Class: Cairo::Context

Inherits:
Object show all
Defined in:
lib/tagen/cairo.rb

Overview

class ImageSurface

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(surface) ⇒ Context

Returns a new instance of Context.



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# File 'lib/tagen/cairo.rb', line 225

def initialize(surface) 
  initialize_(surface)
  move_to(0,0)

  self.dsize = 13
  self.dborder = 1

  @line_cap =line_cap_
  @line_join =line_join_
  @line_dash =line_dash_
  @font_matrix =font_matrix_
  @font_options =font_options_
  @font_face =font_face_
  @operator =operator_
  @antialias =antialias_
end

Instance Attribute Details

#antialias ⇒ Object Also known as: antialias_

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def antialias
  @antialias
end

#border ⇒ Object

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def border
  @border
end

#dsize ⇒ Object

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def dsize
  @dsize
end

#font_face(family, slant = :normal, weight = :normal) ⇒ Object

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def font_face
  @font_face
end

#font_matrix ⇒ Object Also known as: font_matrix_

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def font_matrix
  @font_matrix
end

#font_options ⇒ Object Also known as: font_options_

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def font_options
  @font_options
end

#line_cap ⇒ Object Also known as: line_cap_

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def line_cap
  @line_cap
end

#line_dash ⇒ Object

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def line_dash
  @line_dash
end

#line_join ⇒ Object Also known as: line_join_

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def line_join
  @line_join
end

#operator ⇒ Object Also known as: operator_

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def operator
  @operator
end

#size ⇒ Object

def initialize



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# File 'lib/tagen/cairo.rb', line 242

def size
  @size
end

Instance Method Details

#arc(x, y, r, a1, a2) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 444

def arc(x,y,r, a1,a2)
  x,y=__pos(x,y)
  a1,a2=__angle(a1,a2)
  new_path # need new_path to clear prior-path
  arc_(x,y,r,a1,a2)
end

#arc_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 443

alias arc_ arc

#arg_neg(x, y, r, a1, a2) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 452

def arg_neg(x,y,r, a1,a2)
  x,y=__pos(x,y)
  a1,a2=__angle(a1,a2)
  new_path
  arc_negative(x,y,r, a1,a2)
end

#bak(name, *args) ⇒ Object

options: xy x y translate scale matrix state size



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# File 'lib/tagen/cairo.rb', line 617

def bak(name, *args) 
  case name.to_sym
  # :xy x y
  when :xy
    x_, y_ = user_to_device(*current_point)
    yield
    move_to( *device_to_user(x_, y_))
  when :x
    x_, y_ = user_to_device(*current_point)
    yield
    x = device_to_user(x_, y_)[0]
    y = current_point[1]
    move_to(x,y)
  when :y
    x_, y_ = user_to_device(*current_point)
    yield
    x = current_point[0]
    y = device_to_user(x_, y_)[1]
    move_to(x,y)

  # :translate scale matrix
  when :translate
    xy_d = ud(0,0)
    yield
    a = xy_d.gach(&:to_s)
    translate(*a)
  when :scale
    txy_d = tud(1,1)
    yield
    scale(*txy_d.gach(&:to_s))
  when :matrix  # combine translate and scale
    xy_d = ud(0,0)
    txy_d = tud(1,1)
    yield
    scale(*txy_d.gach(&:to_s))
    translate(*xy_d.gach(&:to_s))

  # state
  when :state
    save
    yield
    restore

  # size
  when :size
    size_ = @dsize
    yield
    self.dsize = size_
  when :border
    border_ = @dborder
    yield
    self.dborder = border_

  # all: save xy size
  when :all 
    x_, y_ = user_to_device(*current_point)
    size_ = @dsize
    save
    yield
    restore
    move_to( *device_to_user(x_, y_))
    self.dsize = size_
  else
    raise ArgumentError, "bak(:#{name})"
  end
end

#btranslate(tx = 0, ty = 0) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 560

def btranslate tx=0,ty=0; translate tx.to_s, ty.to_s end

#centertext(text) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 343

def centertext(text)
  advanced_x = nil
  advanced_x = text_extents(text.to_s).to_a[-2]
  mvxy( ((1-advanced_x)/2.0).to_s , '0')
  showtext(text, true)
end

