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Help / WLanguage / WLanguage functions / Controls, pages and windows / Drawing functions
  • Coordinates
  • Using the drawing functions
  • Pattern and PHP
  • Drawing in Browser code
WINDEV
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WEBDEV
WindowsLinuxPHPWEBDEV - Browser code
WINDEV Mobile
AndroidAndroid Widget iPhone/iPadIOS WidgetApple WatchMac CatalystUniversal Windows 10 App
Others
Stored procedures
Draws a line:
  • in an Image control,
  • in a variable of type Image.
    WEBDEV - Browser codePHP This type of variable is not available.
  • WINDEVWEBDEV - Server code in a variable of type WDPic (on the background layer),
  • WINDEVWEBDEV - Server code in a variable of type picLayer.
Linux Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.
// Initialise le dessin dans un champ Image
dStartDrawing(IMG_Dessin)

// Dessin d'une ligne jaune clair
dLine(10, 10, 50, 50, LightYellow)
WINDEVWEBDEV - Server codeReports and QueriesUniversal Windows 10 AppiPhone/iPadIOS WidgetMac CatalystUser code (UMC)Ajax
// Dessin d'une ligne jaune clair
dLine(IMG_Dessin, 10, 10, 50, 50, LightYellow)
Syntax
dLine([<Image>, ] <X1> , <Y1> , <X2> , <Y2> [, <Line color> [, <Line thickness>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
Reports and QueriesWindowsLinuxUniversal Windows 10 AppiPhone/iPadIOS WidgetMac CatalystUser code (UMC) Image to use. The image can correspond to:
  • the name of an Image control.
  • the name of a variable of type Image.
  • WINDEVWEBDEV - Server code the name of a variable of type WDPic. Only the background layer will be handled.
  • WINDEVWEBDEV - Server code the name of a variable of type picLayer.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<X1>: Integer
X-coordinate (in pixels) of the start point of the line.
<Y1>: Integer
Y-coordinate (in pixels) of the start point of the line.
<X2>: Integer
X-coordinate (in pixels) of the end point of the line.
<Y2>: Integer
Y-coordinate (in pixels) of the end point of the line.
<Line color>: Integer or constant (optional)
Line color. This color can correspond to:If this parameter is not specified, the line color:
  • is Transparent if the function dPen has not been used before.
    New in version 2024
    In the case of an Variable type Image, the row will have the black Color..
  • corresponds to the color specified in the last call to dPen.
<Line thickness>: Optional integer
Thickness (in pixels) of the line to draw. If this parameter is not specified, the value taken into account can be:
  • the last value specified in the last call to dPen.
  • 1 if dPen was not used beforehand.
Remarks

Coordinates

Coordinates are specified with respect to the upper-left corner of the image or Image control (coordinates: (0,0)).

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.
  • Reports and QueriesWindowsLinuxUniversal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJavaUser 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.
PHP

Pattern and PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting providers 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.
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 project description window.
Reminder: To open the project description window, go to the "Project" tab, "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.
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
Business / UI classification: Neutral code
Component: wd290pnt.dll
Minimum version required
  • Version 9
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Last update: 01/18/2024

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