dResize (Function)

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Drawing in PHP
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dResize (Function)

In french: dRedimensionne

Resizes an image found:

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

// Zoom du champ IMG_Image1: on grossit 2 fois l'image affichée dans le champ
Résultat1 is boolean
Résultat1 = dResize(IMG_Image1, IMG_Image1.Largeur * 2, IMG_Image1.Hauteur * 2)
IF Résultat1 = False THEN Error("L'opération a échoué")

Syntax

<Result> = dResize(<Image> , <New width> , <New height> [, <Option>])

<Result>: Boolean

True if resized successfully,
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.

<New width>: Integer

New image width expressed in pixels.

<New height>: Integer

New height of the image expressed in pixels.

<Option>: Optional Integer constant

Resizing options:
drHighQuality This constant can be combined with the homothetic resizing options.
In homothetic mode, this constant is used to improve the quality of the image when it is reduced in relation to its initial size.
This constant is not available.
drHomothetic The image is stretched or reduced to occupy the defined space in an optimal way without being distorted. It occupies:
the entire specified height.
the entire specified width.
This constant is not available.
drHomotheticCentered The image is stretched or reduced to occupy the defined space in an optimal way without being distorted and it is centered. It occupies:
or the entire specified height: the image is centered horizontally.
or the entire specified width: the image is centered vertically.
This constant is not available.
drHomotheticExtended The image is stretched or reduced in order for the smallest side of the image to be entirely displayed.
This constant is not available.
drStretched
(Default value) The image is stretched if necessary to fit the new specified width and height.
This constant is not available.
drTiled The image is tiled to occupy the entire new specified width and the entire new specified height.
This constant is not available.
This parameter is not available.

Remarks

End of drawing

If dEndDrawing and dResize 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