Add generic middle classes LinkStraight and LinkCurve

1 files changed, 28 insertions, 0 deletions

diff --git a/game/network/link.cpp b/game/network/link.cpp
index ad09341..e45126f 100644
--- a/game/network/link.cpp
+++ b/game/network/link.cpp
@@ -1,9 +1,13 @@
 #include "link.h"
 #include <compare>
+#include <location.hpp>
+#include <maths.h>
 #include <tuple>
 
 Link::Link(End a, End b, float l) : ends {{std::move(a), std::move(b)}}, length {l} { }
 
+LinkCurve::LinkCurve(glm::vec3 c, float r, Arc a) : centreBase {c}, radius {r}, arc {std::move(a)} { }
+
 bool
 operator<(const glm::vec3 & a, const glm::vec3 & b)
 {
@@ -16,3 +20,27 @@ operator<(const Node & a, const Node & b)
 {
 	return a.pos < b.pos;
 }
+
+Location
+LinkStraight::positionAt(float dist, unsigned char start) const
+{
+	const auto es {std::make_pair(ends[start].node.get(), ends[1 - start].node.get())};
+	const auto diff {es.second->pos - es.first->pos};
+	const auto dir {glm::normalize(diff)};
+	return Location {es.first->pos + vehiclePositionOffset() + dir * dist, {-vector_pitch(dir), vector_yaw(dir), 0}};
+}
+
+Location
+LinkCurve::positionAt(float dist, unsigned char start) const
+{
+	static constexpr std::array<float, 2> dirOffset {half_pi, -half_pi};
+	const auto frac {dist / length};
+	const auto es {std::make_pair(ends[start].node.get(), ends[1 - start].node.get())};
+	const auto as {std::make_pair(arc[start], arc[1 - start])};
+	const auto ang {as.first + ((as.second - as.first) * frac)};
+	const auto relPos {!sincosf(ang) * radius};
+	const auto relClimb {vehiclePositionOffset()
+			+ glm::vec3 {0, -centreBase.y + es.first->pos.y + ((es.second->pos.y - es.first->pos.y) * frac), 0}};
+	const auto pitch {vector_pitch({0, (es.first->pos.y - es.second->pos.y) / length, 0})};
+	return Location {relPos + relClimb + centreBase, {pitch, normalize(ang + dirOffset[start]), 0}};
+}