gem 'autocad', '~> 0.5'

# Start AutoCAD and create a new drawing
Autocad.run do |app|
  drawing = app.new_drawing("test.dwg")
  
  # Create a new layer with a color
  layer = drawing.create_layer("MyLayer", ACAD::COLOR::RED)
  
  # Switch to model space
  drawing.to_model_space
  
  # Add a line to the drawing
  model = drawing.model_space
  pt1 = Point3d(0, 0, 0)
  pt2 = Point3d(10, 10, 0)
  line = model.add_line(pt1, pt2)
  
  # Save and close the drawing
  drawing.save
  drawing.close
end

# Colors can be specified in multiple ways:
layer.color = Autocad::Color::Blue    # Using constants
layer.color = :green                  # Using symbols
layer.color = "RED"                   # Using strings
layer.color = 1                       # Using AutoCAD color indices

# Create a layer
layer = drawing.create_layer("NewLayer", :blue)

# Set the active layer
drawing.active_layer = layer

# Iterate through all layers
drawing.layers.each do |layer|
  puts "Layer: #{layer.name}, Color: #{layer.color_name}"
end

# Create a selection set
ss = drawing.create_selection_set("MySelection")

# Filter for specific objects
ss.filter do |f|
  f.and(f.model_space, f.block_reference)
end

# Select objects
ss.select

# Process selected objects
ss.each do |obj|
  puts obj.inspect
end

# Export the current drawing to PDF
drawing.save_as_pdf(dir: "output")

# Batch convert multiple drawings
Autocad.with_drawings(["drawing1.dwg", "drawing2.dwg"], read_only: true) do |drawing|
  drawing.save_as_pdf(dir: "output")
end