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<!DOCTYPE html>

<head>

<title>Track Editor</title>

<style>

* { box-sizing: border-box; }

body { margin: 0; overflow: hidden; background: #000; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; }

canvas { display: block; touch-action: none; }

#toolbar {

position: absolute;

bottom: 20px;

left: 50%;

transform: translateX(-50%);

display: flex;

align-items: center;

gap: 6px;

padding: 8px 10px;

background: rgba(255, 255, 255, 0.92);

backdrop-filter: blur(12px);

-webkit-backdrop-filter: blur(12px);

border-radius: 999px;

border: 1px solid rgba(0, 0, 0, 0.06);

box-shadow: 0 10px 30px rgba(0, 0, 0, 0.18);

z-index: 10;

}

#toolbar button {

padding: 9px;

border: none;

border-radius: 999px;

background: transparent;

color: #4a5260;

cursor: pointer;

transition: all 0.15s;

display: flex;

align-items: center;

justify-content: center;

}

#toolbar button svg {

width: 20px;

height: 20px;

display: block;

}

#toolbar button:hover {

background: rgba(0, 0, 0, 0.05);

color: #1f2430;

}

#toolbar button.active {

background: #1f2430;

color: #fff;

box-shadow: 0 2px 6px rgba(31, 36, 48, 0.25);

}

.separator {

width: 1px;

height: 24px;

background: rgba(0, 0, 0, 0.1);

margin: 0 2px;

flex-shrink: 0;

}

#toolbar button.action {

background: #4caf6a;

color: #fff;

box-shadow: 0 2px 6px rgba(76, 175, 106, 0.3);

}

#toolbar button.action:hover {

background: #3f9a5a;

color: #fff;

}

#toolbar button.danger {

color: #b3603a;

}

#toolbar button.danger:hover {

background: rgba(220, 100, 60, 0.12);

color: #a64b25;

}

#toast {

position: absolute;

bottom: 90px;

left: 50%;

transform: translateX(-50%);

padding: 10px 24px;

background: rgba(255, 255, 255, 0.95);

backdrop-filter: blur(12px);

-webkit-backdrop-filter: blur(12px);

color: #1f2430;

border-radius: 999px;

border: 1px solid rgba(0, 0, 0, 0.06);

box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);

font-size: 13px;

font-weight: 400;

opacity: 0;

transition: opacity 0.3s;

pointer-events: none;

z-index: 20;

}

#toast.show { opacity: 1; }

#github-link {

position: absolute;

top: 12px;

right: 12px;

color: #1f2430;

background: rgba(255, 255, 255, 0.92);

padding: 8px;

border-radius: 999px;

border: 1px solid rgba(0, 0, 0, 0.06);

box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18);

backdrop-filter: blur(12px);

-webkit-backdrop-filter: blur(12px);

line-height: 0;

z-index: 10;

transition: background 0.15s;

}

#github-link:hover { background: #fff; }

#github-link svg { display: block; width: 20px; height: 20px; }

</style>

{

"imports": {

"three": "https://cdn.jsdelivr.net/npm/three@0.185.1/build/three.module.js",

"three/addons/": "https://cdn.jsdelivr.net/npm/three@0.185.1/examples/jsm/"

}

</script>

</head>

<body>

</a>

</button>

</button>

</button>

</button>

</button>

</div>

import * as THREE from 'three';

import { ORIENT_DEG, CELL_RAW, GRID_SCALE, encodeCells, decodeCells } from './js/Track.js';

import { ColorMapGLTFLoader } from './js/Loader.js';

