Class: Graster

Inherits:
Object
  • Object
show all
Defined in:
lib/graster.rb,
lib/graster/image.rb,
lib/graster/runner.rb,
lib/graster/gcode_file.rb,
lib/graster/gmask_file.rb

Defined Under Namespace

Classes: GcodeFile, GmaskFile, Image, InvalidConfig, Runner

Constant Summary collapse

ROOT2 = 
Math.sqrt(2)
OPTIONS = 
{
  :dpi =>             [[Float],"X,Y","Dots per inch of your device"],
  :on_range =>        [[Float],
    "MIN,MAX","Luminosity range for which the",
    "laser should be on"],
  :overshoot =>       [Float,"INCHES",
    "Distance the X axis should travel",
    "past the outer boundaries of the outer",
    "images. This needs to be wide enough",
    "so that the X axis doesn't start",
    "decelerating until after it has",
    "cleared the image"],
  :offset =>          [[Float],"X,Y",
    "Location for the bottom left corner",
    "of the bottom left tile. The X",
    "component of this setting must be",
    "equal to or greater than overshoot"],
  :repeat =>          [[Integer],"X,Y",
    "Number of times to repeat the image",
    "in the X and Y axes, respectively.",
    "Size of the tile(s) inches. Any nil",
    "value is calculated from the size of",
    "the bitmap"],
  :tile_spacing =>    [[Float],"X,Y",
    "X,Y gap between repeated tiles in",
    "inches"],
  :feed =>            [Float,"N",
    "Speed to move the X axis while",
    "burning, in inches/minute"],
  :cut_feed =>        [Float,"N",
    "Speed at which to cut out tiles"],
  :corner_radius =>   [Float,"N",
    "Radius of rounded corners for",
    "cutout, 0 for pointy corners"]
}
DEFAULTS = 
{
  :dpi => [500,500],                 # X,Y dots per inch of your device
  :on_range =>  [0.0,0.5],           # Luminosity range for which the laser should be on
  :overshoot => 0.5,                 # Distance the X axis should travel past the outer boundaries of the outer images.
                                     # This needs to be wide enough so that the X axis doesn't start decelerating
                                     # until after it has cleared the image.
  :offset => [1.0,1.0],              # X,Y location for the bottom left corner of the bottom left tile.
                                     # The X component of this setting must be equal to or greater than :overshoot.
  :repeat => [1,1],                  # Number of times to repeat the image in the X and Y axes, respectively.
  :tile_size => [false,false],       # Size of the tile(s) inches. Any nil value is calculated from
                                     # the size of the bitmap.
  :tile_spacing => [0.125,0.125],    # X,Y gap between repeated tiles in inches
  :feed => 120,                      # Speed to move the X axis while burning, in inches/minute
  :cut_feed => 20,                   # Speed at which to cut out tiles
  :corner_radius => 0                # Radius of rounded corners for cutout, 0 for pointy corners
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Graster

Returns a new instance of Graster.



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# File 'lib/graster.rb', line 301

def initialize opts={}
  self.config = DEFAULTS.dup
    
  if opts[:config_file]
    self.merge_config load_config_file opts[:config_file]
  elsif opts[:default_config_file] && c = try_load_default_config_file
    self.merge_config c
  end

  self.merge_config opts[:config] if opts[:config]

  @debug = opts[:debug]

  if opts[:image]
    image = opts[:image]
  elsif opts[:image_file]
    load_image_file opts[:image_file]
  end
end

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/graster.rb', line 105

def config
  @config
end

#image ⇒ Object

Returns the value of attribute image.



