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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的指标图复制代码
//+------------------------------------------------------------------+
//| 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.复制代码
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