From 382a533e9d3a03eed40f653516b62590396e2388 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sat, 13 Dec 2014 12:59:41 -0500
Subject: [PATCH 01/13] add pry to project

---
 multilateration.gemspec | 1 +
 spec/spec_helper.rb     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/multilateration.gemspec b/multilateration.gemspec
index 45d6c2d..a579df2 100644
--- a/multilateration.gemspec
+++ b/multilateration.gemspec
@@ -20,5 +20,6 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"
+  spec.add_development_dependency "pry"
   spec.add_development_dependency "rspec", "~> 3.0"
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2752f9f..2f32440 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,3 +1,4 @@
+require 'pry'
 require 'multilateration'
 
 # This file was generated by the `rspec --init` command. Conventionally, all

From a85676229079d7a9c02962af51bbc4aed43177f7 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sat, 13 Dec 2014 17:56:54 -0500
Subject: [PATCH 02/13] remove ---require spec_helper as it breaks rspec --seed
 in rspec 3.1

---
 .rspec | 1 -
 1 file changed, 1 deletion(-)

diff --git a/.rspec b/.rspec
index 83e16f8..4e1e0d2 100644
--- a/.rspec
+++ b/.rspec
@@ -1,2 +1 @@
 --color
---require spec_helper

From 57b63317b93c96c04e8195d045831c0e37c10819 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sat, 13 Dec 2014 18:43:55 -0500
Subject: [PATCH 03/13] Add rantly to the project

---
 lib/multilateration.rb  | 2 ++
 multilateration.gemspec | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/lib/multilateration.rb b/lib/multilateration.rb
index e7650a9..0e21668 100644
--- a/lib/multilateration.rb
+++ b/lib/multilateration.rb
@@ -1,3 +1,5 @@
+require "rantly"
+
 require "matrix"
 
 require "multilateration/version"
diff --git a/multilateration.gemspec b/multilateration.gemspec
index a579df2..465d11b 100644
--- a/multilateration.gemspec
+++ b/multilateration.gemspec
@@ -22,4 +22,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake"
   spec.add_development_dependency "pry"
   spec.add_development_dependency "rspec", "~> 3.0"
+
+  spec.add_dependency "rantly", "~> 0.3"
+
 end

From eb50da8570d294f3f2b6a507aa4f7d1303748acb Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sat, 13 Dec 2014 18:46:48 -0500
Subject: [PATCH 04/13] add Multilateration::SignalEventsGenerator class

---
 lib/multilateration.rb                        |  1 +
 .../signal_events_generator.rb                | 89 +++++++++++++++++++
 .../signal_events_generator_spec.rb           | 26 ++++++
 3 files changed, 116 insertions(+)
 create mode 100644 lib/multilateration/signal_events_generator.rb
 create mode 100644 spec/multilateration/signal_events_generator_spec.rb

diff --git a/lib/multilateration.rb b/lib/multilateration.rb
index 0e21668..23a6e9b 100644
--- a/lib/multilateration.rb
+++ b/lib/multilateration.rb
@@ -3,6 +3,7 @@
 require "matrix"
 
 require "multilateration/version"
+require "multilateration/signal_events_generator"
 require "multilateration/solver"
 require "multilateration/time_of_arrival_strategies/source_vector_distance"
 
