- Using the drawing functions
- Drawing in PHP
- Drawing in Browser code
In french: dCercle
// Draw a circle whose background is light yellow and
// whose border is light blue in an Image control
dCircle(10, 10, 50, 50, LightYellow, LightBlue)
dCircle([<Image>, ] <X1> , <Y1> , <X2> , <Y2> [, <Background color> [, <Line color>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
X-coordinate of the upper-left corner of the rectangle containing the circle. These coordinates are expressed in pixels.
Y-coordinate of the upper-left corner of the rectangle containing the circle. These coordinates are expressed in pixels.
X-coordinate of the lower-right corner of the rectangle containing the circle. These coordinates are expressed in pixels.
Y-coordinate of the lower-right corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<Background color>: Integer or constant (optional)
Circle background color. This color can correspond to:If this parameter is not specified, the background color:
- is Transparent if dBackground has not been used beforehand,
- corresponds to the color specified in the last call to dBackground.
<Line color>: Integer or constant (optional)
Color of the circle line. This color can correspond to:If this parameter is not specified, the line color:
- corresponds to the color specified in the last call to dPen,
- is the same as the background color if dPen has not been used.
Coordinates are specified with respect to the upper-left corner of the 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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