phaser/v3/src/components/GetBounds.js

var GetBounds = {

    getBounds: function ()
    {
        var r = this.rotation;

        var wct = this.width * Math.cos(r);
        var hct = this.height * Math.cos(r);

        var wst = this.width * Math.sin(r);
        var hst = this.height * Math.sin(r);

        var x = this.x;
        var y = this.y;

        var xMin = x;
        var xMax = x;
        var yMin = y;
        var yMax = y;

        if (r > 0)
        {
            if (r < 1.5707963267948966)
            {
                // 0 < theta < 90
                yMax = y + hct + wst;
                xMin = x - hst;
                xMax = x + wct;
            }
            else
            {
                // 90 <= theta <= 180
                yMin = y + hct;
                yMax = y + wst;
                xMin = x - hst + wct;
            }
        }
        else
        {
            if (r > -1.5707963267948966)
            {
                // -90 < theta <= 0
                yMin = y + wst;
                yMax = y + hct;
                xMax = x + wct - hst;
            }
            else
            {
                // -180 <= theta <= -90
                yMin = y + wst + hct;
                xMin = x + wct;
                xMax = x - hst;
            }
        }

        return {
            x: xMin,
            y: yMin,
            width: xMax - xMin,
            height: yMax - yMin
        };
    }
};

module.exports = GetBounds;