Fix "warning: operation on 'y' may be undefined".

[wxWidgets.git] / wxPython / wx / lib / colourchooser / pycolourslider.py

diff --git a/wxPython/wx/lib/colourchooser/pycolourslider.py b/wxPython/wx/lib/colourchooser/pycolourslider.py
index 1bde78144a905b1d1ee010731dbc7f03059e6032..d1fd8dc62a6eff4e78e8da093768b3990f20ac26 100644 (file)
--- a/wxPython/wx/lib/colourchooser/pycolourslider.py
+++ b/wxPython/wx/lib/colourchooser/pycolourslider.py
@@ -1,8 +1,92 @@
+"""
+PyColourChooser
+Copyright (C) 2002 Michael Gilfix

 
 

-"""Renamer stub: provides a way to drop the wx prefix from wxPython objects."""
+This file is part of PyColourChooser.

 
 

-from wx import _rename
-from wxPython.lib.colourchooser import pycolourslider
-_rename(globals(), pycolourslider.__dict__, modulename='lib.colourchooser.pycolourslider')
-del pycolourslider
-del _rename
+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.GetPixel(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