Class: Rubygoo::Rect

Inherits:
Array
  • Object
show all
Defined in:
lib/rubygoo/rect.rb

Overview

A Rect is a representation of a rectangle, with four core attributes (x offset, y offset, width, and height) and a variety of functions for manipulating and accessing these attributes.

Like all coordinates in Rubygame (and its base library, SDL), x and y offsets are measured from the top-left corner of the screen, with greater y offsets being lower. Thus, specifying the x and y offsets of the Rect is equivalent to setting the location of its top-left corner.

In Rubygame, Rects are used for collision detection and describing the area of a Surface to operate on.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*argv) ⇒ Rect

Create a new Rect, attempting to extract its own information from the given arguments. The arguments must fall into one of these cases:

- 4 integers +(x, y, w, h)+.
- 1 Rect or Array containing 4 integers +([x, y, w, h])+.
- 2 Arrays containing 2 integers each +([x,y], [w,h])+.
- 1 object with a +rect+ attribute which is a valid Rect object.

All rect core attributes (x,y,w,h) must be integers.



85
86
87
88
89
90
91
92
93
94
95
96
97
 
# File 'lib/rubygoo/rect.rb', line 85

def initialize(*argv)
	case argv.length
	when 1
		if argv[0].kind_of? Array; super(argv[0])
		elsif argv[0].respond_to? :rect; super(argv[0])
		end
	when 2
		super(argv[0].concat(argv[1]))
	when 4
		super(argv)
	end
	return self
end

Class Method Details

.new_from_object(object) ⇒ Object

Extract or generate a Rect from the given object, if possible, using the following process:

1. If it's a Rect already, return a duplicate Rect.
2. Elsif it's an Array with at least 4 values, make a Rect from it.
3. Elsif it has a +rect+ attribute., perform (1) and (2) on that.
4. Otherwise, raise TypeError.

See also Surface#make_rect()



108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
 
# File 'lib/rubygoo/rect.rb', line 108

def Rect.new_from_object(object)
	case(object)
	when Rect
		return object.dup
	when Array 
		if object.length >= 4
			return Rect.new(object)
		else
			raise(ArgumentError,"Array does not have enough indices to be made into a Rect (%d for 4)."%object.length )
		end
	else
		begin
			case(object.rect)
			when Rect
				return object.rect.dup
			when Array
				if object.rect.length >= 4
					return Rect.new(object.rect)
				else
					raise(ArgumentError,"Array does not have enough indices to be made into a Rect (%d for 4)."%object.rect.length )
				end
			end				# case object.rect
		rescue NoMethodError # if no rect.rect
			raise(TypeError,"Object must be a Rect or Array [x,y,w,h], or have an attribute called 'rect'. (Got %s instance.)"%object.class)
		end
	end # case object
end

Instance Method Details

#bottom ⇒ Object Also known as: b

Return the y coordinate of the bottom side of the Rect.



204
 
# File 'lib/rubygoo/rect.rb', line 204

def bottom; return self.at(1)+self.at(3); end

#bottom=(b) ⇒ Object Also known as: b=

Set the y coordinate of the bottom side of the Rect by translating the Rect (adjusting the y offset).



208
 
# File 'lib/rubygoo/rect.rb', line 208

def bottom=(b); self[1] = b - self.at(3); return b; end

#bottomleft ⇒ Object Also known as: bl

Return the x and y coordinates of the bottom-left corner of the Rect



275
 
# File 'lib/rubygoo/rect.rb', line 275

def bottomleft; return self.at(0), self.bottom; end

#bottomleft=(bottomleft) ⇒ Object Also known as: bl=

Set the x and y coordinates of the bottom-left corner of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


279
280
281
282
283
 
# File 'lib/rubygoo/rect.rb', line 279

def bottomleft=(bottomleft)
	raise ArgumentError, "Rect#bottomleft= takes an Array of form [x, y]." if bottomleft.size != 2
	self[0], self.bottom = bottomleft
	return bottomleft
end

#bottomright ⇒ Object Also known as: br

Return the x and y coordinates of the bottom-right corner of the Rect



289
 
# File 'lib/rubygoo/rect.rb', line 289

def bottomright; return self.right, self.bottom; end

#bottomright=(bottomright) ⇒ Object Also known as: br=

Set the x and y coordinates of the bottom-right corner of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


293
294
295
296
297
 
# File 'lib/rubygoo/rect.rb', line 293

def bottomright=(bottomright)
	raise ArgumentError, "Rect#bottomright= takes an Array of form [x, y]." if bottomright.size != 2
	self.right, self.bottom = bottomright
	return bottomright
end

#center ⇒ Object Also known as: c

Return the x and y coordinates of the center of the Rect.



