From e118b1f5d8071460e3a9d4d731c6d69221f785dc Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sat, 6 Mar 2021 19:44:58 +0000
Subject: Carve up the mess in game/vehicles

---
 game/vehicles/train.cpp | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 game/vehicles/train.cpp

(limited to 'game/vehicles/train.cpp')

diff --git a/game/vehicles/train.cpp b/game/vehicles/train.cpp
new file mode 100644
index 0000000..e211f16
--- /dev/null
+++ b/game/vehicles/train.cpp
@@ -0,0 +1,60 @@
+#include "train.h"
+#include "game/vehicles/linkHistory.h"
+#include "game/vehicles/railVehicle.h"
+#include "gfx/renderable.h"
+#include "location.hpp"
+#include <algorithm>
+#include <array>
+#include <functional>
+#include <glm/glm.hpp>
+#include <iterator>
+#include <maths.h>
+#include <random>
+#include <utility>
+
+void
+Train::move(TickDuration dur)
+{
+	static std::mt19937 gen(std::random_device {}());
+	linkDist += dur.count() * speed;
+	auto curLink {linkHist.getCurrent()};
+	while (linkDist > curLink.first->length) {
+		const auto location = curLink.first->positionAt(curLink.first->length, curLink.second);
+		auto nexts {curLink.first->nexts[1 - curLink.second]};
+		auto last = std::remove_if(nexts.begin(), nexts.end(), [ang = location.rot.y](const Link::Next & n) {
+			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);
+			linkDist -= curLink.first->length;
+			curLink = linkHist.add(nexts[off].first, nexts[off].second);
+		}
+		else {
+			linkDist = curLink.first->length;
+			speed = 0;
+		}
+	}
+}
+
+void
+Train::render(const Shader & shader) const
+{
+	apply(&Renderable::render, shader);
+}
+
+Location
+Train::getBogiePosition(float linkDist, float dist) const
+{
+	float b2linkDist {};
+	const auto b2Link = linkHist.getAt(dist - linkDist, &b2linkDist);
+	return b2Link.first->positionAt(b2linkDist, b2Link.second);
+}
+
+void
+Train::tick(TickDuration dur)
+{
+	move(dur);
+
+	float trailBy {0.F};
+	apply(&RailVehicle::move, this, std::ref(trailBy));
+}
-- 
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