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battleship.js
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212 lines (169 loc) · 4.81 KB
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var model = {
boardSize: 7,
numShips: 3,
shipLength: 3,
shipsSunk: 0,
ships: [
{ locations: [0, 0, 0], hits: ["", "", ""] },
{ locations: [0, 0, 0], hits: ["", "", ""] },
{ locations: [0, 0, 0], hits: ["", "", ""] }
],
// original hard-coded values for ship locations
/*
ships: [
{ locations: ["06", "16", "26"], hits: ["", "", ""] },
{ locations: ["24", "34", "44"], hits: ["", "", ""] },
{ locations: ["10", "11", "12"], hits: ["", "", ""] }
],
*/
fire: function(guess) {
for (var i = 0; i < this.numShips; i++) {
var ship = this.ships[i];
var index = ship.locations.indexOf(guess);
// here's an improvement! Check to see if the ship
// has already been hit, message the user, and return true.
if (ship.hits[index] === "hit") {
view.displayMessage("Oops, you already hit that location!");
return true;
} else if (index >= 0) {
ship.hits[index] = "hit";
view.displayHit(guess);
view.displayMessage("HIT!");
if (this.isSunk(ship)) {
view.displayMessage("You sank my battleship!");
this.shipsSunk++;
}
return true;
}
}
view.displayMiss(guess);
view.displayMessage("You missed.");
return false;
},
isSunk: function(ship) {
for (var i = 0; i < this.shipLength; i++) {
if (ship.hits[i] !== "hit") {
return false;
}
}
return true;
},
generateShipLocations: function() {
var locations;
for (var i = 0; i < this.numShips; i++) {
do {
locations = this.generateShip();
} while (this.collision(locations));
this.ships[i].locations = locations;
}
console.log("Ships array: ");
console.log(this.ships);
},
generateShip: function() {
var direction = Math.floor(Math.random() * 2);
var row, col;
if (direction === 1) { // horizontal
row = Math.floor(Math.random() * this.boardSize);
col = Math.floor(Math.random() * (this.boardSize - this.shipLength + 1));
} else { // vertical
row = Math.floor(Math.random() * (this.boardSize - this.shipLength + 1));
col = Math.floor(Math.random() * this.boardSize);
}
var newShipLocations = [];
for (var i = 0; i < this.shipLength; i++) {
if (direction === 1) {
newShipLocations.push(row + "" + (col + i));
} else {
newShipLocations.push((row + i) + "" + col);
}
}
return newShipLocations;
},
collision: function(locations) {
for (var i = 0; i < this.numShips; i++) {
var ship = this.ships[i];
for (var j = 0; j < locations.length; j++) {
if (ship.locations.indexOf(locations[j]) >= 0) {
return true;
}
}
}
return false;
}
};
var view = {
displayMessage: function(msg) {
var messageArea = document.getElementById("messageArea");
messageArea.innerHTML = msg;
},
displayHit: function(location) {
var cell = document.getElementById(location);
cell.setAttribute("class", "hit");
},
displayMiss: function(location) {
var cell = document.getElementById(location);
cell.setAttribute("class", "miss");
}
};
var controller = {
guesses: 0,
processGuess: function(guess) {
var location = parseGuess(guess);
if (location) {
this.guesses++;
var hit = model.fire(location);
if (hit && model.shipsSunk === model.numShips) {
view.displayMessage("You sank all my battleships, in " + this.guesses + " guesses");
}
}
}
}
// helper function to parse a guess from the user
function parseGuess(guess) {
var alphabet = ["A", "B", "C", "D", "E", "F", "G"];
if (guess === null || guess.length !== 2) {
alert("Oops, please enter a letter and a number on the board.");
} else {
var firstChar = guess.charAt(0);
var row = alphabet.indexOf(firstChar);
var column = guess.charAt(1);
if (isNaN(row) || isNaN(column)) {
alert("Oops, that isn't on the board.");
} else if (row < 0 || row >= model.boardSize ||
column < 0 || column >= model.boardSize) {
alert("Oops, that's off the board!");
} else {
return row + column;
}
}
return null;
}
// event handlers
function handleFireButton() {
var guessInput = document.getElementById("guessInput");
var guess = guessInput.value.toUpperCase();
controller.processGuess(guess);
guessInput.value = "";
}
function handleKeyPress(e) {
var fireButton = document.getElementById("fireButton");
// in IE9 and earlier, the event object doesn't get passed
// to the event handler correctly, so we use window.event instead.
e = e || window.event;
if (e.keyCode === 13) {
fireButton.click();
return false;
}
}
// init - called when the page has completed loading
window.onload = init;
function init() {
// Fire! button onclick handler
var fireButton = document.getElementById("fireButton");
fireButton.onclick = handleFireButton;
// handle "return" key press
var guessInput = document.getElementById("guessInput");
guessInput.onkeypress = handleKeyPress;
// place the ships on the game board
model.generateShipLocations();
}