Module: Gpx2png::Calculations::OsmInstanceMethods

Included in:
OsmBase
Defined in:
lib/gpx2png/calculations/osm_instance_methods.rb

Constant Summary collapse

TILE_WIDTH = 
OsmClassMethods::TILE_WIDTH
TILE_HEIGHT = 
OsmClassMethods::TILE_WIDTH

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#bitmap_point_x_max ⇒ Object (readonly)

points for cropping



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 13

def bitmap_point_x_max
  @bitmap_point_x_max
end

#bitmap_point_x_min ⇒ Object (readonly)

points for cropping



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 13

def bitmap_point_x_min
  @bitmap_point_x_min
end

#bitmap_point_y_max ⇒ Object (readonly)

points for cropping



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 13

def bitmap_point_y_max
  @bitmap_point_y_max
end

#bitmap_point_y_min ⇒ Object (readonly)

points for cropping



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 13

def bitmap_point_y_min
  @bitmap_point_y_min
end

#lat_max ⇒ Object (readonly)

Returns the value of attribute lat_max.



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 10

def lat_max
  @lat_max
end

#lat_min ⇒ Object (readonly)

Returns the value of attribute lat_min.



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 10

def lat_min
  @lat_min
end

#lon_max ⇒ Object (readonly)

Returns the value of attribute lon_max.



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 10

def lon_max
  @lon_max
end

#lon_min ⇒ Object (readonly)

Returns the value of attribute lon_min.



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 10

def lon_min
  @lon_min
end

#tile_x_distance ⇒ Object (readonly)

Returns the value of attribute tile_x_distance.



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 11

def tile_x_distance
  @tile_x_distance
end

#tile_y_distance ⇒ Object (readonly)

Returns the value of attribute tile_y_distance.



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 11

def tile_y_distance
  @tile_y_distance
end

Instance Method Details

#auto_zoom_for(x = 0, y = 0) ⇒ Object

Calculate zoom level



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 64

def auto_zoom_for(x = 0, y = 0)
  # TODO
end

#calculate_for_crop ⇒ Object

Calculate some numbers for cropping operation



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 69

def calculate_for_crop
  point_min = self.class.point_on_image(@zoom, [@lat_min, @lon_min])
  point_max = self.class.point_on_image(@zoom, [@lat_max, @lon_max])
  @bitmap_point_x_min = (point_min[:osm_title_coord][0] - @tile_x_range.min) * TILE_WIDTH + point_min[:pixel_offset][0]
  @bitmap_point_x_max = (point_max[:osm_title_coord][0] - @tile_x_range.min) * TILE_WIDTH + point_max[:pixel_offset][0]
  @bitmap_point_y_max = (point_min[:osm_title_coord][1] - @tile_y_range.min) * TILE_HEIGHT + point_min[:pixel_offset][1]
  @bitmap_point_y_min = (point_max[:osm_title_coord][1] - @tile_y_range.min) * TILE_HEIGHT + point_max[:pixel_offset][1]

  @r.set_crop(@bitmap_point_x_min, @bitmap_point_x_max, @bitmap_point_y_min, @bitmap_point_y_max)
end

#calculate_for_crop_with_auto_zoom ⇒ Object

Calculate some numbers for cropping operation with autozoom



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 81

def calculate_for_crop_with_auto_zoom
  point_min = self.class.point_on_image(@zoom, [@lat_min, @lon_min])
  point_max = self.class.point_on_image(@zoom, [@lat_max, @lon_max])
  @bitmap_point_x_min = (point_min[:osm_title_coord][0] - @tile_x_range.min) * TILE_WIDTH + point_min[:pixel_offset][0]
  @bitmap_point_x_max = (point_max[:osm_title_coord][0] - @tile_x_range.min) * TILE_WIDTH + point_max[:pixel_offset][0]
  @bitmap_point_y_max = (point_min[:osm_title_coord][1] - @tile_y_range.min) * TILE_HEIGHT + point_min[:pixel_offset][1]
  @bitmap_point_y_min = (point_max[:osm_title_coord][1] - @tile_y_range.min) * TILE_HEIGHT + point_max[:pixel_offset][1]

  bitmap_x_center = (@bitmap_point_x_min + @bitmap_point_x_max) / 2
  bitmap_y_center = (@bitmap_point_y_min + @bitmap_point_y_max) / 2

  @r.set_crop_fixed(bitmap_x_center, bitmap_y_center, @fixed_width, @fixed_height)
end

#download_and_join_tiles ⇒ Object

Do everything



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 100

def download_and_join_tiles
  self.class.logger.info "Output image dimension #{@full_image_x.to_s.red} x #{@full_image_y.to_s.red}"
  @r.new_image

  # {:x, :y, :blob}
  @images = Array.new


  @tile_x_range.each do |x|
    @tile_y_range.each do |y|
      url = self.class.url(@zoom, [x, y])

      # blob time
      unless simulate_download?
        uri = URI.parse(url)
        response = Net::HTTP.get_response(uri)
        blob = response.body
      else
        blob = @r.blank_tile(TILE_WIDTH, TILE_HEIGHT, x+y)
      end

      @r.add_tile(
        blob,
        (x - @tile_x_range.min) * TILE_WIDTH,
        (y - @tile_y_range.min) * TILE_HEIGHT
      )

