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  • Special cases
  • Drawing functions, zoom and automatic scrollbars
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Stored procedures
Deletes all the drawings made since the last call to dStartDrawing.
In the case of an Image control, the current drawing is deleted.
In the case of a variable, the memory used is released.

Remark: The call to dEndDrawing is optional. The resources are automatically released when the window or page is closed.
Linux Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.
Example
// Destroy the drawing found in the "IMG_Drawing" control
dEndDrawing(IMG_Drawing)
Syntax
dEndDrawing([<Element>])
<Element>: Optional control name or optional Image, WDPic or picLayer variable
Element to handle:
  • Name of an Image control to erase.
  • Name of a variable of type Image.
  • WINDEV Name of a variable of type WDPic. Only the background layer will be handled.
  • WINDEV Name of a variable of type picLayer.
If this parameter is not specified:
  • all the Image controls in the current window will be deleted.
  • all the images will be removed from memory.
Remarks

Special cases

  • dStartDrawing must be called before using the drawing functions. dStartDrawing is used to define the element (Image control or Image variable) onto which the drawing functions will be applied.
  • For 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 Windows 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.
WINDEVUser code (UMC)

Drawing functions, zoom and automatic scrollbars

The "Automatic scrollbars and zoom" option, available for Image controls, is not compatible with dStartDrawing. If this option is used on the Image control, dStartDrawing freezes the image in the control. The zoom and the scrollbars are also frozen. The standard behavior is restored when dEndDrawing is called.
Related Examples:
WD Magnifier Complete examples (WINDEV): WD Magnifier
[ + ] This example enables you to zoom part of the screen with a magnifier.
The maximum zoom value is set to 8.
Summary of the example supplied with WINDEV:
The WLanguge function named dCopyBlt() and the WLanguage property named ..Opacity allow you to perform a capture of the Windows desktop at the location of a window without this window appearing in the screen shot.
This example uses this tip to zoom the part of the screen found below the magnifier.
Component: wd290pnt.dll
Minimum version required
  • Version 9
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Last update: 01/16/2024

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