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"""Strip viewer and related widgets.
The classes in this file implement the StripViewer shown in the top two thirds
of the main Pynche window. It consists of three StripWidgets which display
the variations in red, green, and blue respectively of the currently selected
r/g/b color value.
Each StripWidget shows the color variations that are reachable by varying an
axis of the currently selected color. So for example, if the color is
(R,G,B)=(127,163,196)
then the Red variations show colors from (0,163,196) to (255,163,196), the
Green variations show colors from (127,0,196) to (127,255,196), and the Blue
variations show colors from (127,163,0) to (127,163,255).
The selected color is always visible in all three StripWidgets, and in fact
each StripWidget highlights the selected color, and has an arrow pointing to
the selected chip, which includes the value along that particular axis.
Clicking on any chip in any StripWidget selects that color, and updates all
arrows and other windows. By toggling on Update while dragging, Pynche will
select the color under the cursor while you drag it, but be forewarned that
this can be slow.
"""
from Tkinter import *
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
SPACE = ' '
def constant(numchips):
step = 255.0 / (numchips - 1)
start = 0.0
seq = []
while numchips > 0:
seq.append(int(start))
start = start + step
numchips = numchips - 1
return seq
# red variations, green+blue = cyan constant
def constant_red_generator(numchips, red, green, blue):
seq = constant(numchips)
return map(None, [red] * numchips, seq, seq)
# green variations, red+blue = magenta constant
def constant_green_generator(numchips, red, green, blue):
seq = constant(numchips)
return map(None, seq, [green] * numchips, seq)
# blue variations, red+green = yellow constant
def constant_blue_generator(numchips, red, green, blue):
seq = constant(numchips)
return map(None, seq, seq, [blue] * numchips)
# red variations, green+blue = cyan constant
def constant_cyan_generator(numchips, red, green, blue):
seq = constant(numchips)
return map(None, seq, [green] * numchips, [blue] * numchips)
# green variations, red+blue = magenta constant
def constant_magenta_generator(numchips, red, green, blue):
seq = constant(numchips)
return map(None, [red] * numchips, seq, [blue] * numchips)
# blue variations, red+green = yellow constant
def constant_yellow_generator(numchips, red, green, blue):
seq = constant(numchips)
return map(None, [red] * numchips, [green] * numchips, seq)
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, # BAW: kludge
self._ARROWHEIGHT - self._TEXTYOFFSET,
justify=RIGHT,
text='128',
tags=self._TAG)
return arrow, text
def _x(self):
coords = self._canvas.coords(self._TAG)
assert coords
return coords[0] + self._ARROWWIDTH
class StripWidget:
_CHIPHEIGHT = 50
_CHIPWIDTH = 10
_NUMCHIPS = 40
def __init__(self, switchboard,
master = None,
chipwidth = _CHIPWIDTH,
chipheight = _CHIPHEIGHT,
numchips = _NUMCHIPS,
generator = None,
axis = None,
label = '',
uwdvar = None,
hexvar = None):
# instance variables
self.__generator = generator
self.__axis = axis
self.__numchips = numchips
assert self.__axis in (0, 1, 2)
self.__uwd = uwdvar
self.__hexp = hexvar
# the last chip selected
self.__lastchip = None
self.__sb = switchboard
canvaswidth = numchips * (chipwidth + 1)
canvasheight = chipheight + 43 # BAW: Kludge
# create the canvas and pack it
canvas = self.__canvas = Canvas(master,
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'
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 strip label
self.__label = canvas.create_text(
3, y + chipheight + 8,
text=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)
def __arrow_x(self, chipnum):
coords = self.__canvas.coords(chipnum+1)
assert coords
x0, y0, x1, y1 = coords
return (x1 + x0) / 2.0
# Invoked when one of the chips is clicked. This should just tell the
# switchboard to set the color on all the output components
def __select_chip(self, event=None):
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]
red, green, blue = ColorDB.rrggbb_to_triplet(color)
etype = int(event.type)
if (etype == BTNUP or self.__uwd.get()):
# update everyone
self.__sb.update_views(red, green, blue)
else:
# just track the arrows
self.__trackarrow(chip[0], (red, green, blue))
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]
if self.__hexp.get():
# hex
text = hex(coloraxis)
else:
# decimal
text = repr(coloraxis)
# move the arrow, and set its text
if coloraxis <= 128:
# use the left arrow
self.__leftarrow.set_text(text)
self.__leftarrow.move_to(self.__arrow_x(chip-1))
self.__rightarrow.move_to(-100)
else:
# use the right arrow
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
brightness = ColorDB.triplet_to_brightness(rgbtuple)
if brightness <= 128:
outline = 'white'
else:
outline = 'black'
self.__canvas.itemconfigure(chip, outline=outline)
def update_yourself(self, red, green, blue):
assert self.__generator
i = 1
chip = 0
chips = self.__chips = []
tk = self.__canvas.tk
# get the red, green, and blue components for all chips
for t in self.__generator(self.__numchips, red, green, blue):
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 = SPACE.join(chips)
tk.eval('setcolor %s {%s}' % (self.__canvas._w, colors))
# move the arrows around
self.__trackarrow(chip, (red, green, blue))
def set(self, label, generator):
self.__canvas.itemconfigure(self.__label, text=label)
self.__generator = generator
class StripViewer:
def __init__(self, switchboard, master=None):
self.__sb = switchboard
optiondb = switchboard.optiondb()