214
 
# File 'lib/rubygoo/rect.rb', line 214

def center; return self.centerx, self.centery; end

#center=(center) ⇒ Object Also known as: c=

Set the x and y coordinates of the center of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


218
219
220
221
222
 
# File 'lib/rubygoo/rect.rb', line 218

def center=(center)
    raise ArgumentError, "Rect#center= takes an Array of the form [x,y]." if center.size != 2
	self.centerx, self.centery = center
	center
end

#centerx ⇒ Object Also known as: cx

Return the x coordinate of the center of the Rect



227
 
# File 'lib/rubygoo/rect.rb', line 227

def centerx; return self.at(0)+(self.at(2).div(2)); end

#centerx=(x) ⇒ Object Also known as: cx=

Set the x coordinate of the center of the Rect by translating the Rect (adjusting the x offset).



231
 
# File 'lib/rubygoo/rect.rb', line 231

def centerx=(x); self[0] = x - (self.at(2).div(2)); return x; end

#centery ⇒ Object Also known as: cy

Return the y coordinate of the center of the Rect



237
 
# File 'lib/rubygoo/rect.rb', line 237

def centery; return self.at(1)+(self.at(3).div(2)); end

#centery=(y) ⇒ Object Also known as: cy=

Set the y coordinate of the center of the Rect by translating the Rect (adjusting the y offset).



241
 
# File 'lib/rubygoo/rect.rb', line 241

def centery=(y); self[1] = y- (self.at(3).div(2)); return y; end

#clamp(rect) ⇒ Object

As #clamp!, but the original caller is not changed.



368
369
370
 
# File 'lib/rubygoo/rect.rb', line 368

def clamp(rect)
	self.dup.clamp!(rect)
end

#clamp!(rect) ⇒ Object

Translate the calling Rect to be entirely inside the given Rect. If the caller is too large along either axis to fit in the given rect, it is centered with respect to the given rect, along that axis.



375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
 
# File 'lib/rubygoo/rect.rb', line 375

def clamp!(rect)
	nself = self.normalize
	rect = Rect.new_from_object(rect)
	#If self is inside given, there is no need to move self
	unless rect.contain?(nself)

		#If self is too wide:
		if nself.at(2) >= rect.at(2)
			self[0] = rect.centerx - nself.at(2).div(2)
			#Else self is not too wide
		else
			#If self is to the left of arg
			if nself.at(0) < rect.at(0)
				self[0] = rect.at(0)
			#If self is to the right of arg
			elsif nself.right > rect.right
				self[0] = rect.right - nself.at(2)
			#Otherwise, leave x alone
			end
		end

		#If self is too tall:
		if nself.at(3) >= rect.at(3)
			self[1] = rect.centery - nself.at(3).div(2)
			#Else self is not too tall
		else
			#If self is above arg
			if nself.at(1) < rect.at(1)
				self[1] = rect.at(1)
			#If self below arg
			elsif nself.bottom > rect.bottom
				self[1] = rect.bottom - nself.at(3)
			#Otherwise, leave y alone
			end
		end
	end
	return self
end

#clip(rect) ⇒ Object

As #clip!, but the original caller is not changed.



415
416
417
 
# File 'lib/rubygoo/rect.rb', line 415

def clip(rect)
	self.dup.clip!(rect)
end

#clip!(rect) ⇒ Object

Crop the calling Rect to be entirely inside the given Rect. If the caller does not intersect the given Rect at all, its width and height are set to zero, but its x and y offsets are not changed.

As a side effect, the Rect is normalized.



424
425
426
427
428
429
430
431
432
433
434
435
436
437
 
# File 'lib/rubygoo/rect.rb', line 424

def clip!(rect)
	nself = self.normalize
	other = Rect.new_from_object(rect).normalize!
	if self.collide_rect?(other)
		self[0] = [nself.at(0), other.at(0)].max
		self[1] = [nself.at(1), other.at(1)].max
		self[2] = [nself.right, other.right].min - self.at(0)
		self[3] = [nself.bottom, other.bottom].min - self.at(1)
	else #if they do not intersect at all:
		self[0], self[1] = nself.topleft
		self[2], self[3] = 0, 0
	end
	return self
end

#collide_array(array_rects) ⇒ Object

Iterate through all elements in the given Array, and return the index of the first element which is a Rect that collides with the caller.



