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"""Chip viewer and widget.
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In the lower left corner of the main Pynche window, you will see two
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ChipWidgets, one for the selected color and one for the nearest color. The
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selected color is the actual RGB value expressed as an X11 #COLOR name. The
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nearest color is the named color from the X11 database that is closest to the
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selected color in 3D space. There may be other colors equally close, but the
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nearest one is the first one found.
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Clicking on the nearest color chip selects that named color.
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The ChipViewer class includes the entire lower left quandrant; i.e. both the
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selected and nearest ChipWidgets.
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"""
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from tkinter import *
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import ColorDB
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class ChipWidget:
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_WIDTH = 150
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_HEIGHT = 80
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def __init__(self,
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master = None,
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width = _WIDTH,
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height = _HEIGHT,
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text = 'Color',
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initialcolor = 'blue',
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presscmd = None,
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releasecmd = None):
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# create the text label
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self.__label = Label(master, text=text)
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self.__label.grid(row=0, column=0)
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# create the color chip, implemented as a frame
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self.__chip = Frame(master, relief=RAISED, borderwidth=2,
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width=width,
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height=height,
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background=initialcolor)
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self.__chip.grid(row=1, column=0)
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# create the color name
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self.__namevar = StringVar()
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self.__namevar.set(initialcolor)
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self.__name = Entry(master, textvariable=self.__namevar,
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relief=FLAT, justify=CENTER, state=DISABLED,
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font=self.__label['font'])
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self.__name.grid(row=2, column=0)
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# create the message area
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self.__msgvar = StringVar()
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self.__name = Entry(master, textvariable=self.__msgvar,
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relief=FLAT, justify=CENTER, state=DISABLED,
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font=self.__label['font'])
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self.__name.grid(row=3, column=0)
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# set bindings
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if presscmd:
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self.__chip.bind('<ButtonPress-1>', presscmd)
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if releasecmd:
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self.__chip.bind('<ButtonRelease-1>', releasecmd)
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def set_color(self, color):
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self.__chip.config(background=color)
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def get_color(self):
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return self.__chip['background']
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def set_name(self, colorname):
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self.__namevar.set(colorname)
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def set_message(self, message):
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self.__msgvar.set(message)
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def press(self):
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self.__chip.configure(relief=SUNKEN)
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def release(self):
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self.__chip.configure(relief=RAISED)
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class ChipViewer:
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def __init__(self, switchboard, master=None):
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self.__sb = switchboard
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self.__frame = Frame(master, relief=RAISED, borderwidth=1)
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self.__frame.grid(row=3, column=0, ipadx=5, sticky='NSEW')
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# create the chip that will display the currently selected color
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# exactly
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self.__sframe = Frame(self.__frame)
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self.__sframe.grid(row=0, column=0)
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self.__selected = ChipWidget(self.__sframe, text='Selected')
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# create the chip that will display the nearest real X11 color
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# database color name
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self.__nframe = Frame(self.__frame)
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self.__nframe.grid(row=0, column=1)
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self.__nearest = ChipWidget(self.__nframe, text='Nearest',
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presscmd = self.__buttonpress,
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releasecmd = self.__buttonrelease)
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def update_yourself(self, red, green, blue):
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# Selected always shows the #rrggbb name of the color, nearest always
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# shows the name of the nearest color in the database. BAW: should
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# an exact match be indicated in some way?
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#
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# Always use the #rrggbb style to actually set the color, since we may
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# not be using X color names (e.g. "web-safe" names)
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colordb = self.__sb.colordb()
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rgbtuple = (red, green, blue)
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rrggbb = ColorDB.triplet_to_rrggbb(rgbtuple)
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# find the nearest
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nearest = colordb.nearest(red, green, blue)
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nearest_tuple = colordb.find_byname(nearest)
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nearest_rrggbb = ColorDB.triplet_to_rrggbb(nearest_tuple)
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self.__selected.set_color(rrggbb)
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self.__nearest.set_color(nearest_rrggbb)
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# set the name and messages areas
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self.__selected.set_name(rrggbb)
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if rrggbb == nearest_rrggbb:
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self.__selected.set_message(nearest)
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else:
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self.__selected.set_message('')
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self.__nearest.set_name(nearest_rrggbb)
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self.__nearest.set_message(nearest)
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def __buttonpress(self, event=None):
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self.__nearest.press()
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def __buttonrelease(self, event=None):
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self.__nearest.release()
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rrggbb = self.__nearest.get_color()
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red, green, blue = ColorDB.rrggbb_to_triplet(rrggbb)
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self.__sb.update_views(red, green, blue)
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