// ─── Auto-tile lookup ─────────────────────────────────────

// Bitmask: N=8 S=4 E=2 W=1

// Corner connectivity: 0°=S+W, 90°=S+E, 180°=N+E, 270°=N+W

const ORIENT_FLIP = { 0: 10, 10: 0, 16: 22, 22: 16 };

const AUTOTILE = [

[ 'track-straight', 0 ], // 0: isolated

[ 'track-straight', 16 ], // 1: W

[ 'track-straight', 16 ], // 2: E

[ 'track-straight', 16 ], // 3: E+W

[ 'track-straight', 0 ], // 4: S

[ 'track-corner', 0 ], // 5: S+W

[ 'track-corner', 16 ], // 6: S+E

[ 'track-straight', 16 ], // 7: S+E+W

[ 'track-straight', 0 ], // 8: N

[ 'track-corner', 22 ], // 9: N+W

[ 'track-corner', 10 ], // 10: N+E

[ 'track-straight', 16 ], // 11: N+E+W

[ 'track-straight', 0 ], // 12: N+S

[ 'track-straight', 0 ], // 13: N+S+W

[ 'track-straight', 0 ], // 14: N+S+E

[ 'track-straight', 0 ], // 15: N+S+E+W

];

// ─── State ────────────────────────────────────────────────

const grid = new Map(); // "gx,gz" → { type, orient, isFinish, mesh }

let tool = 'road'; // 'road', 'erase', 'pan'

function cellKey( gx, gz ) { return gx + ',' + gz; }

// ─── Renderer ─────────────────────────────────────────────

const renderer = new THREE.WebGLRenderer( { antialias: true } );

renderer.setSize( window.innerWidth, window.innerHeight );

renderer.setPixelRatio( window.devicePixelRatio );

renderer.shadowMap.enabled = true;

renderer.toneMapping = THREE.ACESFilmicToneMapping;

renderer.toneMappingExposure = 1.0;

document.body.appendChild( renderer.domElement );

// ─── Scene ────────────────────────────────────────────────

const scene = new THREE.Scene();

scene.background = new THREE.Color( 0xadb2ba );

scene.fog = new THREE.Fog( 0xadb2ba, 80, 160 );

const dirLight = new THREE.DirectionalLight( 0xffffff, 5 );

dirLight.position.set( 11.4, 15, - 5.3 );

dirLight.castShadow = true;

dirLight.shadow.mapSize.setScalar( 4096 );

dirLight.shadow.camera.near = 0.5;

dirLight.shadow.camera.far = 100;

dirLight.shadow.camera.left = - 60;

dirLight.shadow.camera.right = 60;

dirLight.shadow.camera.top = 60;

dirLight.shadow.camera.bottom = - 60;

scene.add( dirLight );

const hemiLight = new THREE.HemisphereLight( 0xc8d8e8, 0x7a8a5a, 1.5 );

scene.add( hemiLight );

// Ground

const gridSize = 30;

const cellWorld = CELL_RAW * GRID_SCALE;

const worldSize = gridSize * cellWorld;

const groundMat = new THREE.MeshStandardMaterial( { color: 0x328260, metalness: 0 } );

const ground = new THREE.Mesh( new THREE.PlaneGeometry( worldSize, worldSize ), groundMat );

ground.rotation.x = - Math.PI / 2;

ground.position.y = - 0.14;

ground.receiveShadow = true;

scene.add( ground );

// Grid helper

const gridHelper = new THREE.GridHelper( worldSize, gridSize, 0x1a4a36, 0x1a4a36 );

gridHelper.position.y = - 0.13;

gridHelper.material.opacity = 0.25;

gridHelper.material.transparent = true;

gridHelper.material.depthTest = false;

gridHelper.renderOrder = 1;

scene.add( gridHelper );

// Track group (mirrors game structure)

const trackGroup = new THREE.Group();

trackGroup.position.y = - 0.5;

trackGroup.scale.setScalar( GRID_SCALE );

scene.add( trackGroup );

// Ghost preview group

const ghostGroup = new THREE.Group();

ghostGroup.position.y = - 0.5;

ghostGroup.scale.setScalar( GRID_SCALE );

scene.add( ghostGroup );

let ghostMesh = null;

// ─── Camera (orthographic, top-down) ──────────────────────

const frustum = 30;

const aspect = window.innerWidth / window.innerHeight;

const camera = new THREE.OrthographicCamera(

- frustum * aspect, frustum * aspect,

frustum, - frustum,

0.1, 200

);

const cellCenter = 0.5 * CELL_RAW * GRID_SCALE;

