PC SOFT

WINDEVWEBDEV AND WINDEV MOBILE
ONLINE HELP

  • Coordinates
  • Drawing with opacity or anti-aliasing
  • Using the drawing functions
WINDEV
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WEBDEV
WindowsLinuxPHPWEBDEV - Browser code
WINDEV Mobile
AndroidAndroid Widget iPhone/iPadApple WatchUniversal Windows 10 AppWindows Mobile
Others
Stored procedures
Draws a polygon:
  • 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 Point and the Color types is now available for Java applications.
New in version 24
Java The syntax that manages the Point and the Color types is now available for Java applications.
Java The syntax that manages the Point and the Color types is now available for Java applications.
// Initialize the drawing in an Image control
dStartDrawing(IMG_Drawing)
// Draw a 4-side polygon whose
// background is light yellow and whose border is light blue
dPolygon(4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)
Versions 24 and later
WINDEVUniversal Windows 10 AppUser code (UMC)
// Draw a 4-side polygon whose
// background is light yellow and whose border is light blue
dPolygon(IMG_Drawing, 4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)
New in version 24
WINDEVUniversal Windows 10 AppUser code (UMC)
// Draw a 4-side polygon whose
// background is light yellow and whose border is light blue
dPolygon(IMG_Drawing, 4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)
WINDEVUniversal Windows 10 AppUser code (UMC)
// Draw a 4-side polygon whose
// background is light yellow and whose border is light blue
dPolygon(IMG_Drawing, 4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)
WINDEVWindowsUser code (UMC)
// Draw a polygon from an array of point coordinates
arrCoordinatesXY is array of 0 by 2 int = [[2, 3], [14, 100], [10,70], [50, 80]]
dPolygon(arrCoordinatesXY)
arrCoordinatesXY2 is array of 0 int = [2, 2, 140, 2, 150, 70, 0, 100, 200,100]
dPolygon(arrCoordinatesXY2)
arrCoordinatesXYC is array of 36 by 2 int
Radius is int = 50
FOR I = 1 TO 36
// x
arrCoordinatesXYC[I][1] = 80  + Cos(I*10) * Radius
// y
arrCoordinatesXYC[I][2] = 60  + Sin(I*10) * Radius
END
dPolygon(arrCoordinatesXYC, LightGray, YellowToolhelp)
Syntax

Building a polygon point by point Hide the details

dPolygon([<Image>, ] <Number of sides> , <X1> , <Y1> , <X2> , <Y2> [, <X3> , <Y3> [... [, <Xn> , <Yn>]]] [, <Background color> [, <Side 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.
<Number of sides>: Integer
Number of sides in the polygon (up to 23 sides). This parameter defines the number of <X>, <Y> pairs to specify in the function.
<X1>: Integer
X coordinate of first point of the polygon. These coordinates are expressed in pixels.
<Y1>: Integer
Y coordinate of first point of the polygon. These coordinates are expressed in pixels.
<X2>: Integer
X coordinate of second point of the polygon. These coordinates are expressed in pixels.
<Y2>: Integer
Y coordinate of second point of the polygon. These coordinates are expressed in pixels.
<X3>: Integer
X coordinate of 3rd point of the polygon. These coordinates are expressed in pixels.
<Y3>: Integer
Y coordinate of 3rd point of the polygon. These coordinates are expressed in pixels.
<Xn>: Optional integer
X coordinate of nth point of the polygon. These coordinates are expressed in pixels.
<Yn>: Optional integer
Y coordinate of nth point of the polygon. These coordinates are expressed in pixels.
<Background color>: Integer or constant (optional)
Background color of polygon. 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.
<Side color>: Integer or constant (optional)
Color of polygon sides. 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.

Building a polygon via an array of X and Y coordinates Hide the details

dPolygon([<Image>, ] <Array of coordinates> [, <Background color> [, <Side 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.
<Array of coordinates>: Array of integers or array of points
  • WLanguage array of integers containing the coordinates of polygon points. The even subscript represent the X coordinates while the odd subscripts represent the Y coordinates of points. These coordinates are expressed in pixels.
  • Versions 22 and later
    WINDEVUniversal Windows 10 App WLanguage array of Point variables containing the coordinates of polygon points. These coordinates are expressed in pixels.
    New in version 22
    WINDEVUniversal Windows 10 App WLanguage array of Point variables containing the coordinates of polygon points. These coordinates are expressed in pixels.
    WINDEVUniversal Windows 10 App WLanguage array of Point variables containing the coordinates of polygon points. These coordinates are expressed in pixels.
    WINDEVUniversal Windows 10 AppJava WLanguage array of Point variables containing the coordinates of polygon points. These coordinates are expressed in pixels.
<Background color>: Integer or constant (optional)
Background color of polygon. 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 in the last call to dBackground.
<Side color>: Integer or constant (optional)
Color of polygon sides. 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

Coordinates

Drawing a polygon:
dPolygon(5, 80, 10, 10, 150, 100, 200, 160, 80, 140, 40)
Drawing a polygon
Coordinates are given with respect to the top left corner of the image (coordinates: (0.0)).
Important: There is no need to close the polygon (the coordinates of last point do not have to be equal to the coordinates of first point). The polygon is automatically "closed".
Limits: a polygon can contain up to 100 000 points in WINDEV, WEBDEV and Java, and up to 1000 points in Windows CE.
WINDEVWindowsJavaUser code (UMC)

Drawing with opacity or anti-aliasing

In the case of a drawing with opacity (dStartDrawing with the dWithOpacity constant) or anti-aliasing (dChangeMode with the drawAntiAliasing constant), the outline is drawn over the inside of the polygon: therefore, the line is partly combined with the inside of the polygon. If the line is very thick, it will be displayed in two colors.

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
This page is also available for…
Comments
Click [Add] to post a comment