Module: NSWTopo::WorldFile

Extended by:
WorldFile
Included in:
WorldFile
Defined in:
lib/nswtopo/gis/world_file.rb

Instance Method Summary collapse

Instance Method Details

#geotransform(top_left, resolution, angle) ⇒ Object 



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# File 'lib/nswtopo/gis/world_file.rb', line 5

def geotransform(top_left, resolution, angle)
  sin, cos = Math::sin(angle * Math::PI / 180.0), Math::cos(angle * Math::PI / 180.0)
  [[top_left[0], resolution * cos,  resolution * sin],
   [top_left[1], resolution * sin, -resolution * cos]]
end

#write(top_left, resolution, angle, path) ⇒ Object 



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# File 'lib/nswtopo/gis/world_file.rb', line 11

def write(top_left, resolution, angle, path)
  (x, r00, r01), (y, r10, r11) = geotransform(top_left, resolution, angle)
  path.open("w") do |file|
    file.puts r00, r01, r10, r11
    file.puts x + 0.5 * resolution, y - 0.5 * resolution
  end
end