- Coordinates
- Drawing with opacity or anti-aliasing
- Using the drawing functions
dPolygon (Function) In french: dPolygone Draws a polygon: - in an Image control,
- in a variable of type Image.
in a variable of type WDPic (on the background layer), in a variable of type picLayer.
dStartDrawing(IMG_Dessin)
dPolygon(4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)
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
<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: - is Transparent if dBackground has not been 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: - is Transparent if dPen has not been previously used.
For a variable of type Image, the line will be black. - corresponds to the color specified in the last call to dPen.
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
<Array of coordinates>: Array of integers or array of points - WLanguage array of integers containing the coordinates of polygon points. The even indexes represent the X-coordinates while the odd indexes represent the Y-coordinates of the points. These coordinates are expressed in pixels.
 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:- is Transparent if dBackground has not been 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:- is Transparent if dPen has not been previously used.
For a variable of type Image, the line will be black. - corresponds to the color specified in the last call to dPen.
Remarks Coordinates Drawing a polygon:
dPolygon(5, 80, 10, 10, 150, 100, 200, 160, 80, 140, 40)
Coordinates are specified with respect to the upper-left corner of the image (coordinates: (0.0)). Important You don't need to close the polygon (the coordinates of the last point don't have to be equal to the coordinates of the first point). The polygon is automatically "closed". Limits A polygon can have a maximum of 100,000 points in WINDEV, WEBDEV and Java, and 1,000 points in Windows CE.
Related Examples:
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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
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Business / UI classification: Neutral code
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