple = self['color']
red, green, blue = rgbtuple
if self.__generator:
i = 0
chip = 0
for t in self.__generator(self.__numchips, rgbtuple):
rrggbb = ColorDB.triplet_to_rrggbb(t)
self.__canvas.itemconfigure(self.__chips[i],
fill=rrggbb,
outline=rrggbb)
tred, tgreen, tblue = t
if tred <= red and tgreen <= green and tblue <= blue:
chip = i
i = i + 1
# get the arrow's text
coloraxis = rgbtuple[self.__axis]
text = repr(coloraxis)
# move the arrow, and set it's text
if coloraxis <= 128:
# use the left chip
self.__leftarrow.set_text(text)
self.__leftarrow.move_to(self.__arrow_x(chip))
self.__rightarrow.move_to(-100)
else:
# use the right chip
self.__rightarrow.set_text(text)
self.__rightarrow.move_to(self.__arrow_x(chip))
self.__leftarrow.move_to(-100)
# and set the chip's outline
pmwrgb = ColorDB.triplet_to_pmwrgb(rgbtuple)
b = Pmw.Color.rgb2brightness(pmwrgb)
if b <= 0.5:
outline = 'white'
else:
outline = 'black'
self.__canvas.itemconfigure(self.__chips[chip],
outline=outline)
def __arrow_x(self, chipnum):
coords = self.__canvas.coords(self.__chips[chipnum])
assert coords
x0, y0, x1, y1 = coords
return (x1 + x0) / 2.0
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