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244 lines
6.3 KiB
Python
244 lines
6.3 KiB
Python
import string
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from Tkinter import *
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import Pmw
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import ColorDB
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# Load this script into the Tcl interpreter and call it in
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# StripWidget.set_color(). This is about as fast as it can be with the
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# current _tkinter.c interface, which doesn't support Tcl Objects.
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TCLPROC = '''\
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proc setcolor {canv colors} {
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set i 1
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foreach c $colors {
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$canv itemconfigure $i -fill $c -outline $c
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incr i
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}
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}
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'''
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class LeftArrow:
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_ARROWWIDTH = 30
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_ARROWHEIGHT = 15
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_YOFFSET = 13
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_TEXTYOFFSET = 1
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_TAG = ('leftarrow',)
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def __init__(self, canvas, x):
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self._canvas = canvas
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self.__arrow, self.__text = self._create(x)
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self.move_to(x)
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def _create(self, x):
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arrow = self._canvas.create_line(
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x, self._ARROWHEIGHT + self._YOFFSET,
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x, self._YOFFSET,
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x + self._ARROWWIDTH, self._YOFFSET,
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arrow='first',
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width=3.0,
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tags=self._TAG)
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text = self._canvas.create_text(
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x + self._ARROWWIDTH + 13,
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self._ARROWHEIGHT - self._TEXTYOFFSET,
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tags=self._TAG,
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text='128')
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return arrow, text
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def _x(self):
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coords = self._canvas.coords(self._TAG)
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assert coords
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return coords[0]
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def move_to(self, x):
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deltax = x - self._x()
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self._canvas.move(self._TAG, deltax, 0)
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def set_text(self, text):
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self._canvas.itemconfigure(self.__text, text=text)
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class RightArrow(LeftArrow):
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_TAG = ('rightarrow',)
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def _create(self, x):
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arrow = self._canvas.create_line(
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x, self._YOFFSET,
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x + self._ARROWWIDTH, self._YOFFSET,
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x + self._ARROWWIDTH, self._ARROWHEIGHT + self._YOFFSET,
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arrow='last',
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width=3.0,
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tags=self._TAG)
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text = self._canvas.create_text(
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x - self._ARROWWIDTH + 15, # TBD: kludge
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self._ARROWHEIGHT - self._TEXTYOFFSET,
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text='128',
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tags=self._TAG)
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return arrow, text
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def _x(self):
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coords = self._canvas.bbox(self._TAG)
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assert coords
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return coords[2] - 6 # TBD: kludge
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class StripWidget(Pmw.MegaWidget):
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_CHIPHEIGHT = 50
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_CHIPWIDTH = 10
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_NUMCHIPS = 40
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def __init__(self, parent=None, **kw):
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options = (('color', (128, 128, 128), self.__set_color),
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('delegate', None, self.__set_delegate),
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('chipwidth', self._CHIPWIDTH, Pmw.INITOPT),
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('chipheight', self._CHIPHEIGHT, Pmw.INITOPT),
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('numchips', self._NUMCHIPS, Pmw.INITOPT),
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('generator', None, Pmw.INITOPT),
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('axis', None, Pmw.INITOPT),
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('label', '', Pmw.INITOPT),
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)
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self.defineoptions(kw, options)
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Pmw.MegaWidget.__init__(self, parent)
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interiorarg = (self.interior(),)
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# group component contains a convas containing a bunch of objects
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# (moveable arrow + text label, relief'd rectangle color chips)
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chipwidth = self.__chipwidth = self['chipwidth']
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chipheight = self.__chipheight = self['chipheight']
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numchips = self.__numchips = self['numchips']
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canvaswidth = numchips * (chipwidth + 1)
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canvasheight = chipheight + 43 # TBD: Kludge
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# create the canvas and pack it
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canvas = self.__canvas = Canvas(
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parent,
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width=canvaswidth,
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height=canvasheight,
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## borderwidth=2,
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## relief=GROOVE
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)
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canvas.pack()
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canvas.bind('<ButtonRelease-1>', self.__select_chip)
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canvas.bind('<B1-Motion>', self.__drag_select_chip)
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# Load a proc into the Tcl interpreter. This is used in the
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# set_color() method to speed up setting the chip colors.
