Class: Treemap::GradientColor

Inherits:
ColorBase show all
Defined in:
lib/treemap/gradient_color.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from ColorBase

#blue, #green, #red, #to_html, #to_rgb

Constructor Details

#initialize {|_self| ... } ⇒ GradientColor

Returns a new instance of GradientColor.

Yields:

  • (_self)

Yield Parameters:



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# File 'lib/treemap/gradient_color.rb', line 18

def initialize
    @min = -100
    @max = 100
    @min_color = "FF0000"   # red
    @mean_color = "000000"  # black
    @max_color = "00FF00"   # green
    @increment = 1

    yield self if block_given?

    # XXX add in error checking. if min >= max, if colors aren't hex, etc.
    @min = @min.to_f
    @max = @max.to_f
    @mean = (@min + @max) / 2.to_f
    @slices = (1.to_f / @increment.to_f) * (@max - @mean).to_f
end

Instance Attribute Details

#increment ⇒ Object

Returns the value of attribute increment.



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# File 'lib/treemap/gradient_color.rb', line 16

def increment
  @increment
end

#max ⇒ Object

Returns the value of attribute max.



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# File 'lib/treemap/gradient_color.rb', line 16

def max
  @max
end

#max_color ⇒ Object

Returns the value of attribute max_color.



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# File 'lib/treemap/gradient_color.rb', line 16

def max_color
  @max_color
end

#mean_color ⇒ Object

Returns the value of attribute mean_color.



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# File 'lib/treemap/gradient_color.rb', line 16

def mean_color
  @mean_color
end

#min ⇒ Object

Returns the value of attribute min.



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# File 'lib/treemap/gradient_color.rb', line 16

def min
  @min
end

#min_color ⇒ Object

Returns the value of attribute min_color.



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# File 'lib/treemap/gradient_color.rb', line 16

def min_color
  @min_color
end

Instance Method Details

#get_hex_color(value) ⇒ Object 



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# File 'lib/treemap/gradient_color.rb', line 35

def get_hex_color(value)
    value = @max if(value > @max)
    vaue = @min if(value < @min)


    r1, g1, b1 = to_rgb(@mean_color)
    r2, g2, b2 = to_rgb(@min_color)
    if(value >= @mean) 
        r2, g2, b2 = to_rgb(@max_color)
    end

    rfactor = ((r1 -r2).abs.to_f / @slices) * value.abs 
    gfactor = ((g1 -g2).abs.to_f / @slices) * value.abs
    bfactor = ((b1 -b2).abs.to_f / @slices) * value.abs

    newr = r1 + rfactor
    if(r1 > r2)
        newr = r1 - rfactor
    end

    newg = g1 + gfactor
    if(g1 > g2)
        newg = g1 - gfactor
    end

    newb = b1 + bfactor
    if(b1 > b2)
        newb = b1 - bfactor
    end

    sprintf("%02X", newr.round) + sprintf("%02X", newg.round) + sprintf("%02X", newb.round)
end

#get_rgb_color(value) ⇒ Object 



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# File 'lib/treemap/gradient_color.rb', line 68

def get_rgb_color(value)
    to_rgb(get_hex_color(value))
end