"""
PyColourChooser
Copyright (C) 2002 Michael Gilfix
This file is part of PyColourChooser.
You should have received a file COPYING containing license terms
along with this program; if not, write to Michael Gilfix
(mgilfix@eecs.tufts.edu) for a copy.
This version of PyColourChooser is open source; you can redistribute it and/or
modify it under the terms listed in the file COPYING.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
"""
# 12/14/2003 - Jeff Grimmett (grimmtooth@softhome.net)
#
# o 2.5 compatability update.
#
# 12/21/2003 - Jeff Grimmett (grimmtooth@softhome.net)
#
# o wxPyColorChooser -> PyColorChooser
# o wxPyColourChooser -> PyColourChooser
#
import wx
import canvas
import colorsys
class PyColourSlider(canvas.Canvas):
"""A Pure-Python Colour Slider
The colour slider displays transitions from value 0 to value 1 in
HSV, allowing the user to select a colour within the transition
spectrum.
This class is best accompanying by a wxSlider that allows the user
to select a particular colour shade.
"""
HEIGHT = 172
WIDTH = 12
def __init__(self, parent, id, colour=None):
"""Creates a blank slider instance. A colour must be set before the
slider will be filled in."""
# Set the base colour first since our base class calls the buffer
# drawing function
self.SetBaseColour(colour)
canvas.Canvas.__init__(self, parent, id, size=(self.WIDTH, self.HEIGHT))
def SetBaseColour(self, colour):
"""Sets the base, or target colour, to use as the central colour
when calculating colour transitions."""
self.base_colour = colour
def GetBaseColour(self):
"""Return the current colour used as a colour base for filling out
the slider."""
return self.base_colour
def GetValue(self, pos):
"""Returns the colour value for a position on the slider. The position
must be within the valid height of the slider, or results can be
unpredictable."""
return self.buffer.GetPixelColour(0, pos)
def DrawBuffer(self):
"""Actual implementation of the widget's drawing. We simply draw
from value 0.0 to value 1.0 in HSV."""
if self.base_colour is None:
return
target_red = self.base_colour.Red()
target_green = self.base_colour.Green()
target_blue = self.base_colour.Blue()
h,s,v = colorsys.rgb_to_hsv(target_red / 255.0, target_green / 255.0,
target_blue / 255.0)
v = 1.0
vstep = 1.0 / self.HEIGHT
for y_pos in range(0, self.HEIGHT):
r,g,b = [c * 255.0 for c in colorsys.hsv_to_rgb(h,s,v)]
colour = wx.Colour(int(r), int(g), int(b))
self.buffer.SetPen(wx.Pen(colour, 1, wx.SOLID))
self.buffer.DrawRectangle(0, y_pos, 15, 1)
v = v - vstep
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