• Limitations
• Coordinates
• Solid figure
WINDEV
WEBDEV
WINDEV Mobile
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<Image variable>.DrawChord (Function)
In french: <Variable Image>.DessineCorde
Draws the chord of a circle (intersection between an ellipse and a straight line) in an Image control.
Example
// In an Image control, draw the chord of a circle whose
// background is light yellow and whose border is light blue
IMG_Drawing.DrawChord(10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
Syntax
<Image variable>.DrawChord(<X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Background color> [, <Line color>]])
<Image variable>: Image variable
Name of the Image control 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 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:
<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:
• corresponds to the color specified in the last call to <Image>.Pen,
• is the same as the background color if <Image>.Pen has not been used.
Remarks

Limitations

• <Image variable>.DrawChord is not available in anti-aliasing mode (for more details, see the help about <Image>.ChangeMode).
• <Image variable>.DrawChord is not available for a drawing with management of alpha channel (for more details, see the help about <Image>.StartDrawing). 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).
The coordinates are specified with respect to the upper-left corner of the Image control (coordinates set to (0,0)).

Solid figure

<Image variable>.DrawChord can only be used to draw a chord: outline 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 <Image>.DrawSlice.
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: wd270pnt.dll
Minimum version required
• Version 24