- Using the drawing functions
- Drawing in PHP
- Drawing in Browser code
In french: dLigne
// Initialize the drawing in an Image control
// Draw a line in light yellow
dLine(10, 10, 50, 50, LightYellow)
dLine([<Image>, ] <X1> , <Y1> , <X2> , <Y2> [, <Line color> [, <Line thickness>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
X-coordinate (in pixels) of the start point of the line.
Y-coordinate (in pixels) of the start point of the line.
X-coordinate (in pixels) of the end point of the line.
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 dPen has not been used beforehand,
- 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.
Coordinates are specified with respect to the upper-left corner of the image or Image control (coordinates: (0,0)).
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.
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 description window of project.
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.
Unit examples (WINDEV): The drawing functions
Business / UI classification: Neutral code
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