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ground.js
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ground.js
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const Jimp = require('jimp');
const fs = require('fs-extra');
/**
* @typedef {Object} InputValues
* @property {Array<Array<Number>>} grid
* @property {Number} min_x
* @property {Number} max_x
* @property {Number} min_y
* @property {Number} max_y
*/
/**
* @typedef {Object} SurroundingCoords
* @property {Number} N
* @property {Number} NW
* @property {Number} NE
* @property {Number} E
* @property {Number} W
* @property {Number} S
* @property {Number} SW
* @property {Number} SE
*/
const SAND = 0;
const CLAY = 1;
const FLOWING = 2;
const SETTLED = 3;
const ASCII_LOOKUP = {
[SAND]: '.',
[CLAY]: '#',
[FLOWING]: '|',
[SETTLED]: '~',
};
const LIGHT_GRAY = Jimp.cssColorToHex('#EAEAEA');
const BLACK = Jimp.cssColorToHex('#000000');
const RED = Jimp.cssColorToHex('#FF0000');
const CYAN = Jimp.cssColorToHex('#00FFFF');
const BLUE = Jimp.cssColorToHex('#0000FF');
class Point {
constructor(x, y) {
if (typeof x === 'string') {
// Treat string args as coordinates `x,y`
let [split_x, split_y] = x.split(',');
x = parseInt(split_x);
y = parseInt(split_y);
}
this.x = x;
this.y = y;
}
moveTo(x, y) {
if (typeof x === 'object') ({ x, y } = x);
this.x = x;
this.y = y;
}
moveNorth() {
this.y -= 1;
return this;
}
north() {
return new Point(this.x, this.y - 1);
}
moveSouth() {
this.y += 1;
return this;
}
south() {
return new Point(this.x, this.y + 1);
}
moveEast() {
this.x += 1;
return this;
}
east() {
return new Point(this.x + 1, this.y);
}
moveWest() {
this.x -= 1;
return this;
}
west() {
return new Point(this.x - 1, this.y);
}
getGrid(grid) {
return grid[this.y]?.[this.x];
}
toString() {
return `${this.x},${this.y}`;
}
}
class Grid {
constructor(raw_input) {
if (!raw_input) {
return this;
}
const { grid, min_x, max_x, min_y, max_y } = Grid.parseInput(raw_input);
this.grid = grid;
this.min_x = min_x;
this.max_x = max_x;
this.min_y = min_y;
this.max_y = max_y;
}
/**
* @param {String} num_or_range
* @example parseNumOrRange("100") // returns [100]
* @example parseNumOrRange("5..8") // returns [5, 6, 7, 8]
* @returns Array<Number>
*/
static parseNumOrRange(num_or_range) {
if (num_or_range.includes('..')) {
let [num_a, num_b] = num_or_range.split('..');
num_a = parseInt(num_a);
num_b = parseInt(num_b);
return Array(num_b - num_a + 1)
.fill()
.map((_, i) => num_a + i);
} else {
let num = parseInt(num_or_range);
if (Number.isNaN(num)) {
throw new Error(`Failed to parse "${num_or_range}"`);
}
return [num];
}
}
static toCoordString = ({ x, y }) => `${x},${y}`;
static isClayOrSettled(cell) {
return cell === CLAY || cell === SETTLED;
}
/**
* @param {String} raw_input Your raw input, with whitespace trimmed
* @returns {InputValues}
*/
static parseInput(raw_input) {
const grid_set = new Set();
const lines = raw_input.split('\n');
for (let raw_line of lines) {
let [, axis_a, range_a, axis_b, range_b] =
/^(x|y)=(\d+\.?\.?\d*), (x|y)=(\d+\.?\.?\d*)$/.exec(raw_line);
let nums_a = Grid.parseNumOrRange(range_a);
let nums_b = Grid.parseNumOrRange(range_b);
for (let a of nums_a) {
for (let b of nums_b) {
/**
* Part of the key is here: our input is given as xy or yx.
* By putting the values into an object and then destructuring,
* order doesn't matter: I always will get an `x,y` string.