diff --git a/lib/multilateration/signal_events_generator.rb b/lib/multilateration/signal_events_generator.rb
new file mode 100644
index 0000000..0a3f1fd
--- /dev/null
+++ b/lib/multilateration/signal_events_generator.rb
@@ -0,0 +1,89 @@
+module Multilateration
+  class SignalEventsGenerator
+
+    TIMESTAMP_FORMAT = "%Y-%m-%dT%H:%M:%S.%N%z"
+
+    def self.generate
+      begin
+        new(
+          receiver_count: 5,
+          coordinate_num_dimensions: 3,
+          coordinate_max_area: 1000,
+          coordinate_max_precision: 4,
+          signal_propagation_max_speed: 500,
+          signal_propagation_max_precision: 4,
+        ).generate
+      end
+    end
+
+    attr_reader :receiver_count, :coordinate_num_dimensions, :coordinate_max_area, :coordinate_max_precision, :signal_propagation_max_speed, :signal_propagation_max_precision
+    private :receiver_count, :coordinate_num_dimensions, :coordinate_max_area, :coordinate_max_precision, :signal_propagation_max_speed, :signal_propagation_max_precision
+
+    def initialize(receiver_count:, coordinate_num_dimensions:, coordinate_max_area:, coordinate_max_precision:, signal_propagation_max_speed:, signal_propagation_max_precision:)
+      @receiver_count                   = receiver_count
+      @coordinate_num_dimensions        = coordinate_num_dimensions
+      @coordinate_max_area              = coordinate_max_area
+      @coordinate_max_precision         = coordinate_max_precision
+      @signal_propagation_max_speed     = signal_propagation_max_speed
+      @signal_propagation_max_precision = signal_propagation_max_precision
+    end
+
+    def generate(rc: receiver_count)
+      signal_events = []
+
+      emission_timestamp   = random_high_resolution_timestamp
+      emitter_coordinate   = random_coordinate
+      receiver_coordinates = rc.times.map { random_coordinate }
+
+      signal_events << signal_event_for(:emitter, emitter_coordinate, emission_timestamp)
+
+      receiver_coordinates.each do |coordinate|
+        signal_events << signal_event_for(:receiver, coordinate, propagation_timestamp(emission_timestamp, emitter_coordinate, coordinate))
+      end
+
+      signal_events
+    end
+
+    private
+
+    def signal_event_for(type, coordinate, time)
+      {type: type, coordinate: coordinate, time: time}
+    end
+
+    def propagation_timestamp(emission_timestamp, emitter_coordinate, coordinate)
+      propagation_duration = distance_between_coordinates(emitter_coordinate, coordinate) / random_signal_propagation_speed
+      propagation_time     = timestamp_to_time(emission_timestamp) - propagation_duration
+      time_to_timestamp(propagation_time)
+    end
+
+    def distance_between_coordinates(coordinate1, coordinate2)
+      vector1 = coordinate_to_vector(coordinate1)
+      vector2 = coordinate_to_vector(coordinate2)
+      Math.sqrt((vector1 - vector2).map { |component| component.abs**2 }.reduce(&:+))
+    end
+
+    def random_signal_propagation_speed(spms: signal_propagation_max_speed, spmp: signal_propagation_max_precision)
+      Rantly { range(1, spms) + float.round(range(0, spmp)) }
+    end
+
+    def random_high_resolution_timestamp
+      time_to_timestamp Time.at(Rantly { integer(1_000_000_000) + float })
+    end
+
+    def random_coordinate(cnd: coordinate_num_dimensions, cma: coordinate_max_area, cmp: coordinate_max_precision)
+      Rantly(cnd) { range(-cma, cma) + float.round(range(0, cmp)) }
+    end
+
+    def coordinate_to_vector(coordinate)
+      Vector.elements(coordinate)
+    end
+
+    def time_to_timestamp(time)
+      time.utc.strftime(TIMESTAMP_FORMAT)
+    end
+
+    def timestamp_to_time(timestamp)
+      Time.parse(timestamp).utc
+    end
+  end
+end
diff --git a/spec/multilateration/signal_events_generator_spec.rb b/spec/multilateration/signal_events_generator_spec.rb
new file mode 100644
index 0000000..a543a36
--- /dev/null
+++ b/spec/multilateration/signal_events_generator_spec.rb
@@ -0,0 +1,26 @@
+require 'spec_helper'
+
+describe Multilateration::SignalEventsGenerator do
+  describe '.generate' do
+    subject(:generate) { described_class.generate }
+
+    let(:signal_event_matcher) do
+      {
+        coordinate: [be_a(Numeric), be_a(Numeric), be_a(Numeric)],        # [368, -454, 978.9]
+        time: match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}\+0{4}$/) # "1945-12-22T18:13:16.144102423+0000"
+      }
+    end
+
+    let(:signal_event_emitter_matcher) { signal_event_matcher.merge(type: :emitter) }
+    let(:signal_event_receiver_matcher) { signal_event_matcher.merge(type: :receiver) }
+
+    specify { expect(generate).to match [
+        signal_event_emitter_matcher,
+        signal_event_receiver_matcher,
+        signal_event_receiver_matcher,
+        signal_event_receiver_matcher,
+        signal_event_receiver_matcher,
+        signal_event_receiver_matcher,
+    ] }
+  end
+end

