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Help / WLanguage / WLanguage functions / Controls, pages and windows / Drawing functions
  • Coordinates of the arc
  • Drawing a solid figure
  • Using the drawing functions
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Stored procedures
Draws an arc of circle or an arc of ellipse:
  • in an Image control,
  • in a variable of type Image.
  • WINDEV in a variable of type WDPic (on the background layer),
  • WINDEV in a variable of type picLayer.
The arc is drawn counterclockwise.

Linux Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.
// Initialise le dessin dans le champ Image IMG_MonDessin
dStartDrawing(IMG_MonDessin)

// Dessin d'un arc de cercle jaune clair
dArc(10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
WindowsLinuxUniversal Windows 10 AppJavaUser code (UMC)
// Dessin d'un arc de cercle jaune clair dans le champ Image IMG_MonDessin
dArc(IMG_MonDessin, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
Syntax

Draw an arc, specifying all the coordinates of the rectangle containing the arc Hide the details

dArc([<Image>, ] <X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Line color> [, <Line thickness>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
WindowsLinuxUniversal Windows 10 AppJavaUser code (UMC) Image to use. The image can correspond to:
  • the name of an Image control.
  • the name of a variable of type Image.
  • WINDEV the name of a variable of type WDPic. Only the background layer will be handled.
  • WINDEV 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 upper-left corner of the rectangle containing the circle.
<Y1>: Integer
Y-coordinate (in pixels) of the upper-left corner of the rectangle containing the circle.
<X2>: Integer
X-coordinate (in pixels) of the lower-right corner of the rectangle containing the circle.
<Y2>: Integer
Y-coordinate (in pixels) of the lower-right corner of the rectangle containing the circle.
<X3>: Integer
X-coordinate (in pixels) of the starting point of the arc.
<Y3>: Integer
Y-coordinate (in pixels) of the starting point of the arc.
<X4>: Integer
X-coordinate (in pixels) of the end point of the arc.
<Y4>: Integer
Y-coordinate (in pixels) of the end point of the arc.
<Line color>: Integer or constant (optional)
Color of the arc of circle. 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
WINDEVUniversal Windows 10 AppJava Thickness (in pixels) of the arc of circle 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.
New in version 2024
WINDEVLinuxUniversal Windows 10 AppJava

Drawing an arc using a Rectangle Variable Hide the details

dArc([<Image>, ] <Rectangle> , <X3> , <Y3> , <X4> , <Y4> [, <Line color> [, <Line thickness>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
WindowsLinuxUniversal Windows 10 AppJavaUser code (UMC) Image to use. The image can correspond to:
  • the name of an Image control.
  • the name of a variable of type Image.
  • WINDEV the name of a variable of type WDPic. Only the background layer will be handled.
  • WINDEV the name of a variable of type picLayer.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<Rectangle>: Rectangle variable
Name of the Variable type Rectangle Receiver in which the circle is inscribed..
<X3>: entier
X-coordinate (in pixels) of the starting point of the arc.
<Y3>: entier
Y-coordinate (in pixels) of the starting point of the arc.
<X4>: entier
X-coordinate (in pixels) of the end point of the arc.
<Y4>: entier
Y-coordinate (in pixels) of the end point of the arc.
<Line color>: Integer or constant (optional)
Color of the arc of circle. 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
WINDEVUniversal Windows 10 AppJava Thickness (in pixels) of the arc of circle 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 of the arc

If the start and end points are not located on the border of the circle (or on the border of the ellipse), the point taken into account corresponds to the intersection between the circle and the line that joins the specified point and the center of the rectangle (which means the center of the circle).
Coordinates of the arc
The origin used to calculate the coordinates corresponds to the upper-left corner of the image (coordinates: (0,0)).

Drawing a solid figure

To draw a solid figure (a full arc), use dChord or dSlice.

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.
  • WindowsLinuxUniversal Windows 10 AppJavaUser 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.
Limitation for dArc: The opacity defined by dBackground is ignored.
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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