Solution to level 21 in Untrusted: http://alex.nisnevich.com/untrusted/

http://alex.nisnevich.com/untrusted/ · GitHub

/* Objects can have the following parameters: color: '#fff' by default impassable: true if it blocks the player from movement (false by default) onCollision: function (player) called when player moves over the object onPickUp: function (player) called when player picks up the item symbol: Unicode character representing the object type: 'item' or null */

// used by bonus levels 01 through 04 function moveToward(obj, type) { var target = obj.findNearest(type); var leftDist = obj.getX() - target.x; var upDist = obj.getY() - target.y;

var direction; if (upDist == 0 && leftDist == 0) { return; } if (upDist > 0 && upDist >= leftDist) { direction = 'up'; } else if (upDist < 0 && upDist < leftDist) { direction = 'down'; } else if (leftDist > 0 && leftDist >= upDist) { direction = 'left'; } else { direction = 'right'; }

if (obj.canMove(direction)) { obj.move(direction); } }

// used by bonus levels 01 through 04 function followAndKeepDistance(obj, type) { var target = obj.findNearest(type); var leftDist = obj.getX() - target.x; var upDist = obj.getY() - target.y;

if (Math.abs(upDist) < 2 && Math.abs(leftDist) < 4 || Math.abs(leftDist) < 2 && Math.abs(upDist) < 4) { return; } var direction; if (upDist > 0 && upDist >= leftDist) { direction = 'up'; } else if (upDist < 0 && upDist < leftDist) { direction = 'down'; } else if (leftDist > 0 && leftDist >= upDist) { direction = 'left'; } else { direction = 'right'; }

if (obj.canMove(direction)) { obj.move(direction); } }

// used by bonus levels 01 through 04 function killPlayerIfTooFar(obj, map) { var target = obj.findNearest('player'); var leftDist = obj.getX() - target.x; var upDist = obj.getY() - target.y;

if (Math.abs(upDist) > 8 || Math.abs(leftDist) > 8) { map.getPlayer().killedBy('"suspicious circumstances"'); } }

Game.prototype.getListOfObjects = function () { var game = this; return { // special

'empty' : { 'symbol': ' ', 'impassableFor': ['raft'] },

'player' : { 'symbol': '@', 'color': '#0f0' },

'exit' : { 'symbol' : String.fromCharCode(0x2395), // ⎕ 'color': '#0ff', 'onCollision': function (player) { game._callUnexposedMethod(function () { game._moveToNextLevel(); }); } },

// obstacles

'block': { 'symbol': '#', 'color': '#999', 'impassable': true },

'tree': { 'symbol': '♣', 'color': '#080', 'impassable': true },

'mine': { 'symbol': ' ', 'onCollision': function (player) { player.killedBy('a hidden mine'); } },

'trap': { 'type': 'dynamic', 'symbol': '*', 'color': '#f00', 'onCollision': function (player, me) { player.killedBy('a trap'); }, 'behavior': null },

'teleporter': { 'type': 'dynamic', 'symbol' : String.fromCharCode(0x2395), // ⎕ 'color': '#f0f', 'onCollision': function (player, me) { if (!player._hasTeleported) { if (me.target) { game._callUnexposedMethod(function () { player._moveTo(me.target); }); } else { throw 'TeleporterError: Missing target for teleporter' } } player._hasTeleported = true; }, 'behavior': null },

// items

'computer': { 'type': 'item', 'symbol': String.fromCharCode(0x2318), // ⌘ 'color': '#ccc', 'onPickUp': function (player) { $('#editorPane').fadeIn(); game.editor.refresh(); game.map.writeStatus('You have picked up the computer!'); }, 'onDrop': function () { $('#editorPane').hide(); } },

'phone': { 'type': 'item', 'minimumLevel': 7, 'symbol': String.fromCharCode(0x260E), // ☎ 'onPickUp': function (player) { game.map.writeStatus('You have picked up the function phone!'); $('#phoneButton').show(); }, 'onDrop': function () { $('#phoneButton').hide(); } },

'redKey': { 'type': 'item', 'minimumLevel': 11, 'symbol': 'k', 'color': 'red', 'onPickUp': function (player) { game.map.writeStatus('You have picked up a red key!'); } },

'greenKey': { 'type': 'item', 'minimumLevel': 12, 'symbol': 'k', 'color': '#0f0', 'onPickUp': function (player) { game.map.writeStatus('You have picked up a green key!'); } },

'blueKey': { 'type': 'item', 'minimumLevel': 13, 'symbol': 'k', 'color': '#06f', 'onPickUp': function (player) { game.map.writeStatus('You have picked up a blue key!'); } },

'yellowKey': { 'type': 'item', 'minimumLevel': 14, 'symbol': 'k', 'color': 'yellow', 'onPickUp': function (player) { game.map.writeStatus('You have picked up a yellow key!'); } },

'theAlgorithm': { 'minimumLevel': 14, 'type': 'item', 'symbol': 'A', 'color': 'white', 'onPickUp': function (player) { game.map.writeStatus('You have picked up the Algorithm!'); }, 'onDrop': function () { game.map.writeStatus('You have lost the Algorithm!'); } },

// used by bonus levels 01 through 04 'eye': { 'type': 'dynamic', 'symbol': 'E', 'color': 'red', 'behavior': function (me) { followAndKeepDistance(me, 'player'); killPlayerIfTooFar(me, game.map); }, 'onCollision': function (player) { player.killedBy('"the eye"'); }, },

// used by bonus levels 01 through 04 'guard': { 'type': 'dynamic', 'symbol': 'd', 'color': 'red', 'behavior': function (me) { moveToward(me, 'player'); }, 'onCollision': function (player) { player.killedBy('a guard drone'); }, } }; };