Contents

#
# Linear Image. 
# 
# Click and drag mouse up and down to control the signal. 
#
# Note in ruby-processing to access booleans use
#       mouse_pressed? and key_pressed?
#
# Press and hold any key to view the image scanning. 
#

attr_reader :signal, :img, :direction

def setup
  size(640, 360)
  stroke(255)
  @img = loadImage("sea.jpg")
  @direction = 1
  @signal = 0
  img.load_pixels
  load_pixels
end

def draw
  if (signal > img.height - 1 || signal < 0)  
    @direction = direction * -1
  end
  if mouse_pressed? 
    @signal = abs(mouse_y % img.height)
  else 
    @signal += (0.3*direction)
  end

  if key_pressed? 
    set(0, 0, img)
    line(0, signal, img.width, signal)
  else 
    signal_offset = signal.to_i * img.width
    (0 ... img.height).each do |y| 
      java.lang.System::arraycopy(img.pixels.to_java, signal_offset, pixels, y*width, img.width)
    end
    update_pixels
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
ruby-processing-2.4.4	samples/processing_app/topics/image_processing/linear_image.rb
ruby-processing-2.4.3	samples/processing_app/topics/image_processing/linear_image.rb
ruby-processing-2.4.2	samples/processing_app/topics/image_processing/linear_image.rb
ruby-processing-2.4.1	samples/processing_app/topics/image_processing/linear_image.rb