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"""
Some useful colour-realted utility functions
"""
import wx
# Used on OSX to get access to carbon api constants
if wx.Platform == '__WXMAC__':
import Carbon.Appearance
def AdjustAlpha(colour, alpha):
"""Adjust the alpha of a given colour"""
return wx.Colour(colour.Red(), colour.Green(), colour.Blue(), alpha)
def AdjustColour(color, percent, alpha=wx.ALPHA_OPAQUE):
""" Brighten/Darken input colour by percent and adjust alpha
channel if needed. Returns the modified color.
@param color: color object to adjust
@type color: wx.Color
@param percent: percent to adjust +(brighten) or -(darken)
@type percent: int
@keyword alpha: amount to adjust alpha channel
"""
radj, gadj, badj = [ int(val * (abs(percent) / 100.))
for val in color.Get() ]
if percent < 0:
radj, gadj, badj = [ val * -1 for val in [radj, gadj, badj] ]
else:
radj, gadj, badj = [ val or 255 for val in [radj, gadj, badj] ]
red = min(color.Red() + radj, 255)
green = min(color.Green() + gadj, 255)
blue = min(color.Blue() + badj, 255)
return wx.Colour(red, green, blue, alpha)
def BestLabelColour(color, bw=False):
"""Get the best color to use for the label that will be drawn on
top of the given color.
@param color: background color that text will be drawn on
@param bw: If True, only return black or white
"""
avg = sum(color.Get()) / 3
if avg > 192:
txt_color = wx.BLACK
elif avg > 128:
if bw: txt_color = wx.BLACK
else: txt_color = AdjustColour(color, -95)
elif avg < 64:
txt_color = wx.WHITE
else:
if bw: txt_color = wx.WHITE
else: txt_color = AdjustColour(color, 95)
return txt_color
def GetHighlightColour():
"""Get the default highlight color
@return: wx.Color
"""
if wx.Platform == '__WXMAC__':
brush = wx.Brush(wx.BLACK)
# kThemeBrushButtonPressedLightHighlight
brush.MacSetTheme(Carbon.Appearance.kThemeBrushFocusHighlight)
return brush.GetColour()
else:
return wx.SystemSettings.GetColour(wx.SYS_COLOUR_HIGHLIGHT)
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