From 45c3001b6043c4ac88abe075005442cf03725736 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sat, 13 Dec 2014 18:49:54 -0500
Subject: [PATCH 05/13] remove unused begin statment

---
 lib/multilateration/signal_events_generator.rb | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/lib/multilateration/signal_events_generator.rb b/lib/multilateration/signal_events_generator.rb
index 0a3f1fd..cb92151 100644
--- a/lib/multilateration/signal_events_generator.rb
+++ b/lib/multilateration/signal_events_generator.rb
@@ -4,16 +4,14 @@ class SignalEventsGenerator
     TIMESTAMP_FORMAT = "%Y-%m-%dT%H:%M:%S.%N%z"
 
     def self.generate
-      begin
-        new(
-          receiver_count: 5,
-          coordinate_num_dimensions: 3,
-          coordinate_max_area: 1000,
-          coordinate_max_precision: 4,
-          signal_propagation_max_speed: 500,
-          signal_propagation_max_precision: 4,
-        ).generate
-      end
+      new(
+        receiver_count: 5,
+        coordinate_num_dimensions: 3,
+        coordinate_max_area: 1000,
+        coordinate_max_precision: 4,
+        signal_propagation_max_speed: 500,
+        signal_propagation_max_precision: 4,
+      ).generate
     end
 
     attr_reader :receiver_count, :coordinate_num_dimensions, :coordinate_max_area, :coordinate_max_precision, :signal_propagation_max_speed, :signal_propagation_max_precision

From 0a8b2de33e9e35aa4b0fe093de74399bf809dfe6 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 20:00:19 -0500
Subject: [PATCH 06/13] remove the explicit conversion to utc

---
 lib/multilateration/signal_events_generator.rb       | 4 ++--
 spec/multilateration/signal_events_generator_spec.rb | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/multilateration/signal_events_generator.rb b/lib/multilateration/signal_events_generator.rb
index cb92151..2577471 100644
--- a/lib/multilateration/signal_events_generator.rb
+++ b/lib/multilateration/signal_events_generator.rb
@@ -77,11 +77,11 @@ def coordinate_to_vector(coordinate)
     end
 
     def time_to_timestamp(time)
-      time.utc.strftime(TIMESTAMP_FORMAT)
+      time.strftime(TIMESTAMP_FORMAT)
     end
 
     def timestamp_to_time(timestamp)
-      Time.parse(timestamp).utc
+      Time.parse(timestamp)
     end
   end
 end
diff --git a/spec/multilateration/signal_events_generator_spec.rb b/spec/multilateration/signal_events_generator_spec.rb
index a543a36..985e8bf 100644
--- a/spec/multilateration/signal_events_generator_spec.rb
+++ b/spec/multilateration/signal_events_generator_spec.rb
@@ -7,7 +7,7 @@
     let(:signal_event_matcher) do
       {
         coordinate: [be_a(Numeric), be_a(Numeric), be_a(Numeric)],        # [368, -454, 978.9]
-        time: match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}\+0{4}$/) # "1945-12-22T18:13:16.144102423+0000"
+        time: match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}(\+|\-)\d{4}$/) # "1945-12-22T18:13:16.144102423+0000"
       }
     end
 

From b50724c5007a655020edf15bfa02b13404d95d1d Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 20:02:06 -0500
Subject: [PATCH 07/13] update the data structure that #generate outputs

---
 .../signal_events_generator.rb                | 33 +++++++++----------
 .../signal_events_generator_spec.rb           | 18 ++++------
 2 files changed, 22 insertions(+), 29 deletions(-)

diff --git a/lib/multilateration/signal_events_generator.rb b/lib/multilateration/signal_events_generator.rb
index 2577471..8a08820 100644
--- a/lib/multilateration/signal_events_generator.rb
+++ b/lib/multilateration/signal_events_generator.rb
@@ -27,29 +27,28 @@ def initialize(receiver_count:, coordinate_num_dimensions:, coordinate_max_area:
     end
 
