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StripViewer.py
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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()
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