mql4如何自定义画图
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/ |
//+------------------------------------------------------------------+
#propertycopyright "Copyright ?2004, MetaQuotes Software Corp."
#propertylink "http://www.metaquotes.net/"
//---- indicator settings
#propertyindicator_separate_window
#propertyindicator_buffers 2
#propertyindicator_color1Silver
#propertyindicator_color2Red
#propertyindicator_width12
//---- 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=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=iMAOnArray(MacdBuffer,Bars,SignalSMA,0,MODE_SMA,i);
//---- done
return(0);
}
//+------------------------------------------------------------------+
#propertyindicator_buffers 2定义了有2条线
#propertyindicator_color1Silver#propertyindicator_color2Red
定义颜色 ，银色和红色 #propertyindicator_width12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
//+------------------------------------------------------------------+
//| Custom MACD.mq4 |
//| Copyright ?2004, MetaQuotes Software Corp. |
//| http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#propertycopyright "Copyright ?2004, MetaQuotes Software Corp."
#propertylink "http://www.metaquotes.net/"
//---- indicator settings
#propertyindicator_separate_window
#propertyindicator_color1Red
#propertyindicator_width12
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=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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