你试试看这个函数.可以直接得到当前光标位置的数据。
series1.GetCursorValues(Var XValue, YValue: Double);
procedure GetCursorValues(Var XValue, YValue: Double);
Unit
TeEngine
Description
The GetCursorValues method returns the corresponding Series X and Y values where mouse cursor is over. The X and Y values correspond to the Series associated Axis scales. One example of this can be found at teedemo.dpr example project under "Cross-Hair" (ucrossh.pas) unit.