require ''wx''
# col_sample4.rb
BLACK = Wx::Colour.new(0,0,0)
RED = Wx::Colour.new(128,0,0)
@background_colour = BLACK
@symbol_colour = BLACK
temp_colour = BLACK
temp2_colour = RED
@symbol_colour = Wx::Colour.set(1, 0, 0)
puts "@background_colour : #{@background_colour}"
puts "@symbol_colour : #{@symbol_colour}"
puts "temp_colour : #{temp_colour}"
puts "temp2_colour : #{temp2_colour}"
=begin
Hypothetical Values:
@background_colour : #<Wx::Colour: (0, 0, 0 *255)>
@symbol_colour : #<Wx::Colour: (1, 0, 0 *255)>
temp_colour : #<Wx::Colour: (0, 0, 0 *255)>
temp2_colour : #<Wx::Colour: (128, 0, 0 *255)>
Actual Values:
@background_colour : #<Wx::Colour: (1, 0, 0 *255)>
@symbol_colour : #<Wx::Colour: (1, 0, 0 *255)>
temp_colour : #<Wx::Colour: (1, 0, 0 *255)>
temp2_colour : #<Wx::Colour: (128, 0, 0 *255)>
What''s going on here and how do I correct this problem?
=end
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The fix: @symbol_colour = Wx::Colour.new(1, 0, 0) instead of @symbol_colour.set(1, 0, 0) works but it doesn''t it waste resources? Does someone have a better soloution? Thanks. On Fri, Dec 11, 2009 at 10:01 PM, Philip Stephens <plusgforce at gmail.com>wrote:> require ''wx'' > > # col_sample4.rb > > BLACK = Wx::Colour.new(0,0,0) > RED = Wx::Colour.new(128,0,0) > > @background_colour = BLACK > @symbol_colour = BLACK > temp_colour = BLACK > temp2_colour = RED > > @symbol_colour = Wx::Colour.set(1, 0, 0) > > puts "@background_colour : #{@background_colour}" > puts "@symbol_colour : #{@symbol_colour}" > puts "temp_colour : #{temp_colour}" > puts "temp2_colour : #{temp2_colour}" > > =begin > > Hypothetical Values: > > @background_colour : #<Wx::Colour: (0, 0, 0 *255)> > @symbol_colour : #<Wx::Colour: (1, 0, 0 *255)> > temp_colour : #<Wx::Colour: (0, 0, 0 *255)> > temp2_colour : #<Wx::Colour: (128, 0, 0 *255)> > > Actual Values: > > @background_colour : #<Wx::Colour: (1, 0, 0 *255)> > @symbol_colour : #<Wx::Colour: (1, 0, 0 *255)> > temp_colour : #<Wx::Colour: (1, 0, 0 *255)> > temp2_colour : #<Wx::Colour: (128, 0, 0 *255)> > > What''s going on here and how do I correct this problem? > > =end > >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://rubyforge.org/pipermail/wxruby-users/attachments/20091211/293fc55a/attachment.html>
Hi Philip What''s happening is that you have multiple variables referring to the same object. When you change the object, all references change: Philip Stephens wrote:> # col_sample4.rb > > BLACK = Wx::Colour.new(0,0,0)A new object is created; the constant BLACK refers to this object> @background_colour = BLACKThe instance variable @background_colour now also refers to this same object.> @symbol_colour = BLACKNow so does the variable @symbol_colour> @symbol_colour = Wx::Colour.set(1, 0, 0)Change the colour intensities of the (single) colour object. So all references to it will reflect the change. If you want to create an independent copy of a colour from a colour, use the constructor: my_black = Wx::Colour.new(Wx::BLACK) Wx::BLACK == my_black # true my_black.set(127, 127, 127) Wx::BLACK == my_black # false Don''t worry too much about resource control with colours, they will get cleaned up automatically when they fall out of scope, and they are more light-weight objects than say Pens and Brushes. Sometimes I find it useful to declare a palette as a set of constants in a class. class MyDrawingThing SYMBOL_COLOUR = Wx::Colour.new(127,127,127) HIGHLIGHT_COLOUR = Wx::Colour.new(Wx::RED) etc hth a