dRotation (Function)

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dRotation (Function)

In french: dRotation

Performs a rotation:

in an Image control,
in a variable of type Image.
This type of variable is not available.
in a variable of type picLayer.

Caution: In Linux, this function requires a specific configuration. For more details, see Drawing in WINDEV, WEBDEV and WINDEV Mobile.

Example

// Rotation du champ IMG_Image1 de 45 degrés
Résultat1 is boolean
Résultat1 = dRotation(IMG_Image1, 45)
IF Résultat1 = False THEN Error("L'opération a échoué")

Syntax

Performing a simple rotation Hide the details

<Result> = dRotation(<Image> , <Rotation angle> [, <Options>])

<Result>: Boolean

True if the rotation has been completed,
False otherwise.

<Image>: Control name, Image variable 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.
the name of a variable of type picLayer.
The rotation is performed in relation to the center of the image. The image is directly modified.

<Rotation angle>: Real

Rotation angle (in degrees).
If the angle is positive, the image rotates clockwise.
If the angle is negative, the image rotates counterclockwise.

<Options>: Integer constant

Rotation options:
drAdapt The image is flipped and enlarged. Then, its size is reduced to correspond to the initial image size.
drDefault Enlarge the image (if necessary) so that it corresponds to the dimensions of rotated image.
Constant used by default for Image or picLayer variables.
drNoEnlarging The image is rotated but not enlarged: the image may be truncated.
Constant used by default for the Image controls.

This parameter is not available.

Performing a rotation while modifying the center of rotation Hide the details

<Result> = dRotation(<Image control> , <Rotation angle> , <X of rotation center> , <Y of rotation center> [, <Options>])

<Result>: Boolean

True if the rotation has been completed,
False otherwise.

<Image control>: Control name

Name of the Image control to be used. The rotation is performed in relation to the center of the Image control. The image found in the Image control is modified.

<Rotation angle>: Real

Rotation angle (in degrees).

<X of rotation center>: Integer

X-coordinate (in pixels) of the new rotation center.

<Y of rotation center>: Integer

Y-coordinate (in pixels) of the new rotation center.

<Options>: Integer constant

Rotation options:
drDefault Enlarge the image (if necessary) so that it corresponds to the dimensions of rotated image.
Constant used by default for Image or picLayer variables.
drNoEnlarging The image is flipped but not enlarged
Constant used by default for the Image controls.

Remarks

End of drawing

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

Drawing in 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.

Please note To use the drawing functions with Internet Explorer 9, the project must include a 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 display the project description window, under the "Project" pane, in the "Project" group, click on "Description".

Special case: Drawing in the browser of an Android phone Browser drawing functions are only available in Android version 3 and higher.

Related Examples:

Unit examples (WINDEV): Image rotation

[ + ] Image rotation from any point that will be used as rotation center.

Business / UI classification: Neutral code

Component: wd300pnt.dll