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);
}
//+------------------------------------------------------------------+
定义了有2条线
#property indicator_color2 Red
#property indicator_width1 2
定义线的宽度。
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。
double MacdBuffer[];
double SignalBuffer[];
这里是重点,存放数据的数组。
{
//---- 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);
}
//| 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.
MQL 虽然语法不难,但是那些技术指标好是难懂,希望有兴趣的朋友能够一起学习,探讨,共同进步!