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  1. /*************
  2.  * lasers.js *
  3.  *************
  4.  *
  5.  * Time to unleash the killer lasers! Each laser will kill you
  6.  * unless you have the appropriate color. Too bad you can't
  7.  * see which color corresponds to which laser!
  8.  */
  9.  
  10. function getRandomInt(min, max) {
  11.     return Math.floor(Math.random() * (max - min + 1)) + min;
  12. }
  13.  
  14. function startLevel(map) {
  15.     map.placePlayer(0, 0);
  16.     map.placeObject(map.getWidth()-1, map.getHeight()-1, 'exit');
  17.     var player = map.getPlayer();
  18.  
  19.     for (var i = 0; i < 25; i++) {
  20.         var colors = ['red', 'yellow', 'teal'];
  21.  
  22.         var startX = getRandomInt(0, 600);
  23.         var startY = getRandomInt(0, 500);
  24.         var angle = getRandomInt(0, 360);
  25.         var length = getRandomInt(200, 300);
  26.         var color = colors[i % 3];
  27.         createLaser(startX, startY, angle, length, color);
  28.     }
  29.  
  30.     function createLaser(centerX, centerY, angleInDegrees, length, color) {
  31.         var angleInRadians = angleInDegrees * Math.PI / 180;
  32.  
  33.         var x1 = centerX - Math.cos(angleInRadians) * length / 2;
  34.         var y1 = centerY + Math.sin(angleInRadians) * length / 2;
  35.         var x2 = centerX + Math.cos(angleInRadians) * length / 2;
  36.         var y2 = centerY - Math.sin(angleInRadians) * length / 2;
  37.  
  38.         // map.createLine() creates a line with an effect when
  39.         // the player moves over it, but doesn't display it
  40.         map.createLine([x1, y1], [x2, y2], function (player) {
  41.             if (player.getColor() != color) {
  42.                 player.killedBy('a ' + color + ' laser');
  43.             }
  44.         });
  45.  
  46.         // using canvas to draw the line
  47.         var ctx = map.getCanvasContext();
  48.         ctx.beginPath();
  49.         ctx.strokeStyle = 'white';
  50.         ctx.lineWidth = 5;
  51.         ctx.moveTo(x1, y1);
  52.         ctx.lineTo(x2, y2);
  53.         ctx.stroke();
  54.  
  55.     }
  56.  
  57.  
  58. getRandomInt = function(){return 600;};
  59.  
  60.  
  61.  
  62.  
  63.  
  64.  
  65.  
  66. }
  67.  
  68. function validateLevel(map) {
  69.     map.validateExactlyXManyObjects(1, 'exit');
  70.     map.validateAtLeastXLines(25);
  71. }
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