69 lines
1.8 KiB
Ruby
69 lines
1.8 KiB
Ruby
require "rubella/output/base"
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require 'rmagick'
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module Rubella
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module Output
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# Creates a pixel based graphic as representation of the given storage
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# data using ImageMagick.
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# By the RMagick extention. @data will contain a Magick image for futher
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# handling the data please read the RMagick library documentation:
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# http://www.imagemagick.org/RMagick/doc/
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#
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class Image < Base
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# Constructor
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# Has a default field_size of 15 pixel.
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#
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# @param data Rubella::Storage
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# @param field_size int How many pixel one value has
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# @return Rubella::Output::Image
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#
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def initialize data, field_size = 15
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super data, field_size
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end
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# Creates a pixel based graphic.
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#
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# @return RMagick::Image
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#
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def render
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# image size
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x = @data.length*@field_size # columns x field_size
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y = @data.dataset_length*@field_size # buckets x field_size
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# start drawing the damn thing
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image = Magick::Image.new(x, y) { self.background_color = "lime" }
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i = 0
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@data.each do |point|
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j = 0
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point.reverse.each do |part|
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# draw a red rectangle on the white background
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core = Magick::Draw.new
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intensity = 127.5 * part
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# Fix for float stupidity
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intensity = 127.5 if intensity > 127.5
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# Get the correct value
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l = (255-intensity).round
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# Draw
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core.fill(Magick::Pixel.from_hsla(0, 255, l, 1).to_color)
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core.rectangle((i*@field_size), (j*@field_size), ((i+1)*@field_size), ((j+1)*@field_size))
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core.draw image
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j = j + 1
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end
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i = i + 1
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end
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image
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end
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end
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end
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end
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