Class: Cosmos::StlReader

Inherits:
Object show all
Defined in:
lib/cosmos/gui/opengl/stl_reader.rb

Constant Summary collapse

@@files = 
{}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ StlReader

Returns a new instance of StlReader.



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 23

def initialize
  @triangles = []
  @file = nil
  @is_ascii = nil
  @packet = nil
  @num_facets = nil
  @use_cache = true
end

Instance Attribute Details

#triangles ⇒ Object

Returns the value of attribute triangles.



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 18

def triangles
  @triangles
end

#use_cache ⇒ Object

Returns the value of attribute use_cache.



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 19

def use_cache
  @use_cache
end

Instance Method Details

#build_triangles(filename, scaling_factor = 1.0) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 32

def build_triangles(filename, scaling_factor = 1.0)
  if @@files[filename].nil? or !@use_cache
    @triangles = []
    @is_ascii = File.is_ascii?(filename)
    if @is_ascii
      @file = File.new(filename, 'r')
    else
      @file = File.new(filename, 'rb')
    end
    read_triangles(4000000000, scaling_factor)
    @file.close
    @file = nil
    @@files.delete_if {|key, stl_reader| stl_reader == self}
    @@files[filename] = self
  else
    @triangles = @@files[filename].triangles
  end
end

#draw_triangles ⇒ Object 



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 66

def draw_triangles
  GL.EnableClientState(GL::NORMAL_ARRAY)
  GL.EnableClientState(GL::VERTEX_ARRAY)
  GL.NormalPointer(GL::FLOAT, 0, @normals_packed)
  GL.VertexPointer(3, GL::FLOAT, 0, @vertexes_packed)
  GL.DrawArrays(GL::TRIANGLES, 0, @triangles.length * 3)
  GL.DisableClientState(GL::NORMAL_ARRAY)
  GL.DisableClientState(GL::VERTEX_ARRAY)
end

#estimate_num_triangles(filename) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 112

def estimate_num_triangles(filename)
  @is_ascii = File.is_ascii?(filename)
  stat = File.stat(filename)
  if @is_ascii
    return (stat.size / 268).to_i + 1
  else
    return (stat.size / 50).to_i + 1
  end
end

#prep_vertex_arrays ⇒ Object 



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 51

def prep_vertex_arrays
  @normals = []
  @vertexes = []
  @triangles.each do |triangle|
    @normals.concat(triangle[0])
    @normals.concat(triangle[0])
    @normals.concat(triangle[0])
    @vertexes.concat(triangle[1])
    @vertexes.concat(triangle[2])
    @vertexes.concat(triangle[3])
  end
  @normals_packed = @normals.pack('f*')
  @vertexes_packed = @vertexes.pack('f*')
end

#process(filename, scaling_factor = 1.0) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 76

def process(filename, scaling_factor = 1.0)
  build_triangles(filename, scaling_factor)
  prep_vertex_arrays()
  draw_triangles()
end

#process_with_progress(filename, scaling_factor = 1.0) ⇒ Object 



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 82

def process_with_progress(filename, scaling_factor = 1.0)
  num_read = 0
  if @@files[filename].nil? or !@use_cache
    @is_ascii = File.is_ascii?(filename)
    if @file.nil?
      if @is_ascii
        @file = File.new(filename, 'r')
      else
        @file = File.new(filename, 'rb')
      end
      @triangles = []
    end

    num_read = read_triangles(1000, scaling_factor)
    if num_read == 0
      @file.close
      @file = nil
      prep_vertex_arrays()
      draw_triangles()
      @@files.delete_if {|key, stl_reader| stl_reader == self}
      @@files[filename] = self
    end
  else
    @triangles = @@files[filename].triangles
    prep_vertex_arrays()
    draw_triangles()
  end
  return num_read
end

#reset ⇒ Object 



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# File 'lib/cosmos/gui/opengl/stl_reader.rb', line 122

def reset
  @triangles = []
  GC.start
end