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  • Coordinates
  • How to retrieve the components of the color?
  • Using the drawing functions
  • dPixelColor, Zoom and automatic scrollbars
  • Drawing in PHP
  • Drawing in Browser code
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WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
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WINDEV Mobile
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Stored procedures
Identifies the color of a pixel found:
  • in an Image control,
  • in an Image variable.
    WEBDEV - Browser codePHP This type of variable is not available.
  • Versions 25 and later
    WEBDEV - Server code in a WDPic variable (on the background layer),
    New in version 25
    WEBDEV - Server code in a WDPic variable (on the background layer),
    WEBDEV - Server code in a WDPic variable (on the background layer),
  • Versions 25 and later
    WEBDEV - Server code in a picLayer variable.
    New in version 25
    WEBDEV - Server code in a picLayer variable.
    WEBDEV - Server code in a picLayer variable.
Versions 16 and later
WEBDEV - Browser code This function is now available in Browser code.
New in version 16
WEBDEV - Browser code This function is now available in Browser code.
WEBDEV - Browser code This function is now available in Browser code.
Versions 17 and later
Linux This function is now available for WINDEV applications in Linux.
WEBDEV - Server codeLinux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
New in version 17
Linux This function is now available for WINDEV applications in Linux.
WEBDEV - Server codeLinux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Linux This function is now available for WINDEV applications in Linux.
WEBDEV - Server codeLinux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
// Identify the color of the pixel (15, 25)
// in the Image control named "IMG_Drawing"
ResColor = dPixelColor(IMG_ImageDrawing, 15, 25)
Syntax
<Result> = dPixelColor([<Image>, ] <X coordinate> , <Y coordinate>)
<Result>: Integer
Color of the specified pixel in RGB format.
Caution: the value returned may differ according to the display configuration (resolution, ...).
<Image>: Optional control name or optional Image, WDPic or picLayer variable
Versions 24 and later
WindowsLinux Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
  • Versions 25 and later
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
    New in version 25
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WEBDEV - Server code the name of a picLayer variable.
    New in version 25
    WEBDEV - Server code the name of a picLayer variable.
    WEBDEV - Server code the name of a picLayer variable.
If this parameter is not specified, the image specified in dStartDrawing will be used.
This parameter is not available in a report. To specify the image to use, dStartDrawing must be used before the call to dPixelColor.
New in version 24
WindowsLinux Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
  • Versions 25 and later
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
    New in version 25
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WEBDEV - Server code the name of a picLayer variable.
    New in version 25
    WEBDEV - Server code the name of a picLayer variable.
    WEBDEV - Server code the name of a picLayer variable.
If this parameter is not specified, the image specified in dStartDrawing will be used.
This parameter is not available in a report. To specify the image to use, dStartDrawing must be used before the call to dPixelColor.
WindowsLinux Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
  • Versions 25 and later
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
    New in version 25
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
    WEBDEV - Server code the name of an WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WEBDEV - Server code the name of a picLayer variable.
    New in version 25
    WEBDEV - Server code the name of a picLayer variable.
    WEBDEV - Server code the name of a picLayer variable.
If this parameter is not specified, the image specified in dStartDrawing will be used.
This parameter is not available in a report. To specify the image to use, dStartDrawing must be used before the call to dPixelColor.
<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.

How to retrieve the components of the color?

To retrieve the components of the color returned by dPixelColor:
  • To get the red component, use RGBRed (or perform a division modulo 256 of <Result>),
  • To get the green component, use RGBGreen (or perform a division modulo 256 of <Result>/256),
  • To get the blue component, use RGBBlue (or perform a division modulo 256 of <Result>/256/256).

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
    WindowsLinux 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.
    New in version 24
    WindowsLinux 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.
    WindowsLinux 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.
Windows

dPixelColor, Zoom and automatic scrollbars

The option "Automatic scrollbars and zoom" available on an Image control is incompatible with dPixelColor. If this option is used on the Image control, dPixelColor freezes the image in the control. The zoom and the scrollbars are also frozen.
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. 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" pane, "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.
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. 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" pane, "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.
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. 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" pane, "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 : wd250obj.dll
Minimum version required
  • Version 9
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