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a guest Nov 25th, 2015 161 Never
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  1. function calculateArrow(x1, x2, y1, y2) {
  2.   var deg = -90;
  3.   var dist_x = x1 - x2;
  4.   var dist_y = Math.abs(y1 - y2);
  5.   if (dist_y != 0) {
  6.     deg = Math.atan(dist_x / dist_y);
  7.   }
  8.   if (y2 < y1) {
  9.     deg = -1 * ((deg + Math.PI) % (2 * Math.PI));
  10.   }
  11.   return deg * 360 / (2 * Math.PI);
  12. }
  13.  
  14. function renderRadar() {
  15.         var mindist = 10000000000;
  16.         var closest;
  17.         var remainingFound = false;
  18.         for (var S = 0; S < explorer.objects.length; S++) {
  19.                 var I = explorer.objects[S];
  20.                 if (!I.got) {
  21.                         remainingFound = true;
  22.                         var dist = distance(explorer.pos.x, explorer.pos.y, I.x1, I.y1);
  23.                         if (dist < mindist) {
  24.                                 mindist = dist;
  25.                                 closest = I;
  26.                         }
  27.                 }
  28.         }
  29.         if (!remainingFound) {
  30.                 document.getElementById("radar").innerHTML = "You found all coins!";
  31.                 return;
  32.         }
  33.         var indicator = "";
  34.         var deg = calculateArrow(closest.x1, explorer.pos.x, closest.y1, explorer.pos.y);
  35.         var dist_x = Math.abs(closest.x1 - explorer.pos.x);
  36.         var dist_y = Math.abs(closest.y1 - explorer.pos.y);
  37.         if (closest.x1 < explorer.pos.x) {
  38.                 indicator += ((dist_x < 500)?"slightly ":"") + "left";
  39.         }
  40.         if (closest.x1 > explorer.pos.x) {
  41.                 indicator += ((dist_x < 500)?"slightly ":"") + "right";
  42.         }
  43.         if (closest.y1 < explorer.pos.y) {
  44.                 indicator += ((dist_y < 500)?"slightly ":"") + " up";
  45.         }
  46.         if (closest.y1 > explorer.pos.y) {
  47.                 indicator += ((dist_y < 500)?"slightly ":"") + " down";
  48.         }
  49.         document.getElementById("radar").innerHTML = "Distance: " + mindist.toFixed(1).toString() + "<br/><div id=\"indic\" style=\"transform: rotate(" + deg + "deg)\" title=\"indicator\">&#8593;</div>";
  50. }
  51. setInterval(renderRadar, 100);
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