qt 的item更深层次的分析与设计，包括点的拾取，划图形，放大，缩小等。-qt the item deeper analysis and design, including pick up points, program graphics, zoom in, zoom out.

地震波相关处理，在拾取到时时采用的一种普遍方法-Seismic-related treatment, a common method often used to pick up

用于地震初至波的自动拾取，获取初至直达波的速度值(this program is used for automatically picking up the fisrt arrival wave of seismic record. with this, we can obtain the velocity value of direct wave)