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require File.dirname(__FILE__) + '/base'
##
# Graph with dots and labels along a vertical access
# see: 'Creating More Effective Graphs' by Robbins
class Gruff::Dot < Gruff::Base
def draw
@has_left_labels = true
super
return unless @has_data
# Setup spacing.
#
spacing_factor = 1.0
@items_width = @graph_height / @column_count.to_f
@item_width = @items_width * spacing_factor / @norm_data.size
@d = @d.stroke_opacity 0.0
padding = (@items_width * (1 - spacing_factor)) / 2
@norm_data.each_with_index do |data_row, row_index|
data_row[DATA_VALUES_INDEX].each_with_index do |data_point, point_index|
x_pos = @graph_left + (data_point * @graph_width)
y_pos = @graph_top + (@items_width * point_index) + padding + (@items_width.to_f/2.0).round
if row_index == 0
@d = @d.stroke(@marker_color)
@d = @d.fill(@marker_color)
@d = @d.stroke_width 1.0
@d = @d.stroke_opacity 0.1
@d = @d.fill_opacity 0.1
@d = @d.line(@graph_left, y_pos, @graph_left + @graph_width, y_pos)
@d = @d.fill_opacity 1
end
@d = @d.fill data_row[DATA_COLOR_INDEX]
@d = @d.stroke('transparent')
@d = @d.circle(x_pos, y_pos, x_pos + (@item_width.to_f/3.0).round, y_pos)
draw_label(y_pos, point_index)
end
end
@d.draw(@base_image)
end
protected
# Instead of base class version, draws vertical background lines and label
def draw_line_markers
return if @hide_line_markers
@d = @d.stroke_antialias false
# Draw horizontal line markers and annotate with numbers
@d = @d.stroke(@marker_color)
@d = @d.stroke_width 1
if @y_axis_increment
increment = @y_axis_increment
number_of_lines = (@spread / @y_axis_increment).to_i
else
# Try to use a number of horizontal lines that will come out even.
#
# TODO Do the same for larger numbers...100, 75, 50, 25
if @marker_count.nil?
(3..7).each do |lines|
if @spread % lines == 0.0
@marker_count = lines
break
end
end
@marker_count ||= 5
end
# TODO Round maximum marker value to a round number like 100, 0.1, 0.5, etc.
@increment = (@spread > 0 && @marker_count > 0) ? significant(@spread / @marker_count) : 1
number_of_lines = @marker_count
increment = @increment
end
(0..number_of_lines).each do |index|
marker_label = @minimum_value + index * increment
x = @graph_left + (marker_label - @minimum_value) * @graph_width / @spread
@d = @d.line(x, @graph_bottom, x, @graph_bottom + 0.5 * LABEL_MARGIN)
unless @hide_line_numbers
@d.fill = @font_color
@d.font = @font if @font
@d.stroke = 'transparent'
@d.pointsize = scale_fontsize(@marker_font_size)
@d.gravity = CenterGravity
# TODO Center text over line
@d = @d.annotate_scaled(@base_image,
0, 0, # Width of box to draw text in
x, @graph_bottom + (LABEL_MARGIN * 2.0), # Coordinates of text
label(marker_label, increment), @scale)
end # unless
@d = @d.stroke_antialias true
end
end
##
# Draw on the Y axis instead of the X
def draw_label(y_offset, index)
if !@labels[index].nil? && @labels_seen[index].nil?
@d.fill = @font_color
@d.font = @font if @font
@d.stroke = 'transparent'
@d.font_weight = NormalWeight
@d.pointsize = scale_fontsize(@marker_font_size)
@d.gravity = EastGravity
@d = @d.annotate_scaled(@base_image,
1, 1,
-@graph_left + LABEL_MARGIN * 2.0, y_offset,
@labels[index], @scale)
@labels_seen[index] = 1
end
end
end
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