趋势指标柱状图

#property copyright   "XAUOF Indicator Workshop"
#property version     "1.00"
#property strict
#property indicator_separate_window
#property indicator_buffers 2
#property indicator_plots   2

// 上升柱（绿色）
#property indicator_type1   DRAW_HISTOGRAM
#property indicator_color1  clrLime
#property indicator_width1  3
#property indicator_label1  "Up"

// 下降柱（红色）
#property indicator_type2   DRAW_HISTOGRAM
#property indicator_color2  clrRed
#property indicator_width2  3
#property indicator_label2  "Down"

//--- 输入参数
input int    FastMAPeriod   = 10;   // 快速均线周期
input int    FastMAMethod   = 1;    // 快速均线方法（0=SMA, 1=EMA, 2=SMMA, 3=LWMA）
input int    FastMAApplyTo  = 0;    // 快速均线应用价格（0=收盘价）
input int    SlowMAPeriod   = 1;    // 慢速均线周期
input int    SlowMAMethod   = 1;    // 慢速均线方法
input int    SlowMAApplyTo  = 0;    // 慢速均线应用价格

//--- 指标缓冲区
double UpBuffer[];
double DownBuffer[];

//--- 均线句柄和临时缓冲区
int    fastMAHandle;
int    slowMAHandle;
double fastMA[];
double slowMA[];

//+------------------------------------------------------------------+
//| 自定义指标初始化函数                                               |
//+------------------------------------------------------------------+
int OnInit()
{
   // 创建快速均线句柄
   fastMAHandle = iMA(_Symbol, PERIOD_CURRENT, FastMAPeriod, 0, 
                      (ENUM_MA_METHOD)FastMAMethod, (ENUM_APPLIED_PRICE)FastMAApplyTo);
   if(fastMAHandle == INVALID_HANDLE)
   {
      Print("创建快速均线句柄失败");
      return INIT_FAILED;
   }
   
   // 创建慢速均线句柄
   slowMAHandle = iMA(_Symbol, PERIOD_CURRENT, SlowMAPeriod, 0, 
                      (ENUM_MA_METHOD)SlowMAMethod, (ENUM_APPLIED_PRICE)SlowMAApplyTo);
   if(slowMAHandle == INVALID_HANDLE)
   {
      Print("创建慢速均线句柄失败");
      return INIT_FAILED;
   }
   
   // 绑定缓冲区
   SetIndexBuffer(0, UpBuffer, INDICATOR_DATA);
   SetIndexBuffer(1, DownBuffer, INDICATOR_DATA);
   
   // 设置空值
   PlotIndexSetDouble(0, PLOT_EMPTY_VALUE, 0);
   PlotIndexSetDouble(1, PLOT_EMPTY_VALUE, 0);
   
   // 分配临时缓冲区
   ArraySetAsSeries(fastMA, false);
   ArraySetAsSeries(slowMA, false);
   ArraySetAsSeries(UpBuffer, false);
   ArraySetAsSeries(DownBuffer, false);
   
   return INIT_SUCCEEDED;
}

//+------------------------------------------------------------------+
//| 自定义指标计算函数                                                 |
//+------------------------------------------------------------------+
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[])
{
   // 等待指标计算完成
   if(BarsCalculated(fastMAHandle) < rates_total) return 0;
   if(BarsCalculated(slowMAHandle) < rates_total) return 0;
   
   // 拷贝均线数据
   if(CopyBuffer(fastMAHandle, 0, 0, rates_total, fastMA) < rates_total) return 0;
   if(CopyBuffer(slowMAHandle, 0, 0, rates_total, slowMA) < rates_total) return 0;
   
   // 确定计算起点
   int start = (prev_calculated > 0) ? prev_calculated - 1 : MathMax(FastMAPeriod, SlowMAPeriod);
   
   // 首次计算时初始化
   if(prev_calculated == 0)
   {
      ArrayInitialize(UpBuffer, 0);
      ArrayInitialize(DownBuffer, 0);
   }
   
   // 计算柱状图
   for(int i = start; i < rates_total && !IsStopped(); i++)
   {
      double diff = fastMA[i] - slowMA[i]; // 快慢线差值
      
      if(diff > 0)
      {
         // 快线在上，画绿柱
         UpBuffer[i] = diff;
         DownBuffer[i] = 0;
      }
      else
      {
         // 快线在下，画红柱
         UpBuffer[i] = 0;
         DownBuffer[i] = diff;
      }
   }
   
   return rates_total;
}

//+------------------------------------------------------------------+
//| 自定义指标清理函数                                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   // 释放指标句柄
   if(fastMAHandle != INVALID_HANDLE) IndicatorRelease(fastMAHandle);
   if(slowMAHandle != INVALID_HANDLE) IndicatorRelease(slowMAHandle);
}
//+------------------------------------------------------------------+