Class: Tile

Inherits:
Object
  • Object
show all
Defined in:
lib/tile.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(col, row, zoom, cov_zoom) ⇒ Tile

Returns a new instance of Tile.



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# File 'lib/tile.rb', line 6

def initialize(col, row, zoom, cov_zoom)
  @col = col
  @row = row
  @zoom = zoom
  if File.exist?(path)
    load_image
  else
    DownloadManager.enqueue(self)
  end
  create_coverage(cov_zoom)
end

Instance Attribute Details

#col ⇒ Object (readonly)

Returns the value of attribute col.



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# File 'lib/tile.rb', line 4

def col
  @col
end

#row ⇒ Object (readonly)

Returns the value of attribute row.



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# File 'lib/tile.rb', line 4

def row
  @row
end

#zoom ⇒ Object (readonly)

Returns the value of attribute zoom.



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# File 'lib/tile.rb', line 4

def zoom
  @zoom
end

Instance Method Details

#create_coverage(cov_zoom) ⇒ Object 



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# File 'lib/tile.rb', line 18

def create_coverage(cov_zoom)
  if !cov_zoom
    @mask = nil
  else
    @mask = Wx::Bitmap.new(TILE_WIDTH, TILE_WIDTH)
    @mask.draw do |dc| 
      dc.pen = Wx::TRANSPARENT_PEN
      dc.brush = Wx::WHITE_BRUSH
      dc.draw_rectangle(0, 0, TILE_WIDTH, TILE_WIDTH)
      draw_subtiles(dc, cov_zoom)
    end
  end
end

#draw(dc, x, y) ⇒ Object 



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# File 'lib/tile.rb', line 37

def draw(dc, x, y)
  dc.pen = Wx::TRANSPARENT_PEN
  dc.logical_function = Wx::COPY
  if @bitmap
    dc.draw_bitmap(@bitmap, x, y, false)
  else
    dc.brush = Wx::GREY_BRUSH
    dc.draw_rectangle(x, y, TILE_WIDTH, TILE_WIDTH)
  end
  if @mask
    dc.logical_function = Wx::AND
    dc.draw_bitmap(@mask, x, y, false)
  end
end

#load_image ⇒ Object 



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# File 'lib/tile.rb', line 32

def load_image
  image = Wx::Image.new(path, Wx::BITMAP_TYPE_PNG)
  @bitmap = Wx::Bitmap.from_image(image)
end

#path ⇒ Object 



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# File 'lib/tile.rb', line 58

def path
  "maps/GoogleMap_#{zoom}/#{col}_#{row}.mgm"
end

#url ⇒ Object 



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# File 'lib/tile.rb', line 52

def url
  server = (@col + 2 * @row) % 4
  galileo = "Galileo"[0, (3 * @col + @row) % 8]
  "http://mt#{server}.google.com/vt/lyrs=m@115&hl=en&x=#{@col}&y=#{@row}&z=#{@zoom}&s=#{galileo}"
end