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  • 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,
  • Versions 17 and later
    Reports and QueriesWindows in an Image variable.
    New in version 17
    Reports and QueriesWindows in an Image variable.
    Reports and QueriesWindows in an Image variable.
    in an Image variable.
The arc is drawn anticlockwise.
// Initialize the drawing in the Image control IMG_MyDrawing
dStartDrawing(IMG_MyDrawing)
 
// Draw an arc of circle in light yellow
dArc(10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
Versions 24 and later
Reports and QueriesWindows
// Draw an arc of circle in light yellow
dArc(IMG_MyDrawing,10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
New in version 24
Reports and QueriesWindows
// Draw an arc of circle in light yellow
dArc(IMG_MyDrawing,10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
Reports and QueriesWindows
// Draw an arc of circle in light yellow
dArc(IMG_MyDrawing,10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
Syntax

Drawing an 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 variable
Versions 24 and later
Reports and QueriesWindows Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
New in version 24
Reports and QueriesWindows Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
Reports and QueriesWindows Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<X1>: Integer
X coordinate (in pixels) of top left corner of the rectangle containing the circle.
<Y1>: Integer
Y coordinate (in pixels) of top left corner of the rectangle containing the circle.
<X2>: Integer
X coordinate (in pixels) of bottom right corner of the rectangle containing the circle.
<Y2>: Integer
Y coordinate (in pixels) of bottom right corner of the rectangle containing the circle.
<X3>: Integer
X coordinate (in pixels) of start point of the arc of circle.
<Y3>: Integer
Y coordinate (in pixels) of start point of the arc of circle.
<X4>: Integer
X coordinate (in pixels) of end point of the arc of circle.
<Y4>: Integer
Y coordinate (in pixels) of end point of the arc of circle.
<Line color>: Integer or constant (optional)
Color of the arc of circle. This color corresponds to:If this parameter is not specified, the line color:
  • is Transparent if dPen was not used beforehand,
  • corresponds to the color specified in the last call to dPen.
<Line thickness>: Optional integer
Remarks

Coordinates of the arc

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

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 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 QueriesWindows 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 QueriesWindows 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 QueriesWindows 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.
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
Component : wd240pnt.dll
Minimum version required
  • Version 9
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