     def generate(rc: receiver_count)
-      signal_events = []
-
-      emission_timestamp   = random_high_resolution_timestamp
-      emitter_coordinate   = random_coordinate
-      receiver_coordinates = rc.times.map { random_coordinate }
-
-      signal_events << signal_event_for(:emitter, emitter_coordinate, emission_timestamp)
-
-      receiver_coordinates.each do |coordinate|
-        signal_events << signal_event_for(:receiver, coordinate, propagation_timestamp(emission_timestamp, emitter_coordinate, coordinate))
-      end
-
-      signal_events
+      signal_propagation_speed = random_signal_propagation_speed
+      emission_timestamp       = random_high_resolution_timestamp
+      emitter_coordinate       = random_coordinate
+      receiver_coordinates     = rc.times.map { random_coordinate }
+
+      {
+        signal_propagation_speed: signal_propagation_speed,
+        emitter_event: signal_event_for(emitter_coordinate, emission_timestamp),
+        receiver_events: receiver_coordinates.map { |coordinate|
+          signal_event_for(coordinate, propagation_timestamp(signal_propagation_speed, emission_timestamp, emitter_coordinate, coordinate))
+        },
+      }
     end
 
     private
 
-    def signal_event_for(type, coordinate, time)
-      {type: type, coordinate: coordinate, time: time}
+    def signal_event_for(coordinate, timestamp)
+      {coordinate: coordinate, timestamp: timestamp}
     end
 
-    def propagation_timestamp(emission_timestamp, emitter_coordinate, coordinate)
-      propagation_duration = distance_between_coordinates(emitter_coordinate, coordinate) / random_signal_propagation_speed
+    def propagation_timestamp(signal_propagation_speed, emission_timestamp, emitter_coordinate, coordinate)
+      propagation_duration = distance_between_coordinates(emitter_coordinate, coordinate) / signal_propagation_speed
       propagation_time     = timestamp_to_time(emission_timestamp) - propagation_duration
       time_to_timestamp(propagation_time)
     end
diff --git a/spec/multilateration/signal_events_generator_spec.rb b/spec/multilateration/signal_events_generator_spec.rb
index 985e8bf..7e4b4de 100644
--- a/spec/multilateration/signal_events_generator_spec.rb
+++ b/spec/multilateration/signal_events_generator_spec.rb
@@ -7,20 +7,14 @@
     let(:signal_event_matcher) do
       {
         coordinate: [be_a(Numeric), be_a(Numeric), be_a(Numeric)],        # [368, -454, 978.9]
-        time: match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}(\+|\-)\d{4}$/) # "1945-12-22T18:13:16.144102423+0000"
+        timestamp: match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}(\+|\-)\d{4}$/) # "1945-12-22T18:13:16.144102423+0000"
       }
     end
 
-    let(:signal_event_emitter_matcher) { signal_event_matcher.merge(type: :emitter) }
-    let(:signal_event_receiver_matcher) { signal_event_matcher.merge(type: :receiver) }
-
-    specify { expect(generate).to match [
-        signal_event_emitter_matcher,
-        signal_event_receiver_matcher,
-        signal_event_receiver_matcher,
-        signal_event_receiver_matcher,
-        signal_event_receiver_matcher,
-        signal_event_receiver_matcher,
-    ] }
+    specify { expect(generate).to match(
+      signal_propagation_speed: be_a(Numeric),
+      emitter_event: signal_event_matcher,
+      receiver_events: [signal_event_matcher,signal_event_matcher,signal_event_matcher,signal_event_matcher,signal_event_matcher],
+    )}
   end
 end

From 3ea13834d88c0bc3f9513a2fc7af2d3449d13103 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 21:12:56 -0500
Subject: [PATCH 08/13] rename signal_events_generator to
 signal_event_data_generator

