add basic color brushing demo

1 files changed, 0 insertions, 111 deletions

diff --git a/src/modules/Terrain.js b/src/modules/Terrain.js
deleted file mode 100644
index 21908ac..0000000
--- a/src/modules/Terrain.js
+++ /dev/null
@@ -1,111 +0,0 @@
-'use strict';
-
-import Voronoi from './3rdparty/rhill-voronoi-core.js';
-
-import { useAverage } from './Util.js';
-import { AABB, QuadTree } from './Geometry.js';
-
-
-/* from here on up, we always assume that points live in the range [(0,0), (1,1)) */
-
-function lloydRelax(point_set, density) {
-	/* setup quadtree and averages */
-	let tree = new QuadTree(1,1);
-	let averages = {};
-	for (let i=0; i<point_set.length; i++) {
-		const point = point_set[i];
-		point.index = i;
-		tree.insert(point);
-
-		let [avg, append] = useAverage();
-		const cent_x = { avg, append };
-		[avg, append] = useAverage();
-		const cent_y = { avg, append };
-		averages[i] = { cent_x, cent_y };
-	}
-
-	/* compute average centroids */
-	for (let x=0; x<1; x += 1/density) {
-		for (let y=0; y<1; y += 1/density) {
-			const point = { x, y };
-			const closest = tree.closest(point);
-			const { cent_x, cent_y } = averages[closest.index];
-			cent_x.append(point.x);
-			cent_y.append(point.y);
-		}
-	}
-
-	/* return centroid points */
-	const result = [];
-	for (let i=0; i<point_set.length; i++) {
-		const point = { x: averages[i].cent_x.avg(), y: averages[i].cent_y.avg() };
-		result.push(point);
-	}
-	return result;
-}
-
-
-class Terrain {
-	constructor() {
-		const N_SEED_POINTS = 2**12;
-		const N_RELAX_ITERATIONS = 1;
-		const RELAX_DENSITY = 400;
-		const randomPoint = () => ({x: Math.random(), y: Math.random()});
-
-		this.min_height = 0;
-		this.max_height = 0;
-
-		let seed_points = [];
-		for (let i=0; i<N_SEED_POINTS; i++) seed_points.push(randomPoint());
-
-		for (let i=0; i<N_RELAX_ITERATIONS; i++)
-			lloydRelax(seed_points, RELAX_DENSITY);
-
-		const v = new Voronoi();
-		this.graph = v.compute(seed_points, {xl: 0, xr: 1, yt: 0, yb: 1});
-
-		this.tree = new QuadTree(1,1);
-		for (let v of this.graph.vertices) {
-			v.height = 0;
-			this.tree.insert(v);
-		}
-	}
-
-
-	applyBrush(x, y, f, strength, radius) {
-		const region = new AABB(x-radius, y-radius, 2*radius, 2*radius);
-		const points = this.tree.root.getPointsInRegion(region);
-		
-		const dist2 = (a, b) => (a.x - b.x)**2 + (a.y - b.y)**2;
-
-		const sigma = radius/3;
-		const beta = 1/(2*sigma*sigma);
-		const center = { x, y };
-		const power = pt => Math.exp(-beta * dist2(pt, center));
-		
-		for (let pt of points) f(pt, strength * power(pt));
-	}
-
-
-	renderGrid(ct) {
-		ct.save();
-		ct.lineWidth = 0.001;
-		for (let edge of this.graph.edges) {
-			ct.fillStyle = `hsl(${edge.va.height}, 100%, 50%)`;
-			ct.beginPath();
-			ct.arc(edge.va.x, edge.va.y, 0.005, 0, 2*Math.PI);
-			ct.closePath();
-			ct.fill();
-
-			ct.beginPath();
-			ct.moveTo(edge.va.x, edge.va.y);
-			ct.lineTo(edge.vb.x, edge.vb.y);
-			ct.closePath();
-			ct.stroke();
-		}
-		ct.restore();
-	}
-}
-
-export { lloydRelax };
-export default Terrain;