mountain-generator/lib/functions/displacement-map.js

A package for generating svg mountains.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function default_1(height, points, displacement, roughness) {
    const pointsArray = [];
    //left point
    pointsArray[0] = height / 2 + Math.random() * displacement * 2 - displacement;
    //right point
    pointsArray[points] = height / 2 + Math.random() * displacement * 2 - displacement;
    displacement *= roughness;
    //loop through segments
    for (let index = 1; index < points; index *= 2) {
        //find center point of segment
        for (let point = points / index / 2; point < points; point += points / index) {
            pointsArray[point] = (pointsArray[point - points / index / 2] + pointsArray[point + points / index / 2]) / 2;
            pointsArray[point] += Math.random() * displacement * 2 - displacement;
        }
        displacement *= roughness;
    }
    return pointsArray;
}
exports.default = default_1;