dCircle (Function)

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dCircle (Function)

In french: dCercle

Draws a circle or an ellipse:

in an Image control,
in a variable of type Image.

Example

See additional examples

// Draw a circle whose background is light yellow and 
// whose border is light blue in an Image control
dStartDrawing(IMG_Drawing)
dCircle(10, 10, 50, 50, LightYellow, LightBlue)

// Draw a circle whose background is light yellow and 
// whose border is light blue in an Image control
dCircle(IMG_Drawing, 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

Image to use. This image can correspond to:
the name of an Image control.
the name of a variable of type Image.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.

<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:
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 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:
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 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.

Drawing a circle using a Rectangle variable Hide the details

dCircle([<Image>, ] <Rectangle> [, <Background color> [, <Line color>]])

<Image>: Optional control name or optional Image, WDPic or picLayer variable

Image to use. This image can correspond to:
the name of an Image control.
the name of a variable of type Image.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.

<Rectangle>: Rectangle variable

Name of the Rectangle variable that corresponds to the rectangle containing the circle.

<Background color>: Integer or constant (optional)

Circle 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 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:
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 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: specify design destination directly in syntax (via parameter)
The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.

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