<picLayer variable>.DrawPolygon (Function)

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<picLayer variable>.DrawPolygon (Function)

In french: <Variable picCalque>.DessinePolygone

Draws a polygon in an picLayer variable.

Versions 15 and later

This function is now available for WEBDEV sites in Linux.

New in version 15

This function is now available for WEBDEV sites in Linux.

Example

MyWDPicImage is WDPic = "Test.gif"
MyLayer is picLayer

// Draw a 4-side polygon whose
// background is light yellow and whose border is light blue
MyLayer.DrawPolygon(4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)
IMG_MyDrawing = MyWDPicImage

Syntax

Building a polygon point by point Hide the details

<picLayer image>.DrawPolygon(<Number of sides> , <X1> , <Y1> , <X2> , <Y2> [, <X3> , <Y3> [... [, <Xn> , <Yn>]]] [, <Background color> [, <Side color>]])

<picLayer image>: picLayer variable

Name of the picLayer variable to use.

<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:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a preset color of WLanguage.
If this parameter is not specified, the background color:
is Transparent if <picLayer variable>.Background was not used beforehand,
corresponds to the color specified in the last call to <picLayer variable>.Background.

<Side color>: Integer or constant (optional)

Color of polygon sides. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a preset color of WLanguage.
If this parameter is not specified, the line color:
corresponds to the color specified in the last call to <Image>.Pen,
is identical to the color used for the background if <Image>.Pen has not been used.

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

<picLayer image>.DrawPolygon(<Array of coordinates> [, <Background color> [, <Side color>]])

<picLayer image>: picLayer variable

Name of the picLayer variable to use.

<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.
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:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a preset color of WLanguage,
a Color variable.
If this parameter is not specified, the background color:
is Transparent if <picLayer variable>.Background was not used beforehand,
corresponds to the color specified in the last call to <picLayer variable>.Background.

<Side color>: Integer or constant (optional)

Color of polygon sides. This color can correspond to:
an RGB color (returned by RGB),
an HSL color (returned by HSL),
a preset color of WLanguage,
a Color variable.
If this parameter is not specified, the line color:
corresponds to the color specified in the last call to <Image>.Pen,
is identical to the color used for the background if <Image>.Pen has not been used.

Remarks

Coordinates

Drawing a polygon:

MyImage is WDPic
MyLayer is picLayer

MyLayer.DrawPolygon(5, 80, 10, 10, 150, 100, 200, 160, 80, 140, 40)

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.

Drawing with opacity or anti-aliasing

In the case of a drawing with opacity (<picLayer variable>.StartDrawing with the dWithOpacity constant) or anti-aliasing (<picLayer variable>.ChangeMode 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.

Related Examples:

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