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How to Write an Expert Advisor or an Indicator

MQL5 Source Code Library for MetaTrader 5 - 147

This is the largest free source code library for MetaTrader 5 platform programs. Here you can find ready-made Expert Advisors, technical indicators, scripts and libraries. Use the code library when learning MQL5 language and develop your own automated trading applications based on the provided codes.

You can freely download and test published codes, as well as launch them in MetaTrader 5. The library is also available directly from MetaTrader 5 platform and MetaEditor development environment.

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The cIntBMP library provides the creation of graphic BMP images. We will consider the example of its use in creation of self-similar fractal sets using the Iterated Function System (IFS).

The DRAW_ARROW drawing style plots the arrows (chars).

The DRAW_ZIGZAG drawing style allow to draw sections using the values of two indicator buffers. It looks like DRAW_SECTION, but it allows to draw vertical sections inside one bar.

The DRAW_BARS drawing style is used to plot the bars using the values of 4 indicator buffers with Open, High, Low and Close prices.

The DRAW_FILLING drawing style plots the filled area between the values of two indicator buffers. In fact, it plots two lines and fills the area between them with the specified color.

The DRAW_CANDLES drawing style plots the candles using the values of 4 indicator buffers with Open, High, Low and Close prices.

The DRAW_HISTOGRAM2 drawing style is used for plotting the values of two indicator's buffers as a histogram.

The DRAW_HISTOGRAM drawing style is used for plotting the values of the indicator's buffer as a histogram.

The DRAW_SECTION drawing style is used for plotting the values of the indicator's buffer as a sections.

The DRAW_LINE style is used for plotting the values of the indicator's buffer as a line.

The DRAW_NONE drawing style is used in cases, when you need to calculate and show the values of the indicator in "Data Window", but the plotting isn't needed.

The Roulette Game.

When the chart symbol is changed, it will change symbols for all other charts.

Trade signals based on "Morning Star/Evening Star" candlestick patterns, confirmed by Relative Strength Index (RSI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Morning Star/Evening Star" candlestick patterns, confirmed by Market Facilitation Index (MFI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Morning Star/Evening Star" candlestick patterns, confirmed by Commodity Channel Index (CCI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

If you need to show just a part of the image at the moment and hide other, you can use the moving window by specifying the visible area of the image.

Trade signals based on "Morning Star/Evening Star" candlestick pattern, confirmed by Stochastic indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish/Bearish Meeting Lines" candlestick pattern, confirmed by RSI (Relative Strength Index) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish/Bearish Meeting Lines" candlestick pattern, confirmed by Market Facilitation Index (MFI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish/Bearish Meeting Lines" candlestick pattern, confirmed by Commodity Channel Index (CCI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish/Bearish Meeting Lines" candlestick pattern, confirmed by Stochastic indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Hammer/Hanging Man" candlestick pattern, confirmed by Relative Strength Index (RSI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Hammer/Hanging Man" candlestick pattern, confirmed by Market Facilitation Index (MFI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Hammer/Hanging Man" candlestick pattern, confirmed by Commodity Channel Index (CCI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Hammer/Hanging Man" candlestick pattern, confirmed by Stochastic indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Harami/Bearish Harami" candlestick pattern, confirmed by Relative Strength Index (RSI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Harami/Bearish Harami" candlestick pattern, confirmed by Market Facilitation Index (MFI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Harami/Bearish Harami" candlestick pattern, confirmed by Commodity Channel Index (CCI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Harami/Bearish Harami" candlestick pattern, confirmed by Stochastic indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Engulfing/Bearish Engulfing" candlestick pattern, confirmed by Relative Strength Index (RSI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Engulfing/Bearish Engulfing" candlestick pattern, confirmed by Market Facilitation Index (MFI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Engulfing/Bearish Engulfing" candlestick pattern, confirmed by Commodity Channel Index (CCI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Bullish Engulfing/Bearish Engulfing" candlestick pattern, confirmed by Stochastic indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

The CDownLoadHistory class provides the methods of historical data downloading.

The script contains a class, that can be used to solve mathematical and logical expressions, defined as string.

The script downloads historical data (for the current symbol), available at trade server.

Trade signals based on "Dark Cloud Cover/Piercing Line" candlestick pattern, confirmed by Relative Strength Index (RSI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Dark Cloud Cover/Piercing Line" candlestick pattern, confirmed by Market Facilitation Index (MFI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

Trade signals based on "Dark Cloud Cover/Piercing Line" candlestick pattern, confirmed by Commodity Channel Index (CCI) indicator is considered. The code of the Expert Advisor based on this strategy can be generated automatically using the MQL5 Wizard.

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