Demo code for Google Sketchup - pghrb resentation

sketchup.rb

# Sketchup & Ruby
#
# Pittsburgh.rb Presentation
# 7/1/10

# Draw rectangle

model = Sketchup.active_model
entities = model.entities
model.selection.add entities.to_a.last

# Making shapes

entities.add_face([0,0,0], [0,1,0], [0,1,1])

50.times do
  triangle = Array.new(3)
  triangle.fill { Array.new(3) {rand(50)} }
  entities.add_face(triangle)
end

#Setting styles

faces = entities.select { |e| e.is_a? Sketchup::Face }
faces.each do |face|
  face.back_material = face.material = Array.new(3) { rand() }
end

#pushpull

def make_box(width, depth, height)
  group = Sketchup.active_model.entities.add_group
  entities = group.entities
  
  points = []
  points[0] = [0, 0, 0]
  points[1] = [width, 0, 0]
  points[2] = [width, depth, 0]
  points[3] = [0, depth, 0]
  
  base = entities.add_face points
  
  base.pushpull height
  
  return group
end

#Transforms

def make_staircase
  width = 25
  depth = 100
  height = 10
  stair_count = 5
  
  stair_count.times do |n|
    box = make_box(width, depth, height)
    rotate = Geom::Transformation.rotation(ORIGIN, Z_AXIS, (Math::PI/12) * n)
    translate = Geom::Transformation.translation([0, 0, height*n])
    box.entities.transform_entities rotate*translate, box
  end
end

# Prompts

def make_staircase
  width = 25
  depth = 100
  height = 10
  
  prompts = ["# Stairs"]
  defaults = [15]
  results = inputbox prompts, defaults, "Staircase dimensions"
  
  return if not results
  
  stair_count = results[0]
  
  stair_count.times do |n|
    box = make_box(width, depth, height)
    rotate = Geom::Transformation.rotation(ORIGIN, Z_AXIS, -(Math::PI/12) * n)
    translate = Geom::Transformation.translation([0, 0, height*n])
    box.entities.transform_entities rotate*translate, box
  end
end