141 lines
3.3 KiB
Ruby
141 lines
3.3 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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return enum_for(:points) unless block_given?
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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" && point
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point.altitude = reader.read_string.to_f
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elsif reader.name == "time" && point
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point.timestamp = Time.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" && point && 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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# TODO: create animated gif
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# https://github.com/openstreetmap/openstreetmap-website/issues/281
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image = GD2::Image::IndexedColor.new(width, height)
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black = image.palette.allocate(GD2::Color[0, 0, 0])
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white = image.palette.allocate(GD2::Color[255, 255, 255])
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image.draw do |pen|
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pen.color = white
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pen.rectangle(0, 0, width, height, true)
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end
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image.draw do |pen|
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pen.color = black
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pen.anti_aliasing = true
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pen.dont_blend = false
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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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pen.line(px, py, oldpx, oldpy) 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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end
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image.gif
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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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image = GD2::Image::IndexedColor.new(width, height)
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black = image.palette.allocate(GD2::Color[0, 0, 0])
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white = image.palette.allocate(GD2::Color[255, 255, 255])
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image.draw do |pen|
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pen.color = white
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pen.rectangle(0, 0, width, height, true)
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end
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image.draw do |pen|
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pen.color = black
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pen.anti_aliasing = true
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pen.dont_blend = false
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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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pen.line(px, py, oldpx, oldpy) 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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end
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image.gif
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end
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end
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TrkPt = Struct.new(:segment, :latitude, :longitude, :altitude, :timestamp) do
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def valid?
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latitude && longitude && timestamp &&
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latitude >= -90 && latitude <= 90 &&
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longitude >= -180 && longitude <= 180
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end
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end
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end
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