467
468
469
470
471
472
473
474
 
# File 'lib/rubygoo/rect.rb', line 467

def collide_array(array_rects)
	for i in (0...(array_rects.length))
		if array_rects[i].collide_rect?(self)
			return i
		end
	end
	return nil
end

#collide_array_all(array_rects) ⇒ Object

Iterate through all elements in the given Array, and return an Array containing the indices of every element that is a Rect that collides with the caller.



479
480
481
482
483
484
485
486
487
 
# File 'lib/rubygoo/rect.rb', line 479

def collide_array_all(array_rects)
	indexes = []
	for i in (0...(array_rects.length))
		if array_rects[i].collide_rect?(self)
			indexes += [i]
		end
	end
	return indexes
end

#collide_hash(hash_rects) ⇒ Object

Iterate through all key/value pairs in the given hash table, and return the first pair whose value is a Rect that collides with the caller.

Because a hash table is unordered, you should not expect any particular Rect to be returned first.



445
446
447
448
449
450
 
# File 'lib/rubygoo/rect.rb', line 445

def collide_hash(hash_rects)
	hash_rects.each { |key,value|
		if value.collide_rect?+(self); return [key,value]; end
	}
	return nil
end

#collide_hash_all(hash_rects) ⇒ Object

Iterate through all key/value pairs in the given hash table, and return an Array of every pair whose value is a Rect that collides the caller.

Because a hash table is unordered, you should not expect the returned pairs to be in any particular order.



458
459
460
461
462
 
# File 'lib/rubygoo/rect.rb', line 458

def collide_hash_all(hash_rects)
	hash_rects.select { |key,value|
		value.collide_rect?+(self)
	}
end

#collide_point?(x, y) ⇒ Boolean

True if the point is inside (including on the border) of the caller. If you have Array of coordinates, you can use collide_point?(*coords).

Returns:

  • (Boolean) 


491
492
493
494
 
# File 'lib/rubygoo/rect.rb', line 491

def collide_point?(x,y)
	nself = normalize()
	x.between?(nself.left,nself.right) && y.between?(nself.top,nself.bottom)
end

#collide_rect?(rect) ⇒ Boolean

True if the caller and the given Rect overlap (or touch) at all.

Returns:

  • (Boolean) 


497
498
499
500
501
502
 
# File 'lib/rubygoo/rect.rb', line 497

def collide_rect?(rect)
	nself = self.normalize
	rect  = Rect.new_from_object(rect).normalize!
	return ((nself.l >= rect.l && nself.l <= rect.r) or (rect.l >= nself.l && rect.l <= nself.r)) &&
	       ((nself.t >= rect.t && nself.t <= rect.b) or (rect.t >= nself.t && rect.t <= nself.b))
end

#contain?(rect) ⇒ Boolean

True if the given Rect is totally within the caller. Borders may overlap.

Returns:

  • (Boolean) 


506
507
508
509
510
511
 
# File 'lib/rubygoo/rect.rb', line 506

def contain?(rect)
	nself = self.normalize
	rect = Rect.new_from_object(rect).normalize!
	return (nself.left <= rect.left and rect.right <= nself.right and
				nself.top <= rect.top and rect.bottom <= nself.bottom)
end

#h ⇒ Object Also known as: height

Returns self.at(3)



176
 
# File 'lib/rubygoo/rect.rb', line 176

def h; return self.at(3); end

#h=(val) ⇒ Object Also known as: height=

Sets self to val



178
 
# File 'lib/rubygoo/rect.rb', line 178

def h=(val); self[3] = val; end

#inflate(x, y) ⇒ Object

As #inflate!, but the original caller is not changed.



514
515
516
517
518
519
 
# File 'lib/rubygoo/rect.rb', line 514

def inflate(x,y)
	return self.class.new(self.at(0) - x.div(2),
												self.at(1) - y.div(2),
												self.at(2) + x,
												self.at(3) + y)
end

#inflate!(x, y) ⇒ Object

Increase the Rect’s size is the x and y directions, while keeping the same center point. For best results, expand by an even number. X and y inflation can be given as an Array or as separate values.



524
525
526
527
528
529
530
 
# File 'lib/rubygoo/rect.rb', line 524

def inflate!(x,y)
	self[0] -= x.div(2)
	self[1] -= y.div(2)
	self[2] += x
	self[3] += y
	return self
end

#inspect ⇒ Object

Print the Rect in the form “+#<Rect:id [x,y,w,h]>+”



141
 
# File 'lib/rubygoo/rect.rb', line 141

def inspect; "#<Rect:#{self.object_id} [%s,%s,%s,%s]>"%self; end

#midbottom ⇒ Object Also known as: mb

Return the x and y coordinates of the midpoint on the left side of the Rect.



