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

- (Context) initialize(surface)

A new instance of Context



225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
 
# 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

- (Object) antialias Also known as: antialias_

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def antialias
  @antialias
end

- (Object) border

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def border
  @border
end

- (Object) dsize

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def dsize
  @dsize
end

- (Object) font_face(family, slant = :normal, weight = :normal)

def initialize



242
243
244
245
246
 
# File 'lib/tagen/cairo.rb', line 242

def font_face family, slant=:normal, weight=:normal
	slant = Cairo.const_get("font_slant_#{slant}".upcase)
	weight = Cairo.const_get("font_weight_#{weight}".upcase)
	select_font_face family, slant, weight
end

- (Object) font_matrix Also known as: font_matrix_

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def font_matrix
  @font_matrix
end

- (Object) font_options Also known as: font_options_

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def font_options
  @font_options
end

- (Object) line_cap Also known as: line_cap_

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def line_cap
  @line_cap
end

- (Object) line_dash

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def line_dash
  @line_dash
end

- (Object) line_join Also known as: line_join_

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def line_join
  @line_join
end

- (Object) operator Also known as: operator_

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def operator
  @operator
end

- (Object) size

def initialize



242
243
244
 
# File 'lib/tagen/cairo.rb', line 242

def size
  @size
end

Instance Method Details

- (Object) arc(x, y, r, a1, a2) 



444
445
446
447
448
449
 
# 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

- (Object) arc_ 



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

alias arc_ arc

- (Object) arg_neg(x, y, r, a1, a2) 



452
453
454
455
456
457
 
# 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

- (Object) bak(name, *args)

options: xy x y translate scale matrix state size



617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
 
# 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

- (Object) btranslate(tx = 0, ty = 0) 



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

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

- (Object) centertext(text) 



343
344
345
346
347
348
 
# 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

- (Object) circle(x, y, r) 



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

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

- (Object) copy_path(flat = false) 



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

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

- (Object) copy_path_ 



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

alias copy_path_ copy_path

- (Object) curveto(x1, y1, x2, y2, x3, y3) 



461
462
463
464
 
# 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

- (Object) dborder=(border) 



491
492
493
494
495
 
# File 'lib/tagen/cairo.rb', line 491

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

- (Object) dmvx(x = nil) 



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

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

- (Object) dmvxy(*xy) 



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

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

- (Object) dmvy(y = nil) 



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

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

- (Object) dscale(tx = 1, ty = 1, keep = true) 



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

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

- (Object) du(x, y = nil)

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



593
594
595
596
597
598
599
600
601
 
# 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

- (Object) fill(keep = true) 



381
382
383
384
385
386
387
388
389
 
# File 'lib/tagen/cairo.rb', line 381

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

- (Object) fill_ 



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

alias fill_ fill

- (Object) font_face_

def initialize



251
252
253
 
# File 'lib/tagen/cairo.rb', line 251

def font_face
  @font_face
end

- (Boolean) has_pos?

Returns:

  • (Boolean) 


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

def has_pos?; has_current_point? ? true : false end

- (Boolean) infill?(x, y)

Returns:

  • (Boolean) 


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

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

- (Object) initialize_ 



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

alias initialize_ initialize

- (Boolean) instroke?(x, y)

Returns:

  • (Boolean) 


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

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

- (Object) line(x, y, x1, y1) 



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

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

- (Object) lineno(x, y) 



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

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

- (Object) lineto(x, y) 



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

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

- (Object) mask(*args) 



391
392
393
394
395
396
397
 
# 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

- (Object) mvx(x = nil)

def dpos; ud(*pos) end



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

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

- (Object) mvxy(*xy)

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



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

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

- (Object) mvy(y = nil) 



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

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

- (Object) newline 



330
331
332
 
# File 'lib/tagen/cairo.rb', line 330

def newline
	mvxy(0, newline_height.to_s)
end

- (Object) newline_height 



317
318
319
320
321
322
323
324
325
326
327
328
 
# 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

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

def bak



684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
 
# 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

- (Object) pop 



522
523
524
 
# File 'lib/tagen/cairo.rb', line 522

def pop
	@xy_stack.pop
end

- (Object) pop_group(to_source = false) 



409
410
411
412
413
 
# File 'lib/tagen/cairo.rb', line 409

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

- (Object) pop_group_ 



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

alias pop_group_ pop_group

- (Object) push

push pos



518
519
520
521
 
# File 'lib/tagen/cairo.rb', line 518

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

- (Object) push_group(context = false) 



400
401
402
403
404
405
406
 
# File 'lib/tagen/cairo.rb', line 400

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

- (Object) push_group_ 



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

alias push_group_ push_group

- (Object) rdmvx(x) 



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

def rdmvx x;	rdmvxy(x, 0) end

- (Object) rdmvxy(x, y) 



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

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

- (Object) rectangle(x, y, w, h) 



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

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

- (Object) rectangle_

rectangle with rounded support



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

alias rectangle_ rectangle

- (Object) rline(x, y, x1, y1) 



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

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

- (Object) rlineno(x, y) 



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

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

- (Object) rlineto(x, y) 



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

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

- (Object) rmvdy(y) 



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

def rmvdy y;	rdmvxy(0, y) end

- (Object) rmvx(x) 



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

def rmvx x;		rmvxy(x, 0) end

- (Object) rmvxy(x, y) 



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

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

- (Object) rmvy(y) 



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

def rmvy y;		rmvxy(0, y) end

- (Object) rotate(angle) 



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

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

- (Object) rotate_ 



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

alias rotate_ rotate

- (Object) rrectangle(x, y, w, h) 



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

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

- (Object) scale(*args)

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



533
534
535
536
537
538
539
540
541
542
543
544
545
546
 
# 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

- (Object) scale_ 



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

alias scale_ scale

- (Object) sep(width, border = "1") 



334
335
336
337
338
339
340
341
 
# 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

- (Object) set_source(source) 



354
355
356
357
358
359
360
361
362
363
364
365
366
 
# 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

- (Object) set_source_ 



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

alias set_source_ set_source

- (Object) showtext(text, newline = false) 



307
308
309
310
311
312
313
314
315
 
# 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

- (Object) stroke(preverse = false, &blk) 



473
474
475
476
477
 
# File 'lib/tagen/cairo.rb', line 473

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

- (Object) stroke_ 



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

alias stroke_ stroke

- (Object) table(datas, oph = {})

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



718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
 
# 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

- (Object) tdu(x, y = nil)

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



605
606
607
608
609
610
611
612
613
 
# 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

- (Object) text_scale_min 



299
300
301
302
303
304
305
 
# 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

- (Object) translate(*txy) 



550
551
552
553
554
555
556
557
558
 
# 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

- (Object) translate_ 



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

alias translate_ translate

- (Object) tud(x, y = nil)

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



579
580
581
582
583
584
585
586
587
 
# 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

- (Object) ud(x, y = nil)

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



567
568
569
570
571
572
573
574
575
 
# 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