Console.Write("Hello World!");
Olá, fiz um snake game com JavaScript (usando o jQuery pra deixar o código mais limpo) e SVG para desenhar os elementos na tela. O HTML foi usado apenas pra criar a estrutura básica da página.O objetivo era ser simples mesmo.
Caso queiram jogar, acesse: http://snakegamejs.orgfree.com/Snake
Código completo:
Código:
<!DOCTYPE html>
<html lang = "pt-br">
<head>
<title> Snake in Javascript</title>
<meta charset = "utf-8"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
document.onkeydown = CheckKey;
var resolution = 30; // Set pixel resolution to snake and food
var width_Screen, heigth_Screen;
var svgNS = "http://www.w3.org/2000/svg";
var interval_a = window.setInterval(function(){Move();}, 80);
var body = [];
var pointsX = [];
var pointsY = [];
var Directions = {Right:1, Left:2, Up:3, Down:4 };
var direction = Directions.Right;
var colors = ["gray", "yellow", "green", "blue", "white", "magenta", "blueviolet", "brown", "chartreuse", "cyan", "greenyellow", "orange", "lime"];
var xDir = -resolution;
var yDir = 0;
var score = 0;
var index = 0;
var gameOn = false;
function Define(){
$("#food").attr("width", resolution);
$("#food").attr("height", resolution);
var screen = $("#mySVG");
var screenX = screen.attr("width");
var screenY = screen.attr("height");
if (screenX % resolution != 0){
screen.attr("width", RoundByMultiple(screenX, resolution));
}
if (screenY % resolution != 0){
screen.attr("height", RoundByMultiple(screenY, resolution));
}
width_Screen = screen.attr("width");
heigth_Screen = screen.attr("height");
$("#svgText").attr("font-size", screenX/10 + "px");
for (var i = resolution; i < width_Screen; i+=resolution){
pointsX[index] = i;
index++;
}
index = 0;
for (var j = resolution; j < heigth_Screen; j+=resolution){
pointsY[index] = j;
index++;
}
}
function StartGame(){
$("#svgText").hide();
$("#food").show();
gameOn = true;
for (var i = 0; i <5; i++){
CreateRect((resolution*5) - (i*resolution), resolution, resolution, resolution);
}
RandomFood();
}
function CreateRect(x, y, w, h){
snake = $(document.createElementNS(svgNS,"rect"));
snake.attr("x",x);
snake.attr("y",y);
snake.attr("width",w);
snake.attr("height",h);
var a = false;
if (body.length >= 1){
while (!a){
c = RandomValues(colors.length);
if (body[body.length-1].attr("fill") != colors[c]){
a = true;
}
}
} else {
c = RandomValues(colors.length);
}
snake.attr("fill",colors[c]);
body.push(snake);
$("#mySVG").append(snake);
}
function Move(){
for (var i = body.length -1; i > 0; i--){
body[i].attr("x", body[i-1].attr("x"));
body[i].attr("y", body[i-1].attr("y"));
}
body[0].attr("x", body[0].attr("x") - xDir);
body[0].attr("y", body[0].attr("y") - yDir);
CheckEat();
CheckDeath();
}
function RandomFood(){
var X = RandomValues(pointsX.length);
var Y = RandomValues(pointsY.length);
$("#food").attr("x", pointsX[X]);
$("#food").attr("y", pointsY[Y]);
for (var i = 0; i < body.length; i++){
var bX = body[i].attr("x");
var bY = body[i].attr("y");
fX = $("#food").attr("x");
fY = $("#food").attr("y");
if (bX == fX && bY == fY){
RandomFood();
}
}
}
function CheckEat(){
bX = body[0].attr("x");
bY = body[0].attr("y");
if (bX == fX && bY == fY){
score++;
$("#score-display").html(score);
CreateRect(body[body.length-1].attr("x"),
body[body.length-1].attr("y"), resolution, resolution);
RandomFood();
}
}
function CheckDeath(){
for (var i = body.length-1; i >1; i--){
var aX = body[i].attr("x");
var aY = body[i].attr("y");
if (direction == Directions.Right || direction == Directions.Left){
if (bX - xDir == aX && bY == aY)
GameOver();
} if (direction == Directions.Up || direction == Directions.Down){
if (bX == aX && bY -yDir == aY)
GameOver();
}
}
if (bX < 0 || bX == width_Screen || bY < 0 || bY == heigth_Screen)
GameOver();
}
function GameOver(){
clearInterval(interval_a);
setTimeout(function() {
location.reload();
}, 1000);
}
function CheckKey(e) {
if (e.keyCode == "13" && !gameOn) {
StartGame();
}
if ((e.keyCode == "68" || e.keyCode == "39") && direction != Directions.Left){
xDir = -resolution;
yDir = 0;
direction = Directions.Right;
}
if ((e.keyCode == "65" || e.keyCode == "37") && direction != Directions.Right){
xDir = resolution;
yDir = 0;
direction = Directions.Left;
}
if ((e.keyCode == "87"|| e.keyCode == "38") && direction != Directions.Down){
xDir = 0;
yDir = resolution;
direction = Directions.Up;
}
if ((e.keyCode == "83" || e.keyCode == "40") && direction != Directions.Up){
xDir = 0;
yDir = -resolution;
direction = Directions.Down;
}
}
function RandomValues(value){
return Math.floor(Math.random() * value);
}
function RoundByMultiple(value, res){
return res*(Math.floor(value/res));
}
</script>
</head>
<body onload = "Define()">
<svg id = "mySVG" xmlns="http://www.w3.org/2000/svg" width = "400" height = "220" style = "background-color:#000000; border:2px solid blue">
<text id = "svgText" x="50%" y="50%" alignment-baseline="middle" text-anchor="middle" fill = "white"> Press enter to play</text>
<rect id = "food" x = "0" y = "0"fill = "red" style = "display:none"/>
</svg>
<div>
<h1>Your score: <span id ="score-display">0</span></h1>
</div>
</body>
</html>Imagem:
