altitude Lines plus draw gradient

html/script.js

@@ -1108,6 +1108,8 @@ function parse_history() {
 
     loadFinished = true;
 
+    //drawAlt();
+
     if (localStorage['sidebar_visible'] == "false")
         toggleSidebarVisibility();
 
@@ -3900,3 +3902,15 @@ function initSitePos() {
         document.getElementById("distance").style.display = 'none'; // hide distance header
     }
 }
+
+function drawAlt() {
+    processAircraft({hex: 'c0ffee', });
+    var plane = Planes['c0ffee'];
+    newWidth = 4;
+    for (var i = 0; i <= 50000; i += 500) {
+        plane.position = [i/10000, 0];
+        plane.altitude = i;
+        plane.alt_rounded = calcAltitudeRounded(plane.altitude);
+        plane.updateTrack(now - i, now - i - 5000, { serverTrack: true });
+    }
+}