<Image variable>.DrawSlice (Function)

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<Image variable>.DrawSlice (Function)

In french: <Variable Image>.DessinePortion

Draws a section of a circle or an ellipse in a variable of type Image.

Caution: A specific configuration is required to use this function in Linux. For more details, see The drawings.

Example

MyImage is Image = "Test.gif"
// Draw a circle section whose
// background is light yellow and whose border is light blue
MyImage.DrawSlice(10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
IMG_MyDrawing = MyImage

Syntax

<Image variable>.DrawSlice(<X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Background color> [, <Line color>]])

<Image variable>: Image variable

Name of the Image variable to be used.

<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 circle section. These coordinates are expressed in pixels.

<Y3>: Integer

Y-coordinate of the start point of the circle section. These coordinates are expressed in pixels.

<X4>: Integer

X-coordinate of the end point of the circle section. These coordinates are expressed in pixels.

<Y4>: Integer

Y-coordinate of the end point of the circle section. These coordinates are expressed in pixels.

<Background color>: Integer or constant (optional)

Background color of the circle section. 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 <Image variable>.Background has not been used beforehand,
corresponds to the color specified in the last call to <Image variable>.Background.

<Line color>: Integer or constant (optional)

Color of the line for the circle section. 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 line color:
corresponds to the color specified in the last call to <Image variable>.Pen,
is the same as the background color if <Image variable>.Pen has not been used.

Remarks

Coordinates

If the start point and the end point 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).

Coordinates are specified with respect to the upper-left corner of the image (coordinates: (0.0)).

The drawing sections are drawn anticlockwise.

Non-solid figure

To draw a non-solid figure (without taking into account the center of the circle), use <Image variable>.DrawChord.

Drawing with opacity or anti-aliasing

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

Business / UI classification: Neutral code

Component: wd280pnt.dll