public void writeToParcel(Parcel out, int flags) {
        out.writeFloat(left);
        out.writeFloat(top);
        out.writeFloat(right);
        out.writeFloat(bottom);
    }
Write this viewport to the specified parcel. To restore a viewport from a parcel, use readFromParcel()

@param out The parcel to write the viewport's coordinates into
hellocharts-library/src/lecho/lib/hellocharts/model/Viewport.java