diff options
Diffstat (limited to 'game/network/rail.cpp')
| -rw-r--r-- | game/network/rail.cpp | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/game/network/rail.cpp b/game/network/rail.cpp index 4e09e29..a765a4f 100644 --- a/game/network/rail.cpp +++ b/game/network/rail.cpp @@ -8,6 +8,7 @@ #include <gfx/models/texture.h> #include <gfx/models/vertex.hpp> #include <glm/gtx/transform.hpp> +#include <glm/gtx/vector_angle.hpp> #include <maths.h> #include <type_traits> #include <utility> @@ -95,6 +96,15 @@ RailLinkStraight::RailLinkStraight(NodePtr a, NodePtr b, const glm::vec3 & diff) defaultMesh(); } +Transform +RailLinkStraight::positionAt(float dist, unsigned char start) const +{ + const auto es {std::make_pair(ends[start].first, ends[1 - start].first)}; + const auto diff {es.second->pos - es.first->pos}; + const auto dir {glm::normalize(diff)}; + return Transform {es.first->pos + dir * dist, {0, flat_angle(diff) /*, std::atan2(diff.x, -diff.z)*/, 0}}; +} + RailLinkCurve::RailLinkCurve(const NodePtr & a, const NodePtr & b, glm::vec2 c) : RailLinkCurve(a, b, {c.x, a->pos.y, c.y}, {!c, a->pos, b->pos}) { @@ -124,3 +134,19 @@ RailLinkCurve::RailLinkCurve(const NodePtr & a, const NodePtr & b, glm::vec3 c, } defaultMesh(); } + +Transform +RailLinkCurve::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].first, ends[1 - start].first)}; + const auto as {std::make_pair(arc[start], arc[1 - start])}; + const auto ang {as.first + ((as.second - as.first) * frac)}; + const auto angArc {ang - half_pi}; + const auto relPos {glm::vec3 {std::cos(angArc), 0, -std::sin(angArc)} * radius}; + const auto relClimb { + glm::vec3 {0, -centreBase.y + es.first->pos.y + ((es.second->pos.y - es.first->pos.y) * frac), 0}}; + + return Transform {relPos + relClimb + centreBase, {0, normalize(ang + dirOffset[start]), 0}}; +} |