mql4里很多自定义指标,将自定义指标拖入途中就能看到曲线图,俗话说,有图有真像,图是如何画的呢?我一直比较好奇,比如iMACD技术参数的图如下:
这个图是如何画的呢?
问题1,银色的线垂直的线如何画,红色的曲线如何画
问题2, 两条线的数据是如何获取的 ?
带着这2个问题,我们看下这个源码
还好Mql开放了这个源代码,我们可以研究下, 源码如下
- //+------------------------------------------------------------------+
- //| Custom MACD.mq4 |
- //| Copyright ?2004, MetaQuotes Software Corp. |
- //| http://www.metaquotes.net/ |
- //+------------------------------------------------------------------+
- #property copyright "Copyright ?2004, MetaQuotes Software Corp."
- #property link "http://www.metaquotes.net/"
- //---- indicator settings
- #property indicator_separate_window
- #property indicator_buffers 2
- #property indicator_color1 Silver
- #property indicator_color2 Red
- #property indicator_width1 2
- //---- indicator parameters
- extern int FastEMA=12;
- extern int SlowEMA=26;
- extern int SignalSMA=9;
- //---- indicator buffers
- double MacdBuffer[];
- double SignalBuffer[];
- //+------------------------------------------------------------------+
- //| Custom indicator initialization function |
- //+------------------------------------------------------------------+
- int init()
- {
- //---- drawing settings
- SetIndexStyle(0,DRAW_HISTOGRAM);
- SetIndexStyle(1,DRAW_LINE);
- SetIndexDrawBegin(1,SignalSMA);
- IndicatorDigits(Digits+1);
- //---- indicator buffers mapping
- SetIndexBuffer(0,MacdBuffer);
- SetIndexBuffer(1,SignalBuffer);
- //---- name for DataWindow and indicator subwindow label
- IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+")");
- SetIndexLabel(0,"MACD");
- SetIndexLabel(1,"Signal");
- //---- initialization done
- return(0);
- }
- //+------------------------------------------------------------------+
- //| Moving Averages Convergence/Divergence |
- //+------------------------------------------------------------------+
- int start()
- {
- int limit;
- int counted_bars=IndicatorCounted();
- //---- last counted bar will be recounted
- if(counted_bars>0) counted_bars--;
- limit=Bars-counted_bars;
- //---- macd counted in the 1-st buffer
- for(int i=0; i<limit; i++)
- MacdBuffer[i]=iMA(NULL,0,FastEMA,0,MODE_EMA,PRICE_CLOSE,i)-iMA(NULL,0,SlowEMA,0,MODE_EMA,PRICE_CLOSE,i);
- //---- signal line counted in the 2-nd buffer
- for(i=0; i<limit; i++)
- SignalBuffer[i]=iMAOnArray(MacdBuffer,Bars,SignalSMA,0,MODE_SMA,i);
- //---- done
- return(0);
- }
- //+------------------------------------------------------------------+
- #property indicator_buffers 2定义了有2条线
- #property indicator_color1 Silver#property indicator_color2 Red
- 定义颜色 ,银色和红色 #property indicator_width1 2定义线的宽度。 extern int FastEMA=12;
- extern int SlowEMA=26;
- extern int SignalSMA=9;iMACD的参数,我也不太明白,但是这对理解图的画法不影响,先不去管它。
- //---- indicator buffers
- double MacdBuffer[];
- double SignalBuffer[];这里是重点,存放数据的数组。
- int init()
- {
- //---- drawing settings SetIndexStyle(0,DRAW_HISTOGRAM);//设置第一条线的显示方式,这里就是垂直
- SetIndexStyle(1,DRAW_LINE);//水平线显示
- SetIndexDrawBegin(1,SignalSMA); //设置开始画的位置
- IndicatorDigits(Digits+1);
- //---- indicator buffers mapping
- SetIndexBuffer(0,MacdBuffer);
- SetIndexBuffer(1,SignalBuffer);
- //---- name for DataWindow and indicator subwindow label
- IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+")");
- SetIndexLabel(0,"MACD");
- SetIndexLabel(1,"Signal");
- //---- initialization done
- return(0);
- } 具体我就不一一解释了,后面有英文的注释,应该比较容易明白 ,因为系统没有ima的指标图,通过修改这个代码,我们可以画出iMA的指标图
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- //+------------------------------------------------------------------+
- //| Custom MACD.mq4 |
- //| Copyright ?2004, MetaQuotes Software Corp. |
- //| http://www.metaquotes.net/ |
- //+------------------------------------------------------------------+
- #property copyright "Copyright ?2004, MetaQuotes Software Corp."
- #property link "http://www.metaquotes.net/"
- //---- indicator settings
- #property indicator_separate_window
- #property indicator_color1 Red
- #property indicator_width1 2
- extern int SlowEMA=26;
- extern int ma_shift=0;
- double MacdBuffer[];
- double SignalBuffer[];
- //+------------------------------------------------------------------+
- //| Custom indicator initialization function |
- //+------------------------------------------------------------------+
- int init()
- {
- SetIndexStyle(0,DRAW_HISTOGRAM);
- IndicatorDigits(Digits+1);
- SetIndexBuffer(0,MacdBuffer);
- SetIndexLabel(0,"iMA");
- return(0);
- }
- //+------------------------------------------------------------------+
- //| Moving Averages Convergence/Divergence |
- //+------------------------------------------------------------------+
- int start()
- {
- int limit;
- int counted_bars=IndicatorCounted();
- //---- last counted bar will be recounted
- if(counted_bars>0) counted_bars--;
- limit=Bars-counted_bars;
- //---- macd counted in the 1-st buffer
- for(int i=0; i<limit; i++)
- MacdBuffer[i]=iMA(NULL,0,SlowEMA,ma_shift,MODE_EMA,PRICE_CLOSE,i);
- //---- done
- return(0);
- }
- //+------------------------------------------------------------------+ 创建这个脚本的时候请选择Custom indicator 模板来创建,编译后,就可以运行这个脚本了。
- 希望这篇文章能够对学习mql的朋友有所帮助.
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