From: martyntaylor <[email protected]>
---
lib/scruffy/layers.rb | 3 +-
lib/scruffy/layers/multi_area.rb | 119 ++++++++++++++++++++++++++++++++++++++
2 files changed, 121 insertions(+), 1 deletions(-)
create mode 100644 lib/scruffy/layers/multi_area.rb
diff --git a/lib/scruffy/layers.rb b/lib/scruffy/layers.rb
index 88908a9..732d802 100644
--- a/lib/scruffy/layers.rb
+++ b/lib/scruffy/layers.rb
@@ -15,10 +15,11 @@ end
require 'scruffy/layers/base'
require 'scruffy/layers/area'
+require 'scruffy/layers/multi_area'
require 'scruffy/layers/all_smiles'
require 'scruffy/layers/bar'
require 'scruffy/layers/line'
require 'scruffy/layers/average'
require 'scruffy/layers/stacked'
require 'scruffy/layers/pie'
-require 'scruffy/layers/pie_slice'
\ No newline at end of file
+require 'scruffy/layers/pie_slice'
diff --git a/lib/scruffy/layers/multi_area.rb b/lib/scruffy/layers/multi_area.rb
new file mode 100644
index 0000000..10f07e5
--- /dev/null
+++ b/lib/scruffy/layers/multi_area.rb
@@ -0,0 +1,119 @@
+module Scruffy::Layers
+ # ==Scruffy::Layers::MulitArea
+ #
+ # Author:: Martyn Taylor
+ # Date:: July 30th 2010
+ #
+ # Multi Area graph.
+
+ class MultiArea < Base
+
+ attr_accessor :baselines
+ attr_accessor :area_colors
+
+ def initialize(options = {}, &block)
+ super(options)
+ @area_colors = options[:area_colors] ? options[:area_colors] : nil
+ @baselines = options[:baselines] ? options[:baselines] : nil
+ end
+
+ # Render Multi Area graph.
+ def draw(svg, coords, options={})
+ # Check whether to use color from theme, or whether to use user defined
colors from the area_colors array
+ color_count = nil
+ if @area_colors && @area_colors.size > 0
+ area_color = @area_colors[0]
+ color_count = 1
+ else
+ puts "Never Set Area Color"
+ area_color = color
+ end
+
+ # Draw Bottom Level Polygons (Original Coords)
+ draw_poly(svg, coords, area_color, options = {})
+
+ # Draw Lower Area Polygons
+ if @baselines
+ # Get the Color of this Area
+ puts "Drawing Baselines"
+ @baselines.sort! {|x,y| y <=> x }
+ @baselines.each do |baseline|
+ if color_count
+ area_color = area_colors[color_count]
+ color_count = color_count + 1
+ puts area_color.to_s
+ if color_count >= area_colors.size
+ color_count = 0
+ end
+ end
+
+ lower_poly_coords =
create_lower_polygon_coords(translate_number(baseline), coords, options)
+ draw_poly(svg, lower_poly_coords, area_color, options = {})
+ end
+ end
+ end
+
+ private
+ def draw_poly(svg, coords, color, options={})
+ points_value1 = "0,#{height} #{stringify_coords(coords).join(' ')}
#{width},#{height}"
+ svg.polygon(:points => points_value1, :fill => color.to_s, :stroke =>
color.to_s, 'style' => "opacity: #{opacity}")
+ end
+
+ def calculate_intersection(baseline, point1, point2)
+ x1 = point1[0]
+ y1 = point1[1]
+ x2 = point2[0]
+ y2 = point2[1]
+
+ # Check whether baseline intersects with the two point line from these
coords
+ if ((y2 >= baseline) && (y1 <= baseline)) || ((y1 >= baseline) && (y2 <=
baseline))
+ # Calculate point of intersection
+ y = baseline.to_f
+ m = (y2.to_f - y1.to_f) / (x2.to_f - x1.to_f)
+ c = y1.to_f
+
+ x = (y.to_f - c.to_f) / m.to_f
+ return [x + x1, y]
+ elsif (y2 <= baseline) && (y1 <= baseline)
+ return nil
+ else
+ return [x2, y2]
+ end
+ end
+
+
+ def create_lower_polygon_coords(baseline, coords, options={})
+ lower_poly_coords = []
+ if coords[0][1] <= baseline
+ lower_poly_coords << [coords[0][0], baseline]
+ else
+ lower_poly_coords << coords[0]
+ end
+
+ coords.each_index do |index|
+ if index + 1 < coords.size
+ poi = calculate_intersection(baseline, coords[index], coords[index +
1])
+ if poi
+ lower_poly_coords << poi
+ if(coords[index + 1][1] > baseline)
+ lower_poly_coords << coords[index + 1]
+ end
+ end
+ end
+ end
+
+ if coords.last[1] <= baseline
+ lower_poly_coords << [coords.last[0], baseline]
+ else
+ lower_poly_coords << coords.last
+ end
+
+ return lower_poly_coords
+ end
+
+ def translate_number(baseline)
+ relative_percent = ((baseline == min_value) ? 0 : ((baseline.to_f -
min_value.to_f) / (max_value.to_f - min_value.to_f).to_f))
+ return (height.to_f - (height.to_f * relative_percent))
+ end
+ end
+end
\ No newline at end of file
--
1.7.1.1
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