*/
let key = Grid.toCoordString({ [axis_a]: a, [axis_b]: b });
grid_set.add(key);
}
}
}
const coords = [...grid_set].map((coord_str) =>
coord_str.split(',').map((v) => parseInt(v))
);
let min_x = Number.MAX_SAFE_INTEGER;
let max_x = 0;
let min_y = Number.MAX_SAFE_INTEGER;
let max_y = 0;
for (let [x, y] of coords) {
if (x < min_x) {
min_x = x;
}
if (x > max_x) {
max_x = x;
}
if (y < min_y) {
min_y = y;
}
if (y > max_y) {
max_y = y;
}
}
min_x -= 1;
max_x += 1;
// y doesn't get a row of "buffer," water only extends to maximum clay coord
/**
* 1. y starts at 0, so `max_y - 0 = max_y` (plus 1 for 0-indexed)
* 2. This stores extra 0s to pad the columns, but makes later calculations easier to not account for offsets
*/
const grid = Array(max_y + 1)
.fill()
.map((_) => Array(max_x + 1).fill(SAND));
for (let [x, y] of coords) {
grid[y][x] = CLAY;
}
return {
grid,
min_x,
max_x,
min_y,
max_y,
};
}
get trimmed() {
return Array(this.grid.length)
.fill()
.map((_, y) => this.grid[y].slice(this.min_x));
}
/**
* All "peeks" can be called with two params, x/y,
* or an object `{ x, y }`
*/
peekNorth(x, y) {
if (typeof x === 'object') ({ x, y } = x);
return this.grid[y - 1]?.[x];
}
peekSouth(x, y) {
if (typeof x === 'object') ({ x, y } = x);
return this.grid[y + 1]?.[x];
}
peekEast(x, y) {
if (typeof x === 'object') ({ x, y } = x);
return this.grid[y]?.[x + 1];
}
peekWest(x, y) {
if (typeof x === 'object') ({ x, y } = x);
return this.grid[y]?.[x - 1];
}
peek(x, y) {
if (typeof x === 'object') ({ x, y } = x);
return this.grid[y]?.[x];
}
mark({ x, y, fromX, toX, as: obj_as }, alt_as) {
if (this.grid[y] !== undefined) {
if (fromX !== undefined && toX !== undefined) {
let increment = fromX <= toX ? 1 : -1;
for (let px = fromX; px <= toX; px += increment) {
this.grid[y][px] = obj_as ?? alt_as;
}
} else {
this.grid[y][x] = obj_as ?? alt_as;
}
}
}
clone() {
const new_grid = new Grid();
new_grid.grid = JSON.parse(JSON.stringify(this.grid));
new_grid.min_x = this.min_x;
new_grid.max_x = this.max_x;
new_grid.min_y = this.min_y;
new_grid.max_y = this.max_y;
return new_grid;
}
toString(trimmed = true) {
return this.grid
.map((row) => {
let line = row.map((v) => ASCII_LOOKUP[v]).join('');
if (trimmed) {
line = line.slice(Math.max(this.min_x - 1, 0));
}
return line;
})
.join('\n');
}
sum() {
const sums = {
[SAND]: 0,
[CLAY]: 0,
[FLOWING]: 0,
[SETTLED]: 0,
};
for (let y = this.min_y; y <= this.max_y; y++) {
let row = this.grid[y];
for (let col of row) {
sums[col]++;
}
}
return sums;
}
}
let IMAGE_SLICE_CAMERA_Y = 0;
// This value was determined from running through everything once and noting what the max
// interval was between min and max y
const MAX_FRAME_HEIGHT = 175;
class Ground {
constructor({ grid, spring_x = 500, spring_y = 0 }) {
this.grid = grid;
this.original_grid = grid.clone();
this.spring_x = spring_x;
this.spring_y = spring_y;
}
static SAND = SAND;
static CLAY = CLAY;
static FLOWING = FLOWING;
static SETTLED = SETTLED;
async fill(output_frames = false) {
// Reset camera y coord, only useful if `output_frames` is true
IMAGE_SLICE_CAMERA_Y = 0;
const grid = this.grid.clone();
// Init with single drip
let drips = new Set([new Point(this.spring_x, this.spring_y)]);
const images = [];
while (drips.size > 0) {
if (output_frames) {
let image_buffer = await this.toImageSlice({