349
 
# File 'lib/rubygoo/rect.rb', line 349

def midbottom; return self.centerx, self.bottom; end

#midbottom=(midbottom) ⇒ Object Also known as: mb=

Set the x and y coordinates of the midpoint on the bottom side of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


353
354
355
356
357
 
# File 'lib/rubygoo/rect.rb', line 353

def midbottom=(midbottom)
   	raise ArgumentError, "Rect#midbottom= takes an Array of form [x, y]." if midbottom.size != 2
	self.centerx, self.bottom = midbottom
	return midbottom
end

#midleft ⇒ Object Also known as: ml

Return the x and y coordinates of the midpoint on the left side of the Rect.



304
 
# File 'lib/rubygoo/rect.rb', line 304

def midleft; return self.at(0), self.centery; end

#midleft=(midleft) ⇒ Object Also known as: ml=

Set the x and y coordinates of the midpoint on the left side of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


308
309
310
311
312
 
# File 'lib/rubygoo/rect.rb', line 308

def midleft=(midleft)
   	raise ArgumentError, "Rect#midleft= takes an Array of form [x, y]." if midleft.size != 2
	self[0], self.centery = midleft
	return midleft
end

#midright ⇒ Object Also known as: mr

Return the x and y coordinates of the midpoint on the left side of the Rect.



334
 
# File 'lib/rubygoo/rect.rb', line 334

def midright; return self.right, self.centery; end

#midright=(midright) ⇒ Object Also known as: mr=

Set the x and y coordinates of the midpoint on the right side of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


338
339
340
341
342
 
# File 'lib/rubygoo/rect.rb', line 338

def midright=(midright)
   	raise ArgumentError, "Rect#midright= takes an Array of form [x, y]." if midright.size != 2
	self.right, self.centery = midright
	return midright
end

#midtop ⇒ Object Also known as: mt

Return the x and y coordinates of the midpoint on the left side of the Rect.



319
 
# File 'lib/rubygoo/rect.rb', line 319

def midtop; return self.centerx, self.at(1); end

#midtop=(midtop) ⇒ Object Also known as: mt=

Set the x and y coordinates of the midpoint on the top side of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


323
324
325
326
327
 
# File 'lib/rubygoo/rect.rb', line 323

def midtop=(midtop)
   	raise ArgumentError, "Rect#midtop= takes an Array of form [x, y]." if midtop.size != 2
	self.centerx, self[1] = midtop
	return midtop
end

#move(x, y) ⇒ Object

As #move!, but the original caller is not changed.



533
534
535
 
# File 'lib/rubygoo/rect.rb', line 533

def move(x,y)
	self.dup.move!(x,y)
end

#move!(x, y) ⇒ Object

Translate the Rect by the given amounts in the x and y directions. Positive values are rightward for x and downward for y. X and y movement can be given as an Array or as separate values.



540
541
542
543
 
# File 'lib/rubygoo/rect.rb', line 540

def move!(x,y)
	self[0]+=x; self[1]+=y
	return self
end

#normalize ⇒ Object

As #normalize!, but the original caller is not changed.



546
547
548
 
# File 'lib/rubygoo/rect.rb', line 546

def normalize
	self.dup.normalize!()
end

#normalize! ⇒ Object

Fix Rects that have negative width or height, without changing the area it represents. Has no effect on Rects with non-negative width and height. Some Rect methods will automatically normalize the Rect.



553
554
555
556
557
558
559
560
561
 
# File 'lib/rubygoo/rect.rb', line 553

def normalize!
	if self.at(2) < 0
		self[0], self[2] = self.at(0)+self.at(2), -self.at(2)
	end
	if self.at(3) < 0
		self[1], self[3] = self.at(1)+self.at(3), -self.at(3)
	end
	self
end

#right ⇒ Object Also known as: r

Return the x coordinate of the right side of the Rect.



194
 
# File 'lib/rubygoo/rect.rb', line 194

def right; return self.at(0)+self.at(2); end

#right=(r) ⇒ Object Also known as: r=

Set the x coordinate of the right side of the Rect by translating the Rect (adjusting the x offset).



198
 
# File 'lib/rubygoo/rect.rb', line 198

def right=(r); self[0] = r - self.at(2); return r; end

#size ⇒ Object

Return the width and height of the Rect.



