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  • Limits
  • Coordinates
  • Solid figure
  • Using the drawing functions
WINDEV
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WEBDEV
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WINDEV Mobile
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Stored procedures
Draws the chord of a circle (intersection between an ellipse and a straight line):
  • in an Image control,
  • Versions 17 and later
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    New in version 17
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    WINDEVWindowsLinuxUser code (UMC) in an Image variable.
    in an Image variable.
  • Versions 25 and later
    WINDEV in a WDPic variable (on the background layer),
    New in version 25
    WINDEV in a WDPic variable (on the background layer),
    WINDEV in a WDPic variable (on the background layer),
  • Versions 25 and later
    WINDEV in a picLayer variable.
    New in version 25
    WINDEV in a picLayer variable.
    WINDEV in a picLayer variable.
Versions 15 and later
Linux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
New in version 15
Linux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Linux This function is now available for WEBDEV sites in Linux.
Linux Caution: A specific configuration is required to use this function in Linux. See The drawings for more details.
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Versions 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Versions 24 and later
Java The syntax that manages the Color type is now available for Java applications.
New in version 24
Java The syntax that manages the Color type is now available for Java applications.
Java The syntax that manages the Color type is now available for Java applications.
// Initialize the drawing in an Image control
dStartDrawing(IMG_Drawing)
// Draw the chord of a circle whose
// background is light yellow and whose border is light blue
dChord(10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
Versions 24 and later
WINDEVUniversal Windows 10 AppUser code (UMC)
// Draw the chord of a circle whose
// background is light yellow and whose border is light blue
dChord(IMG_Drawing, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
New in version 24
WINDEVUniversal Windows 10 AppUser code (UMC)
// Draw the chord of a circle whose
// background is light yellow and whose border is light blue
dChord(IMG_Drawing, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
WINDEVUniversal Windows 10 AppUser code (UMC)
// Draw the chord of a circle whose
// background is light yellow and whose border is light blue
dChord(IMG_Drawing, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
Syntax
dChord([<Image>, ] <X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Background color> [, <Line color>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
Versions 24 and later
WindowsLinuxUniversal Windows 10 AppJavaUser code (UMC) Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
  • Versions 25 and later
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    New in version 25
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WINDEV the name of a picLayer variable.
    New in version 25
    WINDEV the name of a picLayer variable.
    WINDEV the name of a picLayer variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
New in version 24
WindowsLinuxUniversal Windows 10 AppJavaUser code (UMC) Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
  • Versions 25 and later
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    New in version 25
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WINDEV the name of a picLayer variable.
    New in version 25
    WINDEV the name of a picLayer variable.
    WINDEV the name of a picLayer variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
WindowsLinuxUniversal Windows 10 AppJavaUser code (UMC) Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
  • Versions 25 and later
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    New in version 25
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
    WINDEV the name of a WDPic variable. Only the background layer will be handled.
  • Versions 25 and later
    WINDEV the name of a picLayer variable.
    New in version 25
    WINDEV the name of a picLayer variable.
    WINDEV the name of a picLayer variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<X1>: Integer
X coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<Y1>: Integer
Y coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<X2>: Integer
X coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<Y2>: Integer
Y coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<X3>: Integer
X coordinate of start point of the chord. These coordinates are expressed in pixels.
<Y3>: Integer
Y coordinate of start point of the chord. These coordinates are expressed in pixels.
<X4>: Integer
X coordinate of end point of the chord. These coordinates are expressed in pixels.
<Y4>: Integer
Y coordinate of end point of the chord. These coordinates are expressed in pixels.
<Background color>: Integer or constant (optional)
Background color of chord. This color can correspond to:
If this parameter is not specified, the background color:
  • is Transparent if dBackground was not used beforehand,
  • corresponds to the color specified during the last call to dBackground.
<Line color>: Integer or constant (optional)
Line color for the circle chord. 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 identical to the color used for the background if dPen was not used.
Remarks

Limits

  • dChord is not available in Anti-aliasing mode (for more details, see the help on dChangeMode).
  • dChord is not available for a drawing with management of alpha channel (see the help about dStartDrawing for more details). This function has no effect.

Coordinates

If the start and end points are not located on the outline of the circle (or on the outline of the ellipse), the point taken into account is 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).
The coordinates are specified with respect to the top left corner of the Image control (coordinates set to (0,0)).

Solid figure

dChord can only be used to draw a chord: outline only or chord area. To draw a solid figure (portion defined by the center of the circle and the two points on the circle), use 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.
  • Versions 24 and later
    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.
    Versions 25 and later
    Java This syntax is now available.
    New in version 25
    Java This syntax is now available.
    Java This syntax is now available.
    New in version 24
    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.
    Versions 25 and later
    Java This syntax is now available.
    New in version 25
    Java This syntax is now available.
    Java This syntax is now available.
    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.
    Versions 25 and later
    Java This syntax is now available.
    New in version 25
    Java This syntax is now available.
    Java This syntax is now available.
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 : wd250pnt.dll
Minimum version required
  • Version 9
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