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- Limits
- Coordinates
- Solid figure
- Drawing in PHP
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<picLayer variable>.DrawChord (Function) In french: <Variable picCalque>.DessineCorde Draws the chord of a circle (intersection between an ellipse and a straight line) in a picLayer variable.  Versions 15 and later New in version 15
MyImage is WDPic = "Test.gif"
MyLayer is picLayer
// In a layer, draw the chord of a circle whose
// background is light yellow and whose border is light blue
MyLayer.DrawChord(10, 10, 50, 50, 20, 20, 40, 50, LightYellow, LightBlue)
IMG_MyDrawing = MyImage
Syntax
<picLayer image>.DrawChord(<X1> , <Y1> , <X2> , <Y2> , <X3> , <Y3> , <X4> , <Y4> [, <Background color> [, <Line color>]])
<picLayer image>: picLayer variable Name of the picLayer variable to use. <X1>: Integer X coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels. <Y1>: Integer Y coordinate of top left corner of the rectangle containing the circle. These coordinates are expressed in pixels. <X2>: Integer X coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels. <Y2>: Integer Y coordinate of bottom right corner of the rectangle containing the circle. These coordinates are expressed in pixels. <X3>: Integer X coordinate of start point of the chord. These coordinates are expressed in pixels. <Y3>: Integer Y coordinate of start point of the chord. These coordinates are expressed in pixels. <X4>: Integer X coordinate of end point of the chord. These coordinates are expressed in pixels. <Y4>: Integer Y coordinate of end point of the chord. These coordinates are expressed in pixels. <Background color>: Integer or constant (optional) Background color of 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 during the last call to <Image>.Pen,
- is identical to the color used for the background if <Image>.Pen has not been used.
Remarks Limits - <picLayer variable>.DrawChord is not available in anti-aliasing mode (for more details, see the help about <picLayer variable>.ChangeMode).
- <picLayer variable>.DrawChord is not available for a drawing with management of alpha channel (see the help about <picLayer variable>.StartDrawing for more details). 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 top left corner of the Image control (coordinates set to (0,0)). Solid figure <picLayer 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 <picLayer variable>.DrawSlice.
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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