Team:Tianjin/Resources/JS:hahaha
(function() {
/////////////////////////////////////////////////////////////
// Canvas & Context
var canvas;
var ctx;
// Snake
var snake;
var snake_dir;
var snake_next_dir;
var snake_speed;
// Food
var food = {
x: 0,
y: 0
};
// Score
var score;
// Wall
var wall;
// HTML Elements
var screen_snake;
var screen_menus;
var screen_setting;
var screen_gameover;
var button_newgame_menus;
var button_newgame_setting;
var button_newgame_gameover;
var button_setting_menus;
var button_setting_gameover;
var ele_score;
var speed_setting;
var wall_setting;
/////////////////////////////////////////////////////////////
var activeDot = function(x, y) {
ctx.fillStyle = "#FFFFFF";
ctx.fillRect(x * 10, y * 10, 10, 10);
}
/////////////////////////////////////////////////////////////
var changeDir = function(key) {
if (key == 38 && snake_dir != 2) {
snake_next_dir = 0;
} else {
if (key == 39 && snake_dir != 3) {
snake_next_dir = 1;
} else {
if (key == 40 && snake_dir != 0) {
snake_next_dir = 2;
} else {
if (key == 37 && snake_dir != 1) {
snake_next_dir = 3;
}
}
}
}
}
/////////////////////////////////////////////////////////////
var addFood = function() {
food.x = Math.floor(Math.random() * ((canvas.width / 10) - 1));
food.y = Math.floor(Math.random() * ((canvas.height / 10) - 1));
for (var i = 0; i < snake.length; i++) {
if (checkBlock(food.x, food.y, snake[i].x, snake[i].y)) {
addFood();
}
}
}
/////////////////////////////////////////////////////////////
var checkBlock = function(x, y, _x, _y) {
return (x == _x && y == _y) ? true: false;
}
/////////////////////////////////////////////////////////////
var altScore = function(score_val) {
ele_score.innerHTML = String(score_val);
}
/////////////////////////////////////////////////////////////
var mainLoop = function() {
var _x = snake[0].x;
var _y = snake[0].y;
snake_dir = snake_next_dir;
// 0 - Up, 1 - Right, 2 - Down, 3 - Left
switch (snake_dir) {
case 0:
_y--;
break;
case 1:
_x++;
break;
case 2:
_y++;
break;
case 3:
_x--;
break;
}
snake.pop();
snake.unshift({
x: _x,
y: _y
});
// --------------------
// Wall
if (wall == 1) {
// On
if (snake[0].x < 0 || snake[0].x == canvas.width / 10 || snake[0].y < 0 || snake[0].y == canvas.height / 10) {
showScreen(3);
return;
}
} else {
// Off
for (var i = 0,
x = snake.length; i < x; i++) {
if (snake[i].x < 0) {
snake[i].x = snake[i].x + (canvas.width / 10);
}
if (snake[i].x == canvas.width / 10) {
snake[i].x = snake[i].x - (canvas.width / 10);
}
if (snake[i].y < 0) {
snake[i].y = snake[i].y + (canvas.height / 10);
}
if (snake[i].y == canvas.height / 10) {
snake[i].y = snake[i].y - (canvas.height / 10);
}
}
}
// --------------------
// Autophagy death
for (var i = 1; i < snake.length; i++) {
if (snake[0].x == snake[i].x && snake[0].y == snake[i].y) {
showScreen(3);
return;
}
}
// --------------------
// Eat Food
if (checkBlock(snake[0].x, snake[0].y, food.x, food.y)) {
snake[snake.length] = {
x: snake[0].x,
y: snake[0].y
};
score += 1;
altScore(score);
addFood();
activeDot(food.x, food.y);
}
// --------------------
ctx.beginPath();
ctx.fillStyle = "#000000";
ctx.fillRect(0, 0, canvas.width, canvas.height);
// --------------------
for (var i = 0; i < snake.length; i++) {
activeDot(snake[i].x, snake[i].y);
}
// --------------------
activeDot(food.x, food.y);
// Debug
//document.getElementById("debugs").innerHTML = snake_dir + " " + snake_next_dir + " " + snake[0].x + " " + snake[0].y;
setTimeout(mainLoop, snake_speed);
}
/////////////////////////////////////////////////////////////
var newGame = function() {
showScreen(0);
screen_snake.focus();
snake = [];
for (var i = 4; i >= 0; i--) {
snake.push({
x: i,
y: 15
});
}
snake_next_dir = 1;
score = 0;
altScore(score);
addFood();
canvas.onkeydown = function(evt) {
evt = evt || window.event;
changeDir(evt.keyCode);
}
mainLoop();
}
/////////////////////////////////////////////////////////////
// Change the snake speed...
