PC SOFT

ONLINE HELP
FOR WINDEV, WEBDEV AND WINDEV MOBILE

Home | Sign in | English US
  • Coordinates
  • Drawing in an Image control with opacity
  • Drawing in PHP
  • Drawing in Browser code
WINDEV
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WEBDEV
WindowsLinuxPHPWEBDEV - Browser code
WINDEV Mobile
AndroidAndroid Widget iPhone/iPadApple WatchUniversal Windows 10 AppWindows Mobile
Others
Stored procedures
Identifies the opacity of a pixel in an image that supports the Alpha layer. This image can be:
  • an Image control,
  • Versions 17 and later
    WINDEVWEBDEV - Server codeWINDEV MobileReports and QueriesWindowsLinuxiPhone/iPadUser code (UMC) in an Image variable.
    New in version 17
    WINDEVWEBDEV - Server codeWINDEV MobileReports and QueriesWindowsLinuxiPhone/iPadUser code (UMC) in an Image variable.
    WINDEVWEBDEV - Server codeWINDEV MobileReports and QueriesWindowsLinuxiPhone/iPadUser code (UMC) in an Image variable.
    in an Image variable.
    WEBDEV - Browser codePHP This type of variable is not available.
Versions 15 and later
WINDEVJava This function is now available for the Java applications.
New in version 15
WINDEVJava This function is now available for the Java applications.
WINDEVJava This function is now available for the Java applications.
Versions 16 and later
Android This function is now available for the Android applications.
WEBDEV - Browser code This function is now available in Browser code.
WINDEVLinux This function is now available for the WINDEV applications in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
New in version 16
Android This function is now available for the Android applications.
WEBDEV - Browser code This function is now available in Browser code.
WINDEVLinux This function is now available for the WINDEV applications in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Android This function is now available for the Android applications.
WEBDEV - Browser code This function is now available in Browser code.
WINDEVLinux This function is now available for the WINDEV applications in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Versions 17 and later
iPhone/iPad This function is now available for the iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for the iPhone/iPad applications.
iPhone/iPad This function is now available for the iPhone/iPad applications.
Example
// Identify the opacity of the pixel (15, 25)
// on the "IMG_ImageDrawing" control
ResOpacity = dPixelOpacity(IMG_ImageDrawing, 15, 25)
Syntax
<Result> = dPixelOpacity([<Image Name>,] <X Coordinate> , <Y Coordinate>)
<Result>: Integer
Opacity of specified pixel (included between 0 for transparent and 255 for opaque).
<Image Name>: Optional character string (with or without quotes) or optional Image variable
Image to use. This image can correspond:
  • the name of an Image control.
  • Versions 17 and later
    WINDEVWEBDEV - Server codeWINDEV MobileReports and QueriesWindowsLinuxiPhone/iPadUser code (UMC) the name of an Image variable.
    New in version 17
    WINDEVWEBDEV - Server codeWINDEV MobileReports and QueriesWindowsLinuxiPhone/iPadUser code (UMC) the name of an Image variable.
    WINDEVWEBDEV - Server codeWINDEV MobileReports and QueriesWindowsLinuxiPhone/iPadUser code (UMC) the name of an Image variable.
    the name of an Image variable.
    WEBDEV - Browser codePHP This type of variable is not available.
If this parameter is not specified, the image handled by dStartDrawing will be used.
<X Coordinate>: Integer
Horizontal position of pixel to use.
<Y Coordinate>: Integer
Vertical position of pixel to use.
Remarks

Coordinates

The coordinates are specified in pixels in relation to the top left corner of Image control (coordinates set to (0, 0)).
To retrieve the position of a mouse click in an Image control, use MouseXPos and MouseYPos.

Drawing in an Image control with opacity

dStartDrawing must be called before using the drawing functions. dStartDrawing is used to define the image (Image control or Image variable) onto which the drawing functions will be applied. The dWithOpacity constant is used to specify that the opacity will be managed by the drawing (Alpha layer).
The drawing functions operate on a copy ("bitmap") of the image. You can use the drawing functions of Windows (via API or CallDLL32) but these Windows functions must use the DC (Device Context) returned by dStartDrawing.
For an Image control, dEndDrawing and dStartDrawing must not be called in the same process. The drawing will not be displayed if dEndDrawing and dStartDrawing are called in the same process: it will be automatically erased.
PHP

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
WEBDEV - Browser code

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 the 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
WEBDEV - Browser code

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 the 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.
WEBDEV - Browser code

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 the 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.
Components
WINDEVReports and Queries wd230obj.dll
WEBDEV - Server code wd230page.dll
WEBDEV - Browser code WDJS.DLL
Java wd230java.jar
Linux wd230obj.so
Android wd230android.jar
Minimum required version
  • Version 12
This page is also available for…
Comments
Click [Add] to post a comment