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  • Coordinates
  • Using the drawing functions
  • Drawing in an image with opacity
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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
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    New in version 17
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    in an Image variable.
  • Versions 25 and later
    WINDEV in a WDPic variable (on the background layer),
    New in version 25
    WINDEV in a WDPic variable (on the background layer),
    WINDEV in a WDPic variable (on the background layer),
  • Versions 25 and later
    WINDEV in a picLayer variable.
    New in version 25
    WINDEV in a picLayer variable.
    WINDEV 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
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
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.
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.
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
    WINDEVWindowsLinuxUser code (UMC) the name of an Image variable.
    New in version 17
    WINDEVWindowsLinuxUser code (UMC) the name of an Image variable.
    WINDEVWindowsLinuxUser code (UMC) the name of an Image variable.
    the name of an Image variable.
  • Versions 25 and later
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    New in version 25
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WINDEV the name of a picLayer variable.
    New in version 25
    WINDEV the name of a picLayer variable.
    WINDEV 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
    WindowsLinuxJavaUser 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
    Java This syntax is now available.
    New in version 25
    Java This syntax is now available.
    Java This syntax is now available.
    New in version 24
    WindowsLinuxJavaUser 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
    Java This syntax is now available.
    New in version 25
    Java This syntax is now available.
    Java This syntax is now available.
    WindowsLinuxJavaUser 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
    Java This syntax is now available.
    New in version 25
    Java This syntax is now available.
    Java 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.
Component : wd250obj.dll
Minimum version required
  • Version 12
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