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index.html
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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<canvas id="canvas"></canvas><br>
<button onclick="pause()">Start / Pause</button>
<button onclick="location.reload()">Reload</button>
<p id="status">Status: Paused</p>
<script>
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext("2d");
let board = [];
let openSet = [];
let closedSet = [];
let start, end, path = [], over = false;
let current, interval, paused = true;
let width = 50, height = 35;
canvas.width = 15 * width;
canvas.height = 15 * height;
class Spot
{
constructor(x, y)
{
this.f = this.g = this.h = 0;
this.x = x, this.y = y;
this.neighbours = [];
this.previous = null;
this.isObstacle = Math.random() < 0.15;
}
}
for (let x = 0; x < width; x++)
{
board.push([]);
for (let y = 0; y < height; y++)
{
board[board.length - 1][y] = new Spot(x, y);
}
}
function heuristic(a, b)
{
return dist(a.x, a.y, b.x, b.y);
}
function dist(x1, y1, x2, y2)
{
let a = x1 - x2;
let b = y1 - y2;
return Math.abs(a) + Math.abs(b);
}
start = board[0][0];
end = board[width - 1][height - 1];
start.isObstactle = false;
end.isObstacle = false;
openSet.push(start);
function displayBoard(board)
{
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = "grey";
ctx.fillRect(0, 0, canvas.width, canvas.height);
for (let arr in board)
{
for (let tile in board[arr])
{
let t = board[arr][tile];
ctx.fillStyle = t.isObstacle ? "black" : "white";
ctx.fillRect(t.x * 15 + 2, t.y * 15 + 2, 14, 14);
}
}
for (let tile of closedSet)
{
ctx.fillStyle = "rgba(255, 0, 0, 1)";
ctx.fillRect(tile.x * 15 + 2, tile.y * 15 + 2, 14, 14);
}
for (let tile of openSet)
{
ctx.fillStyle = "rgba(0, 255, 0, 1)";
ctx.fillRect(tile.x * 15 + 2, tile.y * 15 + 2, 14, 14);
}
let temp = current;
path = [temp];
while (temp.previous)
{
path.push(temp.previous);
temp = temp.previous;
}
for (let tile of path)
{
ctx.fillStyle = "rgba(0, 0, 255, 1)";
ctx.fillRect(tile.x * 15 + 2, tile.y * 15 + 2, 14, 14);
}
}
function update()
{
if (openSet.length === 0)
{
console.log("No solution");
document.getElementById("status").innerHTML = "Status: No solution";
clearInterval(interval);
}
else
{
let winner = 0;
for (let i = 0; i < openSet.length; i++)
{
if (openSet[i].f < openSet[winner].f)
{
winner = i;
}
}
current = openSet[winner];
if (current === end)
{
let temp = current;
path = [temp];
while (temp.previous)
{
path.push(temp.previous);
temp = temp.previous;
}
console.log("Solution found");
document.getElementById("status").innerHTML = "Status: Solution found";
clearInterval(interval);
}
closedSet.push(current);
removeFromArray(openSet, current);
for (let n of current.neighbours)
{
if (closedSet.includes(n)) { continue }
let tempG = current.g + 1;
if (openSet.includes(n))
{
if (tempG < n.g)
{
n.g = tempG;
}
}
else
{
n.g = tempG;
openSet.push(n);
}
n.h = heuristic(n, end);
n.f = n.g + n.h;
n.previous = current;
}
}
displayBoard(board);
}
function removeFromArray(array, element)
{
for (let i = array.length - 1; i > -1; i--)
{
if (array[i] === element)
{
array.splice(i, 1);
}
}
}
function addNeighbours()
{
for (let x = 0; x < width; x++)
{
for (let y = 0; y < height; y++)
{
let spot = board[x][y];
let left = getTileAtPos(x - 1, y);
let right = getTileAtPos(x + 1, y);
let up = getTileAtPos(x, y - 1);
let down = getTileAtPos(x, y + 1);
left && !left.isObstacle && spot.neighbours.push(left);
right && !right.isObstacle && spot.neighbours.push(right);
up && !up.isObstacle && spot.neighbours.push(up);
down && !down.isObstacle && spot.neighbours.push(down);
}
}
}
addNeighbours();
function getTileAtPos(x, y)
{
if (typeof board[x] === "undefined" ||
typeof board[x][y] === "undefined")
{
return false;
}
return board[x][y];
}
window.addEventListener("keydown", event =>
{
if (event.key === " ")
{
pause();
}
});
function pause()
{
if (over) { return }
paused = !paused;
document.getElementById("status").innerHTML = paused ? "Status: Paused" : "Status: Ongoing";
}
interval = window.setInterval(function()
{
!paused && update();
}, 25);
displayBoard(board);
</script>
</body>
</html>