// Shift the cell centered above the toolbar (mirror the toolbar's bottom

// margin above it so the cell sits in the middle of the visible area).

function computeCamOffsetZ() {

const rect = document.getElementById( 'toolbar' ).getBoundingClientRect();

const pad = window.innerHeight - rect.bottom;

const reserved = window.innerHeight - rect.top + pad;

return reserved / window.innerHeight * frustum;

}

let camOffsetZ = computeCamOffsetZ();

camera.position.set( cellCenter, 50, cellCenter + camOffsetZ );

camera.lookAt( cellCenter, 0, cellCenter + camOffsetZ );

const camTarget = new THREE.Vector3( cellCenter, 0, cellCenter + camOffsetZ );

window.addEventListener( 'resize', () => {

const a = window.innerWidth / window.innerHeight;

camera.left = - frustum * a;

camera.right = frustum * a;

const newOffset = computeCamOffsetZ();

const dz = newOffset - camOffsetZ;

camOffsetZ = newOffset;

camTarget.z += dz;

camera.position.z += dz;

camera.lookAt( camTarget.x, 0, camTarget.z );

camera.updateProjectionMatrix();

renderer.setSize( window.innerWidth, window.innerHeight );

} );

// ─── Load models ──────────────────────────────────────────

const loader = new ColorMapGLTFLoader();

const modelNames = [ 'track-straight', 'track-corner', 'track-bump', 'track-finish' ];

const models = {};

async function loadModels() {

const promises = modelNames.map( ( name ) =>

new Promise( ( resolve, reject ) => {

loader.load( `models/${ name }.glb`, ( gltf ) => {

gltf.scene.traverse( ( child ) => {

if ( child.isMesh ) child.material.side = THREE.FrontSide;

} );

models[ name ] = gltf.scene;

resolve();

}, undefined, reject );

} )

);

await Promise.all( promises );

}

// ─── Auto-tile resolve ────────────────────────────────────

// Exit bitmask for each piece type/orient

// Bits: N=8 S=4 E=2 W=1

function getCellExits( cell ) {

const t = cell.type;

const o = cell.orient;

if ( t === 'track-corner' ) {

if ( o === 0 ) return 5; // S+W

if ( o === 16 ) return 6; // S+E

if ( o === 10 ) return 10; // N+E

if ( o === 22 ) return 9; // N+W

}

// Straight, finish, bump — all symmetric

if ( o === 0 || o === 10 ) return 12; // N+S

return 3; // E+W

}

// Check which neighbors have a road exit facing toward this cell

function getConnectivityMask( gx, gz ) {

let mask = 0;

// N neighbor has S exit?

const n = grid.get( cellKey( gx, gz - 1 ) );

if ( n && ( getCellExits( n ) & 4 ) ) mask |= 8;

// S neighbor has N exit?

const s = grid.get( cellKey( gx, gz + 1 ) );

if ( s && ( getCellExits( s ) & 8 ) ) mask |= 4;

// E neighbor has W exit?

const e = grid.get( cellKey( gx + 1, gz ) );

if ( e && ( getCellExits( e ) & 1 ) ) mask |= 2;

// W neighbor has E exit?

const w = grid.get( cellKey( gx - 1, gz ) );

if ( w && ( getCellExits( w ) & 2 ) ) mask |= 1;

return mask;

}

// Raw presence mask (any road in adjacent cell)

function getPresenceMask( gx, gz ) {

let mask = 0;

if ( grid.has( cellKey( gx, gz - 1 ) ) ) mask |= 8;

if ( grid.has( cellKey( gx, gz + 1 ) ) ) mask |= 4;

if ( grid.has( cellKey( gx + 1, gz ) ) ) mask |= 2;

if ( grid.has( cellKey( gx - 1, gz ) ) ) mask |= 1;

return mask;

}

// Count bits in a 4-bit mask

function bitCount( mask ) {

return ( mask >> 3 & 1 ) + ( mask >> 2 & 1 ) + ( mask >> 1 & 1 ) + ( mask & 1 );

}

// Count how many of a cell's exits are connected to neighbors

function connectedExitCount( gx, gz ) {

const cell = grid.get( cellKey( gx, gz ) );

if ( ! cell ) return 0;

return bitCount( getCellExits( cell ) & getConnectivityMask( gx, gz ) );

}

// When a new cell has 3+ neighbors, pick the best pair to connect.

