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  • Coordinates
  • Drawing in an image with opacity
  • Pattern and PHP
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Stored procedures
Identifies the opacity of a pixel in an image (in an Image control) that manages the Alpha layer.
Versions 15 and later
Java This function is now available for Java applications.
New in version 15
Java This function is now available for Java applications.
Java This function is now available for Java applications.
Example
// Identify the opacity of the pixel (15, 25)
// on the "IMG_ImageDrawing" control
ResOpacity = IMG_ImageDrawing.PixelOpacity(15, 25)
Syntax
<Result> = <Image control>.PixelOpacity(<X coordinate> , <Y coordinate>)
<Result>: Integer
Opacity of specified pixel (included between 0 for transparent and 255 for opaque).
<Image control>: Control name
Name of the Image control to use.
<X coordinate>: Integer
Horizontal position of pixel to use.
<Y coordinate>: Integer
Vertical position of pixel to use.
Remarks

Coordinates

Coordinates are given in pixels with respect to the top left corner of the image (coordinates: (0.0)).
To retrieve the position of a mouse click in an Image control, use MouseXPos and MouseYPos.

Drawing in an image with opacity

To specify that the drawing in the image supports opacity (Alpha layer), use <Image>.StartDrawing and the dWithOpacity constant.
PHP

Pattern and 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.
Component: wd260obj.dll
Minimum version required
  • Version 24
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