dirvector

Only allow events to a handler if the gesture is headding in a certain direction.

Usage

director = dirvector(validator[, settings])

where validator is a function that takes a vector {direction: [PI ... -Pi], magnitude: [px]} and returns true or false if the vector is acceptable.

director is a function that takes takes a handler function (like a normal event handler) and returns a function that takes a component vector, like a MouseEvent our TouchMove, or anything that looks like {x: value, y: value}, validates the event using the validator, and if valid, calls the handler.

Example (much easier to understand..)

// require
var dirvector = require('dirvector');

//Make a director
var horizontalDirector = dirvector(dirvector.horizontal);

document.addEventListener('mousemove', horizontalDirector(function(){
    // Handler will only be called if the gesture is heading in a horizontal plane.
    console.log('horizontal');
}))

document.addEventListener('mouseup', horizontalDirector.reset);

Settings

• settings.magnitude: How far a stream of events must move before deciding whether they are valid or not.

• settings.getPosition: A function that takes the handler input (usually event) and returns a componant vector {x, y}