<Image>.ModifyHue (Function)

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Drawing functions on Image controls

ModifyHue

Presentation

Example

Drawing in PHP

Drawing in Browser code

See also

<Image>.ModifyHue (Function)

In french: <Image>.ModifieTeinte

Not available

Changes the hue of an image in an Image control.

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

Example

// Changes the hue of the image found in the IMG_Image1 control
IMG_Image1.ModifyHue(50)

Syntax

<Result> = <Image control>.ModifyHue(<Variation of hue> [, <Destination image>])

<Result>: Boolean

True if the change was performed,
False otherwise.

<Image control>: Control name

Name of the Image control to be used.

<Variation of hue>: Integer

Value included between -360 and +360. This value will be added to the current hue of each pixel to get a new hue.

<Destination image>: Name of the Image control or variable

Image where the transformed image will be drawn. 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.
If this parameter is not specified, the transformation will be performed in <Image control>

Remarks

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.

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.

Component: wd270pnt.dll