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import string
from Tkinter import *
import Pmw
import ColorDB
# Load this script into the Tcl interpreter and call it in
# StripWidget.set_color(). This is about as fast as it can be with the
# current _tkinter.c interface, which doesn't support Tcl Objects.
TCLPROC = '''\
proc setcolor {canv colors} {
set i 1
foreach c $colors {
$canv itemconfigure $i -fill $c -outline $c
incr i
}
}
'''
# Tcl event types
BTNDOWN = 4
BTNUP = 5
BTNDRAG = 6
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):
self.__lastchip = None
options = (('color', (128, 128, 128), self.__set_color),
('delegate', None, self.__set_delegate),
('chipwidth', self._CHIPWIDTH, Pmw.INITOPT),
('chipheight', self._CHIPHEIGHT, Pmw.INITOPT),
('numchips', self._NUMCHIPS, Pmw.INITOPT),
('generator', None, Pmw.INITOPT),
('axis', None, Pmw.INITOPT),
('label', '', 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 + 43 # TBD: Kludge
# create the canvas and pack it
canvas = self.__canvas = Canvas(
parent,
width=canvaswidth,
height=canvasheight,
## borderwidth=2,
## relief=GROOVE
)
canvas.pack()
canvas.bind('<ButtonPress-1>', self.__select_chip)
canvas.bind('<ButtonRelease-1>', self.__select_chip)
canvas.bind('<B1-Motion>', self.__select_chip)
# Load a proc into the Tcl interpreter. This is used in the
# set_color() method to speed up setting the chip colors.
canvas.tk.eval(TCLPROC)
# create the color strip
chips = self.__chips = []
x = 1
y = 30
tags = ('chip',)
for c in range(self.__numchips):
color = 'grey'
rect = canvas.create_rectangle(
x, y, x+chipwidth, y+chipheight,
fill=color, outline=color,
tags=tags)
x = x + chipwidth + 1 # for outline
chips.append(color)
# create the string tag
self.__label = canvas.create_text(
3, y + chipheight + 8,
text=self['label'],
anchor=W)
# create the arrow and text item
chipx = self.__arrow_x(0)
self.__leftarrow = LeftArrow(canvas, chipx)
chipx = self.__arrow_x(len(chips) - 1)
self.__rightarrow = RightArrow(canvas, chipx)
self.__generator = self['generator']
self.__axis = self['axis']
assert self.__axis in (0, 1, 2)
self.initialiseoptions(StripWidget)
self.__delegate = self['delegate']
self.__update_while_dragging = 1
def __set_color(self):
rgbtuple = self['color']
self.set_color(self, rgbtuple)
def __arrow_x(self, chipnum):
coords = self.__canvas.coords(chipnum+1)
assert coords
x0, y0, x1, y1 = coords
return (x1 + x0) / 2.0
def __select_chip(self, event=None):
if self.__delegate:
x = event.x
y = event.y
canvas = self.__canvas
chip = canvas.find_overlapping(x, y, x, y)
if chip and (1 <= chip[0] <= self.__numchips):
color = self.__chips[chip[0]-1]
rgbtuple = ColorDB.rrggbb_to_triplet(color)
etype = int(event.type)
if (etype == BTNUP or self.__update_while_dragging):
# update everyone
self.__delegate.set_color(self, rgbtuple)
else:
# just track the arrows
self.__trackarrow(chip[0], rgbtuple)
def __set_delegate(self):
self.__delegate = self['delegate']
def __trackarrow(self, chip, rgbtuple):
# invert the last chip
if self.__lastchip is not None:
color = self.__canvas.itemcget(self.__lastchip, 'fill')
self.__canvas.itemconfigure(self.__lastchip, outline=color)
self.__lastchip = chip
# 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-1))
self.__rightarrow.move_to(-100)
else:
# use the right chip
self.__rightarrow.set_text(text)
self.__rightarrow.move_to(self.__arrow_x(chip-1))
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(chip, outline=outline)
#
# public interface
#
def set_color(self, obj, rgbtuple):
red, green, blue = rgbtuple
assert self.__generator
i = 1
chip = 0
chips = self.__chips = []
tclcmd = []
tk = self.__canvas.tk
for t in self.__generator(self.__numchips, rgbtuple):
rrggbb = ColorDB.triplet_to_rrggbb(t)
chips.append(rrggbb)
tred, tgreen, tblue = t
if tred <= red and tgreen <= green and tblue <= blue:
chip = i
i = i + 1
# call the raw tcl script
colors = string.join(chips)
tk.eval('setcolor %s {%s}' % (self.__canvas._w, colors))
# move the arrows around
self.__trackarrow(chip, rgbtuple)
def set_update_while_dragging(self, flag):
self.__update_while_dragging = flag
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