      @images << {
        url: url,
        x: x,
        y: y
      }

      self.class.logger.info "processed #{(x - @tile_x_range.min).to_s.red} x #{(y - @tile_y_range.min).to_s.red} (max #{(@tile_x_range.max - @tile_x_range.min).to_s.yellow} x #{(@tile_y_range.max - @tile_y_range.min).to_s.yellow})"
    end
  end

  # sweet, image is joined

  # min/max points used for cropping
  @bitmap_point_x_max = (@full_image_x / 2).round
  @bitmap_point_x_min = (@full_image_x / 2).round
  @bitmap_point_y_max = (@full_image_y / 2).round
  @bitmap_point_y_min = (@full_image_y / 2).round

  # add all coords to the map
  _coords_count = 0
  @layers.each do |layer|
    _coords = layer.coords
    _coords_count += _coords.size
    (1..._coords.size).each do |i|

      lat_from = _coords[i-1][:lat]
      lon_from = _coords[i-1][:lon]

      lat_to = _coords[i][:lat]
      lon_to = _coords[i][:lon]

      point_from = self.class.point_on_image(@zoom, [lat_from, lon_from])
      point_to = self.class.point_on_image(@zoom, [lat_to, lon_to])
      # { osm_title_coord: osm_tile_coord, pixel_offset: [x, y] }

      # first point
      bitmap_xa = (point_from[:osm_title_coord][0] - @tile_x_range.min) * TILE_WIDTH + point_from[:pixel_offset][0]
      bitmap_ya = (point_from[:osm_title_coord][1] - @tile_y_range.min) * TILE_HEIGHT + point_from[:pixel_offset][1]
      bitmap_xb = (point_to[:osm_title_coord][0] - @tile_x_range.min) * TILE_WIDTH + point_to[:pixel_offset][0]
      bitmap_yb = (point_to[:osm_title_coord][1] - @tile_y_range.min) * TILE_HEIGHT + point_to[:pixel_offset][1]

      @r.line(
        bitmap_xa, bitmap_ya,
        bitmap_xb, bitmap_yb
      )
    end
  end
  self.class.logger.info "Layers - #{@layers.size.to_s.red} with #{_coords_count.to_s.yellow} coords have been added to image"

  # add points
  @markers.each do |point|
    lat = point[:lat]
    lon = point[:lon]

    p = self.class.point_on_image(@zoom, [lat, lon])
    bitmap_x = (p[:osm_title_coord][0] - @tile_x_range.min) * TILE_WIDTH + p[:pixel_offset][0]
    bitmap_y = (p[:osm_title_coord][1] - @tile_y_range.min) * TILE_HEIGHT + p[:pixel_offset][1]

    point[:x] = bitmap_x
    point[:y] = bitmap_y

    @r.markers << point
  end
  self.class.logger.info "Markers - #{@markers.size.to_s.red} have been added to image"

end

#expand_map ⇒ Object 



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 95

def expand_map
  # TODO expand min and max ranges
end

#initial_calculations ⇒ Object 



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# File 'lib/gpx2png/calculations/osm_instance_methods.rb', line 15

def initial_calculations
  calculate_minmax_latlon

  # auto zoom must be here
  # drawing must fit into fixed resolution
  # map must be bigger than fixed resolution
  if @fixed_width and @fixed_height
    @new_zoom = self.class.calc_zoom(
      @lat_min, @lat_max,
      @lon_min, @lon_max,
      @fixed_width, @fixed_height
    )
    self.class.logger.debug "Calculated new zoom #{@new_zoom.to_s.red} (was #{@zoom.to_s.red})"
    @zoom = @new_zoom
  end

  @border_tiles = [
    self.class.convert(@zoom, [@lat_min, @lon_min]),
    self.class.convert(@zoom, [@lat_max, @lon_max])
  ]

  @tile_x_range = (@border_tiles[0][0])..(@border_tiles[1][0])
  @tile_y_range = (@border_tiles[1][1])..(@border_tiles[0][1])

  # enlarging ranges to fill up map area
  # both sizes are enlarged
  if @fixed_width and @fixed_height
    x_axis_expand_count = ((@fixed_width - (1 + @tile_x_range.max - @tile_x_range.min) * TILE_WIDTH).to_f / (TILE_WIDTH.to_f * 2.0)).ceil
    y_axis_expand_count = ((@fixed_height - (1 + @tile_y_range.max - @tile_y_range.min) * TILE_HEIGHT).to_f / (TILE_HEIGHT.to_f * 2.0)).ceil
    self.class.logger.debug "Expanding #{"X".to_s.blue} tiles from both sides #{x_axis_expand_count.to_s.green}"
    self.class.logger.debug "Expanding #{"Y".to_s.blue} tiles from both sides #{y_axis_expand_count.to_s.green}"
    @tile_x_range = ((@tile_x_range.min - x_axis_expand_count)..(@tile_x_range.max + x_axis_expand_count))
    @tile_y_range = ((@tile_y_range.min - y_axis_expand_count)..(@tile_y_range.max + y_axis_expand_count))
  end

  # new/full image size
  @full_image_x = (1 + @tile_x_range.max - @tile_x_range.min) * TILE_WIDTH
  @full_image_y = (1 + @tile_y_range.max - @tile_y_range.min) * TILE_HEIGHT
  @r.x = @full_image_x
  @r.y = @full_image_y

  if @fixed_width and @fixed_height
    calculate_for_crop_with_auto_zoom
  else
    calculate_for_crop
  end
end