// Prefer corners over straights, then prefer neighbors with more existing connections.

const DIR_INFO = [

{ bit: 8, dx: 0, dz: - 1 }, // N

{ bit: 4, dx: 0, dz: 1 }, // S

{ bit: 2, dx: 1, dz: 0 }, // E

{ bit: 1, dx: - 1, dz: 0 }, // W

];

function pickBestPair( mask, gx, gz ) {

const active = DIR_INFO.filter( d => mask & d.bit );

if ( active.length <= 2 ) return mask;

let bestMask = active[ 0 ].bit | active[ 1 ].bit;

let bestScore = - 1;

let bestIsCorner = false;

for ( let i = 0; i < active.length; i ++ ) {

for ( let j = i + 1; j < active.length; j ++ ) {

const pairMask = active[ i ].bit | active[ j ].bit;

const isCorner = ( pairMask !== 3 && pairMask !== 12 ); // not E+W or N+S

const s1 = connectedExitCount( gx + active[ i ].dx, gz + active[ i ].dz );

const s2 = connectedExitCount( gx + active[ j ].dx, gz + active[ j ].dz );

const score = s1 + s2;

if ( ( isCorner && ! bestIsCorner ) ||

( isCorner === bestIsCorner && score > bestScore ) ) {

bestMask = pairMask;

bestScore = score;

bestIsCorner = isCorner;

}

return bestMask;

}

// Only count neighbors that can actually connect:

// either they already exit toward us, or they have a free (unconnected) exit

function getAvailableMask( gx, gz ) {

let mask = 0;

const dirs = [

[ 0, - 1, 8, 4 ], // N neighbor, sets N bit, check if neighbor has S exit

[ 0, 1, 4, 8 ], // S neighbor, sets S bit, check if neighbor has N exit

[ 1, 0, 2, 1 ], // E neighbor, sets E bit, check if neighbor has W exit

[ - 1, 0, 1, 2 ], // W neighbor, sets W bit, check if neighbor has E exit

];

for ( const [ dx, dz, bit, oppBit ] of dirs ) {

const neighbor = grid.get( cellKey( gx + dx, gz + dz ) );

if ( ! neighbor ) continue;

const exits = getCellExits( neighbor );

// Already has an exit facing us

if ( exits & oppBit ) { mask |= bit; continue; }

// Has a free (unconnected) exit — could change to face us

const conn = getConnectivityMask( gx + dx, gz + dz );

if ( bitCount( exits & conn ) < 2 ) mask |= bit;

}

return mask;

}

// Resolve tile for new cells: use available neighbors, pick best pair if 3+

function resolveNewTile( gx, gz ) {

const pMask = getAvailableMask( gx, gz );

if ( bitCount( pMask ) >= 3 ) {

return AUTOTILE[ pickBestPair( pMask, gx, gz ) ];

}

return AUTOTILE[ pMask ];

}

function resolveTile( gx, gz ) {

const cMask = getConnectivityMask( gx, gz );

// If any neighbor connects toward us, use connectivity-based auto-tile

if ( cMask !== 0 ) return AUTOTILE[ cMask ];

// No neighbor connects toward us — orient parallel to nearest road

const pMask = getPresenceMask( gx, gz );

if ( pMask !== 0 ) {

// Find any adjacent road cell and match its direction

const dirs = [ [ 0, - 1, 8 ], [ 0, 1, 4 ], [ 1, 0, 2 ], [ - 1, 0, 1 ] ];

for ( const [ dx, dz, bit ] of dirs ) {

if ( ! ( pMask & bit ) ) continue;

const neighbor = grid.get( cellKey( gx + dx, gz + dz ) );

if ( ! neighbor ) continue;

const exits = getCellExits( neighbor );

