Clamp a float to be between [min, max).

Create a blank 2D canvas of a given width/height.

As above, but returing the 2D context object instead of the canvas. Note ctx.canvas is the canvas for the ctx, and can be use as an image.

Convert from degrees to radians

Convert from heading to radians

Return a Promise for getting an image.

use: imagePromise('./path/to/img').then(img => imageFcn(img)) or: await imagePromise('./path/to/img')

A true modulus function, differing from the % remainder operation.

Return random item from an array

Return promise for pause of ms. Use: await pause(ms)

Round a number to be of a given decimal precision. If the number is an array, round each item in the array

Convert from radians to degrees

Convert from radians to heading

Heading is 0-up (y-axis), clockwise angle measured in degrees. Radians is euclidean: 0-right (x-axis), counterclockwise in radians

Return a random float centered around r, in [-r/2, r/2)

Returns a random float in [0, max)

Returns a random float in [min, max)

Returns an int in [0, max), equal or grater than 0, less than max

Returns an int in [min, max), equal or grater than min, less than max

Install a seeded random generator as Math.random Uses an optimized version of the Park-Miller PRNG.

Math.random will return a sequence of "random" numbers in a known sequence. Useful for testing to see if the same results occur in multiple runs of a model with the same parameters.

Repeats the function f(i, a) i in 0, n-1. a is an optional array, default a new empty Array returns a, only needed if f() places data in a

Return an object with samples of the models components. Useful for testing Models without needing a View, just data.

Fill this context with the given image, resizing it to img size if needed.

Subtract two headings, returning the smaller difference.

Computes the difference between the given headings, that is, the number of degrees in the smallest angle by which heading2 could be rotated to produce heading1 See NetLogo's subtract-headings for explanation

Use pause for an animation loop. Calls the fcn each step Stops after steps calls, negative means run forever

Merge a module's obj key/val pairs into to the global/window namespace. Primary use is to make console logging easier when debugging modules.

Return Promise for ajax/xhr data.

type: 'arraybuffer', 'blob', 'document', 'json', 'text'. method: 'GET', 'POST' use: xhrPromise('./path/to/data').then(data => dataFcn(data))