求教布林带上下轨显价格画线报警能否实现?

#property indicator_chart_window #property indicator_buffers 3 #property indicator_color1 LightSeaGreen #property indicator_color2 LightSeaGreen #property indicator_color3 LightSeaGreen extern int BandsPeriod=20; extern int BandsShift=0; extern double BandsDeviations=2.0; extern int Target=240; double MovingBuffer; double UpperBuffer; double LowerBuffer; void init() { SetIndexStyle(0,DRAW_LINE); SetIndexStyle(0,DRAW_LINE); SetIndexBuffer(0,MovingBuffer); SetIndexStyle(1,DRAW_LINE); SetIndexBuffer(1,UpperBuffer); SetIndexStyle(2,DRAW_LINE); SetIndexBuffer(2,LowerBuffer); SetIndexDrawBegin(0,BandsPeriod+BandsShift); SetIndexDrawBegin(1,BandsPeriod+BandsShift); SetIndexDrawBegin(2,BandsPeriod+BandsShift); if(Period()0) limit++; for(i=0; iBandsPeriod-1) i=Bars-counted_bars-1; while(i>=0) { sum=0.0; k=i+BandsPeriod-1; oldval=MovingBuffer; while(k>=i) { newres=Close[k]-oldval; sum+=newres*newres; k--; } deviation=BandsDeviations *MathSqrt(sum/BandsPeriod); UpperBuffer=oldval+deviation; LowerBuffer=oldval-deviation; i--; } }

用得着这么麻烦吗，为什么在程序中不直接调用iBand函数呀，还要自己再算一遍。