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- Coordinates
- Using the drawing functions
- Drawing in PHP
- Drawing in Browser code
dCircle (Function) In french: dCercle
dStartDrawing(IMG_Dessin)
dCircle(10, 10, 50, 50, LightYellow, LightBlue)
Syntax
Drawing a circle, specifying all the coordinates of the rectangle containing the circle Hide the details
dCircle([<Image>, ] <X1> , <Y1> , <X2> , <Y2> [, <Background color> [, <Line color>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
<X1>: Integer X-coordinate of the upper-left corner of the rectangle containing the circle. These coordinates are expressed in pixels. <Y1>: Integer Y-coordinate of the upper-left corner of the rectangle containing the circle. These coordinates are expressed in pixels. <X2>: Integer X-coordinate of the lower-right corner of the rectangle containing the circle. These coordinates are expressed in pixels. <Y2>: Integer Y-coordinate of the lower-right corner of the rectangle containing the circle. These coordinates are expressed in pixels. <Background color>: Integer or constant (optional) Circle 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.
<Line color>: Integer or constant (optional) Color of the circle line. This color can correspond to:If this parameter is specified, the characteristics defined with dPen are ignored. The line thickness will be set to 1. 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 Coordinates are specified with respect to the upper-left corner of the Image control (coordinates: (0,0)). Using the drawing functions The drawing functions can be used according to 2 methods: - Method 1: Using the dDrawingStartfunction
- dStartDrawing must be called before any other drawing function. dStartDrawing is used to define the element (Image control or variable) to which the drawing functions will be applied.
- When drawing on an Image control:
- The drawing functions operate on a copy ("bitmap") of the image. You can use the drawing functions of Windows (via API or CallDLL32) but these functions must use the DC (Device Context) returned by dStartDrawing.
- dEndDrawing and dStartDrawing must not be called in the same process.
If function dEndDrawing is called in the same process as function dStartDrawing, the drawing will not appear: it will be automatically deleted.
 Method 2: Indicate the design destination directly in the syntax (via a parameter) The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
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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