焰火效果 利用图形学中的射线法，描绘焰火升空时的轨迹，然后再焰火收尾时，所有轨迹向一点隐没。-pyrotechnic effect, the use of graphics-ray method, depicts the fireworks launched at the track, and then the ending fireworks, all point to the path and disappeared.

gps 轨迹重现 使用gps 数据可以在 地图上 重现你走过的gps 路径-GPS track to reproduce the use of GPS data can be reproduced on the map gps path you walk