#circle(x, y, r) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 442

def circle(x,y,r); arc(x,y,r,0,360) end

#copy_path(flat = false) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 470

def copy_path(flat=false) flat ? copy_path_flat : copy_path_ end

#copy_path_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 469

alias copy_path_ copy_path

#curveto(x1, y1, x2, y2, x3, y3) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 461

def curveto(x1,y1, x2,y2, x3,y3)
  x1,y1,x2,y2,x3,y3=__pos(x1,y1,x2,y2,x3,y3)
  curve_to(x1,y1, x2,y2, x3,y3)
end

#dborder=(border) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 491

def dborder=(border)
  @dborder = border
  @border = tdu(border)
  self.line_width = @border
end

#dmvx(x = nil) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 425

def dmvx(x=nil); x ? dmvxy(x, "0") : ud(*current_point)[0] end

#dmvxy(*xy) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 418

def dmvxy(*xy)  xy.empty? ? ud(*current_point) : move_to(*__dpos(*xy)) end

#dmvy(y = nil) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 430

def dmvy(y=nil) y ? dmvxy("0", y) : ud(*current_point)[1] end

#dscale(tx = 1, ty = 1, keep = true) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 547

def dscale tx=1,ty=1, keep=true; scale tx.to_s, ty.to_s, keep end

#du(x, y = nil) ⇒ Object

device to user (x,nil) (nil,y) (x,y)



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# File 'lib/tagen/cairo.rb', line 593

def du(x,y=nil)
  if y==nil
    device_to_user(x,0)[0]
  elsif x==nil
    device_to_user(0,y)[1]
  else
    device_to_user(x,y)
  end
end

#fill(keep = true) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 381

def fill(keep=true)
  if keep
    xy = current_point
    fill_()
    move_to(*xy)
  else
    fill_()
  end
end

#fill_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 380

alias fill_ fill

#font_face_ ⇒ Object

def initialize



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# File 'lib/tagen/cairo.rb', line 251

def font_face
  @font_face
end

#has_pos? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tagen/cairo.rb', line 515

def has_pos?; has_current_point? ? true : false end

#infill?(x, y) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tagen/cairo.rb', line 351

def infill?(x,y); in_fill?(x,y) end

#initialize_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 224

alias initialize_ initialize

#instroke?(x, y) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tagen/cairo.rb', line 350

def instroke?(x,y); in_stroke?(x,y) end

#line(x, y, x1, y1) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 439

def line(x,y, x1,y1)  bak(:xy){mvxy(x,y); lineto(x1,y1) } end

#lineno(x, y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 437

def lineno(x,y)   bak(:xy){lineto(x,y)} end

#lineto(x, y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 435

def lineto(x,y)   line_to(*__pos(x,y) ) end

#mask(*args) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 391

def mask(*args)
  if args[0].class == Pattern
    mask(args[0])
  elsif args[0].class == Surface
    mask_surface(*args)
  end
end

#mvx(x = nil) ⇒ Object

def dpos; ud(*pos) end



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# File 'lib/tagen/cairo.rb', line 424

def mvx(x=nil);  x ? mvxy(x, "0") : current_point[0] end

#mvxy(*xy) ⇒ Object

alias xy_ move_to def xy_(*xy) xy.empty? ? current_point : move_to(*xy) end



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# File 'lib/tagen/cairo.rb', line 417

def mvxy(*xy)   xy.empty? ? current_point : move_to(*__pos(*xy)) end

#mvy(y = nil) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 429

def mvy(y=nil)  y ? mvxy("0", y ) : current_point[1] end

#newline ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 330

def newline
  mvxy(0, newline_height.to_s)
end

#newline_height ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 317

def newline_height
  out = nil; prev=nil
  text_scale_min do
    ascent, descent = font_extents.to_a
    out = ascent+descent
    prev = tud(nil, 1)
  end

  cur = tud(nil, 1)
  out = prev/cur*out
  out
end

#paint_img(img, selection = nil, rotate = 0, scale = 1) ⇒ Object

selection=[x|y=nil, w|h=nil]



