y+gz*scale;
ctx.fillRect(px, py, Math.max(1,step*scale), Math.max(1,step*scale));
}
}
// contour rings every 4 units of elevation
ctx.strokeStyle = 'rgba(216,169,32,0.3)';
ctx.lineWidth = 1;
for(var e=-12; e<=12; e+=4){
ctx.beginPath();
var first = true;
for(var a=0; a<=Math.PI*2+0.1; a+=0.1){
// approximate contour as deformed circle
var rad = 300 + e*20;
var wx = Math.cos(a)*rad, wz = Math.sin(a)*rad;
// nudge by terrain
var hh = getTerrainH(wx, wz);
var adj = (hh-e)*8;
wx += Math.cos(a)*adj; wz += Math.sin(a)*adj;
var px2 = cx+wx*scale, py2 = cy+wz*scale;
if(first){ ctx.moveTo(px2,py2); first=false; }
else ctx.lineTo(px2,py2);
}
ctx.stroke();
}
// highways
ctx.strokeStyle = '#666';
ctx.lineWidth = 3;
if(typeof _highwayPts!=='undefined'){
_highwayPts.forEach(function(pts){
ctx.beginPath();
pts.forEach(function(p, i){
var px = cx+p[0]*scale, py = cy+p[1]*scale;
if(i===0) ctx.moveTo(px,py); else ctx.lineTo(px,py);
});
ctx.stroke();
});
}
// heatmap — where he's been
if(_metrics.positions.length>0){
_metrics.positions.forEach(function(p){
var px = cx+p.x*scale, py = cy+p.z*scale;
var grad = ctx.createRadialGradient(px,py,0,px,py,8);
grad.addColorStop(0, 'rgba(255,0,0,0.6)');
grad.addColorStop(1, 'rgba(255,0,0,0)');
ctx.fillStyle = grad;
ctx.beginPath();
ctx.arc(px, py, 8, 0, Math.PI*2);
ctx.fill();
});
}
// player
if(typeof mePos!=='undefined'){
ctx.fillStyle = '#00ff00';
ctx.beginPath();
ctx.arc(cx+mePos.x*scale, cy+mePos.z*scale, 5, 0, Math.PI*2);
ctx.fill();
}
// legend
var legend = document.createElement('div');
legend.innerHTML = '\u25cf where you have been \u25cf you are \u2014 highways';
legend.style.cssText = 'color:#aaa;font-size:12px;margin-top:10px;font-family:sans-serif;';
ov.appendChild(legend);
var hint = document.createElement('div');
hint.innerHTML = 'tap anywhere to close • type "topo" to reopen';
hint.style.cssText = 'color:#666;font-size:11px;margin-top:5px;font-family:sans-serif;';
ov.appendChild(hint);
ov.addEventListener('click', function(){ ov.remove(); });
document.body.appendChild(ov);
if(typeof codeStatus==='function') codeStatus('topographic map — '+_metrics.positions.length+' tracks');
}catch(e){
if(typeof codeStatus==='function') codeStatus('topo failed');
}
}
function showMetrics(){
try{
if(typeof codeStatus==='function')
codeStatus('metrics: '+_metrics.positions.length+' positions tracked, '+_metrics.fixes+' auto-fixes');
}catch(e){}
}
/* HIGHWAY GUARDIAN — nothing builds on highways except power lines */
var _highwayPts = [
[[12,0],[50,15],[100,10],[200,30],[400,20],[600,40],[800,60],[1000,50],[1200,70]],
[[12,0],[40,-25],[90,-40],[180,-35],[350,-50],[550,-40],[750,-60],[950,-50],[1150,-70]],
[[0,12],[-15,50],[-10,100],[-30,200],[-20,400],[-40,600],[-60,800],[-50,1000],[-70,1200]],
[[0,12],[20,55],[15,110],[35,220],[30,420],[50,600],[60,800],[70,1000],[80,1180]],
[[-12,0],[-50,-15],[-100,-10],[-200,-30],[-400,-20],[-600,-40],[-800,-60],[-1000,-50],[-1200,-70]],
[[0,-12],[15,-50],[10,-100],[30,-200],[20,-400],[40,-600],[50,-800],[60,-1000],[70,-1200]],
[[60,60],[120,110],[200,100],[280,150],[220,220],[140,200],[80,240]]
];
function isOnHighway(x, z){
try{
for(var r=0; r<_highwayPts.length; r++){
var pts = _highwayPts[r];
for(var i=0; i0 ? Math.max(0, Math.min(1, ((x-ax)*dx+(z-az)*dz)/len2)) : 0;
var px=ax+dx*t, pz=az+dz*t;
var dist = Math.sqrt((x-px)*(x-px)+(z-pz)*(z-pz));
if(dist < 8) return true;
}
}
}catch(e){}
return false;
}
var _buildingPower = false;
function buildPowerline(tl){
try{
_buildingPower = true;
var parts = (tl||'').split(' ');
var count = parseInt(parts[1]) || 10;
var pts = _highwayPts[0];
var g = new THREE.Group();
var poleMat = new THREE.MeshStandardMaterial({color:0x4a3728, roughness:0.8});
var wireMat = new THREE.MeshBasicMaterial({color:0x222222});
var prevTop = null;
for(var i=0; i