dHorizontalSymmetry (Function)

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dHorizontalSymmetry (Function)

In french: dSymétrieHorizontale

Flips an image with respect to a horizontal axis (symmetry with respect to a horizontal axis). The image can correspond to:

an Image control,
a variable of type Image.
This type of variable is not available.
a variable of type WDPic (on the background layer),
a variable of type picLayer.

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

Example

// Symmetry of IMG_IMAGE1 with respect to a horizontal axis
MyResult is boolean
MyResult = dHorizontalSymmetry(IMG_IMAGE1)
IF MyResult = False THEN Error("The operation failed")

Syntax

<Result> = dHorizontalSymmetry(<Image>)

<Result>: Boolean

True if the symmetry was performed,
False otherwise.

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

Image to use. The 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.
the name of a variable of type WDPic. Only the background layer will be handled.
the name of a variable of type picLayer.
The symmetry is performed in relation to the media horizontal axis of the control or image. The image is directly modified.

Remarks

End of drawing

If dEndDrawing and dHorizontalSymmetry are called in the same process, the image changes will not be displayed.

Pattern and PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting providers 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.

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 project description window.
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.

Component: wd300pnt.dll