MQL5變色線畫法（比MQL4更簡(jiǎn)單） [MT4]
作者：
MT4 來(lái)源：
cxh99.com 發(fā)布時(shí)間：2012年05月28日 點(diǎn)擊數(shù)：
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- MQL5里有一種特殊指標(biāo)數(shù)組“顏色數(shù)組”，他是和畫線的指標(biāo)數(shù)組配合使用的。通過對(duì)他的簡(jiǎn)單賦值可以使畫出的線變色。
首先要在指標(biāo)頭部定義里指定一條線對(duì)應(yīng)的數(shù)組是要使用變色畫線方式，指定方法是：
#property indicator_typeX DRAW_COLOR_LINE
這里X代表畫線的數(shù)組序號(hào)
DRAW_COLOR_LINE代表畫線，此外還可以有如下畫線方式：
復(fù)制代碼-
- DRAW_COLOR_LINE
- Colorful Line彩色線
- DRAW_COLOR_SECTION
- Multicolored section彩色塊
- DRAW_COLOR_HISTOGRAM
- Multicolored histogram from the zero line彩色柱狀圖
- DRAW_COLOR_HISTOGRAM2
- Multicolored histogram of the two indicator buffers彩色柱狀圖2
- DRAW_COLOR_ARROW
- Drawing colored arrows彩色箭頭
- DRAW_COLOR_ZIGZAG
- Colorful ZigZag彩色ZigZag
- DRAW_COLOR_BARS
- Multi-colored bars彩色竹線圖
- DRAW_COLOR_CANDLES
- Multi-colored candles彩色蠟燭圖
然后緊跟一個(gè)顏色的定義語(yǔ)句：
#property indicator_colorX Red,Green
兩個(gè)顏色之間用逗號(hào)分隔
============================================
針對(duì)上面程序頭部的定義，之后要開始全局?jǐn)?shù)組的定義。
這里要注意實(shí)現(xiàn)變色需要針對(duì)一條線使用兩個(gè)數(shù)組，
例如：
double bMaBuffer[],bColorBuffer[];
然后進(jìn)入OnInit事件進(jìn)行兩個(gè)數(shù)組的分別設(shè)定：
SetIndexBuffer(0,bMaBuffer,INDICATOR_DATA);//INDICATOR_DATA表示是用于畫線的數(shù)組
SetIndexBuffer(1,bColorBuffer,INDICATOR_COLOR_INDEX);//INDICATOR_COLOR_INDEX表示是用于變色的顏色數(shù)組
注意：
如果這里要畫多條彩色線，則畫線數(shù)組和顏色數(shù)組的序號(hào)要緊鄰。
============================================
下一步就是在OnCaculate事件里進(jìn)行畫線數(shù)組的計(jì)算，同時(shí)根據(jù)自定義的條件對(duì)顏色數(shù)組進(jìn)行賦值。
賦值規(guī)則是：
當(dāng)對(duì)應(yīng)K線序號(hào)的顏色數(shù)組被賦值1.0時(shí)，對(duì)應(yīng)畫線數(shù)組的顏色為 第一個(gè)顏色
當(dāng)對(duì)應(yīng)K線序號(hào)的顏色數(shù)組被賦值0.0時(shí)，對(duì)應(yīng)畫線數(shù)組的顏色為 第二個(gè)顏色
完。
程序舉例源碼如下：【畫出兩個(gè)變色線】
復(fù)制代碼- //+------------------------------------------------------------------+
- //| Test.mq5 |
- //| Copyright 2009, MetaQuotes Software Corp. |
- //| http://bbs.520fx.com |
- //+------------------------------------------------------------------+
- #property copyright "2009, 520FX"
- #property link "http://www.mql5.com"
- #property version "1.00"
- #property indicator_chart_window
- #property indicator_buffers 4
- #property indicator_plots 2
- #property indicator_color1 Red,Green
- #property indicator_type1 DRAW_COLOR_LINE
- #property indicator_style1 STYLE_SOLID
- #property indicator_width1 2
- #property indicator_color2 Yellow,Blue
- #property indicator_type2 DRAW_COLOR_LINE
- #property indicator_style2 STYLE_SOLID
- #property indicator_width2 2
- input int MaPeriod=13;
- double bMaBuffer[],bMaBuffer1[],bColorBuffer[],bColorBuffer1[];
- int iMaHandle,iMaHandle1;
- //+------------------------------------------------------------------+
- //| Custom indicator initialization function |
- //+------------------------------------------------------------------+
- int OnInit()
- {
- //--- indicator buffers mapping
- SetIndexBuffer(0,bMaBuffer,INDICATOR_DATA);
- SetIndexBuffer(1,bColorBuffer,INDICATOR_COLOR_INDEX);
- SetIndexBuffer(2,bMaBuffer1,INDICATOR_DATA);
- SetIndexBuffer(3,bColorBuffer1,INDICATOR_COLOR_INDEX);
- IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
- iMaHandle=iMA(NULL,0,MaPeriod,0,MODE_SMA,PRICE_CLOSE);
- iMaHandle1=iMA(NULL,0,MaPeriod+50,0,MODE_SMA,PRICE_CLOSE);
- //---
- return(0);
- }
- //+------------------------------------------------------------------+
- //| 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[])
- {
- //--- return value of prev_calculated for next call
- //--- checking for bars count
- if(rates_total<MaPeriod)
- return(0);
- //--- detect start position
- int start;
- //if(prev_calculated>1) start=prev_calculated-1;
- //else start=1;
- if(prev_calculated<0)return(-1);else start=rates_total-prev_calculated+1;
- int to_copy;
- if(prev_calculated>rates_total || prev_calculated<0) to_copy=rates_total;
- else
- {
- to_copy=rates_total-prev_calculated;
- if(prev_calculated>0) to_copy++;
- }
- if(CopyBuffer(iMaHandle,0,0,to_copy,bMaBuffer)<=0)
- {
- Print("Getting fast SMA is failed! Error",GetLastError());
- return(0);
- }
- if(CopyBuffer(iMaHandle1,0,0,to_copy,bMaBuffer1)<=0)
- {
- Print("Getting fast SMA1 is failed! Error",GetLastError());
- return(0);
- }
- //--- main cycle
- for(int i=start;i<rates_total;i++)
- {
- if(bMaBuffer[i]>close[i-1])
- bColorBuffer[i]=1.0;
- else bColorBuffer[i]=0.0;
- if(bMaBuffer1[i]>close[i-1])
- bColorBuffer1[i]=1.0;
- else bColorBuffer1[i]=0.0;
- }
- return(rates_total);
- }
- //+------------------------------------------------------------------+
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