Use Process.clock_time instead of Time.now

Author: monkstone

contributed/tree.rb

@@ -2,6 +2,8 @@
 # frozen_string_literal: true
 require 'propane'
 
+TIME_FORMAT = 'Time after this iteration: %.2f'
+
 class Tree < Propane::App
   # http://processing.org/learning/topics/tree.html
   # by Joe Holt
@@ -16,12 +18,12 @@ def setup
     frame_rate 30
     @x = 0.0
     @dx = width / 100
-    @start_time = Time.now
+    @start_time = Process.clock_gettime(Process::CLOCK_MONOTONIC)
     @frame_time = nil
   end
 
   def draw
-    t = Time.now
+    t = Process.clock_gettime(Process::CLOCK_MONOTONIC)
     if @frame_time
       fps = 1.0 / (t - @frame_time)
       # printf "%0.1f fps\n", fps
@@ -46,7 +48,7 @@ def draw
 
     @x += @dx
     if @x < 0
-      puts "Time after this iteration: " + (Time.now - @start_time).to_s
+      puts format(TIME_FORMAT, t - @start_time)
     end
     if @x > width || @x < 0
       @dx = - @dx

external_library/java/pixel_flow/sampling_poisson2d.rb

@@ -37,11 +37,11 @@ def newInstance(x, y, r, rcollision)
     rmax = 25
     roff = 0.5
     new_points = 100
-    start = Time.now
+    start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
     pds.setRandomSeed(rand(0..10_0000))
     pds.generatePoissonSampling2D(bounds, rmin, rmax, roff, new_points)
     @samples = pds.samples
-    time = Time.now - start
+    time = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
     puts("poisson samples 2D generated")
     puts("    time: #{(time * 1000).floor}ms")
     puts("    count: #{samples.size}")

external_library/java/pixel_flow/sampling_poisson3d.rb

@@ -57,21 +57,21 @@ def newInstance(x, y, z, r, rcollision)
     rmax = 50
     roff = 1
     new_points = 50
-    start = Time.now
+    start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
     pds.generatePoissonSampling(bounds, rmin, rmax, roff, new_points)
     @shp_samples_spheres = create_shape(GROUP)
     @shp_samples_points  = create_shape(GROUP)
     @samples = pds.samples
     samples.each do |sample|
       add_shape(sample)
     end
-    time = Time.now - start
-    start = Time.now
+    time = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
+    start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
     puts("poisson samples 3D generated")
     puts("    time: #{(time * 1_000).floor}ms")
     puts("    count: #{pds.samples.size}")
 
-    time = Time.now - start
+    time = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
     puts("PShapes created")
     puts("    time: #{(time * 1_000).floor}ms")
     puts("    count: #{samples.size}")

processing_app/library/vecmath/vec2d/circle_collision.rb

@@ -42,7 +42,7 @@ def setup
   end
 
   def draw
-    t = Time.now
+    t = Process.clock_gettime(Process::CLOCK_MONOTONIC)
     fps = 1.0 / (t - @frame_time) if @frame_time
     @frame_time = t
     @frame_count += 1

processing_app/topics/filters/video_filtering/barrel_blur_chroma.rb

@@ -7,7 +7,6 @@ class BarrelBlurChroma < Propane::App
   include_package 'processing.video'
 
   attr_reader :movie, :my_shader
-
   # How much barrel effect do we want?
   # Values between 0.5 and 3.0 work best, but feel free to try other values
   BARREL = 2.2

processing_app/topics/filters/video_filtering/droste.rb

@@ -16,20 +16,19 @@ def settings
 
   def setup
     sketch_title 'Droste'
-    @origin = Time.now
+    @origin = Process.clock_gettime(Process::CLOCK_MONOTONIC)
     @my_filter = load_shader(data_path('droste.glsl'))
     my_filter.set('sketchSize', width.to_f, height.to_f)
     start_capture(width, height)
   end
 
   def time
-    (Time.now - origin) * 0.5
+    (Process.clock_gettime(Process::CLOCK_MONOTONIC) - origin) * 0.5
   end
 
   def draw
     # Draw the image on the scene
     image(cam, 0, 0)
-
     my_filter.set('globalTime', time)
     # Applies the shader to everything that has already been drawn
     return if mouse_pressed?

processing_app/topics/ruby_hook/subclass.rb

@@ -39,7 +39,6 @@ def update
   def post_initialize(_args)
     nil
   end
-
 end
 
 class SpinArm < Spin # inherit from (or "extend") class Spin
@@ -76,5 +75,4 @@ def display
   end
 end
 
-
 SubClassSketch.new

processing_app/topics/shaders/infinite_tiling.rb

@@ -1,3 +1,4 @@
+#!/usr/bin/env jruby
 require 'propane'
 #-------------------------------------------------------------
 # Display endless moving background using a tile texture.
@@ -15,7 +16,7 @@ def setup
     texture_wrap(REPEAT)
     @tile_texture = load_image(data_path('penrose.jpg'))
     load_tile_shader
-    @time0 = Time.now
+    @time0 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
   end
 
   def load_tile_shader
@@ -25,7 +26,7 @@ def load_tile_shader
   end
 
   def draw
-    mil = (Time.now - time0).to_f
+    mil = Process.clock_gettime(Process::CLOCK_MONOTONIC) - time0
     tile_shader.set('time', mil)
     shader(tile_shader)
     rect(0, 0, width, height)