Script for Spark AR, make SceneObject dragable with TouchGestures.

Dragable.js

// const Scene = require('Scene');
// new Dragable(Scene.root.find('plane0'));

function Dragable(object) {
    const CameraInfo = require('CameraInfo');
    const TouchGestures = require('TouchGestures');

    const width = CameraInfo.previewSize.width;
    const height = CameraInfo.previewSize.height;

    let widthMax = width.div(height).mul(25);
    let widthMin = widthMax.mul(-1);

    TouchGestures.onPan(object).subscribe(event => {
        object.transform.x = RemapSingal(event.location.x, Reactive.val(0), width, widthMin, widthMax);
        object.transform.y = RemapSingal(event.location.y, Reactive.val(0), height, Reactive.val(25), Reactive.val(-25));
    });

    TouchGestures.onPinch(object).subscribe(event => {
        const sx = object.transform.scaleX.pinLastValue();
        object.transform.scaleX = Reactive.mul(sx, event.scale);

        const sy = object.transform.scaleY.pinLastValue();
        object.transform.scaleY = Reactive.mul(sy, event.scale);
    });

    TouchGestures.onRotate(object).subscribe(event => {
        object.transform.rotationZ = Reactive.add(object.transform.rotationZ.pinLastValue(), Reactive.mul(-1, event.rotation));
    });
}