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Contents
# frozen_string_literal: true
#
# Gruff::Bezier is a special line graph that have
# the bezier curve.
#
# Here's how to set up a Gruff::Bezier.
#
# dataset = [
# +0.00, +0.09, +0.19, +0.29, +0.38, +0.47, +0.56, +0.64, +0.71, +0.78,
# +0.84, +0.89, +0.93, +0.96, +0.98, +0.99, +0.99, +0.99, +0.97, +0.94,
# +0.90, +0.86, +0.80, +0.74, +0.67, +0.59, +0.51, +0.42, +0.33, +0.23,
# +0.14, +0.04, -0.06, -0.16, -0.26, -0.36, -0.45, -0.53, -0.62, -0.69,
# -0.76, -0.82, -0.88, -0.92, -0.96, -0.98, -1.00, -1.00, -1.00, -0.99,
# -0.96, -0.93, -0.89, -0.84, -0.78, -0.71, -0.64, -0.56, -0.47, -0.38,
# ]
# g = Gruff::Bezier.new
# g.data 'sin', dataset
# g.write('bezier.png')
#
class Gruff::Bezier < Gruff::Base
private
def draw_graph
x_increment = (@graph_width / (column_count - 1)).to_f
renderer_class = RUBY_PLATFORM == 'java' ? Gruff::Renderer::Polyline : Gruff::Renderer::Bezier
stroke_width = clip_value_if_greater_than(@columns / (store.norm_data.first[1].size * 4.0), 5.0)
store.norm_data.each do |data_row|
next if data_row[1].empty?
poly_points = []
data_row[1].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))
if index == 0 && RUBY_PLATFORM != 'java'
poly_points << new_x
poly_points << new_y
end
poly_points << new_x
poly_points << new_y
draw_label(new_x, index)
end
renderer_class.new(renderer, color: data_row.color, width: stroke_width).render(poly_points)
end
end
end
Version data entries
12 entries across 12 versions & 1 rubygems