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Code Issues 157 Wiki Activity

Add a track layout drawing board to the editor

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A "Plan" panel, opened from Track layout in the editor's menu bar, draws a
niweleta the way the web frontend did: click to lay chained straights, drag
a corner to move it, and pick a fit for each gap between them. The geometry
is entirely maj0sted's - the panel gathers the input, hands the document to
solve_project and paints the rails that come back, coloured by whether they
came from a straight, an arc or a clothoid. Scenery nodes are untouched.

A fit the library cannot produce is simply absent from its answer, so the
gap is labelled as not fitting rather than left looking as though its
parameters took effect. Save/load go through the library's own document
format, so a project written here opens in the same state.

Also translates the comments added with -editor into English, matching the
files they sit in.
This commit is contained in:
maj00r
2026-07-31 19:00:35 +02:00
committed by maj00r
parent e3237034db
commit 4bef28cf94
8 changed files with 684 additions and 13 deletions
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69
application/planpanel.h Normal file
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/*
This Source Code Form is subject to the
terms of the Mozilla Public License, v.
2.0. If a copy of the MPL was not
distributed with this file, You can
obtain one at
http://mozilla.org/MPL/2.0/.
*/
#pragma once
#include "application/uilayer.h"
#include "maj0sted/app/editor_document.hpp"
#include "maj0sted/web/editor.hpp"
// drawing board for track layout: straights laid down by hand and the curves fitted into the gaps
// between them, in the project's own cartesian frame (EPSG:2180, metres). none of the geometry is
// computed here - the panel collects the input, hands the whole document to maj0sted and paints
// what comes back. scenery nodes are not touched.
class plan_panel : public ui_panel
{
public:
plan_panel(std::string const &Name, bool const Isopen);
void render_contents() override;
private:
// methods
void render_toolbar();
void render_canvas();
void render_gaps();
void render_storage();
// re-runs the solver over the whole document; cheap enough to do on every edit
void solve();
maj0sted::web::NiweletaSpec *current_niweleta();
maj0sted::web::NiweletaSpec const *current_niweleta() const;
// keeps exactly one fit slot per gap, so a gap's parameters survive edits to its neighbours
void align_fits();
// true when the solver actually produced the fit requested for the given gap
bool fit_applied(std::size_t const Gap) const;
// the panel edits a chained polyline, so a vertex is shared by the two straights meeting at it.
// the library allows fully independent straights; that freedom just isn't exposed here yet
std::size_t vertex_count() const;
void vertex_position(std::size_t const Index, double &X, double &Y) const;
void append_vertex(double const X, double const Y);
void move_vertex(std::size_t const Index, double const X, double const Y);
void drop_last_vertex();
// centres the view on the drawing, or on a default patch of ground when nothing is drawn yet
void frame_all();
// members
maj0sted::app::EditorDocument m_document;
std::vector<maj0sted::web::NiweletaPolys> m_solved;
std::size_t m_niweleta{0}; // niweleta being drawn into
int m_draggedvertex{-1};
bool m_drawing{true}; // whether a click on the canvas lays track or only picks vertices
bool m_panning{false};
// first corner of a niweleta has nothing to attach to, so it waits for the second click
bool m_pending{false};
double m_pendingx{0.0};
double m_pendingy{0.0};
// view: the plan point sitting at the centre of the canvas, and the zoom in pixels per metre
double m_viewx{0.0};
double m_viewy{0.0};
double m_scale{2.0};
std::string m_status;
char m_path[256]{"editor/plan.m0s"};
};