---
 lib/multilateration.rb                           |  2 +-
 ...nerator.rb => signal_event_data_generator.rb} | 16 ++++------------
 ...ec.rb => signal_event_data_generator_spec.rb} |  5 +++--
 3 files changed, 8 insertions(+), 15 deletions(-)
 rename lib/multilateration/{signal_events_generator.rb => signal_event_data_generator.rb} (87%)
 rename spec/multilateration/{signal_events_generator_spec.rb => signal_event_data_generator_spec.rb} (72%)

diff --git a/lib/multilateration.rb b/lib/multilateration.rb
index 23a6e9b..b90c088 100644
--- a/lib/multilateration.rb
+++ b/lib/multilateration.rb
@@ -3,7 +3,7 @@
 require "matrix"
 
 require "multilateration/version"
-require "multilateration/signal_events_generator"
+require "multilateration/signal_event_data_generator"
 require "multilateration/solver"
 require "multilateration/time_of_arrival_strategies/source_vector_distance"
 
diff --git a/lib/multilateration/signal_events_generator.rb b/lib/multilateration/signal_event_data_generator.rb
similarity index 87%
rename from lib/multilateration/signal_events_generator.rb
rename to lib/multilateration/signal_event_data_generator.rb
index 8a08820..b9de697 100644
--- a/lib/multilateration/signal_events_generator.rb
+++ b/lib/multilateration/signal_event_data_generator.rb
@@ -1,5 +1,5 @@
 module Multilateration
-  class SignalEventsGenerator
+  class SignalEventDataGenerator
 
     TIMESTAMP_FORMAT = "%Y-%m-%dT%H:%M:%S.%N%z"
 
@@ -44,13 +44,12 @@ def generate(rc: receiver_count)
     private
 
     def signal_event_for(coordinate, timestamp)
-      {coordinate: coordinate, timestamp: timestamp}
+      {coordinate: coordinate, time: timestamp}
     end
 
     def propagation_timestamp(signal_propagation_speed, emission_timestamp, emitter_coordinate, coordinate)
       propagation_duration = distance_between_coordinates(emitter_coordinate, coordinate) / signal_propagation_speed
-      propagation_time     = timestamp_to_time(emission_timestamp) - propagation_duration
-      time_to_timestamp(propagation_time)
+      propagation_time     = emission_timestamp - propagation_duration
     end
 
     def distance_between_coordinates(coordinate1, coordinate2)
@@ -64,7 +63,7 @@ def random_signal_propagation_speed(spms: signal_propagation_max_speed, spmp: si
     end
 
     def random_high_resolution_timestamp
-      time_to_timestamp Time.at(Rantly { integer(1_000_000_000) + float })
+      Time.at(Rantly { integer(1_000_000_000) + float })
     end
 
     def random_coordinate(cnd: coordinate_num_dimensions, cma: coordinate_max_area, cmp: coordinate_max_precision)
@@ -75,12 +74,5 @@ def coordinate_to_vector(coordinate)
       Vector.elements(coordinate)
     end
 
-    def time_to_timestamp(time)
-      time.strftime(TIMESTAMP_FORMAT)
-    end
-
-    def timestamp_to_time(timestamp)
-      Time.parse(timestamp)
-    end
   end
 end
diff --git a/spec/multilateration/signal_events_generator_spec.rb b/spec/multilateration/signal_event_data_generator_spec.rb
similarity index 72%
rename from spec/multilateration/signal_events_generator_spec.rb
rename to spec/multilateration/signal_event_data_generator_spec.rb
index 7e4b4de..ff5f8cf 100644
--- a/spec/multilateration/signal_events_generator_spec.rb
+++ b/spec/multilateration/signal_event_data_generator_spec.rb
@@ -1,13 +1,14 @@
 require 'spec_helper'
 
-describe Multilateration::SignalEventsGenerator do
+describe Multilateration::SignalEventDataGenerator do
   describe '.generate' do
     subject(:generate) { described_class.generate }
 
     let(:signal_event_matcher) do
       {
         coordinate: [be_a(Numeric), be_a(Numeric), be_a(Numeric)],        # [368, -454, 978.9]
-        timestamp: match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}(\+|\-)\d{4}$/) # "1945-12-22T18:13:16.144102423+0000"
+        # timestamp: match(/^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{9}(\+|\-)\d{4}$/) # "1945-12-22T18:13:16.144102423+0000"
+        time: be_a(Time),
       }
     end
 

From e3e64c81172d0be409d29892a010ebb5b99cb1c6 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 21:13:52 -0500
Subject: [PATCH 09/13] add SignalEvent class

