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https://github.com/MaSzyna-EU07/maszyna.git
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321c9dd7ab
The track layout library came in as a subproject of its own -- its own CMakeLists, its own install and export rules, its own include tree -- which only made the build harder to follow now that everything else is a module. It is part of the editor, so it lives where the editor lives. - editor/plan_*.cppm / plan_*.cpp: the fifteen interface units and twelve implementation units, flat in editor/ beside editorTerrain and orthophoto, with the plan_ prefix keeping them clear of what was already there (editor/turnouts is the preset catalogue, so the geometry is plan_turnout_geometry). - modules are named eu07.editor.plan_*, like every other module in the tree. - namespaces move under the editor's own: editor::plan, editor::plan::geometry, ::io, ::render. The library's old name is gone from the sources and the docs. - every moved file carries the MPL header the rest of the tree carries; it had none. version.hpp went with the subproject: macros only, and unused. - the umbrella header is dropped -- nothing imported it. - the unit tests survive the fold: editor/tests, behind EU07_EDITOR_PLAN_TESTS (off by default), compiles the interfaces a second time into a small library of its own, because a test can only import modules from a target it links and linking the game would drag the whole simulator in. The code under test needs nothing but a compiler. 7/7 pass. - a switch may now be written with two dashes as well: --editor beside -editor. Builds with clang 22 (-DWITH_BETTER_RENDERER=OFF); -editor and --editor both come up in the editor on empty ground.
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*
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This Source Code Form is subject to the
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terms of the Mozilla Public License, v.
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2.0. If a copy of the MPL was not
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distributed with this file, You can
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obtain one at
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http://mozilla.org/MPL/2.0/.
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*/
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module;
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#include <cstdint>
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#include <vector>
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#include <cmath>
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#include <cstddef>
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#include <utility>
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module eu07.editor.plan_rail_renderer;
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namespace editor::plan::render {
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namespace {
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// Offsets a centreline polyline sideways by @p dist metres (signed) along the
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// per-vertex normal. The vertex tangent uses a central difference of the
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// neighbours (forward/backward at the ends); the left normal of (dx, dy) is
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// (-dy, dx), matching the project's (east=x, north=y) convention.
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std::vector<Point> offset(const std::vector<Point>& pts, double dist) {
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const std::size_t m = pts.size();
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std::vector<Point> out(m);
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for (std::size_t i = 0; i < m; ++i) {
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double dx = 1.0, dy = 0.0;
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if (m >= 2) {
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if (i == 0) {
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dx = pts[1].x - pts[0].x;
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dy = pts[1].y - pts[0].y;
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} else if (i + 1 == m) {
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dx = pts[i].x - pts[i - 1].x;
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dy = pts[i].y - pts[i - 1].y;
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} else {
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dx = pts[i + 1].x - pts[i - 1].x;
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dy = pts[i + 1].y - pts[i - 1].y;
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}
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}
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const double len = std::hypot(dx, dy);
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const double nx = len > 0.0 ? -dy / len : 0.0;
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const double ny = len > 0.0 ? dx / len : 0.0;
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out[i] = Point{pts[i].x + nx * dist, pts[i].y + ny * dist};
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}
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return out;
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}
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} // namespace
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RailRenderer::RailRenderer(double gauge_metres) noexcept
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: half_gauge_{gauge_metres * 0.5} {}
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void RailRenderer::add(const CentrelineElement& element) {
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for (const double side : {half_gauge_, -half_gauge_}) {
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RailPolyline rail;
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rail.kind = element.kind;
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rail.element_id = element.element_id;
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rail.owner_id = element.owner_id;
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rail.from_turnout = element.from_turnout;
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rail.length = element.length;
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rail.radius_start = element.radius_start;
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rail.radius_end = element.radius_end;
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rail.points = offset(element.points, side);
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rails_.push_back(std::move(rail));
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}
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}
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} // namespace editor::plan::render
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