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const canvas = document.getElementById('sand');
const ctx = canvas.getContext('2d');
canvas.width = window.innerWidth - 12;
canvas.height = window.innerHeight - 12;
const gridSize = 10;
const gridWidth = Math.floor(canvas.width / gridSize);
const gridHeight = Math.floor(canvas.height / gridSize);
const grid = Array(gridHeight).fill().map(() => Array(gridWidth).fill(0));
let mouseDown = false;
canvas.addEventListener('mousedown', (e) => {
mouseDown = true;
addSand(e);
});
canvas.addEventListener('mouseup', () => {
mouseDown = false;
});
canvas.addEventListener('mousemove', (e) => {
if (mouseDown) {
addSand(e);
}
});
function addSand(e) {
const rect = canvas.getBoundingClientRect();
const x = Math.floor((e.clientX - rect.left) / gridSize);
const y = Math.floor((e.clientY - rect.top) / gridSize);
if (x >= 0 && x < gridWidth && y >= 0 && y < gridHeight) {
grid[y][x] = 1;
}
}
const updateGrid = () => {
for (let y = gridHeight - 2; y >= 0; y--) {
for (let x = 0; x < gridWidth; x++) {
if (grid[y][x] === 1) {
if (grid[y + 1][x] === 0) {
grid[y][x] = 0;
grid[y + 1][x] = 1;
} else if (x > 0 && grid[y + 1][x - 1] === 0) {
grid[y][x] = 0;
grid[y + 1][x - 1] = 1;
} else if (x < gridWidth - 1 && grid[y + 1][x + 1] === 0) {
grid[y][x] = 0;
grid[y + 1][x + 1] = 1;
}
}
}
}
};
const drawGrid = () => {
// Clear the canvas
ctx.fillStyle = 'beige';
ctx.fillRect(0, 0, canvas.width, canvas.height);
// Draw the sand
ctx.fillStyle = 'black';
for (let y = 0; y < gridHeight; y++) {
for (let x = 0; x < gridWidth; x++) {
if (grid[y][x] === 1) {
ctx.fillRect(x * gridSize, y * gridSize, gridSize, gridSize);
}
}
}
};
const animate = () => {
updateGrid();
drawGrid();
requestAnimationFrame(animate);
};
animate();
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