Added para datasource to database, modified calling method of database

tl.py

@@ -42,8 +42,16 @@ def main():
     
         from pyat.tlcore import call_tl
         import numpy as np
-        [ranges, depths, TL, bathym] = call_tl(ETOPO1Path, STPath, freq=freq, sourceDepth=sourceDepth, sourceLat=sLat, sourceLon=sLon, receiveDepth=receiveDepth,
-                receiveLat=rLat, receiveLon=rLon, timeType=timeType, modelType=modelType, isPlot=png)
+        
+        # 定义时间段
+        timeIndex = timeType
+        # 创建类
+        database = DataBase(ETOPO1Path, STPath)
+        # 设置时间段
+        database.set_timePeriod(timeIndex)
+
+        [ranges, depths, TL, bathym] = call_tl(database=database, freq=freq, sourceDepth=sourceDepth, sourceLat=sLat, sourceLon=sLon, receiveDepth=receiveDepth,
+                receiveLat=rLat, receiveLon=rLon, modelType=modelType, isPlot=png)
 
         # write data to file                
         # 保存地形数据