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- Coordinates of the arc
- Drawing a solid figure
- Using the drawing functions
- Drawing in PHP
- Drawing in Browser code
dArc (Function) In french: dArc
dStartDrawing(IMG_MonDessin)
dArc(10, 10, 50, 50, 20, 20, 40, 50, LightYellow)
Syntax
Drawing an arc, specifying all the coordinates of the bounding rectangle Hide the details
dArc([<Image>, ] <X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Line color> [, <Line thickness>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable <X1>: Integer X-coordinate (in pixels) of the upper-left corner of the rectangle containing the circle. <Y1>: Integer Y-coordinate (in pixels) of the upper-left corner of the rectangle containing the circle. <X2>: Integer X-coordinate (in pixels) of the lower-right corner of the rectangle containing the circle. <Y2>: Integer Y-coordinate (in pixels) of the lower-right corner of the rectangle containing the circle. <X3>: Integer X-coordinate (in pixels) of the starting point of the arc. <Y3>: Integer Y-coordinate (in pixels) of the starting point of the arc. <X4>: Integer X-coordinate (in pixels) of the end point of the arc. <Y4>: Integer Y-coordinate (in pixels) of the end point of the arc. <Line color>: Integer or constant (optional) Color of the arc of circle. 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.
<Line thickness>: Optional integer Remarks Coordinates of the arc If the start and end points are not located on the border of the circle (or on the border of the ellipse), the point taken into account corresponds to the intersection between the circle and the line that joins the specified point and the center of the rectangle (which means the center of the circle).
The origin considered for calculating the coordinates corresponds to the top left corner of the image (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.
Limitation for function dArc: Opacity defined with function dBackground is not taken into account.
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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