168 lines
3.7 KiB
Ruby
168 lines
3.7 KiB
Ruby
module GPX
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class File
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require "libxml"
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include LibXML
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attr_reader :possible_points
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attr_reader :actual_points
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attr_reader :tracksegs
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def initialize(file)
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@file = file
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end
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def points
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@possible_points = 0
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@actual_points = 0
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@tracksegs = 0
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@file.rewind
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reader = XML::Reader.io(@file)
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point = nil
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while reader.read
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if reader.node_type == XML::Reader::TYPE_ELEMENT
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if reader.name == "trkpt"
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point = TrkPt.new(@tracksegs, reader["lat"].to_f, reader["lon"].to_f)
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@possible_points += 1
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elsif reader.name == "ele" and point
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point.altitude = reader.read_string.to_f
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elsif reader.name == "time" and point
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point.timestamp = DateTime.parse(reader.read_string)
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end
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elsif reader.node_type == XML::Reader::TYPE_END_ELEMENT
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if reader.name == "trkpt" and point and point.valid?
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point.altitude ||= 0
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yield point
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@actual_points += 1
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elsif reader.name == "trkseg"
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@tracksegs += 1
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end
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end
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end
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end
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def picture(min_lat, min_lon, max_lat, max_lon, num_points)
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frames = 10
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width = 250
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height = 250
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proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
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linegc = Magick::Draw.new
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linegc.stroke_linejoin('miter')
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linegc.stroke_width(1)
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linegc.stroke('#BBBBBB')
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linegc.fill('#BBBBBB')
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highlightgc = Magick::Draw.new
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highlightgc.stroke_linejoin('miter')
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highlightgc.stroke_width(3)
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highlightgc.stroke('#000000')
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highlightgc.fill('#000000')
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images = []
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frames.times do
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image = Magick::Image.new(width, height) do |image|
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image.background_color = 'white'
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image.format = 'GIF'
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end
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images << image
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end
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oldpx = 0.0
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oldpy = 0.0
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first = true
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m = 0
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mm = 0
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points do |p|
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px = proj.x(p.longitude)
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py = proj.y(p.latitude)
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if m > 0
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frames.times do |n|
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if n == mm
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gc = highlightgc.dup
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else
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gc = linegc.dup
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end
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gc.line(px, py, oldpx, oldpy)
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gc.draw(images[n])
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end
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end
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m += 1
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if m > num_points.to_f / frames.to_f * (mm+1)
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mm += 1
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end
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oldpy = py
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oldpx = px
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end
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il = Magick::ImageList.new
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images.each do |f|
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il << f
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end
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il.delay = 50
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il.format = 'GIF'
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return il.to_blob
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end
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def icon(min_lat, min_lon, max_lat, max_lon)
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width = 50
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height = 50
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proj = OSM::Mercator.new(min_lat, min_lon, max_lat, max_lon, width, height)
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gc = Magick::Draw.new
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gc.stroke_linejoin('miter')
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gc.stroke_width(1)
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gc.stroke('#000000')
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gc.fill('#000000')
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image = Magick::Image.new(width, height) do |image|
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image.background_color = 'white'
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image.format = 'GIF'
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end
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oldpx = 0.0
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oldpy = 0.0
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first = true
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points do |p|
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px = proj.x(p.longitude)
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py = proj.y(p.latitude)
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gc.dup.line(px, py, oldpx, oldpy).draw(image) unless first
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first = false
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oldpy = py
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oldpx = px
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end
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return image.to_blob
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end
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end
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private
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class TrkPt < Struct.new(:segment, :latitude, :longitude, :altitude, :timestamp)
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def valid?
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self.latitude and self.longitude and self.timestamp and
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self.latitude >= -90 and self.latitude <= 90 and
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self.longitude >= -180 and self.longitude <= 180
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end
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end
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end
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