求解，为何蓝色线无法显示
以下为程序，求解为何蓝色线无法显示出来，求指教===================================================================
//+------------------------------------------------------------------+
//| MA System.mq4 |
//| Philip Hall |
//| APP |
//+------------------------------------------------------------------+
#property copyright "Philip Hall"
#property link "APP"
#property version "1.00"
#property strict
#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 Red
#property indicator_color2 Blue
#property indicator_width1 2
#property indicator_width2 2
//指标参数设置
input int MA_1=5;
input int MA_2=8;
double MASystem_1[];
double MASystem_2[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int OnInit(void)
{
IndicatorDigits(Digits+1);
//--- indicator buffers mapping
SetIndexStyle(0,DRAW_LINE);
SetIndexStyle(1,DRAW_LINE);
SetIndexDrawBegin(0,MA_12);
SetIndexDrawBegin(1,MA_12);
SetIndexBuffer(0,MASystem_1);
SetIndexBuffer(1,MASystem_2);
//---
return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
const int prev_calculated,
const datetime &time[],
const double &open[],
const double &high[],
const double &low[],
const double &close[],
const long &tick_volume[],
const long &volume[],
const int &spread[])
{
int i,limit;
limit=rates_total-prev_calculated;
if(prev_calculated>0){limit++;};
for(i=0; i<limit; i++)
MASystem_1
=iMA(NULL,0,MA_1,0,MODE_EMA,PRICE_CLOSE,i);
MASystem_2
=iMA(NULL,0,MA_2,0,MODE_EMA,PRICE_CLOSE,i);
//---
//--- return value of prev_calculated for next call
return(rates_total);
}
//+------------------------------------------------------------------+
//| Timer function |
//+------------------------------------------------------------------+
void OnTimer()
{
//---
}
//+------------------------------------------------------------------+
我这里只显示了红线 所以求指教，是否哪里出了问题，为何蓝线无法显示
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