drips,
grid_instance: grid,
callback: async ({ image, drips, grid_instance }) => {
image = image.scale(2, Jimp.RESIZE_NEAREST_NEIGHBOR);
const buffer = await image.getBufferAsync(Jimp.MIME_PNG);
return buffer;
},
});
images.push(image_buffer);
}
let new_drips = [];
for (let drip of drips) {
if (drip.y >= this.grid.max_y) {
drips.delete(drip);
continue;
}
if (grid.peek(drip) === SETTLED) {
// Happen when two drips meet clay: the first one settles, 2nd one should skip
drip.moveNorth();
continue;
}
let below_drip = grid.peekSouth(drip);
if (below_drip === SAND) {
grid.mark(drip.moveSouth(), FLOWING);
} else if (Grid.isClayOrSettled(below_drip)) {
// Flow left
let left_drip = drip;
let barrier_left, flow_left;
while (!barrier_left && !flow_left) {
let below_left_drip = grid.peekSouth(left_drip);
if (!Grid.isClayOrSettled(below_left_drip)) {
// Will flow downwards
flow_left = left_drip;
} else if (Grid.isClayOrSettled(grid.peekWest(left_drip))) {
// Technically is space just to right of barrier
barrier_left = left_drip;
} else {
left_drip = left_drip.west();
}
}
// Flow right
let right_drip = drip;
let barrier_right, flow_right;
while (!barrier_right && !flow_right) {
let below_right_drip = grid.peekSouth(right_drip);
if (!Grid.isClayOrSettled(below_right_drip)) {
// Will flow downwards
flow_right = right_drip;
} else if (Grid.isClayOrSettled(grid.peekEast(right_drip))) {
// Technically is space just to left of barrier
barrier_right = right_drip;
} else {
right_drip = right_drip.east();
}
}
if (barrier_left && barrier_right) {
grid.mark({
y: barrier_left.y,
fromX: barrier_left.x,
toX: barrier_right.x,
as: SETTLED,
});
drip.moveNorth();
} else if (barrier_left && flow_right) {
grid.mark({
y: barrier_left.y,
fromX: barrier_left.x,
toX: flow_right.x,
as: FLOWING,
});
drip.moveTo(flow_right);
} else if (barrier_right && flow_left) {
grid.mark({
y: barrier_right.y,
fromX: flow_left.x,
toX: barrier_right.x,
as: FLOWING,
});
drip.moveTo(flow_left);
} else if (flow_left && flow_right) {
grid.mark({
y: flow_left.y,
fromX: flow_left.x,
toX: flow_right.x,
as: FLOWING,
});
drip.moveTo(flow_left);
new_drips.push(flow_right);
} else {
throw new Error('Should not happen');
}
} else {
// Already flowing, delete this drip
drips.delete(drip);
}
}
// Add all new drips after we finished our iterations (don't iterate over new drips in middle of loop)
for (let new_drip of new_drips) {
drips.add(new_drip);
}
// De-dup drips based on unique coordinates
let deduped_drip_coords = new Set([...drips].map((v) => v.toString()));
if (deduped_drip_coords.size < drips.size) {
let deduped_drips = new Set();
for (let drip_coord of deduped_drip_coords) {
deduped_drips.add(new Point(drip_coord));
}
drips = deduped_drips;
}
}
if (output_frames) {
// Creates frames folder if it doesn't exist
fs.emptyDirSync('frames');
const frames_length = String(images.length).length;
for (let i = 0; i < images.length; i++) {
let file = `frames/frame_${i
.toString()
.padStart(frames_length, '0')}.png`;
fs.writeFileSync(file, images[i]);
}
}
this.grid = grid;
return grid.sum();
}
/**
* @param {Object} options
* @param {Boolean} [options.trimmed]
* @param {Grid} [options.grid_instance]
* @param {Function} [options.callback] - Called with `({ image, grid_instance })`.