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# File 'lib/graster.rb', line 116

def image
  @image
end

Instance Method Details

#axis_inches(axis, tile, pixel) ⇒ Object

convert tile + pixel coordinates to inches



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# File 'lib/graster.rb', line 139

def axis_inches axis, tile, pixel
  @offset[axis] + tile*@tile_interval[axis] + pixel*@scale[axis]
end

#build_tiled_rows ⇒ Object 



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# File 'lib/graster.rb', line 174

def build_tiled_rows
  forward = false
  @tiled_rows = []
  @image.size[1].times {|y| @tiled_rows << tiled_row_spans(y, (forward = !forward)) }
end

#config_to_yaml ⇒ Object 



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# File 'lib/graster.rb', line 293

def config_to_yaml
  @config.map {|k,v| "#{k}: #{v.inspect}\n" }.join
end

#debug(msg) ⇒ Object 



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# File 'lib/graster.rb', line 297

def debug msg
  STDERR.puts msg if @debug
end

#generate_all_files ⇒ Object 



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# File 'lib/graster.rb', line 281

def generate_all_files
  open_gcode_file do |gcode|
    open_gmask_file do |gmask|
      render_tiled_image gcode, gmask
    end
  end

  open_cut_file do |cut|
    render_all_cuts cut
  end
end

#job_hash ⇒ Object

generate a unique id for this job



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# File 'lib/graster.rb', line 181

def job_hash
  [@image,@config].hash
end

#load_config_file(pn) ⇒ Object 



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# File 'lib/graster.rb', line 130

def load_config_file pn
  try_load_config_file pn or raise "config file not found '#{pn}'"
end

#load_image_file(pn) ⇒ Object 



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# File 'lib/graster.rb', line 134

def load_image_file pn
  self.image = Image.from_file(pn)
end

#merge_config(h) ⇒ Object 



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# File 'lib/graster.rb', line 98

def merge_config h
  @config ||= DEFAULTS.dup
  h.each {|k,v| @config[k] = v if DEFAULTS[k] }
  update_config
  return h
end

#open_cut_file(&block) ⇒ Object 



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# File 'lib/graster.rb', line 277

def open_cut_file &block
  io = GcodeFile.open "#{@image.filename}.cut.ngc", "w", &block
end

#open_gcode_file(&block) ⇒ Object 



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# File 'lib/graster.rb', line 269

def open_gcode_file &block
  io = GcodeFile.open "#{@image.filename}.raster.ngc", "w", &block
end

#open_gmask_file(&block) ⇒ Object 



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# File 'lib/graster.rb', line 273

def open_gmask_file &block
  io = GmaskFile.open "#{@image.filename}.raster.gmask", "w", &block
end

#render_all(gcode, gmask, cuts) ⇒ Object 



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# File 'lib/graster.rb', line 264

def render_all gcode, gmask, cuts
  render_tiled_image gcode, gmask
  render_all_cuts cuts
end

#render_all_cuts(gcode) ⇒ Object

render gcode to cut out the tiles



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# File 'lib/graster.rb', line 254

def render_all_cuts gcode
  gcode.preamble :feed => @config[:cut_feed]
  @config[:repeat][1].times do |ytile|
    @config[:repeat][0].times do |xtile|
      render_cut gcode, x_inches(xtile, 0), y_inches(ytile, 0)
    end
  end
  gcode.epilogue
end

#render_cut(gcode, x, y) ⇒ Object

cut out the tile with bottom left at x,y



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# File 'lib/graster.rb', line 223

def render_cut gcode, x, y
  radius = @config[:corner_radius]
  left = x
  bottom = y
  right = x+@config[:tile_size][0]
  top = y+@config[:tile_size][1]

  gcode.instance_eval do
    if radius && radius > 0
      jog :x => left, :y => bottom+radius
      move :x => left, :y => top-radius, :laser => true
      turn_cw :x => left+radius, :y => top, :i => radius
      move :x => right-radius, :y => top
      turn_cw :x => right, :y => top-radius, :j => -radius
      move :x => right, :y => bottom+radius
      turn_cw :x => right-radius, :y => bottom, :i => -radius
      move :x => left+radius, :y => bottom
      turn_cw :x => left, :y => bottom+radius, :j => radius
      nc :laser => false
    else
      jog :x => left, :y => bottom
      move :x => left, :y => top, :laser => true
      move :x => right, :y => top
      move :x => right, :y => bottom
      move :x => left, :y => bottom
      nc :laser => false
    end
  end
end