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canvas.tk.eval(TCLPROC)
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# create the color strip
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chips = self.__chips = []
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x = 1
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y = 30
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tags = ('chip',)
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for c in range(self.__numchips):
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color = 'grey'
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rect = canvas.create_rectangle(
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x, y, x+chipwidth, y+chipheight,
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fill=color, outline=color,
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tags=tags)
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x = x + chipwidth + 1 # for outline
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chips.append(color)
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# create the string tag
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self.__label = canvas.create_text(
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3, y + chipheight + 8,
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text=self['label'],
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anchor=W)
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# create the arrow and text item
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chipx = self.__arrow_x(0)
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self.__leftarrow = LeftArrow(canvas, chipx)
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chipx = self.__arrow_x(len(chips) - 1)
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self.__rightarrow = RightArrow(canvas, chipx)
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self.__generator = self['generator']
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self.__axis = self['axis']
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assert self.__axis in (0, 1, 2)
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self.initialiseoptions(StripWidget)
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self.__delegate = self['delegate']
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self.__update_while_dragging = 1
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def __set_color(self):
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rgbtuple = self['color']
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self.set_color(self, rgbtuple)
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def __arrow_x(self, chipnum):
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coords = self.__canvas.coords(chipnum+1)
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assert coords
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x0, y0, x1, y1 = coords
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return (x1 + x0) / 2.0
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def __select_chip(self, event=None):
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if self.__delegate:
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x = event.x
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y = event.y
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canvas = self.__canvas
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chip = canvas.find_overlapping(x, y, x, y)
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if chip and (1 <= chip[0] <= self.__numchips):
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color = self.__chips[chip[0]-1]
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rgbtuple = ColorDB.rrggbb_to_triplet(color)
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self.__delegate.set_color(self, rgbtuple)
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def __drag_select_chip(self, event=None):
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if self.__update_while_dragging:
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self.__select_chip(event)
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def __set_delegate(self):
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self.__delegate = self['delegate']
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#
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# public interface
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#
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def set_color(self, obj, rgbtuple):
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red, green, blue = rgbtuple
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assert self.__generator
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i = 1
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chip = 0
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chips = self.__chips = []
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tclcmd = []
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tk = self.__canvas.tk
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for t in self.__generator(self.__numchips, rgbtuple):
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rrggbb = ColorDB.triplet_to_rrggbb(t)
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chips.append(rrggbb)
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tred, tgreen, tblue = t
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if tred <= red and tgreen <= green and tblue <= blue:
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chip = i
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i = i + 1
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# call the raw tcl script
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colors = string.join(chips)
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tk.eval('setcolor %s {%s}' % (self.__canvas._w, colors))
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# get the arrow's text
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coloraxis = rgbtuple[self.__axis]
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text = repr(coloraxis)
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# move the arrow, and set it's text
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if coloraxis <= 128:
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# use the left chip
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self.__leftarrow.set_text(text)
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self.__leftarrow.move_to(self.__arrow_x(chip-1))
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self.__rightarrow.move_to(-100)
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else:
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# use the right chip
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self.__rightarrow.set_text(text)
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self.__rightarrow.move_to(self.__arrow_x(chip-1))
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self.__leftarrow.move_to(-100)
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# and set the chip's outline
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pmwrgb = ColorDB.triplet_to_pmwrgb(rgbtuple)
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b = Pmw.Color.rgb2brightness(pmwrgb)
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if b <= 0.5:
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outline = 'white'
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else:
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outline = 'black'
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self.__canvas.itemconfigure(chip, outline=outline)
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def set_update_while_dragging(self, flag):
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self.__update_while_dragging = flag
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