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  • Limits
  • Coordinates
  • Solid figure
  • Using the drawing functions
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Stored procedures
Draws the chord of a circle (intersection between an ellipse and a straight line):
  • in an Image control,
  • in an Image variable.
Versions 16 and later
Android This function is now available for Android applications.
New in version 16
Android This function is now available for Android applications.
Android This function is now available for Android applications.
Versions 17 and later
iPhone/iPad This function is now available for iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for iPhone/iPad applications.
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
Android The syntax that manages the Color type is now available for Android applications.
New in version 24
Android The syntax that manages the Color type is now available for Android applications.
Android The syntax that manages the Color type is now available for Android applications.
// Initialise le dessin dans un champ Image
dStartDrawing(IMG_Dessin)
// Dessin d'une corde de cercle dont le
// fond est jaune clair et le bord bleu clair
dChord(10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
Versions 24 and later
Universal Windows 10 AppiPhone/iPadIOS WidgetMac Catalyst
// Dessin d'une corde de cercle dont le
// fond est jaune clair et le bord bleu clair
dChord(IMG_Dessin, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
New in version 24
Universal Windows 10 AppiPhone/iPadIOS WidgetMac Catalyst
// Dessin d'une corde de cercle dont le
// fond est jaune clair et le bord bleu clair
dChord(IMG_Dessin, 10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
Universal Windows 10 AppiPhone/iPadIOS WidgetMac Catalyst
// Dessin d'une corde de cercle dont le
// fond est jaune clair et le bord bleu clair
dChord(IMG_Dessin, 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
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac Catalyst Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of a Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
New in version 24
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac Catalyst Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of a Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac Catalyst Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of a Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<X1>: entier
X-coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<Y1>: entier
Y-coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<X2>: entier
X-coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<Y2>: entier
Y-coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels.
<X3>: entier
X-coordinate of start point of the chord. These coordinates are expressed in pixels.
<Y3>: entier
Y-coordinate of start point of the chord. These coordinates are expressed in pixels.
<X4>: entier
X-coordinate of end point of the chord. These coordinates are expressed in pixels.
<Y4>: entier
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 has not been used beforehand,
  • corresponds to the Color specified in the last call to function 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 the dPen function has not been used..
Remarks

Limits

  • The dChord function is not available in Anti-aliasing mode (see the dChangeMode function help for details).
  • 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).
Coordinates are indicated relative to the top left corner of the Image control (coordinates (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
    Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac Catalyst 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. The dStartDrawing function becomes unnecessary. This function must be deleted.
    Versions 25 and later
    Android This syntax is now available.
    New in version 25
    Android This syntax is now available.
    Android This syntax is now available.
    New in version 24
    Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac Catalyst 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. The dStartDrawing function becomes unnecessary. This function must be deleted.
    Versions 25 and later
    Android This syntax is now available.
    New in version 25
    Android This syntax is now available.
    Android This syntax is now available.
    Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac Catalyst 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. The dStartDrawing function becomes unnecessary. This function must be deleted.
    Versions 25 and later
    Android This syntax is now available.
    New in version 25
    Android This syntax is now available.
    Android 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: wd270pnt.dll
Minimum version required
  • Version 9
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