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# File 'lib/tagen/cairo.rb', line 684

def paint_img(img, selection=nil, rotate=0, scale=1)  
  # handle arg selection
  selection ||= []
  select_x,select_y,select_w,select_h = selection
  select_x ||= 0; select_y ||= 0
  select_w ||= img.w-select_x; select_h ||= img.h-select_y
  select_w,select_h=1,1 if select_w<=0 or select_h<=0

  select_w,select_h = select_w*scale.to_f, select_h*scale.to_f
  select_x,select_y = select_x*scale.to_f, select_y*scale.to_f

  bak(:state) do

    # rotate 
    translate(surface.w/2, surface.h/2)
    rotate(rotate)
    translate(-select_w/2, -select_h/2)

    # selection [x,y,w,h]
    rectangle(0,0,select_w,select_h)
    clip
    translate(-select_x,-select_y)

    # scale
    scale(scale, scale)
    
    # paint
    set_source(img)
    paint
  end
end

#pop ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 522

def pop
  @xy_stack.pop
end

#pop_group(to_source = false) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 409

def pop_group(to_source=false)
  group = pop_group_
  set_source(group) if to_source
  group
end

#pop_group_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 408

alias pop_group_ pop_group

#push ⇒ Object

push pos



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# File 'lib/tagen/cairo.rb', line 518

def push
  @xy_stack ||=[]
  @xy_stack.push(current_point)
end

#push_group(context = false) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 400

def push_group(context=false)
  if context
    push_group_widht_context(context)
  else
    push_group_
  end
end

#push_group_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 399

alias push_group_ push_group

#rdmvx(x) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 427

def rdmvx x;  rdmvxy(x, 0) end

#rdmvxy(x, y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 420

def rdmvxy(x,y)   move_to(*__tpos(x,y))  end

#rectangle(x, y, w, h) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 806

def rectangle(x,y,w,h)  rectangle_(*__pos(x,y), *__du(w,h) ) end

#rectangle_ ⇒ Object

rectangle with rounded support



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# File 'lib/tagen/cairo.rb', line 805

alias rectangle_ rectangle

#rline(x, y, x1, y1) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 440

def rline(x,y, x1,y1) bak(:xy){rmvxy(x,y); rlineto(x1,y1)} end

#rlineno(x, y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 438

def rlineno(x,y)  bak(:xy){rlineto(x,y)} end

#rlineto(x, y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 436

def rlineto(x,y)  line_to(*__rpos(x,y)) end

#rmvdy(y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 432

def rmvdy y;  rdmvxy(0, y) end

#rmvx(x) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 426

def rmvx x;   rmvxy(x, 0) end

#rmvxy(x, y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 419

def rmvxy(x,y)    move_to(*__rpos(x,y)) end

#rmvy(y) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 431

def rmvy y;   rmvxy(0, y) end

#rotate(angle) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 528

def rotate(angle); rotate_(__angle(angle)) end

#rotate_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 527

alias rotate_ rotate

#rrectangle(x, y, w, h) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 807

def rrectangle(x,y,w,h) rectangle_(*__rpos(x,y), *__du(w,h) ) end

#scale(*args) ⇒ Object

args@ tx,ty,keep=true keep size border



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# File 'lib/tagen/cairo.rb', line 533

def scale(*args)
  if args.empty?
    tdu 1,1
  else
    tx, ty, keep = args
    keep ||= true
    tx,ty = __tdu(tx,ty)
    scale_(tx,ty)
    if keep
      self.dsize=@dsize
      self.dborder=@dborder
    end
  end
end

#scale_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 530

alias scale_ scale

#sep(width, border = "1") ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 334

def sep(width, border="1")
  mvxy(0, "0")
  line("0","0", width, "0")
  bak(:border) do
    self.border = border
    stroke
  end
end

#set_source(source) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 354

def set_source(source)
  # [r,g,b,a=1.0] Pattern Surface
  # "#rgb[a]", "name"  (set_source_color)
  # Pixbuf             (set_source_pixbuf)
  case 
  when String===source
    set_source_color(source)
  when Array===source, source.kind_of?(Pattern), source.kind_of?(Surface)
    set_source_(source)
  else
    set_source_pixbuf(*args)
  end
end

#set_source_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 353

alias set_source_ set_source

#showtext(text, newline = false) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 307

def showtext(text, newline=false)
  text_scale_min do
    ascent, descent = font_extents.to_a
    mvxy('0', ascent.to_s)
    show_text(text.to_s)
    mvxy('0', (-ascent).to_s)
    mvxy(0, (ascent+descent).to_s) if newline
  end
end