// Match the neighbor's running direction

if ( exits & 12 ) return [ 'track-straight', 0 ]; // neighbor runs N-S

if ( exits & 3 ) return [ 'track-straight', 16 ]; // neighbor runs E-W

}

return AUTOTILE[ 0 ]; // isolated default

}

function placeMesh( gx, gz, cell ) {

if ( cell.mesh ) trackGroup.remove( cell.mesh );

const src = models[ cell.type ];

if ( ! src ) return;

const mesh = src.clone();

mesh.position.set( ( gx + 0.5 ) * CELL_RAW, 0.5, ( gz + 0.5 ) * CELL_RAW );

mesh.rotation.y = THREE.MathUtils.degToRad( ORIENT_DEG[ cell.orient ] || 0 );

mesh.traverse( ( c ) => {

if ( c.isMesh ) {

c.castShadow = true;

c.receiveShadow = true;

}

} );

trackGroup.add( mesh );

cell.mesh = mesh;

}

function resolveCell( gx, gz ) {

const key = cellKey( gx, gz );

const cell = grid.get( key );

if ( ! cell ) return;

let baseType, orient;

if ( ! cell.mesh ) {

// New cell: connect to neighbors, pick best pair if 3+

[ baseType, orient ] = resolveNewTile( gx, gz );

} else {

// Existing cell: re-resolve, but don't break existing connections

const cMask = getConnectivityMask( gx, gz );

const currentExits = getCellExits( cell );

const currentConnected = currentExits & cMask;

[ baseType, orient ] = resolveTile( gx, gz );

// Check if the proposed shape keeps all current connections

const proposedExits = getCellExits( { type: baseType, orient } );

if ( ( proposedExits & currentConnected ) !== currentConnected ) {

// Would disconnect something — keep current shape

return;

}

// Finish cells use track-finish but only when resolved as straight

const type = ( cell.isFinish && baseType === 'track-straight' ) ? 'track-finish' : baseType;

// Skip if nothing changed and mesh already exists

if ( cell.type === type && cell.orient === orient && cell.mesh ) return;

cell.type = type;

cell.orient = orient;

placeMesh( gx, gz, cell );

}

function resolveCellAndNeighbors( gx, gz ) {

resolveCell( gx, gz );

resolveCell( gx, gz - 1 );

resolveCell( gx, gz + 1 );

resolveCell( gx + 1, gz );

resolveCell( gx - 1, gz );

}

// ─── Cell operations ──────────────────────────────────────

function placeRoad( gx, gz ) {

const key = cellKey( gx, gz );

if ( grid.has( key ) ) {

const cell = grid.get( key );

// Click on finish tile → flip direction (rotate 180°)

if ( cell.isFinish ) {

cell.orient = ORIENT_FLIP[ cell.orient ] ?? cell.orient;

placeMesh( gx, gz, cell );

save();

}

return;

}

grid.set( key, { type: 'track-straight', orient: 0, isFinish: false, mesh: null } );

resolveCellAndNeighbors( gx, gz );

save();

}

function placeFinish() {

const cell = { type: 'track-finish', orient: 0, isFinish: true, mesh: null };

grid.set( cellKey( 0, 0 ), cell );

placeMesh( 0, 0, cell );

}

function eraseRoad( gx, gz ) {

const key = cellKey( gx, gz );

if ( ! grid.has( key ) ) return;

// Don't allow erasing the finish tile

const cell = grid.get( key );

if ( cell.isFinish ) return;

if ( cell.mesh ) trackGroup.remove( cell.mesh );

grid.delete( key );

// Re-resolve neighbors

resolveCell( gx, gz - 1 );

resolveCell( gx, gz + 1 );

resolveCell( gx + 1, gz );

resolveCell( gx - 1, gz );

save();

}

function clearAll() {

for ( const [ , cell ] of grid ) {

if ( cell.mesh ) trackGroup.remove( cell.mesh );

}

grid.clear();

placeFinish();

save();

