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  • Coordinates
  • Using the drawing functions
  • Drawing in an image 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 25 and later
    WINDEVWEBDEV - Server code in a WDPic variable (on the background layer),
    New in version 25
    WINDEVWEBDEV - Server code in a WDPic variable (on the background layer),
    WINDEVWEBDEV - Server code in a WDPic variable (on the background layer),
  • Versions 25 and later
    WINDEVWEBDEV - Server code in a picLayer variable.
    New in version 25
    WINDEVWEBDEV - Server code in a picLayer variable.
    WINDEVWEBDEV - Server code in a picLayer variable.
Versions 15 and later
WINDEVJava This function is now available for Java applications.
New in version 15
WINDEVJava This function is now available for Java applications.
WINDEVJava This function is now available for Java applications.
Versions 16 and later
Android This function is now available for Android applications.
WEBDEV - Browser code This function is now available in Browser code.
WINDEVLinux This function is now available for 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 Android applications.
WEBDEV - Browser code This function is now available in Browser code.
WINDEVLinux This function is now available for 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 Android applications.
WEBDEV - Browser code This function is now available in Browser code.
WINDEVLinux This function is now available for 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 iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for 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>, ] <X coordinate> , <Y coordinate>)
<Result>: Integer
Opacity of specified pixel (included between 0 for transparent and 255 for opaque).
<Image>: Optional control name or optional Image, WDPic or picLayer variable
Image to use. This image can correspond to:
  • 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.
  • Versions 25 and later
    WINDEVWEBDEV - Server code the name of a WDPic variable. Only the background layer will be handled.
    New in version 25
    WINDEVWEBDEV - Server code the name of a WDPic variable. Only the background layer will be handled.
    WINDEVWEBDEV - Server code the name of a WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WINDEVWEBDEV - Server code the name of a picLayer variable.
    New in version 25
    WINDEVWEBDEV - Server code the name of a picLayer variable.
    WINDEVWEBDEV - Server code the name of a picLayer variable.
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

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.

Using the drawing functions

The drawing functions can be used according to 2 methods:
  • Method 1: Using dStartDrawing
    • dStartDrawing must be called before any other drawing function. dStartDrawing is used to define the element (Image control or variable) to which the drawing functions will be applied.
    • When drawing on an Image control:
      • 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 functions must use the DC (Device Context) returned by dStartDrawing.
      • 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.
  • Versions 24 and later
    Reports and QueriesWindowsLinuxAndroidiPhone/iPadJavaUser code (UMC) Method 2: indicating the drawing target directly in the syntax (via a parameter)
    The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
    Versions 25 and later
    AndroidJava This syntax is now available.
    New in version 25
    AndroidJava This syntax is now available.
    AndroidJava This syntax is now available.
    New in version 24
    Reports and QueriesWindowsLinuxAndroidiPhone/iPadJavaUser code (UMC) Method 2: indicating the drawing target directly in the syntax (via a parameter)
    The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
    Versions 25 and later
    AndroidJava This syntax is now available.
    New in version 25
    AndroidJava This syntax is now available.
    AndroidJava This syntax is now available.
    Reports and QueriesWindowsLinuxAndroidiPhone/iPadJavaUser code (UMC) Method 2: indicating the drawing target directly in the syntax (via a parameter)
    The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
    Versions 25 and later
    AndroidJava This syntax is now available.
    New in version 25
    AndroidJava This syntax is now available.
    AndroidJava This syntax is now available.

Drawing in an image with opacity

To specify that the drawing in the image manages opacity (Alpha layer), use dStartDrawing and the dWithOpacity constant.
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 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 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 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.
Component : wd250obj.dll
Minimum version required
  • Version 12
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