// 150 = slow
// 100 = normal
// 50 = fast
var setSnakeSpeed = function(speed_value) {
snake_speed = speed_value;
}
/////////////////////////////////////////////////////////////
var setWall = function(wall_value) {
wall = wall_value;
if (wall == 0) {
screen_snake.style.borderColor = "#606060";
}
if (wall == 1) {
screen_snake.style.borderColor = "#FFFFFF";
}
}
/////////////////////////////////////////////////////////////
// 0 for the game
// 1 for the main menus
// 2 for the settings screen
// 3 for the game over screen
var showScreen = function(screen_opt) {
switch (screen_opt) {
case 0:
screen_snake.style.display = "block";
screen_menus.style.display = "none";
screen_setting.style.display = "none";
screen_gameover.style.display = "none";
break;
case 1:
screen_snake.style.display = "none";
screen_menus.style.display = "block";
screen_setting.style.display = "none";
screen_gameover.style.display = "none";
break;
case 2:
screen_snake.style.display = "none";
screen_menus.style.display = "none";
screen_setting.style.display = "block";
screen_gameover.style.display = "none";
break;
case 3:
screen_snake.style.display = "none";
screen_menus.style.display = "none";
screen_setting.style.display = "none";
screen_gameover.style.display = "block";
break;
}
}
/////////////////////////////////////////////////////////////
window.onload = function() {
canvas = document.getElementById("snake");
ctx = canvas.getContext("2d");
// Screens
screen_snake = document.getElementById("snake");
screen_menus = document.getElementById("menus");
screen_gameover = document.getElementById("gameover");
screen_setting = document.getElementById("setting");
// Buttons
button_newgame_menus = document.getElementById("newgame_menus");
button_newgame_setting = document.getElementById("newgame_setting");
button_newgame_gameover = document.getElementById("newgame_gameover");
button_setting_menus = document.getElementById("setting_menus");
button_setting_gameover = document.getElementById("setting_gameover");
// etc
ele_score = document.getElementById("score_value");
speed_setting = document.getElementsByName("speed");
wall_setting = document.getElementsByName("wall");
// --------------------
button_newgame_menus.onclick = function() {
newGame();
};
button_newgame_gameover.onclick = function() {
newGame();
};
button_newgame_setting.onclick = function() {
newGame();
};
button_setting_menus.onclick = function() {
showScreen(2);
};
button_setting_gameover.onclick = function() {
showScreen(2)
};
setSnakeSpeed(150);
setWall(1);
showScreen("menus");
// --------------------
// Settings
// speed
for (var i = 0; i < speed_setting.length; i++) {
speed_setting[i].addEventListener("click",
function() {
for (var i = 0; i < speed_setting.length; i++) {
if (speed_setting[i].checked) {
setSnakeSpeed(speed_setting[i].value);
}
}
});
}
// wall
for (var i = 0; i < wall_setting.length; i++) {
wall_setting[i].addEventListener("click",
function() {
for (var i = 0; i < wall_setting.length; i++) {
if (wall_setting[i].checked) {
setWall(wall_setting[i].value);
}
}
});
}
document.onkeydown = function(evt) {
if (screen_gameover.style.display == "block") {
evt = evt || window.event;
if (evt.keyCode == 32) {
newGame();
}
}
}
}
})();
