keyEvent example

Author: monkstone

processing_app/library/library_proxy/key_event.rb

@@ -0,0 +1,36 @@
+#!/usr/bin/env jruby
+# A simple demonstration of vanilla processing 'reflection' methods using
+# propane :library_proxy.
+# See library/my_library/my_library.rb code for the guts.
+require 'propane'
+
+class KeyEventDemo < Propane::App
+  load_libraries :library_proxy, :my_library
+
+  attr_reader :visible
+
+  def settings
+    size 300, 200
+    @visible = false
+  end
+
+  def setup
+    sketch_title 'KeyEvent Demo'
+    MyLibrary.new self
+  end
+
+  def hide(val) # we call this method from my_library
+    @visible = !val
+  end
+
+  def draw
+    if visible
+      fill(0, 0, 200)
+      ellipse(170, 115, 70, 100)
+    else
+      background 0
+    end
+  end
+end
+
+KeyEventDemo .new

processing_app/library/library_proxy/library/my_library/my_library.rb

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+# This class demonstrates how by inheriting from the abstract class CustomProxy
+# we can access 'keyEvent' and 'draw'  (Note we need a draw method even
+# though can be empty)
+class MyLibrary < LibraryProxy
+
+  attr_reader :app
+
+  def initialize(parent)
+    @app = parent
+  end
+
+  def draw # optional
+    fill app.color(200, 0, 0, 100) # partially transparent
+    app.rect 100, 100, 60, 90
+  end
+
+  # favor guard clause no_op unless key pressed
+  # and no_op unless ascii key else we can't use :chr
+  def keyEvent(e) # NB: need camel case for reflection to work
+    return unless e.get_action == KeyEvent::PRESS
+    return if e.get_key >= 'z'.ord
+    case e.get_key.chr.upcase
+    when 'S'
+      app.send :hide, false
+    when 'H'
+      app.send :hide, true
+    else
+      puts e.get_key.chr
+    end
+  end
+end