<Image variable>.DrawPolygon (Function)

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Coordinates
Drawing with opacity or anti-aliasing

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<Image variable>.DrawPolygon (Function)

In french: <Variable Image>.DessinePolygone

Draws a polygon in an Image variable.

Example

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

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 Image 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 <Image variable>.Background was not used beforehand,
corresponds to the color specified during 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 preset color of WLanguage.
If this parameter is not specified, the line color:
corresponds to the color specified during the last call to <Image variable>.Pen,
is identical to the color used for the background if <Image variable>.Pen was not used.

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

<Image variable>.dPolygon(<Array of coordinates> [, <Background color> [, <Side color>]])

<Image variable>: Image variable

Name of Image 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.
Versions 22 and later
WLanguage array of Point variables containing the coordinates of polygon points. These coordinates are expressed in pixels.
New in version 22
WLanguage array of Point variables containing the coordinates of polygon points. These coordinates are expressed in pixels.
WLanguage array of Point variables containing the coordinates of polygon 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,
Versions 22 and later
a Color variable.
New in version 22
a Color variable.
a Color variable. a Color variable.
If this parameter is not specified, the background color:
is Transparent if <Image variable>.Background was not used beforehand,
corresponds to the color specified during 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 preset color of WLanguage,
Versions 22 and later
a Color variable.
New in version 22
a Color variable.
a Color variable. a Color variable.
If this parameter is not specified, the line color:
corresponds to the color specified in the last call to <Image variable>.Pen,
is identical to the background color if <Image variable>.Pen was not used.

Remarks

Coordinates

Drawing a polygon:

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

The coordinates are specified in relation to the top left corner of the Image control (coordinates set to (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

For an image with opacity (<Image variable>.StartDrawing with the constant dWithOpacity) or anti-aliasing (<Image variable>.ChangeMode with the constant drawAntiAliasing), the outline is drawn over the inside of the polygon: therefore, the line is partly combined with the inside of 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

Component : wd240pnt.dll