* @returns {Promise<Jimp|unknown>} Returns a Jimp instance, or the await'd return of `callback`
*/
async toImage({ trimmed = true, grid_instance = this.grid, callback } = {}) {
const grid = trimmed ? grid_instance.trimmed : grid_instance.grid;
const image = await new Promise((resolve, reject) => {
new Jimp(grid[0].length, grid.length, '#FFFFFF', (err, image) => {
if (err) {
reject(err);
} else {
resolve(image);
}
});
});
for (let y = 0; y < grid.length; y++) {
let row = grid[y];
for (let x = 0; x < row.length; x++) {
let cell = row[x];
switch (cell) {
case CLAY:
image.setPixelColor(BLACK, x, y);
break;
case FLOWING:
image.setPixelColor(CYAN, x, y);
break;
case SETTLED:
image.setPixelColor(BLUE, x, y);
break;
default:
break;
}
}
}
let spring_x = trimmed ? this.spring_x - grid_instance.min_x : this.spring_x;
image.setPixelColor(RED, spring_x, this.spring_y);
let return_value = image;
if (typeof callback === 'function') {
return_value = await callback({ image, grid_instance });
}
return return_value;
}
/**
* @param {Object} options
* @param {Set} [options.drips] - A Set of `Point` instances.
* @param {Grid} [options.grid_instance]
* @param {Function} [options.callback] - Called with `({ image, drips, grid_instance })`.
* @returns {Promise<Buffer>} Returns a PNG buffer, which can then be written out to a file
*/
async toImageSlice({ drips, grid_instance, callback } = {}) {
const grid = grid_instance.trimmed;
let min_y;
let max_y;
for (let drip of drips) {
if (max_y === undefined || drip.y > max_y) {
max_y = drip.y;
}
if (min_y === undefined || drip.y < min_y) {
min_y = drip.y;
}
}
min_y -= 40;
max_y += 40;
min_y = Math.max(min_y, 0);
max_y = Math.min(max_y, grid_instance.max_y);
if (max_y > IMAGE_SLICE_CAMERA_Y + MAX_FRAME_HEIGHT) {
IMAGE_SLICE_CAMERA_Y += max_y - (IMAGE_SLICE_CAMERA_Y + MAX_FRAME_HEIGHT);
}
const image = await new Promise((resolve, reject) => {
new Jimp(grid[0].length, MAX_FRAME_HEIGHT, '#FFFFFF', (err, image) => {
if (err) {
reject(err);
} else {
resolve(image);
}
});
});
for (
let y = IMAGE_SLICE_CAMERA_Y;
y <= IMAGE_SLICE_CAMERA_Y + MAX_FRAME_HEIGHT;
y++
) {
let row = grid[y];
if (!row) {
console.log('no row');
row = Array(grid[0].length).fill();
}
for (let x = 0; x < row.length; x++) {
let cell = row[x];
switch (cell) {
case SAND:
break;
case CLAY:
image.setPixelColor(BLACK, x, y - IMAGE_SLICE_CAMERA_Y);
break;
case FLOWING:
image.setPixelColor(CYAN, x, y - IMAGE_SLICE_CAMERA_Y);
break;
case SETTLED:
image.setPixelColor(BLUE, x, y - IMAGE_SLICE_CAMERA_Y);
break;
default:
image.setPixelColor(LIGHT_GRAY, x, y - IMAGE_SLICE_CAMERA_Y);
break;
}
}
}
if (IMAGE_SLICE_CAMERA_Y === 0) {
let spring_x = this.spring_x - grid_instance.min_x;
image.setPixelColor(RED, spring_x, this.spring_y);
}
let return_value = image;
if (typeof callback === 'function') {
return_value = await callback({ image, drips, grid_instance });
}
return return_value;
}
reset() {
this.grid = this.original_grid.clone();
}
toString(trimmed = true) {
let grid_str = this.grid.toString(trimmed);
let spring_x = trimmed ? this.spring_x - this.grid.min_x : this.spring_x;
// Spring is a '+' char in the first row
return grid_str.substring(0, spring_x) + '+' + grid_str.substring(spring_x + 1);
}
}
module.exports = {
Grid,
Ground,
};