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- Limitations
- Coordinates
- Solid figure
- Using the drawing functions
- Drawing in PHP
- Drawing in Browser code
dChord (Function) In french: dCorde
dStartDrawing(IMG_Dessin)
dChord(10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
Syntax
Drawing a chord, specifying all the coordinates of the bounding rectangle Hide the details
dChord([<Image>, ] <X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <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. <X3>: Integer X-coordinate of the start point of the chord. These coordinates are expressed in pixels. <Y3>: Integer Y-coordinate of the start point of the chord. These coordinates are expressed in pixels. <X4>: Integer X-coordinate of the end point of the chord. These coordinates are expressed in pixels. <Y4>: Integer Y-coordinate of the end point of the chord. These coordinates are expressed in pixels. <Background color>: Integer or constant (optional) Background color of the chord. 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) Line color for the circle chord. 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.
Remarks Limitations - dChord is not available in anti-aliasing mode (for more details, see the help about dChangeMode).
- dChord is not available for a drawing with management of alpha channel (for more details, see the help about dStartDrawing). This function has no effect.
Coordinates If the start and end points are not located on the outline of the circle (or on the outline of the ellipse), the point taken into account is 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).
Coordinates are specified with respect to the upper-left corner of the Image control (coordinates: (0,0)). Solid figure The dChord function can only be used to draw a chord: contour only or chord area.. To draw a solid figure (portion defined by the center of the circle and the two points on the circle), use dSlice. 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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