#render_tiled_image(gcode, gmask) ⇒ Object

render a complete tiled image to gcode and gmask streams



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# File 'lib/graster.rb', line 186

def render_tiled_image gcode, gmask
  debug "rendering tiled image"
  job_id = job_hash
  hyst = -@scale[0]/2
  gcode.comment "raster gcode for job #{job_id}"
  gcode.comment "image: #{@image.filename} #{@image.size.inspect}"
  gcode.comment "config: #{@config.inspect}"

  gcode.preamble :feed => @config[:feed], :mask => true
  gmask.preamble

  @config[:repeat][1].times do |ytile|
    debug "begin tile row #{ytile}"
    ypix = 0
    (0...@tiled_rows).each do |spans|
      debug "pixel row #{ypix} is empty" if spans.empty?
      unless spans.empty?
        yinches = y_inches(ytile, ypix)
        forward = spans[0][0] < spans[-1][1]
        dir = forward ? 1 : -1

        debug "pixel row #{ypix} at #{yinches} inches going #{forward ? 'forward' : 'backward'} with #{spans.size} spans"

        gcode.g0 :x => spans[0][0] - dir*@config[:overshoot], :y => yinches
        gcode.g1 :x => spans[-1][1] + dir*@config[:overshoot], :y => yinches
        gmask.begin_row forward
        spans.each {|span| gmask.span forward, span[0]+hyst, span[1]+hyst }
      end # unless spans.empty?
      ypix += 1
    end # @image.each_row
    debug "end tile row #{ytile}"
  end # @config[:repeat][i].times

  gcode.epilogue
end

#tiled_row_spans(y, forward = true) ⇒ Object

return a complete tiled row of spans converted to inches



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# File 'lib/graster.rb', line 152

def tiled_row_spans y, forward=true
  spans = @image.spans[y]
  return spans if spans.empty?
  tiled_spans = []

  if forward
    @config[:repeat][0].times do |tile|
      spans.each do |span|
        tiled_spans << [x_inches(tile,span[0]), x_inches(tile,span[1])]
      end
    end
  else
    (0...@config[:repeat][0]).to_a.reverse.each do |tile|
      spans.reverse.each do |span|
        tiled_spans << [x_inches(tile,span[1]), x_inches(tile,span[0])]
      end
    end
  end

  return tiled_spans
end

#try_load_config_file(pn) ⇒ Object 



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# File 'lib/graster.rb', line 118

def try_load_config_file pn
  if File.exist?(pn)
    c = {}
    YAML.load_file(pn).each {|k,v| c[k.intern] = v }
    return c
  end
end

#try_load_default_config_file ⇒ Object 



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# File 'lib/graster.rb', line 126

def try_load_default_config_file
  try_load_config_file './graster.yml'
end

#update_config ⇒ Object 



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# File 'lib/graster.rb', line 70

def update_config
  @scale = @config[:dpi].map{|n| 1.0/n }
  @offset = @config[:offset]

  if @image
    2.times {|i| @config[:tile_size][i] ||= @image.size[i]*@scale[i] }
    @tile_interval = []
    2.times {|i|
      @tile_interval << @config[:tile_size][i] + @config[:tile_spacing][i]
    }
    @tile_interval
  end

  @on_range = Range.new Image.f_to_pix(@config[:on_range].first),
                        Image.f_to_pix(@config[:on_range].last)
end

#validate_config ⇒ Object 



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# File 'lib/graster.rb', line 87

def validate_config
  raise InvalidConfig.new "X offset (#{@config[:offset][0]}) must be greater or equal to overshoot (#{@config[:overshoot]})"
end

#x_inches(tile, pixel) ⇒ Object 



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# File 'lib/graster.rb', line 143

def x_inches tile, pixel
  axis_inches 0, tile, pixel
end

#y_inches(tile, pixel) ⇒ Object 



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# File 'lib/graster.rb', line 147

def y_inches tile, pixel
  axis_inches 1, tile, pixel
end