|
|
|
|
|
|
|
|
|
|
- Coordinates
- Using the drawing functions
dPolyline (Function) In french: dPolyligne Draws a line composed of multiple segments: - in an Image control,
- in a variable of type Image.
The first coordinate indicates the starting point of the first segment, then each coordinate indicates the end of the previous segment and the beginning of the next segment. dStartDrawing(IMG_Drawing)
dPen(DarkGreen, 2, 4)
dPolyline(4, 10, 100, 50, 60, 80, 90, 150, 13)
dStartDrawing(IMG_Drawing)
dPen(DarkGreen, 2, 4)
arrCoordinatesXY is array of 0 by 2 int = [[2, 3], [14, 100], [10,70], [50, 80]]
dPolyline(arrCoordinatesXY)
dPen(IMG_Drawing, DarkGreen, 2, 4)
arrCoordinatesXY2 is array of 0 int = [2, 2, 140, 2, 150, 70, 0, 100, 200,100]
dPolyline(IMG_Drawing, arrCoordinatesXY2)
Syntax
Building a line point by point Hide the details
dPolyline([<Image>, ] <NbPoint> , <X1> , <Y1> , <X2> , <Y2> [, <Xn> [, <Yn> [, <Line color>]]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable <NbPoint>: Integer Number of line segments. This parameter defines the number of <X>, <Y> pairs to specify in the function. <X1>: Integer X-coordinate of the first segment of the line. These coordinates are expressed in pixels. <Y1>: Integer Y-coordinate of the first segment of the line. These coordinates are expressed in pixels. <X2>: Integer X-coordinate of the second segment of the line. These coordinates are expressed in pixels. <Y2>: Integer Y-coordinate of the second segment of the line. These coordinates are expressed in pixels. <Xn>: Optional integer X-coordinate of the N segment of the line. These coordinates are expressed in pixels. <Yn>: Optional integer Y-coordinate of the N segment of the line. These coordinates are expressed in pixels. <Line color>: Integer or constant (optional) Line color. 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.
Building a line via an array of X and Y-coordinates Hide the details
dPolyline([<Image>, ] <Array of coordinates> [, <Line color>])
<Image>: Optional control name or optional Image, WDPic or picLayer variable <Array of coordinates>: Array of integers or array of points WLanguage array of integers containing the coordinates of segments that make up the line. The even indexes represent the X-coordinates while the odd indexes represent the Y-coordinates of the points. These coordinates are expressed in pixels. <Line color>: Integer or constant (optional) Line color. 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 Coordinates Coordinates are specified with respect to the upper-left corner of the image (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
This page is also available for…
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|