#stroke(preverse = false, &blk) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 473

def stroke(preverse=false, &blk)
  bak(:xy) {
    stroke_(preverse, &blk)
  }
end

#stroke_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 472

alias stroke_ stroke

#table(datas, oph = {}) ⇒ Object

base on scale(*wh) datas: [ [..], ]



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# File 'lib/tagen/cairo.rb', line 718

def table(datas, oph={}) 

  # width height
  # row_nrs col_nrs
  cols = oph[:pos]
  spacing = oph[:spacing] || [4,1]
  spacing = tdu(*spacing)

  # ==>datas row_nrs and col_nrs
  datas = [datas] if not Array===datas[0]
  row_nrs = datas.size
  col_nrs = datas[0].size

  # ==> cell_height 0.05 height
  cell_height = newline_height + spacing[1]*2
  height =  cell_height * datas.size

  ## ==>cols [0, 0.5, 1.0]
  # cell_widths [text_extents..]
  if oph[:pos] == "<" || oph[:pos] == ">"
    cell_widths = [0]
    cell_widths += datas.transpose.gach do |cols|
      cols.gach{|v| text_extents(v.to_s).to_a[-2]}.max
    end
  end

  case oph[:pos]
  when "<"
    if oph[:border]
      pos = cell_widths[0]+spacing[0]*2
      cols = [0, pos, pos+cell_widths[1]+spacing[0] ]
    else
      pos = cell_widths[0]+spacing[0]
      cols = [0, pos, pos+cell_widths[1]+spacing[0] ]
    end
  when ">"
    if oph[:border]
      pos = 1-(cell_widths[0]+cell_widths[1]+spacing[0]*4)
      cols = [ pos, pos+cell_widths[0]+spacing[0]*2, 1 ]
    else
      pos = 1-(cell_widths[0]+cell_widths[1]+spacing[0]*3)
      cols = [ pos, pos+cell_widths[0]+spacing[0], 1 ]
    end
  else
    cols ||= (0..col_nrs).map{|v| v/col_nrs.to_f}
  end
  width = cols[-1]


  # draw border 
  if oph[:border]
    rectangle cols[0], "0", cols[-1], height

    # draw rows
    bak(:xy) {
      row_nrs.each do 
        ry cell_height; rlineno cols[-1], 0
      end
    }

    # draw cols
    bak(:xy) {
      cols.gach do |v|
        x v; rlineno 0, height
      end
    }

    stroke
  end

  # draw text
  datas.gach do |rows|
    bak(:xy) {
      rxy 0, spacing[1]
      rows.gach do |row, i|
        xy cols[i], "0"
        rx spacing[0]
        showtext row
      end
    }
    ry cell_height
  end

  [width, height]
end

#tdu(x, y = nil) ⇒ Object

device to user distance (x,nil) (nil,y) (x,y)



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# File 'lib/tagen/cairo.rb', line 605

def tdu(x,y=nil)
  if y==nil
    device_to_user_distance(x, 0)[0]
  elsif x==nil
    device_to_user_distance(0, y)[1]
  else
    device_to_user_distance(x,y)
  end
end

#text_scale_min ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 299

def text_scale_min
  min = tud(1,1).min
  bak(:scale) do
    dscale min, min
    yield
  end
end

#translate(*txy) ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 550

def translate(*txy)
  if txy.empty?
    ud 0,0
  else
    txy_ = xy
    translate_(*__du(*txy))
    mvxy(*txy_)
  end
end

#translate_ ⇒ Object 



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# File 'lib/tagen/cairo.rb', line 549

alias translate_ translate

#tud(x, y = nil) ⇒ Object

user_to_device_sitance (x,nil) (nil,y) (x,y)



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# File 'lib/tagen/cairo.rb', line 579

def tud(x,y=nil)
  if y==nil
    user_to_device_distance(x, 0)[0]
  elsif x==nil
    user_to_device_distance(0, y)[1]
  else
    user_to_device_distance(x,y)
  end
end

#ud(x, y = nil) ⇒ Object

user_to_device (x,nil) (nil,y) (x,y)



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# File 'lib/tagen/cairo.rb', line 567

def ud(x,y=nil)
  if y==nil
    user_to_device(x,0)[0]
  elsif x==nil
    user_to_device(0,y)[1]
  else
    user_to_device(x,y)
  end
end