Class: Pxlsrt::Spiral

Inherits:
Object
  • Object
show all
Defined in:
lib/pxlsrt/spiral.rb

Overview

Spiral iteration.

Instance Method Summary collapse

Constructor Details

#initialize(x, y) ⇒ Spiral

Returns a new instance of Spiral.



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# File 'lib/pxlsrt/spiral.rb', line 5

def initialize(x, y)
	@x = x
	@y = y
	@direction = "up"
	@step = 1
	@at = 0
	@count = 0
	@cycles = -1
end

Instance Method Details

#count ⇒ Object

Return amount iterated.



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# File 'lib/pxlsrt/spiral.rb', line 31

def count
	return @count
end

#cycles ⇒ Object

Return cycles gone through completely.



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# File 'lib/pxlsrt/spiral.rb', line 36

def cycles
	return @cycles
end

#direction ⇒ Object

Return current direction.



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# File 'lib/pxlsrt/spiral.rb', line 26

def direction
	return @direction
end

#next ⇒ Object

Goes to next position. Returns position.



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# File 'lib/pxlsrt/spiral.rb', line 46

def next
	case @direction
	when "left"
		@x -= 1
		@at += 1
		if @at == @step
			@direction = "down"
			@at = 0
			@step += 1
		end
	when "down"
		@y += 1
		@at += 1
		if @at == @step
			@direction = "right"
			@at = 0
		end
	when "right"
		@x += 1
		@at += 1
		if @at == @step
			@direction = "up"
			@at = 0
			@step += 1
		end
	when "up"
		@cycles += 1 if @at == 0
		@y -= 1
		@at += 1
		if @at == @step
			@direction = "left"
			@at = 0
		end
	end
	@count += 1
	return pos
end

#pos ⇒ Object

Return current position.



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# File 'lib/pxlsrt/spiral.rb', line 41

def pos
	return {:x => @x, :y => @y}
end

#x ⇒ Object

Return current x value.



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# File 'lib/pxlsrt/spiral.rb', line 16

def x
	return @x
end

#y ⇒ Object

Return current y value.



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# File 'lib/pxlsrt/spiral.rb', line 21

def y
	return @y
end