dVerticalSymmetry (Function)

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dVerticalSymmetry (Function)

In french: dSymétrieVerticale

Flips an image with respect to a vertical axis (symmetry with respect to a vertical axis). This image can correspond to:

an Image control,
a variable of type Image.
This type of variable is not available.
Versions 25 and later
a WDPic variable (on the background layer).
New in version 25
a WDPic variable (on the background layer).
a WDPic variable (on the background layer).
Versions 25 and later
a variable of type picLayer.
New in version 25
a variable of type picLayer.
a variable of type picLayer.

Versions 16 and later

This function is now available for Android applications.

This function is now available in Browser code.

New in version 16

This function is now available for Android applications.

This function is now available in Browser code.

This function is now available for Android applications.

This function is now available in Browser code.

Versions 17 and later

This function is now available for WINDEV applications in Linux.

This function is now available for WEBDEV sites in Linux.

This function is now available for iPhone/iPad applications.

Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.

New in version 17

This function is now available for WINDEV applications in Linux.

This function is now available for WEBDEV sites in Linux.

This function is now available for iPhone/iPad applications.

Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.

This function is now available for WINDEV applications in Linux.

This function is now available for WEBDEV sites in Linux.

This function is now available for iPhone/iPad applications.

Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

// Vertical symmetry of the IMG_Image1 control
MyResult is boolean
MyResult = dVerticalSymmetry(IMG_Image1)
IF MyResult = False THEN Error("The operation failed")

Syntax

<Result> = dVerticalSymmetry(<Image>)

<Result>: Boolean

True if the symmetry was performed,
False otherwise.

<Image>: Name of Image control, Image, WDPic or picLayer variable

Image to use. This image can correspond to:
the name of an Image control.
the name of a variable of type Image.
This type of variable is not available.
Versions 25 and later
the name of a variable of type WDPic. Only the background layer will be handled.
New in version 25
the name of a variable of type WDPic. Only the background layer will be handled.
the name of a variable of type WDPic. Only the background layer will be handled.
Versions 25 and later
the name of a variable of type picLayer.
New in version 25
the name of a variable of type picLayer.
the name of a variable of type picLayer.
The symmetry is performed in relation to the median vertical axis of the control or of the image. The image is directly modified.

Remarks

End of drawing

The transformation of the image will not be displayed if dEndDrawing and dVerticalSymmetry are called in the same process.

Pattern and PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting companies and therefore it is always enabled. The version of the GD library must be version 2.0.28 (or later). This library can be downloaded from the PHP site.

To enable (if necessary) this library locally, the following elements are required:

PHP installed.
the PHP.INI file found in the Windows directory must contain the following line: "extension=php_gd2.dll" (instead of ";extension=php_gd2.dll").
the php_gd2.dll file must exist in the directory of PHP extensions. This directory is defined in the PHP.INI file by the "extension_dir" variable.

Versions 16 and later

Drawing in Browser code

Some drawing functions are available in Browser code. The drawing functions in Browser code are based on the HTML 5 standard. More specifically, these functions are based on the "canvas" tag of HTML 5.

The drawing features in browser code are available for the recent browsers only (supporting the HTML 5 standard). To find out whether the drawing features are proposed by your browser, use DrawingAvailable.

Caution: To use the drawing functions with Internet Explorer 9, the project must include the reference to the DTD file. To do so, the HTML mode must be "HTML 4.01 Transitional + DTD". This option is available in the "Advanced" tab of the description window of project.
Reminder: To open the project description window, go to the "Project" tab, "Project" group and click "Description".

Special case: Drawing in the browser of an Android phone: The browser drawing functions are only available starting with version 3 of Android.

New in version 16

Drawing in Browser code

Special case: Drawing in the browser of an Android phone: The browser drawing functions are only available starting with version 3 of Android.

Drawing in Browser code

Special case: Drawing in the browser of an Android phone: The browser drawing functions are only available starting with version 3 of Android.

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