试图创建一个迷宫游戏,我先遇到麻烦,首先要使箭头键连接起来,然后又两个试图弄清楚如何找到玩家所在的位置,并确保他们不能穿过墙壁
const map = [
"WWWWWWWWWWWWWWWWWWWWW",
"W W W W W W",
"W W W WWW WWWWW W W W",
"W W W W W W W",
"W WWWWWWW W WWW W W W",
"W W W W W",
"W WWW WWWWW WWWWW W W",
"W W W W W W W",
"W WWWWW W W W WWW W F",
"S W W W W W W WWW",
"WWWWW W W W W W W W W",
"W W W W W W W W",
"W WWWWWWW WWWWW W W W",
"W W W W",
"WWWWWWWWWWWWWWWWWWWWW",
];
const maze = document.getElementById("maze")
let rowIndex;
let colIndex;
for (let rowNum = 0; rowNum < map.length; rowNum++) {
const rowString = map[rowNum]
let blockDiv = ""
// Loops through each column
for (let colNum = 0; colNum < rowString.length; colNum++) {
const blockType = rowString[colNum]
if (blockType === "W") {
blockDiv += "<div class='block wall'></div>"
} else if (blockType === "S") {
blockDiv += "<div class='block start'></div>"
rowIndex = rowNum
colIndex = colNum
} else if (blockType === "F") {
blockDiv += "<div class='block finish'></div>"
} else {
blockDiv += "<div class='block'></div>"
}
};
maze.innerHTML += `<div class='row'>${blockDiv}</div>`
}
最佳答案
这是一个很棒的项目!下面是我将如何做的简化版本。我试图根据需要添加尽可能多的评论。尝试理解它,如果有不清楚的地方,或者您想要其他地方,请不要犹豫。
您可以单击代码下方的蓝色按钮来尝试演示:
const map = [
"WWWWWWWWWWWWWWWWWWWWW",
"W W W W W W",
"W W W WWW WWWWW W W W",
"W W W W W W W",
"W WWWWWWW W WWW W W W",
"W W W W W",
"W WWW WWWWW WWWWW W W",
"W W W W W W W",
"W WWWWW W W W WWW W F",
"S W W W W W W WWW",
"WWWWW W W W W W W W W",
"W W W W W W W W",
"W WWWWWWW WWWWW W W W",
"W W W W",
"WWWWWWWWWWWWWWWWWWWWW",
],
maze = document.getElementById("maze"),
restartBtn = document.getElementById('restart-btn'),
blockSize = 10;
// Just for the demo, since we're in an iframe
// we display a warning to focus the window, and hide it on click
document.getElementById('warning')
.addEventListener('click', function(){ this.style.display = 'none'; });
// We declare those variables here so that they are accessible
// from anywhere. We will assign them values in the "startGame" function
let playerPos, playerElem, finishPos;
// We'll use this in the "bumpIntoWall" function
let wallBumpTimer;
// Listen for arrow keys, and reset button click
setupEventListeners();
startGame();
function startGame() {
const classMap = {'W': 'wall', 'S': 'start', 'F': 'finish'};
// Empty the maze in case we already played before
maze.innerHTML = '';
// Create the player element
playerElem = document.createElement('div');
playerElem.className = 'player';
maze.appendChild(playerElem);
// For each row
map.forEach((rowString, y) => {
const row = document.createElement('div');
row.className = 'row';
maze.appendChild(row);
// For each cell
rowString.split('').forEach((blockType, x) => {
const block = document.createElement('div');
block.className = `block ${classMap[blockType] || ''}`;
row.appendChild(block);
// Set the player and finish positions as we encounter them
if (blockType === 'S') { setPlayerPos(x, y); }
else if (blockType === 'F') { finishPos = { x, y }; }
});
});
}
function setupEventListeners() {
// When a key is pressed
addEventListener('keydown', e => {
const { x, y } = playerPos;
// Try to move in the direction of the arrow
switch(e.keyCode) {
case 37: moveTo(x - 1, y ); break; // Left
case 38: moveTo(x, y - 1); break; // Up
case 39: moveTo(x + 1, y ); break; // Right
case 40: moveTo(x, y + 1); break; // Down
}
// Prevent scrolling if an arrow key is pressed
if ([37, 38, 39, 40].includes(e.keyCode)) {
e.preventDefault();
}
});
// When we click on restart, restart
restartBtn.addEventListener('click', startGame);
}
function setPlayerPos(x, y) {
// Update the variable
playerPos = { x, y };
// Update the screen
playerElem.style.left = x * blockSize + 'px';
playerElem.style.top = y * blockSize + 'px';
// Display an alert if we won
checkIfWin();
}
function checkIfWin() {
// If the player is on the finish position
if (playerPos.x === finishPos.x && playerPos.y === finishPos.y) {
// Wait a little for the position to be updated visually, with setTimeout
setTimeout(() => {
alert("Congratulations! You made it :)");
}, 200);
}
}
function getBlockByPosition(x, y) {
// Returns the corresponding HTML block
return document.querySelector(`.row:nth-child(${y+1}) .block:nth-child(${x+1})`);
}
function getBlockTypeByPosition(x, y) {
// Returns the block's letter ("W", "S", ...)
return map[y].charAt(x);
}
function moveTo(x, y) {
// Check if we are within the maze and not on a wall
const isMoveAllowed = (
x >= 0 && x < map[0].length &&
y >= 0 && y < map.length &&
getBlockTypeByPosition(x, y) !== 'W'
);
if (isMoveAllowed) { setPlayerPos(x, y); }
else { bumpIntoWall(x, y); }
}
function bumpIntoWall(nextX, nextY) {
const { x, y } = playerPos;
// Find out which direction the player wanted to go towards
const direction = (nextX < x && 'left') ||
(nextY < y && 'up') ||
(nextX > x && 'right')||
'down';
clearBumpAnimation();
// Add a class temporarily to play an animation
playerElem.classList.add(`bump-${direction}`);
maze.classList.add('red');
wallBumpTimer = setTimeout(clearBumpAnimation, 200);
}
function clearBumpAnimation() {
clearTimeout(wallBumpTimer);
playerElem.classList.remove('bump-left', 'bump-up', 'bump-right', 'bump-down');
maze.classList.remove('red');
}
#warning { position: fixed; background: rgba(255, 255, 255, 0.8); top: 0; left: 0; width: 100%; height: 100%; padding: 30px; text-align: center; font-size: 20px; font-family: Arial, Helvetica, sans-serif; }
#maze { position: relative; }
.row { clear: both; }
.block {
width: 10px;
height: 10px;
background: #f2f2f2;
float: left;
}
.block.wall { background: #ccc; transition: background .2s ease; }
.red .block.wall { background: #d8a2a2; }
.block.start { background: #45aed6; }
.block.finish { background: #44ffc2; }
.player {
position: absolute;
transition: left .2s ease, top .2s ease;
width: 10px;
height: 10px;
background: #f00;
border-radius: 10px;
}
/* Wall bump animation */
.player.bump-left { width: 8px; }
.player.bump-up { height: 8px; }
.player.bump-right { width: 8px; margin-left: 2px; }
.player.bump-down { height: 8px; margin-top: 2px; }
<button id="restart-btn">Restart</button>
<div id="maze"></div>
<div id="warning"><b>Click here</b> to focus the window,<br>and use the arrow keys to move.</div>