dRotation (Function)

Performs a rotation:

an Image control,
Versions 17 and later
in an Image variable.
New in version 17
in an Image variable.
in an Image variable. in an Image variable.
This type of variable is not available.
Versions 25 and later
in a picLayer variable.
New in version 25
in a picLayer variable.
in a picLayer variable.

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. See The drawings for more details.

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. See The drawings for more details.

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. See The drawings for more details.

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

// Turn the IMG_Image1 control round by 45 degrees
Result1 is boolean
Result1 = dRotation(IMG_Image1, 45)
IF Result1 = False THEN Error("The operation failed")

Syntax

Performing a simple rotation Hide the details

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

<Result>: Boolean

True if the rotation was performed,
False otherwise.

<Image>: Control name, Image variable or picLayer variable

Image to use. This image can correspond to:
the name of an Image control.
Versions 17 and later
the name of an Image variable.
New in version 17
the name of an Image variable.
the name of an Image variable. the name of an Image variable.
This type of variable is not available.
Versions 25 and later
the name of an picLayer variable.
New in version 25
the name of an picLayer variable.
the name of an picLayer variable.
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 anticlockwise.

<Options>: Integer constant

Versions 17 and later
Rotation options:
drAdapt The image is turned while it is 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 turned but it is not enlarged: the image may be truncated.
Constant used by default for the Image controls.

This parameter is not available.
New in version 17
Rotation options:
drAdapt The image is turned while it is 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 turned but it is not enlarged: the image may be truncated.
Constant used by default for the Image controls.

This parameter is not available.
Rotation options:
drAdapt The image is turned while it is 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 turned but it is 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 rotation center Hide the details

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

<Result>: Boolean

True if the rotation was performed,
False otherwise.

<Image control>: Control name

Name of Image control to use. 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 turned but it is not enlarged.
Constant used by default for the Image controls.

Versions 18 and later
This parameter is not available.
New in version 18
This parameter is not available.
This parameter is not available.

Remarks

End of drawing

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

Drawing in 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". This option is available in the "Advanced" tab of description window of project ("Project .. Project description"), "Advanced" button, "W3C standard" option.

Caution: To use the drawing functions with Internet Explorer 9, the project must "include the reference to the DTD file". This option is available in the "Advanced" tab of the description window of the project ("Project .. Project description").

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 display the description window of project, on the "Project" pane, in the "Project" group, 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

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". This option is available in the "Advanced" tab of description window of project ("Project .. Project description"), "Advanced" button, "W3C standard" option.

Caution: To use the drawing functions with Internet Explorer 9, the project must "include the reference to the DTD file". This option is available in the "Advanced" tab of the description window of the project ("Project .. Project description").

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 display the description window of project, on the "Project" pane, in the "Project" group, 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.

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". This option is available in the "Advanced" tab of description window of project ("Project .. Project description"), "Advanced" button, "W3C standard" option.

Caution: To use the drawing functions with Internet Explorer 9, the project must "include the reference to the DTD file". This option is available in the "Advanced" tab of the description window of the project ("Project .. Project description").

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 display the description window of project, on the "Project" pane, in the "Project" group, 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.

Related Examples:

Unit examples (WINDEV): Image rotation

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

Component : wd250pnt.dll