class Scruffy::Layers::Bar
Scruffy::Layers::Bar¶ ↑
- Author
-
Brasten Sager
- Date
-
August 6th, 2006
Standard bar graph.
Public Instance Methods
draw(svg, coords, options = {})
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Draw bar graph.
# File lib/scruffy/layers/bar.rb, line 11 def draw(svg, coords, options = {}) coords.each do |coord| x, y, bar_height = (coord.first-(@bar_width * 0.5)), coord.last, (height - coord.last) svg.g(:transform => "translate(-#{relative(0.5)}, -#{relative(0.5)})") { svg.rect( :x => x, :y => y, :width => @bar_width + relative(1), :height => bar_height + relative(1), :style => "fill: black; fill-opacity: 0.15; stroke: none;" ) svg.rect( :x => x+relative(0.5), :y => y+relative(2), :width => @bar_width + relative(1), :height => bar_height - relative(0.5), :style => "fill: black; fill-opacity: 0.15; stroke: none;" ) } svg.rect( :x => x, :y => y, :width => @bar_width, :height => bar_height, :fill => color.to_s, 'style' => "opacity: #{opacity}; stroke: none;" ) end end
Protected Instance Methods
generate_coordinates(options = {})
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Due to the size of the bar graph, X-axis coords must be squeezed so that the bars do not hang off the ends of the graph.
Unfortunately this just mean that bar-graphs and most other graphs end up on different points. Maybe adding a padding to the coordinates should be a graph-wide thing?
# File lib/scruffy/layers/bar.rb, line 37 def generate_coordinates(options = {}) @bar_width = (width / points.size) * 0.9 options[:point_distance] = (width - (width / points.size)) / (points.size - 1).to_f #TODO more array work with index, try to rework to be accepting of hashes coords = (0...points.size).map do |idx| x_coord = (options[:point_distance] * idx) + (width / points.size * 0.5) relative_percent = ((points[idx] == min_value) ? 0 : ((points[idx] - min_value) / (max_value - min_value).to_f)) y_coord = (height - (height * relative_percent)) [x_coord, y_coord] end coords end