Module: ColorPalette

Included in:
Graph
Defined in:
lib/color_palette.rb

Instance Method Summary collapse

Instance Method Details

#create_color_gradient_palette(r1, g1, b1, r2, g2, b2, shades) ⇒ Object

Create a color palette shading from one color to another This function will fill the color palette with 10 shades between the two RGB colors 0,0,0 and 100,100,100.This will produce grey shades. (Palette id 0-9 will be filled)



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# File 'lib/color_palette.rb', line 12

def create_color_gradient_palette(r1,g1,b1,r2,g2,b2,shades)
  r_factor = (r2-r1)/shades
  g_factor = (g2-g1)/shades
  b_factor = (b2-b1)/shades
  i= 0
  while(i<= shades-1)
    set_palette(i, r1+r_factor*i, g1+g_factor*i, b1+b_factor*i)
    i = i+1
  end
end

#load_color_palette(color_palette) ⇒ Object

Load palette from array [[r,g,b],]



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# File 'lib/color_palette.rb', line 40

def load_color_palette(color_palette)
  color_id = 0
  color_palette.each do |palette|
    if palette.length == 3
      set_palette(
          color_id, palette[0].to_i, palette[1].to_i, palette[2].to_i)
      color_id+=1
    end
  end
end

#load_color_palette_from_file(file_name) ⇒ Object

This function will load the color scheme from a text file. This file must be formatted with three values per line ( r,g,b ). By default the delimiter is a coma but you can specify it.



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# File 'lib/color_palette.rb', line 26

def load_color_palette_from_file(file_name)
  color_id = 0
  File.open(file_name,"r") do |infile|
    while (line = infile.gets)
      values = line.split(",")
      if ( values.length == 3 )
        set_palette(color_id, values[0].to_i, values[1].to_i, values[2].to_i)
        color_id+=1
      end
    end
  end
end

#set_color_palette(id, r, g, b) ⇒ Object

This function can be used to change the color of one series. series id are starting at 0 for associated data serie #1. You must provide an rgb color.



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# File 'lib/color_palette.rb', line 5

def set_color_palette(id,r,g,b)
  b,g,r=validate_color(b, g, r)
  set_palette(id, r, g, b)
end