Class: PSWriter

Inherits:
Object
  • Object
show all
Includes:
PS_Private
Defined in:
lib/geotree/pswriter.rb

Overview

A debugging / demonstration utility class that generates postscript images

Constant Summary

Constants included from PS_Private

PS_Private::FONTHEIGHT_, PS_Private::LINETYPE_, PS_Private::LINEWIDTH_, PS_Private::LINEWIDTH_FACTOR_, PS_Private::LT_DASHED_, PS_Private::LT_DOTTED_, PS_Private::LT_SOLID_, PS_Private::RGB_, PS_Private::SCALE_, PS_Private::S_CLOSED_, PS_Private::S_OPEN_, PS_Private::S_START_, PS_Private::TRANS_

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ PSWriter

Returns a new instance of PSWriter.

Parameters:

  • path —

    path of file to write (e.g. xxx.ps)



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# File 'lib/geotree/pswriter.rb', line 50

def initialize(path)
  @path = path
  @line_width = -1
  @rgb = [-1,0,0]
  @phys_size = [612,792]
  @state = S_START_
  @stack = []
  @buffer_stack = []
  @dict = {}
  @dict_keys = []

  de("A","{arc} bind")
  de("CP","{closepath} bind")
  de('F','{fill} bind')
  de('I','{index} bind')
  de("L","{lineto} bind")
  de("M","{moveto} bind")
  de("NP","{newpath} bind")
  de('SRGB','{setrgbcolor} bind')
  de('SLW','{setlinewidth} bind')
  de('P','{pop} bind')
  de("R","{rmoveto} bind")
  de("S","{stroke} bind")
  de('SCL','{scale} bind')
  de('TR','{translate} bind')
  de("V","{rlineto} bind")
  de("DSH","{setdash} bind")

  set_logical_page_size(1000,1200)

  @line_type = 0
  @scale_ = 0
  @font_height = 0
  @scaled_font_height = 0

  @page_used = false
  @s = ''
end

Instance Method Details

#add_element(key, val) ⇒ Object

Define an element by placing it in the dictionary



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# File 'lib/geotree/pswriter.rb', line 390

def add_element(key,val)
  de(key,'{'+val+'}')
end

#close ⇒ Object

Close document and write to disk



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# File 'lib/geotree/pswriter.rb', line 104

def close
  if @state < S_CLOSED_
    if @stack.size != 0
      warn("state stack nonempty for #{@path}")
    end

    flush_page

    # Construct file by combining header, dictionary, and
    # the user text

    s = get_doc_header
    s << get_doc_dictionary
    s << @s
    set_state(S_CLOSED_)

    write_text_file(@path, s)
  end
end

#draw_circle(cx, cy, radius) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 193

def draw_circle(cx, cy, radius)
  de("CH", "{NP 0 360 A CP S}")
  a("NP");
  a(cx);
  a(cy);
  a(radius);
  a("CH");
  cr
end

#draw_disc(cx, cy, radius) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 184

def draw_disc(cx,cy,radius)
  de("CF", "{NP 0 360 A CP F}")
  a(cx);
  a(cy);
  a(radius);
  a("CF")
  cr
end

#draw_element(key) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/geotree/pswriter.rb', line 394

def draw_element(key)
  val = @dict[key]
  raise ArgumentError if !@dict.member?(key)
  a(key)
end

#draw_line(x1, y1, x2, y2) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 203

def draw_line(x1,y1,x2,y2)
  de("LN", "{NP 4 2 roll M L CP S}")

  #    a("NP");
  a(x1);
  a(y1);
  #    a("M");
  a(x2);
  a(y2);
  a("LN");
  cr
end

#draw_polygon(polygon, x, y) ⇒ Object

Draw a polygon

Parameters:

  • polygon —

    array of 2n coordinates, defining closed n-gon

  • x —

    translation to apply to coordinates

  • y 


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# File 'lib/geotree/pswriter.rb', line 269

def draw_polygon(polygon, x, y)

  push(translate(x, y))
  a("NP")
  i = 0
  while i < polygon.size
    a(polygon[i])
    a((polygon[i + 1]))
    if (i == 0)
      a("M");
    else
      a("L");
    end
    i += 2
  end
  a("CP S")
  cr
  pop()
end

#draw_rect(x, y, w, h, inset = 0) ⇒ Object

Draw a rectangle

Parameters:

  • inset (defaults to: 0) —

    distance to inset rectangle boundary (positive: shrink; negative:expand)



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# File 'lib/geotree/pswriter.rb', line 137

def draw_rect(x,y,w,h,inset = 0)
  de("RC","{3 I 3 I M 1 I 0 V 0 1 I V 1 I neg 0 V P P P P CP S }")
  a(x + inset)
  a(y + inset)
  a(w - 2 * inset);
  a(h - 2 * inset);
  a("RC");
  cr
end

#draw_string(string, x, y) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 164

def draw_string(string, x, y)
  if @font_height == 0
    set_font_size(28)
  end

  #    /TEXTL { currentpoint S M 0 0 R show } def
  #    % Right-justified text
  #    /TEXTR { currentpoint S M dup stringwidth pop neg 0 R show } def
  #    % Centered text
  de("TX", "{currentpoint S M dup stringwidth pop -2 div 0 R show }")

  a(x)
  a(y - @scaled_font_height / 2);
  a("M")
  work = make_eps_safe(string)
  a(work)
  a("TX")
  cr
end

