Geomerative Solid Text

solid_text.rb

# frozen_string_literal: true

require 'picrate'
require 'geomerative'

# SolidText sketch, rubyists hate explicit get and set methods, using
# JRuby convention to replace them
class SolidText < Processing::App
  attr_reader :em

  def settings
    size(600, 400, P3D)
    smooth
  end

  def setup
    sketch_title 'Solid Text'
    RG.init(self)
    grp = RG.get_text('Depth!', data_path('FreeSans.ttf'), 50, CENTER)
    RG.polygonizer = RCommand::UNIFORMLENGTH
    RG.polygonizer_length = 1
    @em = RExtrudedMesh.new(grp)
  end

  def draw
    background(100)
    lights
    translate(width / 2, height / 2, 200)
    rotate_y(millis / 2000.0)
    fill(255, 100, 0)
    no_stroke
    em.draw
  end
end

SolidText.new

# Custom extrusion class, including Proxy to access App methods
class RExtrudedMesh
  include Processing::Proxy
  attr_reader :mesh, :points_array, :depth

  def initialize(grp, dpth = 10)
    @depth = dpth
    @mesh = grp.to_mesh
    @points_array = grp.points_in_paths
  end

  def draw_face(strips, depth)
    strips.each do |strip|
      begin_shape(TRIANGLE_STRIP)
      strip.vertices.each do |point|
        vertex(point.x, point.y, depth / 2.0)
      end
      end_shape(CLOSE)
    end
 end

  def draw_sides(points_array, depth)
    points_array.each do |points|
      begin_shape(QUAD_STRIP)
      points.each do |point|
        vertex(point.x, point.y, depth / 2.0)
        vertex(point.x, point.y, -depth / 2.0)
      end
      end_shape(CLOSE)
    end
  end

  def draw
    strips = mesh.strips
    draw_face(strips, depth)
    draw_face(strips, depth * -1)
    draw_sides(points_array, depth)
  end
end