压缩包目录结构：
必须读我.txt
策汇在线.url
MQL4/
MQL4/Indicators/
MQL4/Indicators/Background Gradient.mq4

MQL4/Indicators/Background Gradient.mq4代码片段：
//+------------------------------------------------------------------+
//|                                          Background Gradient.mq4 |
//|                                   策汇在线  http://www.fxchs.com |
//|                                             http://www.fxchs.com |
//+------------------------------------------------------------------+


#property copyright "Copyright © 2020, 策汇在线  http://www.fxchs.com"
#property link      "http://www.fxchs.com"
#property strict

////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
//
// 介绍： 渐变色背景指标
//
// 原理： 通过在图表窗口中画不同颜色的矩形，实现渐变色背景
//
// 来自： 策汇在线: http://www.fxchs.com
//
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////


// 显示在图表窗口，非子窗口
#property indicator_chart_window

// 定义变量
double top, bottom;
datetime left;
int right_bound;
datetime right;
int r,g,b;

extern string topcol  ="125,000,000";        // 矩形上部分颜色
extern string bottomcol ="125,000,255";      // 矩形下部分颜色
extern int steps =100;                       // 中间矩形渐变个数

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{

   return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{
//----
   for(int x=1; x<=steps; x++)
   {
      ObjectDelete("Padding_rect"+ IntegerToString(x));
   }
//----
   return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
   int    counted_bars=IndicatorCounted();
   
   // 窗口纵坐标刻度最大值
   top =  WindowPriceMax();
   
   // 窗口纵坐标刻度最小值
   bottom = WindowPriceMin();
   
   // 得到坐标
   left = Time[WindowFirstVisibleBar()];
   right_bound=WindowFirstVisibleBar()-WindowBarsPerChart();
   if(right_bound<0) right_bound=0;
   right=Time[right_bound]+Period()*60;
   
   // 绘制矩形对象，stops表示多少个矩形叠加起来，每个矩形颜色不同，加在一起有渐变效果
   string tmp;
   for(int x=1; x<=steps; x++)
   {
      tmp = IntegerToString(x);
      if(ObjectFind("Padding_rect" + tmp ) ==-1) ObjectCreate("Padding_rect" + tmp,OBJ_RECTANGLE,0,left,top-((top-bottom)/steps)*(x-1),right,top-((top-bottom)/steps)*(x));
      ObjectSet("Padding_rect" + tmp, OBJPROP_TIME1, left);
      ObjectSet("Padding_rect" + tmp, OBJPROP_TIME2, right);
      ObjectSet("Padding_rect" + tmp, OBJPROP_PRICE1, top-((top-bottom)/steps)*(x-1));
      ObjectSet("Padding_rect" + tmp, OBJPROP_PRICE2, top-((top-bottom)/steps)*(x));
      
      // 将矩形移到K线后
      ObjectSet("Padding_rect" + tmp,OBJPROP_BACK,true);

      // 设置矩形颜色
      ObjectSet("Padding_rect" + tmp,OBJPROP_COLOR, ss2rgb(topcol, bottomcol,steps, x));//  RGB((128/steps*x),(128/steps*x),(255/steps*x)));
   }
   WindowRedraw();

   return(0);
}

// 输入颜色，步数，得到渐变颜色，简单的说就是两个颜色慢慢渐变色
int ss2rgb(string colour1, string colour2, int step, int index)
{
   int r1 = StrToInteger(StringSubstr(colour1, 0,3));
   int g1 = StrToInteger(StringSubstr(colour1, 4,3));
   int b1 = StrToInteger(StringSubstr(colour1, 8,3));

   int r2 = StrToInteger(StringSubstr(colour2, 0,3));
   int g2 = StrToInteger(StringSubstr(colour2, 4,3));
   int b2 = StrToInteger(StringSubstr(colour2, 8,3));

   if(r1>r2)
   {
      r = r1+((r2-r1)/step*index);
   }
   if(r1<r2)
   {
      r = r1-((r1-r2)/step*index);
   }

   if(g1>g2)
   {
      g = g1+((g2-g1)/step*index);
   }
   if(g1<g2)
   {
      g = g1-((g1-g2)/step*index);
   }

   if(b1>b2)
   {
      b = b1+((b2-b1)/step*index);
   }
   if(b1<b2)
   {
      b = b1-((b1-b2)/step*index);
   }

   g<<=4;
   b<<=15;
   return(r+g+b);
}