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Stored procedures
Draws a polygon in an Image control.
Linux Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.
Example
// Draw a 4-side polygon whose
// background is light yellow and whose border is light blue
IMG_Dessin.DrawPolygon(4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)
Syntax

Building a polygon point by point Hide the details

<Image variable>.DrawPolygon(<Number of sides> , <X1> , <Y1> , <X2> , <Y2> [, <X3> , <Y3> [... [, <Xn> , <Yn>]]] [, <Background color> [, <Side color>]])
<Image variable>: Image variable
Name of the Image control to be used.
<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)
Polygon background color. This color can correspond to:
If this parameter is not specified, the background color:
<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 <Image>.Pen,
  • is the same as the background color if <Image>.Pen has not been used.

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

<Image variable>.DrawPolygon(<Array of coordinates> [, <Background color> [, <Side color>]])
<Image variable>: Image variable
Name of the Image control to be used.
<Array of coordinates>: Array of integers or array of points
  • WLanguage array of integers containing the coordinates of polygon points. The even indices represent the X-coordinates while the odd indices represent the Y-coordinates of the points. These coordinates are expressed in pixels.
  • WINDEVWEBDEV - Server codeUniversal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava WLanguage array of Point variables containing the coordinates of the polygon points. These coordinates are expressed in pixels.
<Background color>: Integer or constant (optional)
Polygon background color. This color can correspond to:If this parameter is not specified, the background color:
<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 <Image>.Pen,
  • is the same as the background color if <Image>.Pen has not been used.
Reports and QueriesWindowsLinuxiPhone/iPadUser code (UMC)

Building a polygon from a variable of type Polygon Hide the details

<Image variable>.DrawPolygon(<Polygon> [, <Background color> [, <Side color>]])
<Image variable>: Image variable
Name of the Image control to be used.
<Polygon>: Polygon variable
Name of the Polygon variable that describes the different points of the polygon.
<Background color>: Integer or constant (optional)
Polygon background color. This color can correspond to:If this parameter is not specified, the background color:
<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 <Image>.Pen,
  • is the same as the background color if <Image>.Pen has not been used.
Remarks

Coordinates

Drawing a polygon:
IMG_Drawing.DrawPolygon(5, 80, 10, 10, 150, 100, 200, 160, 80, 140, 40)
Drawing a polygon
Coordinates are given with respect to the upper-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.
WINDEVWEBDEV - Server codeReports and QueriesWindowsAndroidJavaUser code (UMC)Ajax

Drawing with opacity or anti-aliasing

For a drawing with opacity (<Image>.StartDrawing with the dWithOpacity constant) or anti-aliasing (<Image>.ChangeMode with the drawAntiAliasing constant), the outline is drawn inside 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.
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: wd280pnt.dll
See also
Minimum version required
  • Version 24
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