here_be_dragons/demo/www/index.js
2020-09-14 20:29:36 +02:00

100 lines
2.6 KiB
JavaScript

import {Cell, World} from "mapgen-demo";
import { memory } from "mapgen-demo/mapgen_demo_bg";
const CELL_SIZE = 12;
const GRID_COLOR = "#CCCCCC";
const DEAD_COLOR = "#FFFFFF";
const ALIVE_COLOR = "#000000";
var world = null;
const width = 80;
const height = 50;
const infoDiv = document.getElementById('map-info');
// Give the canvas room for all of our cells and a 1px border
// around each of them.
const canvas = document.getElementById("mapgen-canvas");
canvas.height = (CELL_SIZE + 1) * height + 1;
canvas.width = (CELL_SIZE + 1) * width + 1;
const ctx = canvas.getContext('2d');
// Map generators
function newCellularAutomata() {
var seed = Date.now();
world = World.new_cellular_automata(width, height, seed);
requestAnimationFrame(renderLoop);
infoDiv.textContent = "Cellular Automata with the seed: " + seed;
}
function newSimpleRooms() {
var seed = Date.now();
world = World.new_random_rooms(width, height, seed);
requestAnimationFrame(renderLoop);
infoDiv.textContent = "Random Rooms with the seed: " + seed;
}
const renderLoop = () => {
// universe.tick();
drawGrid();
drawCells();
requestAnimationFrame(renderLoop);
};
const drawGrid = () => {
ctx.beginPath();
ctx.strokeStyle = GRID_COLOR;
// Vertical lines.
for (let i = 0; i <= width; i++) {
ctx.moveTo(i * (CELL_SIZE + 1) + 1, 0);
ctx.lineTo(i * (CELL_SIZE + 1) + 1, (CELL_SIZE + 1) * height + 1);
}
// Horizontal lines.
for (let j = 0; j <= height; j++) {
ctx.moveTo(0, j * (CELL_SIZE + 1) + 1);
ctx.lineTo((CELL_SIZE + 1) * width + 1, j * (CELL_SIZE + 1) + 1);
}
ctx.stroke();
};
const getIndex = (row, column) => {
return row * width + column;
};
const drawCells = () => {
const tilesPtr = world.tiles();
const tiles = new Uint8Array(memory.buffer, tilesPtr, width * height);
ctx.beginPath();
for (let row = 0; row < height; row++) {
for (let col = 0; col < width; col++) {
const idx = getIndex(row, col);
ctx.fillStyle = tiles[idx] == Cell.Floor
? DEAD_COLOR
: ALIVE_COLOR;
ctx.fillRect(
col * (CELL_SIZE + 1) + 1,
row * (CELL_SIZE + 1) + 1,
CELL_SIZE,
CELL_SIZE
);
}
}
ctx.stroke();
};
newCellularAutomata();
// Connect UI element
document.getElementById('cellular-automata-option').addEventListener('click', newCellularAutomata);
document.getElementById('simple-rooms-option').addEventListener('click', newSimpleRooms);