Discussion of article "Graphics in DoEasy library (Part 89): Programming standard graphical objects. Basic functionality"

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New article Graphics in DoEasy library (Part 89): Programming standard graphical objects. Basic functionality has been published:

Currently, the library is able to track standard graphical objects on the client terminal chart, including their removal and modification of some of their parameters. At the moment, it lacks the ability to create standard graphical objects from custom programs.

Compile the EA and launch it on the chart.

First, create a vertical line by clicking on a chart while holding down Ctrl, have a look at the line ID and at how object properties change when moving the line along the chart. If we re-create the same line, we get the error message in the journal.
Next, create an equidistant channel, see its ID value and check how changes in the properties of its three pivot points are tracked:

Author: Artyom Trishkin

[andrik377]

1. Compiler issues a warning about using deprecated behaviour in
.

GraphElementsCollection.mqh line 2290 col 10.

It's been dragging for a long time, why don't you fix it?

2. Does this project have logging?
If yes, where is it described?

[Artyom Trishkin]

andrik377 project have logging?
If yes, where is it described?

1. The Print that causes this warning is temporary. That's why it is written as Print. Those that are needed in the library are written as ::Print. This one will be removed soon. PS: for me this is one way to know where the temporary stoppers are located - so I don't have to look for them for a long time.
2. What do you mean by "logging" ?

[andrik377]

1. I am a beginner here. What is ::Print? Where to read about it?

2. "logging" is journaling, i.e. generating information about events and sending them somewhere (to the Expert Advisor's log, file ...). It is a necessary thing for complex software. I have seen some rudiments of it in the texts of basic objects.

[Konstantin Nikitin]

andrik377 :Print? Where can I read about it?

2. "logging" is journaling, i.e. generating information about events and sending them somewhere (to the Expert Advisor's log, file ...). It is a necessary thing for complex software. I have seen some rudiments of it in the texts of basic objects.

Documentation -> Print

[Artyom Trishkin]

andrik377 :Print? Where can I read about it?

2. "logging" is journaling, i.e. generating information about events and sending them somewhere (to the Expert Advisor's log, file ...). It is a necessary thing for complex software. I have seen some rudiments of it in the texts of basic objects.

There is a class CMessage for this purpose.

:: before the function name is an operation of context resolution.

[andrik377]

The global ::Print method is not yet available?

[Artyom Trishkin]

andrik377 Print is not available yet?

Why do you need it?

There is a function. If you need it, use it.

[andrik377]

Still, how to override it, i.e. to make ::Print call not Print, but the override?
Please, an example.