class Gruff::Area
Gruff::Area
provides an area graph which displays graphically quantitative data.
Here’s how to set up a Gruff::Area
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g = Gruff::Area.new g.title = 'Area Graph' g.data :Jimmy, [25, 36, 86, 39, 25, 31, 79, 88] g.data :Charles, [80, 54, 67, 54, 68, 70, 90, 95] g.data :Julie, [22, 29, 35, 38, 36, 40, 46, 57] g.write('area.png')
Attributes
Specifies the filling opacity in area graph. Default is 0.85
.
Specifies the stroke width in line around area graph. Default is 2.0
.
Private Instance Methods
Source
# File lib/gruff/area.rb, line 34 def draw_graph x_increment = (@graph_width / (column_count - 1)).to_f store.norm_data.each do |data_row| next if data_row.points.empty? poly_points = [] data_row.points.each_with_index do |data_point, index| data_point = data_point.to_f # Use incremented x and scaled y new_x = @graph_left + (x_increment * index) new_y = @graph_top + (@graph_height - (data_point * @graph_height)) poly_points << new_x poly_points << new_y draw_label(new_x, index) end # Add closing points, draw polygon poly_points << @graph_right poly_points << (@graph_bottom - 1) poly_points << @graph_left poly_points << (@graph_bottom - 1) Gruff::Renderer::Polygon.new(renderer, color: data_row.color, width: @stroke_width, opacity: @fill_opacity).render(poly_points) end end
Source
# File lib/gruff/area.rb, line 27 def initialize_attributes super @sorted_drawing = true @fill_opacity = 0.85 @stroke_width = 2.0 end
Calls superclass method
Gruff::Base#initialize_attributes