---
 lib/multilateration.rb              |  1 +
 lib/multilateration/signal_event.rb | 46 +++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 lib/multilateration/signal_event.rb

diff --git a/lib/multilateration.rb b/lib/multilateration.rb
index b90c088..9614ee8 100644
--- a/lib/multilateration.rb
+++ b/lib/multilateration.rb
@@ -4,6 +4,7 @@
 
 require "multilateration/version"
 require "multilateration/signal_event_data_generator"
+require "multilateration/signal_event"
 require "multilateration/solver"
 require "multilateration/time_of_arrival_strategies/source_vector_distance"
 
diff --git a/lib/multilateration/signal_event.rb b/lib/multilateration/signal_event.rb
new file mode 100644
index 0000000..7fa2c4a
--- /dev/null
+++ b/lib/multilateration/signal_event.rb
@@ -0,0 +1,46 @@
+module Multilateration
+  class SignalEvent
+    include Comparable
+
+    attr_reader :coordinate, :time
+    private :coordinate, :time
+
+    def initialize(coordinate:, time:)
+      @coordinate = coordinate
+      @time       = time
+    end
+
+    def to_h
+      {coordinate: coordinate, time:  time}
+    end
+
+    def <=>(other)
+      time_of_arrival <=> other.time_of_arrival
+    end
+
+    def -(other)
+      vector - other.vector
+    end
+
+    def inner_product_sq
+      vector.inner_product(vector)
+    end
+
+    def time_difference_of_arrival(other)
+      time_of_arrival - other.time_of_arrival
+    end
+
+    def time_of_arrival
+      time
+    end
+
+    def distance_between(coordinate)
+      Math.sqrt((vector - Vector.elements(coordinate)).map { |component| component.abs**2 }.reduce(&:+))
+    end
+
+    protected def vector
+      @vector ||= Vector.elements(coordinate)
+    end
+
+  end
+end

From fa02842e7f875196954526122a0a8fd26a3e72c9 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 21:14:25 -0500
Subject: [PATCH 10/13] add generative gem to project

---
 multilateration.gemspec | 1 +
 spec/spec_helper.rb     | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/multilateration.gemspec b/multilateration.gemspec
index 465d11b..a13b77e 100644
--- a/multilateration.gemspec
+++ b/multilateration.gemspec
@@ -22,6 +22,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake"
   spec.add_development_dependency "pry"
   spec.add_development_dependency "rspec", "~> 3.0"
+  spec.add_development_dependency "generative", "~> 0.2"
 
   spec.add_dependency "rantly", "~> 0.3"
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 2f32440..4822d34 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,4 +1,6 @@
 require 'pry'
+require 'generative'
+
 require 'multilateration'
 
 # This file was generated by the `rspec --init` command. Conventionally, all

From c3b621d17fa0686199167dc1cf6998c7f59701f8 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 21:16:05 -0500
Subject: [PATCH 11/13] update Solver class to accept data from
 SignalEventDataGenerator

---
 lib/multilateration/solver.rb       | 35 +++++++++++++++--------------
 spec/multilateration/solver_spec.rb | 31 ++++++++++++++++---------
 2 files changed, 38 insertions(+), 28 deletions(-)

diff --git a/lib/multilateration/solver.rb b/lib/multilateration/solver.rb
index 46f8dd3..0df835e 100644
--- a/lib/multilateration/solver.rb
+++ b/lib/multilateration/solver.rb
@@ -1,20 +1,25 @@
 module Multilateration
   class Solver
-    attr_reader :receivers, :wave_speed, :time_of_arrival_strategy
-    private :receivers, :wave_speed, :time_of_arrival_strategy
+    attr_reader :receivers, :signal_propagation_speed
+    private :receivers, :signal_propagation_speed
 
-    def initialize(unsorted_receivers, time_of_arrival_strategy)
-      @receivers  = unsorted_receivers.sort_by { |r| time_of_arrival_strategy.toa(r) }
-      @wave_speed = time_of_arrival_strategy.wave_speed
-      @time_of_arrival_strategy = time_of_arrival_strategy
+    def initialize(receiver_events:, signal_propagation_speed:)
+      @receivers  = receiver_events.map {|e| SignalEvent.new(e) }.sort
+      @signal_propagation_speed = signal_propagation_speed
     end
 
