pdf and svg library examples

Author: monkstone

external_library/gem/ruby_wordcram/data/letters.svg

@@ -28,7 +28,7 @@ def setup
   end
 
   def settings
-    size(700, 700, PDF, 'usconst.pdf')
+    size(700, 700, PDF, data_path('usconst.pdf'))
   end
 end
 RenderToPDF.new

external_library/gem/ruby_wordcram/render_to_pdf.rb

@@ -1,8 +1,7 @@
 #!/usr/bin/env jruby
 require 'propane'
 require 'ruby_wordcram'
-# US Constitution text from http://www.usconstitution.net/const.txt
-# Liberation Serif font from RedHat: https://www.redhat.com/promo/fonts/
+
 WEB = %w(#0033ff #0055ff #0088ff #00bbff #00ffdd).freeze
 LETTERS = ('A'..'Z').to_a
 

external_library/gem/ruby_wordcram/render_to_svg.rb

@@ -6,6 +6,8 @@
 class ForD < Propane::App
   attr_reader :half_w, :half_h, :radius, :spin_x, :spin, :coords
 
+  PHI = ((1.0 + Math.sqrt(5)) / 2.0 - 1) * TWO_PI # Fibonacci distribution
+
   def settings
     size(480, 480, P3D)
   end
@@ -21,11 +23,9 @@ def setup
     @radius = height * 0.4
     @spin_x = 0.0
     @spin = 0.0
-
-    angle = ((1.0 + Math.sqrt(5)) / 2.0 - 1) * TWO_PI # Fibonacci distribution
     @coords = (0..2_000).map do |i|
       inc = Math.asin(i / 1_000.0 - 1.0) # inclination
-      az = angle * i # azimuth
+      az = PHI * i # azimuth
       # Too lazy to do this the right way... precalculating both the angles and the coordinates
       Coord.new.tap do |coord|
         push_matrix

processing_app/basics/math/noise4_tap.rb

@@ -0,0 +1,28 @@
+#!/usr/bin/env jruby
+require 'propane'
+# After a sketch by Marc Edwards at Bjango
+# https:#github.com/bjango/Processing-SVG-experiments
+class CircleRectangle < Propane::App
+  load_library :svg
+
+  def settings
+    size(250, 250)                        # Set up a 250×250 canvas.
+  end
+
+  def setup
+    sketch_title 'Simple Example'
+    begin_record(SVG, data_path('simple.svg')) # Start recording drawing operations to this file.
+    no_loop                                   # Only run draw once.
+  end
+
+  def draw
+    no_stroke                      # Turn off the border on objects we’re about to draw.
+    fill(color('#4bbcf6'))          # Set the fill colour to light blue.
+    rect(50, 50, 100, 100)         # Draw a rectangle on the canvas and to the SVG file.
+    fill(color('#5721a5'))         # Set the fill colour to purple.
+    ellipse(150, 150, 100, 100)    # Draw a circle on the canvas and to the SVG file.
+    end_record                     # Save and close the SVG file recording.
+  end
+end
+
+CircleRectangle.new

processing_app/library/pdf/data/pdf_complex_out.pdf

@@ -0,0 +1,23 @@
+#!/usr/bin/env jruby
+require 'propane'
+
+class SVGExample < Propane::App
+  load_library :svg
+
+
+
+def settings
+  size(400, 400, SVG, data_path('filename.svg'))
+end
+
+def draw
+  # Draw something good here
+  line(0, 0, width/2, height)
+
+  # Exit the program
+  puts 'Finished.'
+  exit
+end
+end
+
+SVGExample.new

processing_app/library/svg/circle_and_rectangles.rb

@@ -0,0 +1,26 @@
+#!/usr/bin/env jruby
+require 'propane'
+
+class SVGDisplay < Propane::App
+  load_library :svg
+
+  def settings
+    size(400, 400)
+  end
+
+  def setup
+    sketch_title 'Display First'
+    no_loop
+    begin_record(SVG, data_path('filename.svg'))
+  end
+
+  def draw
+    # Draw something good here
+    background 0, 0, 200
+    fill 200, 0, 0
+    ellipse(width / 2, height / 2, width * 0.9, height * 0.5)
+    end_record
+  end
+end
+
+SVGDisplay.new

processing_app/library/svg/direct.rb

@@ -0,0 +1,55 @@
+#!/usr/bin/env jruby
+require 'propane'
+# After a sketch by Marc Edwards at Bjango
+# https://github.com/bjango/Processing-SVG-experiments
+class SunflowerPattern < Propane::App
+  load_library :svg
+
+  STEPS = 50.0
+  WEB = %w(#191030 #5ee4ff #764aed).freeze
+
+  attr_reader :distance, :angle, :palette
+
+  def setup
+    sketch_title 'Sunflower Pattern'
+    @palette = web_to_color_array(WEB)
+    begin_record(SVG, data_path('output.svg'))
+    no_stroke
+    no_loop
+  end
+
+  def draw
+    background(palette[0])
+    grid(STEPS, STEPS) do |i, j|
+      @angle = j / STEPS * TAU + (i % 2 * TAU / STEPS / 2)
+      @distance = ease_sine(i / STEPS) * 180
+      fill(
+        lerp_color(
+          color(palette[1]),
+          color(palette[2]),
+          ease_steps(i / STEPS, 2 + rand(10))
+        )
+      )
+      circle(
+        width / 2 + (cos(angle) * distance),
+        height / 2 + (sin(angle) * distance),
+        1 + ease_sine(i / STEPS) * 8
+      )
+    end
+    end_record
+  end
+
+  def ease_sine(t)
+    1 + sin(PI / 2 * t - PI / 2)
+  end
+
+  def ease_steps(t, pow)
+    t**pow
+  end
+
+  def settings
+    size(400,400)
+  end
+end
+
+SunflowerPattern.new