#new_page(page_title) ⇒ Object

Start a new page

Parameters:

  • page_title —

    title of new page



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# File 'lib/geotree/pswriter.rb', line 353

def new_page(page_title)
  set_state(S_OPEN_);
  flush_page

  print_page_header(page_title);
  @page_used = true;
end

#page_size ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 131

def page_size
  return @document_size
end

#pop(count = 1) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 368

def pop(count = 1)
  count.times do
    n = @stack.size   - 1
    op = @stack.pop
    case op.type
    when RGB_
      set_rgb(op.arg(0),op.arg(1),op.arg(2))
    when LINETYPE_
      set_line_type(op.arg(0))
    when LINEWIDTH_
      set_line_width(op.arg(0))
    when TRANS_
      translate(op.arg(0),op.arg(1))
    when FONTHEIGHT_
      set_font_size(op.arg(0))
    when SCALE_
      set_scale(op.arg(0))
    end
  end
end

#push(obj) ⇒ Object

Push previous state (returned by an operation) onto a stack to be restored later; call must be balanced by later call to pop()

Parameters:

  • obj —

    state object returned by operation such as setGray(), translate()



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# File 'lib/geotree/pswriter.rb', line 364

def push(obj)
  @stack << obj
end

#set_font_size(height) ⇒ Object

Raises:



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# File 'lib/geotree/pswriter.rb', line 147

def set_font_size(height)
  raise IllegalStateException if @state != S_OPEN_

  ret = SOper.null

  if @font_height != height
    ret = SOper.new(FONTHEIGHT_, @font_height)
    @font_height = height;
    @scaled_font_height = height / @scale;
    a("/Monaco findfont ");
    a(@scaled_font_height);
    a("scalefont setfont\n");
    cr
  end
  ret
end

#set_gray(f) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 333

def set_gray(f)
  set_rgb(f,f,f)
end

#set_line_dashed ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 220

def set_line_dashed
  set_line_type(LT_DASHED_)
end

#set_line_dotted ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 224

def set_line_dotted
  set_line_type(LT_DOTTED_)
end

#set_line_solid ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 216

def set_line_solid
  set_line_type(LT_SOLID_)
end

#set_line_type(type) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 239

def set_line_type(type)
  ret = SOper.null
  if  @line_type != type
    ret = SOper.new(LINETYPE_, @line_type)
    @line_type = type
    case type
    when LT_DASHED_
      n =    (@scale * 30).to_i
      a("[");
      a(n);
      a(n);
      a("] 0 DSH");
    when LT_DOTTED_
      int n =    (@scale * 30).to_i
      n2 = n / 4
      a("[");
      a(n2);
      a(n);
      a("] 0 DSH");
    else # LT_SOLID_
      a("[] 0 DSH");
    end
  end
  ret
end

#set_line_width(w) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 307

def set_line_width(w)
  ret = SOper.null
  if @line_width != w

    ret = SOper.new(LINEWIDTH_, @line_width)
    @line_width = w
    a(LINEWIDTH_FACTOR_ * @scale   * @line_width)
    a("SLW");
  end
  ret
end

#set_logical_page_size(width, height) ⇒ Object

Set logical page size. Subsequent drawing operations will be scaled appropriately. Default logical page size is 1000 x 1200 units.

Raises:



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# File 'lib/geotree/pswriter.rb', line 126

def set_logical_page_size( width,  height)
  raise IllegalStateException if @state != S_START_
  @document_size = [width,height]
end

#set_rgb(r, g, b) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 319

def set_rgb(r,g,b)
  ret = SOper.null
  if (r != @rgb[0] || g != @rgb[1] || b != @rgb[2])

    ret = SOper.new(RGB_, @rgb[0], @rgb[1], @rgb[2])
    a(r)
    a(g)
    a(b)
    @rgb = [r,g,b]
    a("SRGB");
  end
  ret
end

#set_scale(f) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 228

def set_scale(f)
  ret = SOper.null
  if   f != 1
    ret = SOper.new(SCALE_, 1.0 / f)
    a(f);
    a(f);
    a("SCL");
  end
  ret
end

#set_state(s) ⇒ Object 



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# File 'lib/geotree/pswriter.rb', line 337

def set_state(  s)
  if (@state != s)
    case s
    when S_OPEN_
      raise IllegalStateException if @state != S_START_
      @state = s
      #        print_document_header
    when S_START_
      raise IllegalStateException
    end
    @state = s
  end
end

#start_buffer ⇒ Object

Raises:



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# File 'lib/geotree/pswriter.rb', line 89

def start_buffer
  raise IllegalStateException if !@buffer_stack.empty?
  @buffer_stack << @s
  @s = ''
end

#stop_buffer ⇒ Object

Raises:



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# File 'lib/geotree/pswriter.rb', line 95

def stop_buffer
  raise IllegalStateException if @buffer_stack.empty?
  ret = @s
  @s = @buffer_stack.pop
  ret
end

#translate(tx, ty, neg = false) ⇒ Object

Translate subsequent drawing operations



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# File 'lib/geotree/pswriter.rb', line 290

def translate(tx,ty,neg=false)

  ret = SOper.null
  if (neg)
    tx = -tx;
    ty = -ty;
  end
  if (tx != 0 || ty != 0)
    ret = SOper.new(TRANS_, -tx, -ty)

    a(tx);
    a(ty);
    a("TR");
  end
  ret
end