MapEventHandler.java 文件源码

@Override
public void mouseWheelMoved(MouseWheelEvent e) {
    int rotations = e.getWheelRotation();
    Point2D.Double loc = mapComponent.userToWorldSpace(e.getPoint());
    for (int i = 0; i < Math.abs(rotations); i++) {
        if (rotations < 0) {
            mapComponent.zoomIn(loc);
        } else {
            mapComponent.zoomOut(loc);
        }
    }
}