}

// ─── Ghost preview ────────────────────────────────────────

// Neighbor cells whose meshes are temporarily swapped during ghost preview

const ghostNeighborBackups = []; // { cell, originalMesh }

function addGhostPiece( type, orient, gx, gz, opacity ) {

const src = models[ type ];

if ( ! src ) return;

const mesh = src.clone();

mesh.position.set( ( gx + 0.5 ) * CELL_RAW, 0.5, ( gz + 0.5 ) * CELL_RAW );

const deg = ORIENT_DEG[ orient ] || 0;

mesh.rotation.y = THREE.MathUtils.degToRad( deg );

mesh.traverse( ( c ) => {

if ( c.isMesh ) {

c.material = c.material.clone();

c.material.transparent = true;

c.material.opacity = opacity;

}

} );

ghostGroup.add( mesh );

}

function updateGhost( gx, gz ) {

clearGhost();

if ( tool !== 'road' ) return;

const key = cellKey( gx, gz );

if ( grid.has( key ) ) return; // already occupied

// Temporarily insert ghost cell into grid

const ghostCell = { type: 'track-straight', orient: 0, isFinish: false, mesh: null };

grid.set( key, ghostCell );

// Resolve ghost: connect to neighbors, pick best pair if 3+

const [ type, orient ] = resolveNewTile( gx, gz );

// Update ghost cell in grid so neighbors see its correct exits

ghostCell.type = type;

ghostCell.orient = orient;

// Show ghost piece

addGhostPiece( type, orient, gx, gz, 0.4 );

// Check how neighbors would change and preview those changes

const neighbors = [ [ gx, gz - 1 ], [ gx, gz + 1 ], [ gx + 1, gz ], [ gx - 1, gz ] ];

for ( const [ nx, nz ] of neighbors ) {

const nKey = cellKey( nx, nz );

const nCell = grid.get( nKey );

if ( ! nCell ) continue;

// Re-resolve neighbor, but skip if it would break existing connections

const nExits = getCellExits( nCell );

const nConn = getConnectivityMask( nx, nz );

const nConnected = nExits & nConn;

const [ newType, newOrient ] = resolveTile( nx, nz );

const proposedExits = getCellExits( { type: newType, orient: newOrient } );

if ( ( proposedExits & nConnected ) !== nConnected ) continue;

const finalType = ( nCell.isFinish && newType === 'track-straight' ) ? 'track-finish' : newType;

if ( finalType !== nCell.type || newOrient !== nCell.orient ) {

// Hide the real mesh temporarily

if ( nCell.mesh ) {

nCell.mesh.visible = false;

ghostNeighborBackups.push( { cell: nCell } );

}

// Show preview of what the neighbor would become

addGhostPiece( finalType, newOrient, nx, nz, 0.7 );

}

// Remove the temporary ghost cell from the grid

grid.delete( key );

}

function clearGhost() {

// Restore hidden neighbor meshes

for ( const { cell } of ghostNeighborBackups ) {

if ( cell.mesh ) cell.mesh.visible = true;

}

ghostNeighborBackups.length = 0;

// Remove all ghost preview meshes

while ( ghostGroup.children.length > 0 ) {

ghostGroup.remove( ghostGroup.children[ 0 ] );

}

// ─── Raycasting ───────────────────────────────────────────

const raycaster = new THREE.Raycaster();

const mouse = new THREE.Vector2();

function screenToGrid( clientX, clientY ) {

mouse.x = ( clientX / window.innerWidth ) * 2 - 1;

mouse.y = - ( clientY / window.innerHeight ) * 2 + 1;

raycaster.setFromCamera( mouse, camera );

const plane = new THREE.Plane( new THREE.Vector3( 0, 1, 0 ), 0.51 );

const hit = new THREE.Vector3();

raycaster.ray.intersectPlane( plane, hit );

if ( ! hit ) return null;

const gx = Math.floor( hit.x / cellWorld );

const gz = Math.floor( hit.z / cellWorld );

return { gx, gz };

