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---
layout: post
title: "LibraryProxy"
keywords: processing, abstract class, library
---
The purpose of the `LibraryProxy` class is to provide access to [processing reflection][library] methods:-
In the sketch we must `load_library :library_proxy` then our ruby library class can inherit from `LibraryProxy` as below, but it must implement all the abstract methods, even if method is empty
```ruby
class MyClass < LibraryProxy
# access to pre, draw, etc
end
```
Example sketch:-
```ruby
#!/usr/bin/env jruby
require 'picrate'
require_relative 'register_send'
class LibraryProxySketch < Processing::App
# A simple demonstration of vanilla processing 'reflection' methods using
# propane :library_proxy. See my_library.rb code for the guts.
load_library :library_proxy
require_relative 'my_library'
def settings
size 300, 200
end
def setup
sketch_title 'Reflection Voodoo Proxy'
MyLibrary.new self
no_loop
end
def draw
fill(0, 0, 200)
ellipse(170, 115, 70, 100)
end
end
LibraryProxySketch.new
```
my_library.rb
```ruby
# This class demonstrates how by inheriting from the abstract class LibraryProxy
# we can access 'pre', 'draw' and 'post' (Note we need a post method even
# though it is empty)
class MyLibrary < LibraryProxy
attr_reader :app
def initialize(parent)
@app = parent
end
def pre
background(100)
end
def draw
app.fill(200, 100)
app.ellipse(150, 100, 200, 60)
end
def post # required but empty method is fine
end
end
```
[library]:https://github.com/processing/processing/wiki/Library-Basics
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34 entries across 34 versions & 1 rubygems