# create a frame inside the master.
frame = Frame(master, relief=RAISED, borderwidth=1)
frame.grid(row=1, column=0, columnspan=2, sticky='NSEW')
# create the options to be used later
uwd = self.__uwdvar = BooleanVar()
uwd.set(optiondb.get('UPWHILEDRAG', 0))
hexp = self.__hexpvar = BooleanVar()
hexp.set(optiondb.get('HEXSTRIP', 0))
# create the red, green, blue strips inside their own frame
frame1 = Frame(frame)
frame1.pack(expand=YES, fill=BOTH)
self.__reds = StripWidget(switchboard, frame1,
generator=constant_cyan_generator,
axis=0,
label='Red Variations',
uwdvar=uwd, hexvar=hexp)
self.__greens = StripWidget(switchboard, frame1,
generator=constant_magenta_generator,
axis=1,
label='Green Variations',
uwdvar=uwd, hexvar=hexp)
self.__blues = StripWidget(switchboard, frame1,
generator=constant_yellow_generator,
axis=2,
label='Blue Variations',
uwdvar=uwd, hexvar=hexp)
# create a frame to contain the controls
frame2 = Frame(frame)
frame2.pack(expand=YES, fill=BOTH)
frame2.columnconfigure(0, weight=20)
frame2.columnconfigure(2, weight=20)
padx = 8
# create the black button
blackbtn = Button(frame2,
text='Black',
command=self.__toblack)
blackbtn.grid(row=0, column=0, rowspan=2, sticky=W, padx=padx)
# create the controls
uwdbtn = Checkbutton(frame2,
text='Update while dragging',
variable=uwd)
uwdbtn.grid(row=0, column=1, sticky=W)
hexbtn = Checkbutton(frame2,
text='Hexadecimal',
variable=hexp,
command=self.__togglehex)
hexbtn.grid(row=1, column=1, sticky=W)
# XXX: ignore this feature for now; it doesn't work quite right yet
## gentypevar = self.__gentypevar = IntVar()
## self.__variations = Radiobutton(frame,
## text='Variations',
## variable=gentypevar,
## value=0,
## command=self.__togglegentype)
## self.__variations.grid(row=0, column=1, sticky=W)
## self.__constants = Radiobutton(frame,
## text='Constants',
## variable=gentypevar,
## value=1,
## command=self.__togglegentype)
## self.__constants.grid(row=1, column=1, sticky=W)
# create the white button
whitebtn = Button(frame2,
text='White',
command=self.__towhite)
whitebtn.grid(row=0, column=2, rowspan=2, sticky=E, padx=padx)
def update_yourself(self, red, green, blue):
self.__reds.update_yourself(red, green, blue)
self.__greens.update_yourself(red, green, blue)
self.__blues.update_yourself(red, green, blue)
def __togglehex(self, event=None):
red, green, blue = self.__sb.current_rgb()
self.update_yourself(red, green, blue)
## def __togglegentype(self, event=None):
## which = self.__gentypevar.get()
## if which == 0:
## self.__reds.set(label='Red Variations',
## generator=constant_cyan_generator)
## self.__greens.set(label='Green Variations',
## generator=constant_magenta_generator)
## self.__blues.set(label='Blue Variations',
## generator=constant_yellow_generator)
## elif which == 1:
## self.__reds.set(label='Red Constant',
## generator=constant_red_generator)
## self.__greens.set(label='Green Constant',
## generator=constant_green_generator)
## self.__blues.set(label='Blue Constant',
## generator=constant_blue_generator)
## else:
## assert 0
## self.__sb.update_views_current()
def __toblack(self, event=None):
self.__sb.update_views(0, 0, 0)
def __towhite(self, event=None):
self.__sb.update_views(255, 255, 255)
def save_options(self, optiondb):
optiondb['UPWHILEDRAG'] = self.__uwdvar.get()
optiondb['HEXSTRIP'] = self.__hexpvar.get()