-    def solved_vector
-      Vector.elements (ai_matrix * bi_matrix).flat_map.to_a
+    def solved_signal_event_emitter
+      time_between = first_receiver.distance_between(solved_coordinate) / signal_propagation_speed
+      solved_time  = (first_receiver.time_of_arrival + time_between)
+      SignalEvent.new(coordinate: solved_coordinate, time: solved_time).to_h
     end
 
     private
 
+    def solved_coordinate
+      (ai_matrix * bi_matrix).flat_map.to_a
+    end
+
     def ai_matrix
       Matrix.rows(middle_receivers.map { |i| ai(i) }).inverse
     end
@@ -29,9 +34,9 @@ def ai(i)
     end
 
     def bi(i)
-        ( distance(tdoa_between_receivers_first_and(i))   * ( distance_sq(tdoa_between_receivers_first_and_last) - inner_product_sq(last_receiver)                  )) \
-      + ( inner_product_sq(first_receiver)                * ( distance(tdoa_between_receivers_first_and(i))      - distance(tdoa_between_receivers_first_and_last)  )) \
-      + ( distance(tdoa_between_receivers_first_and_last) * ( inner_product_sq(i)                                - distance_sq(tdoa_between_receivers_first_and(i)) ))
+        ( distance(tdoa_between_receivers_first_and(i))   * ( distance_sq(tdoa_between_receivers_first_and_last) - last_receiver.inner_product_sq                   )) \
+      + ( first_receiver.inner_product_sq                 * ( distance(tdoa_between_receivers_first_and(i))      - distance(tdoa_between_receivers_first_and_last)  )) \
+      + ( distance(tdoa_between_receivers_first_and_last) * ( i.inner_product_sq                                 - distance_sq(tdoa_between_receivers_first_and(i)) ))
     end
 
     def middle_receivers
@@ -51,20 +56,16 @@ def tdoa_between_receivers_first_and_last
     end
 
     def tdoa_between_receivers_first_and(other_receiver)
-      time_of_arrival_strategy.tdoa(other_receiver, first_receiver)
+      first_receiver.time_difference_of_arrival(other_receiver)
     end
 
     def distance(time, exp=1)
-      (wave_speed**exp) * (time**exp)
+      (signal_propagation_speed**exp) * (time**exp)
     end
 
     def distance_sq(time)
       distance(time, 2)
     end
 
-    def inner_product_sq(vector)
-      vector.inner_product(vector)
-    end
-
   end
 end
diff --git a/spec/multilateration/solver_spec.rb b/spec/multilateration/solver_spec.rb
index d16f933..56a5aba 100644
--- a/spec/multilateration/solver_spec.rb
+++ b/spec/multilateration/solver_spec.rb
@@ -1,18 +1,27 @@
 require 'spec_helper'
 
 describe Multilateration::Solver do
-  describe "#solved_vector" do
-    let(:source_vector)    { Vector[-20,5,120.2]   }
-    let(:reciver_vector_0) { Vector[0,25,1]        }
-    let(:reciver_vector_1) { Vector[50,20.34,2]    }
-    let(:reciver_vector_2) { Vector[50,50,33]      }
-    let(:reciver_vector_3) { Vector[23,75,4]       }
-    let(:reciver_vector_4) { Vector[100,-100,-5.5] }
-    let(:time_of_arrival_strategy) { Multilateration::TimeOfArrivalStrategies::SourceVectorDistance.new(source_vector) }
-    let(:recivers) { [reciver_vector_0, reciver_vector_1, reciver_vector_2, reciver_vector_3, reciver_vector_4] }
+  describe "#solved_signal_event_emitter" do
+    generative do
+      let(:tolerance) { 0.0000001 }
 
-    subject(:solved_vector) { described_class.new(recivers, time_of_arrival_strategy).solved_vector }
+      let(:signal_event_data) { Multilateration::SignalEventDataGenerator.generate }
+      let(:signal_event_emiter) { signal_event_data.fetch(:emitter_event) }
+      let(:signal_event_emiter_time) { signal_event_emiter[:time] }
+      let(:signal_event_emiter_coordinate) { signal_event_emiter[:coordinate] }
+      let(:signal_event_data_without_emiter) { signal_event_data.reject { |k,v| v == signal_event_emiter } }
 
