Class: GeoTreeModule::DataPoint

Inherits:
Object
  • Object
show all
Defined in:
lib/geotree/datapoint.rb

Overview

Represents a point to be stored in a GeoTree.

A point has these fields.

A name, which is a unique integer identifier. This could be, e.g.,

the id of a larger database record associated with the point.

A position, stored as a Loc object (two integers, x and y).

A weight. This is an integer, and is unused by the GeoTree except that

the MultiTree class assumes that the lower 4 bits hold the point's
detail level (a lower value means the point is less likely to show
up at lower detail levels).

Constant Summary collapse

@@nextRndName = 
200

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, weight, loc) ⇒ DataPoint

Returns a new instance of DataPoint.



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# File 'lib/geotree/datapoint.rb', line 22

def initialize(name,weight,loc)
  @name = name
  @loc = loc
  @weight = weight
end

Instance Attribute Details

#loc ⇒ Object

Returns the value of attribute loc.



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# File 'lib/geotree/datapoint.rb', line 20

def loc
  @loc
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/geotree/datapoint.rb', line 20

def name
  @name
end

#weight ⇒ Object

Returns the value of attribute weight.



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# File 'lib/geotree/datapoint.rb', line 20

def weight
  @weight
end

Class Method Details

.match(a, b) ⇒ Object 



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# File 'lib/geotree/datapoint.rb', line 61

def self.match(a, b)
  a.name == b.name && a.loc.x == b.loc.x && a.loc.y == b.loc.y
end

.name_list(dp_list) ⇒ Object 



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# File 'lib/geotree/datapoint.rb', line 57

def self.name_list(dp_list)
  dp_list.map{|x| x.name}.sort
end

.rnd ⇒ Object

Construct a random point, one with a unique name (assumes no other process is generating point names)



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# File 'lib/geotree/datapoint.rb', line 43

def self.rnd
  wt = (rand() * rand() * MAX_POINT_WEIGHT).to_i
  x = rand(1000)
  y = rand(1000)
  @@nextRndName += 1
  DataPoint.new(@@nextRndName, wt, Loc.new(x,y))
end

.rnd_many(count) ⇒ Object 



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# File 'lib/geotree/datapoint.rb', line 51

def self.rnd_many(count)
  a = []
  count.times{a << self.rnd}
  a
end

Instance Method Details

#flip ⇒ Object 



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# File 'lib/geotree/datapoint.rb', line 28

def flip
  DataPoint.new(@name,@weight,@loc.flip)
end

#inspect ⇒ Object 



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# File 'lib/geotree/datapoint.rb', line 36

def inspect
  to_s
end

#to_s ⇒ Object 



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# File 'lib/geotree/datapoint.rb', line 32

def to_s
  "[##{name}: #{loc} w#{weight}]"
end