}

// ─── Persistence ──────────────────────────────────────────

function save() {

const arr = [];

for ( const [ key, cell ] of grid ) {

const [ gx, gz ] = key.split( ',' ).map( Number );

arr.push( [ gx, gz, cell.type, cell.orient ] );

}

const encoded = encodeCells( arr );

localStorage.setItem( 'racing-editor-cells', encoded );

}

function loadSaved() {

const params = new URLSearchParams( window.location.search );

const mapParam = params.get( 'map' );

const encoded = mapParam || localStorage.getItem( 'racing-editor-cells' );

if ( ! encoded ) return;

try {

const arr = decodeCells( encoded );

for ( const [ gx, gz, type, orient ] of arr ) {

const isFinish = ( type === 'track-finish' );

const cell = { type, orient, isFinish, mesh: null };

grid.set( cellKey( gx, gz ), cell );

placeMesh( gx, gz, cell );

}

} catch ( e ) {

console.warn( 'Failed to load saved map', e );

}

// ─── Toast ────────────────────────────────────────────────

let toastTimer = 0;

function showToast( msg ) {

const el = document.getElementById( 'toast' );

el.textContent = msg;

el.classList.add( 'show' );

clearTimeout( toastTimer );

toastTimer = setTimeout( () => el.classList.remove( 'show' ), 2000 );

}

// ─── Toolbar ──────────────────────────────────────────────

const btnRoad = document.getElementById( 'btn-road' );

const btnErase = document.getElementById( 'btn-erase' );

const btnPan = document.getElementById( 'btn-pan' );

function selectTool( t ) {

tool = t;

btnRoad.classList.toggle( 'active', t === 'road' );

btnErase.classList.toggle( 'active', t === 'erase' );

btnPan.classList.toggle( 'active', t === 'pan' );

if ( t === 'pan' ) clearGhost();

updateCursor();

}

btnRoad.addEventListener( 'click', () => selectTool( 'road' ) );

btnErase.addEventListener( 'click', () => selectTool( 'erase' ) );

btnPan.addEventListener( 'click', () => selectTool( 'pan' ) );

document.getElementById( 'toolbar' ).addEventListener( 'pointerenter', clearGhost );

function getCellsArray() {

const arr = [];

for ( const [ key, cell ] of grid ) {

const [ gx, gz ] = key.split( ',' ).map( Number );

arr.push( [ gx, gz, cell.type, cell.orient ] );

}

return arr;

}

document.getElementById( 'btn-play' ).addEventListener( 'click', () => {

if ( grid.size === 0 ) {

showToast( 'Draw some road first!' );

return;

}

const encoded = encodeCells( getCellsArray() );

window.open( 'index.html?map=' + encoded, '_blank' );

} );

document.getElementById( 'btn-clear' ).addEventListener( 'click', () => {

if ( ! confirm( 'Clear the entire track?' ) ) return;

clearAll();

showToast( 'Track cleared' );

} );

// ─── Input (pointer events) ───────────────────────────────

let isPanning = false;

let isDrawing = false;

let isErasing = false;

let panStart = { x: 0, y: 0 };

let camStart = { x: 0, z: 0 };

let lastDrawCell = null;

let spaceDown = false;

// Track active pointers for multi-touch (pinch/pan)

const pointers = new Map();

let pinchStartDist = 0;

let pinchStartZoom = 1;

const el = renderer.domElement;

function updateCursor() {

if ( isPanning ) el.style.cursor = 'grabbing';

else if ( spaceDown || tool === 'pan' ) el.style.cursor = 'grab';

else el.style.cursor = '';

}

el.addEventListener( 'contextmenu', ( e ) => e.preventDefault() );

function handleDraw( clientX, clientY ) {

const cell = screenToGrid( clientX, clientY );

if ( ! cell ) return;

if ( lastDrawCell && lastDrawCell.gx === cell.gx && lastDrawCell.gz === cell.gz ) return;

lastDrawCell = cell;

if ( isErasing ) {

eraseRoad( cell.gx, cell.gz );

} else if ( isDrawing ) {

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