phaser/v3/src/geom/intersects/GetRectangleIntersection.js

var Rectangle = require('../rectangle/Rectangle');
var RectangleToRectangle = require('./RectangleToRectangle');

var GetRectangleIntersection = function (rectA, rectB, output)
{
    if (output === undefined) { output = new Rectangle(); }

    if (RectangleToRectangle(rectA, rectB))
    {
        output.x = Math.max(rectA.x, rectB.x);
        output.y = Math.max(rectA.y, rectB.y);
        output.width = Math.min(rectA.right, rectB.right) - output.x;
        output.height = Math.min(rectA.bottom, rectB.bottom) - output.y;
    }

    return output;
};

module.exports = GetRectangleIntersection;