![]() Changing the Indexing Directionįunction ArraySetAsSeries() allows changing the method of accessing elements of a dynamic array the physical order of data storing in the computer memory is not changed at that. If a timeseries contains data on a daily timeframe, data of the current yet uncompleted day are located on the zero position, and the position with index 1 contains yesterday data. So the timeseries element with index 0 contains the information about the latest quote of a symbol. Timeseries being used for storing history price data and contain the time information, we can say that the newest data are placed in the extreme right position of the timeseries, while the oldest data are in the extreme left position. the first element of a timeseries is in the extreme right position, and the last element is in the extreme left position. ![]() ![]() Timeseries are arrays with reverse indexing, i.e. Indicator buffers do not require setting of their size using function ArrayResize() - this will be done by the executing system of the terminal. A usual dynamic array of type double is assigned as an indicator buffer using the SetIndexBuffer() function. Thus, the very first element of an array or indicator buffer with index 0 is by default on the extreme left position, while the last element is on the extreme right position.Īn indicator buffer is a dynamic array of type double, whose size is managed by the client terminals, so that it always corresponds to the number of bars the indicator is calculated on. ![]() The index of the first element is always equal to zero. The default indexing of all arrays and indicator buffers is left to right. Thus, in MQL5, custom indicators can be superimposed on other indicators (for example, TEMA from MACD) allowing users to receive new combinations of indicators to quickly test ideas without programming.Indexing Direction in Arrays, Buffers and Timeseries For example, an indicator's color, style, line width, as well as an arrow's color and code can be changed on the fly if a certain condition occurs.Īlso, added the OnCalculate() handler allowing to calculate indicator values based on another indicator. Now you are able to set the indexing direction in the arrays on your own, which greatly simplifies the development of indicators.Īnother notable feature of MQL5 is the dynamic change of the drawing style using the PlotIndexSetXXX functions. Such an approach is very convenient for developing EAs, but it causes difficulties when working with indicator buffers in loops. In addition, timeseries indexing (calculation from present to past) is not necessary to calculate indicator values. In MQL5, this set has been significantly increased up to 512 indicator buffers and 18 drawing styles. MQL4 programmers have 8 buffers and 6 drawing styles to develop custom indicators. To better understand this, it is recommended that you study indicator styles in examples.Īll the necessary calculations of a custom indicator must be placed in the predetermined function OnCalculate(). Indicator properties can be set using the compiler directives or using functions. Sets a value for a given horizontal level of the indicator to be output in a separate window Sets a new style, width and color of horizontal levels of indicator to be output in a separate window Sets the new type, style, width and color for a given indicator line Sets drawing line description for showing in the DataWindow and in the tooltip Sets the bar number from which the drawing of the given indicator line must start Sets an arrow symbol for indicators line of the DRAW_ARROW type Sets the "short" name of a custom indicator to be shown in the DataWindow and in the chart subwindow Sets precision format to visualize indicator values Returns the amount of bars not changed after the indicator had been launched last Sets the value of an indicator property of the string typeīinds the specified indicator buffer with one-dimensional dynamic array of the double typeĪllocates memory for buffers used for custom indicator calculations Sets the value of an indicator property of the int type Sets the value of an indicator property of the double type The function sets a flag hiding indicators called by the Expert Advisor
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