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Versions: 8
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Contents
# frozen_string_literal: true
#
# Gruff::Area provides an area graph which displays graphically
# quantitative data.
#
# Here's how to set up a Gruff::Area.
#
# 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')
#
class Gruff::Area < Gruff::Base
# Specifies the filling opacity in area graph. Default is +0.85+.
attr_writer :fill_opacity
# Specifies the stroke width in line around area graph. Default is +2.0+.
attr_writer :stroke_width
def initialize_ivars
super
@sorted_drawing = true
@fill_opacity = 0.85
@stroke_width = 2.0
end
private :initialize_ivars
def draw
super
return unless data_given?
x_increment = @graph_width / (column_count - 1).to_f
store.norm_data.each do |data_row|
poly_points = []
data_row.points.each_with_index do |data_point, index|
# 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(color: data_row.color, width: @stroke_width, opacity: @fill_opacity).render(poly_points)
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems