<Image>.DrawPolygon (Function)

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Drawing with opacity or anti-aliasing

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<Image>.DrawPolygon (Function)

In french: <Image>.DessinePolygone

Draws a polygon in an Image control.

Example

// Dessin d'un polygone à 4 côtés dont le 
// fond est jaune clair et le bord bleu clair
IMG_Dessin.DessinePolygone(4, 10, 20, 20, 50, 40, 60, 50, 10, LightYellow, LightBlue)

Syntax

Building a polygon point by point Hide the details

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

<Image control>: Control name

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

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

<Image control>.DrawPolygon(<Array of coordinates> [, <Background color> [, <Side color>]])

<Image control>: Control name

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 indexes represent the X-coordinates while the odd indexes represent the Y-coordinates of the points. These coordinates are expressed in pixels.

<Background color>: Integer or constant (optional)

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

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

<Image control>.DrawPolygon(<Polygon> [, <Background color> [, <Side color>]])

<Image control>: Control name

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

Remarks

Coordinates

Drawing a polygon:

IMG_Dessin.DessinePolygone(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.

Drawing with opacity or anti-aliasing

In the case of drawing with opacity (function <Image>.StartDrawing with constant dWithOpacity) or anti-aliasing (function <Image>.ChangeMode with constant drawingAntiAliasing), the outline is drawn on top of the polygon interior: the line is therefore partly combined with the polygon interior. 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: wd300pnt.dll