crect and ccanvas Replacement: Enhanced Standard Library with Bug Fixes
Info
The crect and ccanvas Replacement: Enhanced Standard Library with Bug Fixes is a Library for MetaTrader 5 that metaquotes software: bug fixes and enhancementswhen working with the standard library on a pixel basis, you may encounter missing pixels due to bugs in the crect class. The primary issue lies in the class's incorrect calculation of rectangle height and width, which affects most classes derived from cwnd, as cwnd relies on crect for graphical representation.
Usage
This tool is typically used for enhancing chart analysis and decision making.
Platform
This Library works exclusively on MetaTrader 5 (both build 600+ and newer versions).
Setup
Place the downloaded file in MQL5/Libraries folder via File ? Open Data Folder in MetaTrader 5.
How to Install and Use crect and ccanvas Replacement: Enhanced Standard Library with Bug Fixes
1. Storage: Place library files in the MQL/Libraries directory to ensure they are accessible to your projects.
2. Implementation: Include the library in your code using the #import directive, ensuring you match the exact function names and parameters.
3. Compilation: Ensure the library is present in the directory before you compile your main EA or script, as the compiler links them during this phase.
4. Management: Keep libraries organized in sub-folders if you manage many custom functions to maintain a clean project structure.
Frequently Asked Questions
Q: What is a library file used for? A: Libraries store reusable code modules, allowing you to centralize common logic used by multiple EAs or indicators.
Q: Is a library executable? A: No, libraries are non-executable files containing functions; they must be imported into an EA, indicator, or script to function.
Q: Can I update a library while the platform is running? A: You should compile your EA or script after updating a library to ensure the latest code changes are integrated.
What this tool does
MetaQuotes Software: Bug Fixes and EnhancementsWhen working with the standard library on a pixel basis, you may encounter missing pixels due to bugs in the crect class.
Typical Use Case
This Library excels in automated trading and technical analysis on MetaTrader 5.
Compatible Platform & Setup
This Library works on MetaTrader 5. Place the file in the MQL5/Libraries folder and restart the terminal.
Description & Settings
Related: Check History Function - another powerful library for MetaTrader 5 traders.
MetaQuotes Software: Bug Fixes and EnhancementsWhen working with the standard library on a pixel basis, you may encounter missing pixels due to bugs in the crect class. The primary issue lies in the class's incorrect calculation of rectangle height and width, which affects most classes derived from cwnd, as cwnd relies on crect for graphical representation.
Also recommended: mediator - behavioral design pattern - similar library with strong performance on MetaTrader 5.
The original crect calculates width as:
This calculation is incorrect. For a rectangle from 0,0 to 10,10, the width should be 11 pixels, not 10. The correct calculation is:
Inconsistencies are also present in other standard library classes, like ccanvas, where rectangle filling and memory resource addressing calculations differ.
This updated version introduces several improvements:
- Accurate width and height calculations for rectangles.
- Consistent behavior across standard library classes for rectangle operations.
- Support for comparison operators (==, !=, >=, <=, >, <) for rectangles, simplifying code.
- Unary operators (++, --, +) for rectangle expansion and inflation.
Installation and Recommendations:
- Replace rect.mqh with the provided file in the controls folder. Ensure it remains in the specified folder for proper functionality.
- Replace canvas.mqh with the attached file in the canvas folder. Maintain the original folder structure for compatibility.
- Backup this file and restore it with future MetaTrader releases to maintain the fixes.
- MetaQuotes may officially adopt these fixes in future updates, ensuring users are notified.
You may also like: error description library for metatrader 4/5 - excellent alternative for library users on MetaTrader 5.
Source Code
#include <files\filebin.mqh>
#include <controls\rect.mqh>
#define sign(i) ((i<0) ? -1 : 1)
#define xrgb(r,g,b) (0xff000000|(uchar(r)<<16)|(uchar(g)<<8)|uchar(b))
#define argb(a,r,g,b) ((uchar(a)<<24)|(uchar(r)<<16)|(uchar(g)<<8)|uchar(b))
#define trgb(a,rgb) ((uchar(a)<<24)|(rgb))
#define getrgb(clr) ((clr)&0xffffff)
#define getrgba(clr) uchar((clr)>>24)
#define getrgbr(clr) uchar((clr)>>16)
#define getrgbg(clr) uchar((clr)>>8).......
⚠ Limitations & Risk Warning
- This tool is provided for educational and testing purposes only.
- Past performance does not guarantee future results.
- Trading involves substantial risk of loss. Use on a demo account first.
- Results may vary depending on market conditions, broker, and settings.
- We recommend thorough backtesting and forward testing before using with real funds.