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  • Special cases
  • Drawing functions, zoom and automatic scrollbars
  • Drawing in PHP
  • Drawing in Browser code
WINDEV
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WEBDEV
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WINDEV Mobile
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Others
Stored procedures
Frees the image from memory. For a drawing performed in an Image control, the current drawing is destroyed.
Note: The call to dEndDrawing is optional. The resources are automatically freed when the window or the page is closed.
Versions 15 and later
WEBDEV - Server codeLinux This function is now available for the 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 15
WEBDEV - Server codeLinux This function is now available for the WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
WEBDEV - Server codeLinux This function is now available for the WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
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.
Universal Windows 10 App This function is now available for the Windows Phone applications.
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.
Universal Windows 10 App This function is now available for the Windows Phone applications.
Android This function is now available for the Android applications.
WEBDEV - Browser code This function is now available in Browser code.
Universal Windows 10 App This function is now available for the Windows Phone applications.
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.
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Versions 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Example
// Destroy the drawing found in the "IMG_Drawing" control
dEndDrawing(IMG_Drawing)
Syntax
dEndDrawing([<Element>])
<Element>: Image variable or character string (with or without quotes)
Element to use:
  • Name of Image control to erase.
  • Versions 17 and later
    WINDEVWEBDEV - Server codeReports and QueriesWindowsLinuxUser code (UMC) Name of Image variable.
    New in version 17
    WINDEVWEBDEV - Server codeReports and QueriesWindowsLinuxUser code (UMC) Name of Image variable.
    WINDEVWEBDEV - Server codeReports and QueriesWindowsLinuxUser code (UMC) Name of Image variable.
  • Name of Image variable.
    WEBDEV - Browser codeWindows MobilePHP This type of variable is not available.
If this parameter is not specified:
  • all the Image controls found in the current window will be erased.
  • all the images will be freed 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 option "Zoom and automatic scrollbars" available for an Image control is not compatible with dStartDrawing. If this option is used on the Image control, the display performed by dStartDrawing is fixed in the control. The zoom and the scrollbars are also fixed. The standard behavior is restored during the call to dEndDrawing.
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.
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.
Components
WINDEVWEBDEV - Server codeReports and Queries wd230pnt.dll
Windows Mobile wp230pnt.dll
WEBDEV - Browser code WDJS.DLL
Java wd230java.jar
Linux wd230pnt.so
Android wd230android.jar
Minimum required version
  • Version 9
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