From d39c6dd18248927044d2f75cefd2ed8ba12eb3b7 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 9 Mar 2021 01:21:46 +0000
Subject: Make objectives responsible for navigation

---
 game/network/link.h          |  3 ++-
 game/objective.h             |  2 ++
 game/objectives/freeroam.cpp | 22 ++++++++++++++++++++++
 game/objectives/freeroam.h   | 12 +++++-------
 game/vehicles/vehicle.cpp    |  7 +++----
 5 files changed, 34 insertions(+), 12 deletions(-)
 create mode 100644 game/objectives/freeroam.cpp

(limited to 'game')

diff --git a/game/network/link.h b/game/network/link.h
index e541975..afb3900 100644
--- a/game/network/link.h
+++ b/game/network/link.h
@@ -44,7 +44,8 @@ public:
 	std::array<End, 2> ends;
 	float length;
 	using Next = std::pair<LinkWPtr, unsigned char /*end*/>;
-	std::array<std::vector<Next>, 2> nexts;
+	using Nexts = std::vector<Next>;
+	std::array<Nexts, 2> nexts;
 };
 
 bool operator<(const glm::vec3 & a, const glm::vec3 & b);
diff --git a/game/objective.h b/game/objective.h
index e4fd6d4..5b3690e 100644
--- a/game/objective.h
+++ b/game/objective.h
@@ -2,6 +2,7 @@
 #define OBJECTIVE_H
 
 #include "activity.h"
+#include "network/link.h"
 #include <memory>
 #include <special_members.hpp>
 
@@ -15,6 +16,7 @@ public:
 
 	[[nodiscard]] virtual Objective * complete() const;
 	[[nodiscard]] virtual ActivityPtr createActivity() const = 0;
+	[[nodiscard]] virtual Link::Next navigate(Link::Nexts::const_iterator, Link::Nexts::const_iterator) const = 0;
 
 	Orders * orders;
 };
diff --git a/game/objectives/freeroam.cpp b/game/objectives/freeroam.cpp
new file mode 100644
index 0000000..0721ef2
--- /dev/null
+++ b/game/objectives/freeroam.cpp
@@ -0,0 +1,22 @@
+#include "freeroam.h"
+#include <game/activities/go.h>
+#include <game/activity.h>
+#include <game/network/link.h>
+#include <iterator>
+#include <memory>
+#include <random>
+#include <vector>
+
+ActivityPtr
+FreeRoam::createActivity() const
+{
+	return std::make_unique<Go>();
+}
+
+Link::Next
+FreeRoam::navigate(Link::Nexts::const_iterator begin, Link::Nexts::const_iterator end) const
+{
+	static std::mt19937 gen(std::random_device {}());
+	auto off = std::uniform_int_distribution<>(0, std::distance(begin, end) - 1)(gen);
+	return begin[off];
+}
diff --git a/game/objectives/freeroam.h b/game/objectives/freeroam.h
index c97d9b4..2cfdcfc 100644
--- a/game/objectives/freeroam.h
+++ b/game/objectives/freeroam.h
@@ -1,18 +1,16 @@
 #ifndef FREEROAM_H
 #define FREEROAM_H
 
-#include "game/activities/go.h"
-#include "game/objective.h"
+#include <game/activity.h>
+#include <game/network/link.h>
+#include <game/objective.h>
 
 class FreeRoam : public Objective {
 public:
 	using Objective::Objective;
 
-	[[nodiscard]] ActivityPtr
-	createActivity() const override
-	{
-		return std::make_unique<Go>();
-	}
+	[[nodiscard]] ActivityPtr createActivity() const override;
+	[[nodiscard]] Link::Next navigate(Link::Nexts::const_iterator, Link::Nexts::const_iterator) const override;
 };
 
 #endif
diff --git a/game/vehicles/vehicle.cpp b/game/vehicles/vehicle.cpp
index db61564..e30cbf9 100644
--- a/game/vehicles/vehicle.cpp
+++ b/game/vehicles/vehicle.cpp
@@ -12,7 +12,6 @@
 #include <iterator>
 #include <location.hpp>
 #include <maths.h>
-#include <random>
 #include <utility>
 #include <vector>
 
@@ -26,7 +25,6 @@ Vehicle::Vehicle(const LinkPtr & l, float ld) : linkDist {ld}
 void
 Vehicle::move(TickDuration dur)
 {
-	static std::mt19937 gen(std::random_device {}());
 	linkDist += dur.count() * speed;
 	auto curLink {linkHist.getCurrent()};
 	while (linkDist > curLink.first->length) {
@@ -36,9 +34,10 @@ Vehicle::move(TickDuration dur)
 			return std::abs(normalize(n.first.lock()->ends[n.second].second - ang)) > 0.1F;
 		});
 		if (last != nexts.begin()) {
-			auto off = std::uniform_int_distribution<>(0, std::distance(nexts.begin(), last) - 1)(gen);
+			auto next = (std::distance(nexts.begin(), last) > 1) ? orders.current()->navigate(nexts.cbegin(), last)
+																 : nexts.front();
 			linkDist -= curLink.first->length;
-			curLink = linkHist.add(nexts[off].first, nexts[off].second);
+			curLink = linkHist.add(next.first, next.second);
 		}
 		else {
 			linkDist = curLink.first->length;
-- 
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