184
 
# File 'lib/rubygoo/rect.rb', line 184

def size; return self[2,2]; end

#size=(size) ⇒ Object

Set the width and height of the Rect.

Raises:

  • (ArgumentError) 


187
188
189
190
191
 
# File 'lib/rubygoo/rect.rb', line 187

def size=(size)
 raise ArgumentError, "Rect#size= takes an Array of form [width, height]." if size.size != 2
 self[2,2] = size
 size
end

#to_s ⇒ Object

Print the Rect in the form “+#<Rect [x,y,w,h]>+”



138
 
# File 'lib/rubygoo/rect.rb', line 138

def to_s; "#<Rect [%s,%s,%s,%s]>"%self; end

#topleft ⇒ Object Also known as: tl

Return the x and y coordinates of the top-left corner of the Rect



247
 
# File 'lib/rubygoo/rect.rb', line 247

def topleft; return self[0,2].to_a; end

#topleft=(topleft) ⇒ Object Also known as: tl=

Set the x and y coordinates of the top-left corner of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


251
252
253
254
255
 
# File 'lib/rubygoo/rect.rb', line 251

def topleft=(topleft)
    raise ArgumentError, "Rect#topright= takes an Array of form [x, y]." if topleft.size != 2
	self[0,2] = topleft
	return topleft
end

#topright ⇒ Object Also known as: tr

Return the x and y coordinates of the top-right corner of the Rect



261
 
# File 'lib/rubygoo/rect.rb', line 261

def topright; return self.right, self.at(1); end

#topright=(topright) ⇒ Object Also known as: tr=

Set the x and y coordinates of the top-right corner of the Rect by translating the Rect (adjusting the x and y offsets).

Raises:

  • (ArgumentError) 


265
266
267
268
269
 
# File 'lib/rubygoo/rect.rb', line 265

def topright=(topright)
    raise ArgumentError, "Rect#topright= takes an Array of form [x, y]." if topright.size != 2
	self.right, self[1] = topright
	return topright
end

#union(rect) ⇒ Object

As #union!, but the original caller is not changed.



564
565
566
 
# File 'lib/rubygoo/rect.rb', line 564

def union(rect)
	self.dup.union!(rect)
end

#union!(rect) ⇒ Object

Expand the caller to also cover the given Rect. The Rect is still a rectangle, so it may also cover areas that neither of the original Rects did, for example areas between the two Rects.



571
572
573
574
575
576
577
578
579
580
581
582
583
584
 
# File 'lib/rubygoo/rect.rb', line 571

def union!(rect)
	self.normalize!
   rleft, rtop = self.topleft
   rright, rbottom = self.bottomright
	r2 = Rect.new_from_object(rect).normalize!

	rleft = [rleft, r2.left].min
	rtop = [rtop, r2.top].min
	rright = [rright, r2.right].max
	rbottom = [rbottom, r2.bottom].max

	self[0,4] = rleft, rtop, rright - rleft, rbottom - rtop
	return self
end

#union_all(array_rects) ⇒ Object

As #union_all!, but the original caller is not changed.



587
588
589
 
# File 'lib/rubygoo/rect.rb', line 587

def union_all(array_rects)
	self.dup.union_all!(array_rects)
end

#union_all!(array_rects) ⇒ Object

Expand the caller to cover all of the given Rects. See also #union!



592
593
594
595
596
597
 
# File 'lib/rubygoo/rect.rb', line 592

def union_all!(array_rects)
	array_rects.each do |r|
     self.union!(r)
	end
	return self
end

#w ⇒ Object Also known as: width

Returns self.at(2)



168
 
# File 'lib/rubygoo/rect.rb', line 168

def w; return self.at(2); end

#w=(val) ⇒ Object Also known as: width=

Sets self to val



170
 
# File 'lib/rubygoo/rect.rb', line 170

def w=(val); self[2] = val; end

#x ⇒ Object Also known as: left, l

Returns self.at(0)



148
 
# File 'lib/rubygoo/rect.rb', line 148

def x; return self.at(0); end

#x=(val) ⇒ Object Also known as: left=, l=

Sets self to val



150
 
# File 'lib/rubygoo/rect.rb', line 150

def x=(val); self[0] = val; end

#y ⇒ Object Also known as: top, t

Returns self.at(1)



158
 
# File 'lib/rubygoo/rect.rb', line 158

def y; return self.at(1); end

#y=(val) ⇒ Object Also known as: top=, t=

Sets self to val



160
 
# File 'lib/rubygoo/rect.rb', line 160

def y=(val); self[1] = val; end