-    specify { expect( solved_vector.magnitude ).to be_within(0.0000000000001).of(source_vector.magnitude) }
+      subject(:solved_signal_event_emitter) { described_class.new(signal_event_data_without_emiter).solved_signal_event_emitter }
+
+      specify { expect(solved_signal_event_emitter).to match({
+        coordinate: [
+          be_within(tolerance).of(signal_event_emiter_coordinate[0]),
+          be_within(tolerance).of(signal_event_emiter_coordinate[1]),
+          be_within(tolerance).of(signal_event_emiter_coordinate[2]),
+        ],
+        time: be_within(tolerance).of(signal_event_emiter_time),
+      })}
+    end
   end
+
 end

From fc75c91b4e78a40006d1565d44658cead9233de5 Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 21:16:23 -0500
Subject: [PATCH 12/13] remove old
 TimeOfArrivalStrategies::SourceVectorDistance

---
 lib/multilateration.rb                        |  1 -
 .../source_vector_distance.rb                 | 27 -------------------
 .../source_vector_distance_spec.rb            |  4 ---
 3 files changed, 32 deletions(-)
 delete mode 100644 lib/multilateration/time_of_arrival_strategies/source_vector_distance.rb
 delete mode 100644 spec/multilateration/time_of_arrival_strategies/source_vector_distance_spec.rb

diff --git a/lib/multilateration.rb b/lib/multilateration.rb
index 9614ee8..8fb569f 100644
--- a/lib/multilateration.rb
+++ b/lib/multilateration.rb
@@ -6,7 +6,6 @@
 require "multilateration/signal_event_data_generator"
 require "multilateration/signal_event"
 require "multilateration/solver"
-require "multilateration/time_of_arrival_strategies/source_vector_distance"
 
 module Multilateration
   # Your code goes here...
diff --git a/lib/multilateration/time_of_arrival_strategies/source_vector_distance.rb b/lib/multilateration/time_of_arrival_strategies/source_vector_distance.rb
deleted file mode 100644
index 242a3c8..0000000
--- a/lib/multilateration/time_of_arrival_strategies/source_vector_distance.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-module Multilateration
-  module TimeOfArrivalStrategies
-    class SourceVectorDistance
-      attr_reader :source_vector, :wave_speed
-      private :source_vector
-
-      def initialize(source_vector, wave_speed=1)
-        @source_vector = source_vector
-        @wave_speed    = wave_speed
-      end
-
-      def tdoa(vector_a, vector_b)
-        toa(vector_a) - toa(vector_b)
-      end
-
-      def toa(target_vector)
-        distance_between_source_vector_and(target_vector) / wave_speed
-      end
-
-      private
-
-      def distance_between_source_vector_and(target_vector)
-        Math.sqrt((target_vector - source_vector).map { |component| component.abs**2 }.reduce(&:+))
-      end
-    end
-  end
-end
diff --git a/spec/multilateration/time_of_arrival_strategies/source_vector_distance_spec.rb b/spec/multilateration/time_of_arrival_strategies/source_vector_distance_spec.rb
deleted file mode 100644
index 3fa80ee..0000000
--- a/spec/multilateration/time_of_arrival_strategies/source_vector_distance_spec.rb
+++ /dev/null
@@ -1,4 +0,0 @@
-require 'spec_helper'
-
-describe Multilateration::TimeOfArrivalStrategies::SourceVectorDistance do
-end

From 3c0ec83aa057090d4a80ad6fca855eea6356aa7c Mon Sep 17 00:00:00 2001
From: Arron Mabrey <arron@mabreys.com>
Date: Sun, 14 Dec 2014 21:17:05 -0500
Subject: [PATCH 13/13] remove unused TIMESTAMP_FORMAT

---
 lib/multilateration/signal_event_data_generator.rb | 2 --
 1 file changed, 2 deletions(-)

diff --git a/lib/multilateration/signal_event_data_generator.rb b/lib/multilateration/signal_event_data_generator.rb
index b9de697..abace4c 100644
--- a/lib/multilateration/signal_event_data_generator.rb
+++ b/lib/multilateration/signal_event_data_generator.rb
@@ -1,8 +1,6 @@
 module Multilateration
   class SignalEventDataGenerator
 
-    TIMESTAMP_FORMAT = "%Y-%m-%dT%H:%M:%S.%N%z"
-
     def self.generate
       new(
         receiver_count: 5,