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Author: monkstone

README.md

@@ -1,5 +1,5 @@
 # propane-examples
-Example Sketches for propane-2.6.0+ features replacement of `$app` with `Propane.app`, and additional hemesh examples.
+Example Sketches for propane-2.6.4+ features replacement of `$app` with `Propane.app`, and additional hemesh examples.
 See also [Example-Sketches][examples] for JRubyArt (many of with only need to be class wrapped to run with propane).
 
 WIP to complete translation from JRubyArt to propane using [this conversion tool][conversion], and by replacing `Processing::Proxy` with `Propane::Proxy`, and unnest some classes as required.

contributed/Rakefile

@@ -22,7 +22,7 @@ end
 
 def run_sample(sample_name)
   puts "Running #{sample_name}...quit to run next sample"
-  open("|jruby #{sample_name}", 'r') do |io|
+  open("|jruby --dev #{sample_name}", 'r') do |io|
     while l = io.gets
       puts(l.chop)
     end

contributed/chladni.rb

@@ -0,0 +1,77 @@
+#!/usr/bin/env jruby
+# frozen_string_literal: true
+require 'propane'
+
+# Chladni plate interference surfaces
+# —
+# Based on :
+# http://paulbourke.net/geometry/chladni/
+#
+# —
+# Developed on:
+#   - Processing 2.1.1 on MacOSX (10.9.2)
+# Julien Gachadoat aka v3ga
+# www.v3ga.net
+# www.2roqs.com
+#
+# Translated and tested on:
+#   - propane
+# Martin Prout
+
+class Chladni <Propane::App
+
+  attr_reader :m, :n, :epsilon, :recompute
+
+  def settings
+    size(500, 500, P2D)
+  end
+
+  def setup
+    sketch_title 'Chladni'
+    @epsilon = 0.05
+    @recompute = true
+    @m = 10
+    @n = 2
+  end
+
+  def draw
+    return unless recompute
+    @recompute = false
+    background(255)
+    load_pixels
+    grid(width, height) do |x, y|
+      chladni = cos(n * PI * x / width) * cos(m * PI * y / width) - cos(m * PI * x / width) * cos(n * PI * y / width)
+      pixels[x + y * width] = 0 if chladni.abs <= epsilon
+    end
+    update_pixels
+    format_string = "m= %d n = %d \nepsilon= %0.3f"
+    infos = format(format_string, m, n, epsilon)
+    fill(255, 0, 0)
+    text(infos, 4, 16)
+  end
+
+  def key_pressed
+    case key
+    when '+'
+      @epsilon += 0.01
+    when '-'
+      @epsilon -= 0.01
+    when CODED
+      case key_code
+      when UP
+        @m += 1
+      when DOWN
+        @m -= 1
+      when LEFT
+        @n -= 1
+      when RIGHT
+        @n += 1
+      end
+    end
+    @recompute = true
+    @m = constrain(m, 1, 20)
+    @n = constrain(n, 1, 20)
+  end
+end
+
+Chladni.new