dInvertColor (Function)

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End of drawing
Drawing in PHP
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dInvertColor (Function)

In french: dInverseCouleur

Reverses the colors:

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

// Inverse les couleurs du champ IMG_Image1
Résultat1 is boolean
Résultat1 = dInvertColor(IMG_Image1)
IF Résultat1 = False THEN Error("L'opération a échoué")

Syntax

<Result> = dInvertColor(<Image>)

<Result>: Boolean

True if color reversal has been performed,
False otherwise.

<Image>: Name of the 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.
the name of a variable of type WDPic. Only the background layer will be handled.
the name of a variable of type picLayer.
Each pixel found in the image takes the opposite color from its initial color (bit-to-bit reversal). The image used is directly modified.

Remarks

End of drawing

If dEndDrawing and dInvertColor 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.

Component: wd300pnt.dll