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require File.dirname(__FILE__) + '/base'
# EXPERIMENTAL!
#
# Doesn't work yet.
#
class Gruff::PhotoBar < Gruff::Base
# TODO
#
# define base and cap in yml
# allow for image directory to be located elsewhere
# more exact measurements for bar heights (go all the way to the bottom of the graph)
# option to tile images instead of use a single image
# drop base label a few px lower so photo bar graphs can have a base dropping over the lower marker line
#
# The name of a pre-packaged photo-based theme.
attr_reader :theme
# def initialize(target_width=800)
# super
# init_photo_bar_graphics()
# end
def draw
super
return unless @has_data
return # TODO Remove for further development
init_photo_bar_graphics()
#Draw#define_clip_path()
#Draw#clip_path(pathname)
#Draw#composite....with bar graph image OverCompositeOp
#
# See also
#
# Draw.pattern # define an image to tile as the filling of a draw object
#
# Setup spacing.
#
# Columns sit side-by-side.
spacing_factor = 0.9
@bar_width = @norm_data[0][DATA_COLOR_INDEX].columns
@norm_data.each_with_index do |data_row, row_index|
data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index|
data_point = 0 if data_point.nil?
# Use incremented x and scaled y
left_x = @graph_left + (@bar_width * (row_index + point_index + ((@data.length - 1) * point_index)))
left_y = @graph_top + (@graph_height - data_point * @graph_height) + 1
right_x = left_x + @bar_width * spacing_factor
right_y = @graph_top + @graph_height - 1
bar_image_width = data_row[DATA_COLOR_INDEX].columns
bar_image_height = right_y.to_f - left_y.to_f
# Crop to scale for data
bar_image = data_row[DATA_COLOR_INDEX].crop(0, 0, bar_image_width, bar_image_height)
@d.gravity = NorthWestGravity
@d = @d.composite(left_x, left_y, bar_image_width, bar_image_height, bar_image)
# Calculate center based on bar_width and current row
label_center = @graph_left + (@data.length * @bar_width * point_index) + (@data.length * @bar_width / 2.0)
draw_label(label_center, point_index)
end
end
@d.draw(@base_image)
end
# Return the chosen theme or the default
def theme
@theme || 'plastik'
end
protected
# Sets up colors with a list of images that will be used.
# Images should be 340px tall
def init_photo_bar_graphics
color_list = Array.new
theme_dir = File.dirname(__FILE__) + '/../../assets/' + theme
Dir.open(theme_dir).each do |file|
next unless /\.png$/.match(file)
color_list << Image.read("#{theme_dir}/#{file}").first
end
@colors = color_list
end
end
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