Noise Map

A procedural 2D map generator based on Perlin / simplex noise

Example

Usage

Create a Canvas in your HTML code:

<canvas id="map-canvas" width="800" height="400"></canvas>

Create a HeightMap with the MapGenerator in your JS code:

var NoiseMap = require('noise-map');

var generator = new NoiseMap.MapGenerator();
var heightmap = generator.createMap(400, 200, {type: 'perlin'});

var context = document.getElementById('map-canvas').getContext('2d');
heightmap.draw(context, 800, 400, NoiseMap.STYLE.GRAY);

API

This module allows you to create random heightmaps with Perlin and simplex noise, edit their data with utility methods, and display them on a Canvas.

The module exposes four items:

• MapGenerator: A configurable map constructor
• HeightMap: A data container for noise values
• STYLE: An enum for the map rendering style
• Colorizer: An internal map rendering tool

MapGenerator

new MapGenerator(seed = random(), configuration = {})

Instantiate a new MapGenerator, that can be used repeatedly to create different maps. You usually need only one MapGenerator.

Arguments:

seed: optionnal, an integer used a a seed for the noise functions

configuration: optionnal, an object describing the current configuration of this generator:

• type: The algorithm used for noise values ("simplex" or "perlin")
• amplitude: The base amplitude for noise values (default: 1)
• frequency: The base frequency for noise values (default: 0.5)
• amplitudeCoef: The amplitude modifier for noise values (default: 0.5)
• frequencyCoef: The frequency modifier for noise values (default: 0.5)
• generateSeed: Toggle the generation of a new seed before map creation (default: false)

setSeed(seed)

setConfig(config)

newMap(width, height, config = {})

Return a new HeightMap with the input dimensions, and fill it wil random values in [0, 1];

HeightMap

new HeightMap(width, height, data = [])

Create a new HeightMap with dimensions (width, height).

The argument data is an optionnal 1D Array containing the values of the heightmap.

get(x, y)

Get the value at (x, y)

set(x, y, value)

Set the value at (x, y) to value

scaleValues(coef)

Exponentially scale the values of the heightmap, by a coefficient coef;

stepValues(n)

Floor the values of the heightmap, resulting in n steps;

inverseValues()

Inverse the values of the heightmap

draw(context, outputWidth, outputHeight, style = STYLE.GRAY, enableShadow = false)

• context: The 2D context from a Canvas element
• outputWidth: The width for the output map display
• outputHeight: The height for the output map display
• style: Set the style, which defines the color used
• enableShadow: Toggle the shadow on the map

The style can be one of: STYLE.GRAY, STYLE.REALISTIC, STYLE.GEOLOGIC, STYLE.HEATMAP

Installation

You can install the module with npm:

npm install noise-map

You can import the module with unpkg:

<script type="text/javascript" src="https://unpkg.com/noise-map@latest"></script>

You can clone the repository & include the noise-map.js file in your project:

git clone https://github.com/ogus/noise-map.git

License

This project is licensed under the WTFPL - see LICENSE for more details