import Voronoi from './modules/3rdparty/rhill-voronoi-core.js';
import Terrain from './modules/Terrain.js';
import Mouse from './modules/Mouse.js';

const $ = id => document.getElementById(id)

window.onload = () => {
	let canvas = document.createElement('canvas');
	const ct = canvas.getContext('2d');

	let render;

	let mouse = new Mouse(ct);

	const setCanvasSize = () => {
		canvas.setAttribute('width', window.innerWidth);
		canvas.setAttribute('height', window.innerHeight);
		const scale = Math.max(canvas.width, canvas.height);
		ct.scale(scale, scale);
		render();
	};
	window.addEventListener('resize', setCanvasSize);

	const terrain = new Terrain();
	render = () => {
		ct.clearRect(0, 0, 1, 1);
		terrain.renderGrid(ct);
		mouse.render(ct);
	};
	mouse.onMove = () => {
		terrain.applyBrush(mouse.x, mouse.y, (pt, strength) => {
			const lerp = (a, b, theta) => ((theta-1)*a) + (theta*b);
			pt.height = lerp(pt.height, pt.height + 10, strength);
		}, 1, mouse.radius);
		render();
	}

	setCanvasSize();
	
	const root = $('root');
	root.appendChild(canvas);
}