wxruby users - Dec 2009 - 3 variables change after 1 'set' is called

require ''wx''

# col_sample2.rb
# this sets up the colour constants to be used in this program

BLACK     = Wx::Colour.new(0, 0, 0)
RED         = Wx::Colour.new(128, 0, 0)

class Symbol_Class

=begin
This class will hold the variables and procedure necessary to
change a symbol in a series of steps from a background colour
to a foreground colour.  For example: using black as the
background colour and red as the foreground colour, the symbol
colour will start out as the background colour and become the
foreground colour in 128 steps.
=end

    def initialize
        @background_colour = BLACK
        @symbol_colour = BLACK
        @foreground_colour = RED

        @delta_red = 0.0
        @delta_green = 0.0
        @delta_blue = 0.0

        @float_red = 0.0
        @float_green = 0.0
        @float_blue = 0.0

        @symbol_value = "@"
    end

    def set_symbol(bg_colour, fg_colour)

        if(bg_colour != @background_colour) then
            @background_colour = bg_colour
        end

        if(fg_colour != @foreground_colour) then
            @foreground_colour = fg_colour
        end

        @symbol_colour = @background_colour

        tempBC = @background_colour
        tempFC = @foreground_colour

        compute_delta_colours(tempBC, tempFC)
        update_forward_colours
    end

    def update_forward_colours
=begin
This routine has behaviour which I do not understand.  When
executed the symbol colour changes using the @symbol_colour.set
routine.  Unfortunately, both the background colour and temp
colour change even though only one set command was executed.
=end

        puts "ufc1: @background_colour #{@background_colour}"
        puts "ufc1: @symbol_colour #{@symbol_colour}"

        @float_red = (@float_red + @delta_red)
        @float_green = (@float_green + @delta_green)
        @float_blue = (@float_blue + @delta_blue)

        temp_colour = @background_colour
        puts "ufc2: @background_colour #{@background_colour}"
        puts "ufc2: @symbol_colour #{@symbol_colour}"
        puts "ufc2: temp_colour #{temp_colour}"

      @symbol_colour.set((@float_red + 0.5).to_i,
                                 (@float_green + 0.5).to_i,
                                 (@float_blue + 0.5).to_i)

=begin
Only the symbol_colour should change.  Not the temp_colour nor
the background colour however, all three change as shown in the
''puts'' statements.
=end

        puts "ufc3: temp_colour #{temp_colour}"
        puts "ufc3: @background_colour #{@background_colour}"
        puts "ufc3: @symbol_colour #{@symbol_colour}"

    end

    def compute_delta_colours(start_colour, end_colour)

        @delta_red = (end_colour.red - start_colour.red) / 128.0
        @delta_green = 0.0
        @delta_blue = 0.0

        @float_red = @symbol_colour.red + 0.0
        @float_green = @symbol_colour.green + 0.0
        @float_blue = @symbol_colour.blue + 0.0
    end
end

=begin output from program using ruby1.9
ufc1: @background_colour #<Wx::Colour: (0, 0, 0 *255)>
ufc1: @symbol_colour #<Wx::Colour: (0, 0, 0 *255)>
ufc2: @background_colour #<Wx::Colour: (0, 0, 0 *255)>
ufc2: @symbol_colour #<Wx::Colour: (0, 0, 0 *255)>
ufc2: temp_colour #<Wx::Colour: (0, 0, 0 *255)>
ufc3: temp_colour #<Wx::Colour: (1, 0, 0 *255)>
ufc3: @background_colour #<Wx::Colour: (1, 0, 0 *255)>
ufc3: @symbol_colour #<Wx::Colour: (1, 0, 0 *255)>
=end

class MyApp < Wx::App
    @end_app = 0

    def on_init
        @symbol = Symbol_Class.new
        bg = BLACK
      fg = RED
        @symbol.set_symbol(bg, fg)
    end
end # class

app = MyApp.new
app.main_loop


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