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  • Anti-aliasing
  • Using the drawing functions
  • 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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Stored procedures
Changes the drawing mode used by the drawing functions (dLine, dRectangle, ...). The change is applied to the element being drawn. This element can be:
  • an Image control,
  • Versions 17 and later
    WINDEVWEBDEV - Server codeReports and QueriesWindowsLinuxWindows MobileUser code (UMC) an Image variable.
    New in version 17
    WINDEVWEBDEV - Server codeReports and QueriesWindowsLinuxWindows MobileUser code (UMC) an Image variable.
    WINDEVWEBDEV - Server codeReports and QueriesWindowsLinuxWindows MobileUser code (UMC) an Image variable.
    in an Image variable.
    WEBDEV - Browser codeWindows MobilePHP This type of variable is not available.
Versions 16 and later
Android This function is now available for Android applications.
WEBDEV - Browser code This function is now available in Browser code.
New in version 16
Android This function is now available for Android applications.
WEBDEV - Browser code This function is now available in Browser code.
Android This function is now available for Android applications.
WEBDEV - Browser code This function is now available in Browser code.
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
WINDEVWEBDEV - Server codeReports and QueriesAndroidiPhone/iPadWindows MobileJavaAjaxUser code (UMC)
// Initialize the drawing in an Image control
dStartDrawing(IMG_Drawing)

// Draws a rectangle and erases it
dChangeMode(drawXOR)
// Displays the rectangle (in XOR mode)
dRectangle(0, 0, 100, 100)
Multitask(10)
// Erases the rectangle
dRectangle(0, 0, 100, 100)
Versions 24 and later
WINDEVWEBDEV - Server codeReports and QueriesiPhone/iPadWindows MobileAjaxUser code (UMC)
// Draws a rectangle and erases it
dChangeMode(IMG_Drawing, drawXOR)
// Displays the rectangle (in XOR mode)
dRectangle(IMG_Drawing, 0, 0, 100, 100)
Multitask(10)
// Erases the rectangle
dRectangle(IMG_Drawing, 0, 0, 100, 100)
New in version 24
WINDEVWEBDEV - Server codeReports and QueriesiPhone/iPadWindows MobileAjaxUser code (UMC)
// Draws a rectangle and erases it
dChangeMode(IMG_Drawing, drawXOR)
// Displays the rectangle (in XOR mode)
dRectangle(IMG_Drawing, 0, 0, 100, 100)
Multitask(10)
// Erases the rectangle
dRectangle(IMG_Drawing, 0, 0, 100, 100)
WINDEVWEBDEV - Server codeReports and QueriesiPhone/iPadWindows MobileAjaxUser code (UMC)
// Draws a rectangle and erases it
dChangeMode(IMG_Drawing, drawXOR)
// Displays the rectangle (in XOR mode)
dRectangle(IMG_Drawing, 0, 0, 100, 100)
Multitask(10)
// Erases the rectangle
dRectangle(IMG_Drawing, 0, 0, 100, 100)
Syntax
dChangeMode([<Image>, ] <New mode>)
<Image>: Optional control name or optional Image variable
Versions 24 and later
Reports and QueriesWindowsLinuxiPhone/iPadWindows MobileUser code (UMC) Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
    Windows Mobile This type of variable is not available.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
New in version 24
Reports and QueriesWindowsLinuxiPhone/iPadWindows MobileUser code (UMC) Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
    Windows Mobile This type of variable is not available.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
Reports and QueriesWindowsLinuxiPhone/iPadWindows MobileUser code (UMC) Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
    Windows Mobile This type of variable is not available.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<New mode>: Integer constant
Mode for drawing in the image:
drawAntiAliasingUses the GDI+ and/or the features of the video card to draw the lines and the circles without jagged effects. This drawing mode is slower but the results are better than with the standard mode.
WEBDEV - Browser codeWindows Mobile Constant not available.
PHP This drawing mode is not supported.
Java Constant not available.
drawDefaultStandard colors.
drawXORColors applied via an "exclusive or" operation with the background. Erases a drawing if this option is used twice.
CAUTION: This drawing mode is not compatible with the management of opacity (the drawing is not erased anymore).
Caution:
  • The drawing in XOR mode is available for the Image controls only. The drawing in XOR mode is not available for the Image variables.
  • The drawXOR constant cannot be combined with the drawAntiAliasing constant.
PHP The drawing in XOR mode only affects dPoint.
Remarks
WINDEVWEBDEV - Server codeReports and QueriesWindowsAndroidiPhone/iPadJavaUser code (UMC)

Anti-aliasing

The anti-aliasing consists in drawing the lines and the circles without jagged effects. This feature requires the GDI+ framework (which means the WINDEV framework).
Versions 16 and later
Java The anti-aliasing is now availalbe for the Java applications.
Android The anti-aliasing is now available for the Android applications.
New in version 16
Java The anti-aliasing is now availalbe for the Java applications.
Android The anti-aliasing is now available for the Android applications.
Java The anti-aliasing is now availalbe for the Java applications.
Android The anti-aliasing is now available for the Android applications.
Example:
Limits:
  • dChord is not supported in this mode.
  • To avoid the jagged edges, the colors and the lines of elements are smoothed out. Some drawing functions can have an unexpected behavior because the specified colors are no longer found. For example, if a borderline color is specified for dFill, this color is not found: the entire area is filled up.
  • For a drawing with anti-aliasing, dPolygon and dSlice will have the following behavior. The outline is drawn above the inside of polygon: therefore, the line is partly combined with the inside of polygon. If the line is very thick, it will be displayed in two colors.
  • See GDI+ framework for more details.

Using the drawing functions

The drawing functions can be used according to 2 methods:
  • Method 1: Using dDrawing
    • dStartDrawing must be called before any other drawing function. dStartDrawing is used to define the element (Image control or Image variable) onto 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 QueriesWindowsLinuxiPhone/iPadUser 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.
    New in version 24
    Reports and QueriesWindowsLinuxiPhone/iPadUser 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.
    Reports and QueriesWindowsLinuxiPhone/iPadUser 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.
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.
Related Examples:
The drawing functions Unit examples (WINDEV): The drawing functions
[ + ] Using the main drawing functions of WINDEV to:
- Initialize an Image control for drawing
- Draw simple shapes
- Write a text into a drawing
- Change the color in a drawing
Component : wd240pnt.dll
Minimum version required
  • Version 9
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