Method union

packages/fairygui/src/utils/MathTypes.ts:139–147

(other: IRectangle, out?: Rectangle)

    }

    public union(other: IRectangle, out?: Rectangle): Rectangle {
        const x = Math.min(this.x, other.x);
        const y = Math.min(this.y, other.y);
        const right = Math.max(this.right, other.x + other.width);
        const bottom = Math.max(this.bottom, other.y + other.height);

        out = out || new Rectangle();
        return out.set(x, y, right - x, bottom - y);
    }

    public isEmpty(): boolean {
        return this.width <= 0 || this.height <= 0;