花园场景，天空、大地、植物(茎、花、叶) 地形高度可编辑 植物数量、位置、颜色、自旋可编辑 面向对象封装完善，代码易于移植-Garden scene including sky, earth and plants (stems, flowers and leaves). Terrain height is editable. Number, position, color and spin of plants are editable. Object-oriented,