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  • Using the drawing functions
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Stored procedures
Draws a line:
  • in an Image control,
  • Versions 17 and later
    Reports and QueriesWindows in an Image variable.
    New in version 17
    Reports and QueriesWindows in an Image variable.
    Reports and QueriesWindows in an Image variable.
    in an Image variable.
// Initialize the drawing in an Image control
dStartDrawing(IMG_Drawing)
 
// Draw a line in light yellow
dLine(10, 10, 50, 50, LightYellow)
Versions 24 and later
Reports and Queries
// Draw a line in light yellow
dLine(IMG_Drawing, 10, 10, 50, 50, LightYellow)
New in version 24
Reports and Queries
// Draw a line in light yellow
dLine(IMG_Drawing, 10, 10, 50, 50, LightYellow)
Reports and Queries
// Draw a line in light yellow
dLine(IMG_Drawing, 10, 10, 50, 50, LightYellow)
Syntax
dLine([<Image>, ] <X1> , <Y1> , <X2> , <Y2> [, <Line color> [, <Line thickness>]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
Versions 24 and later
Reports and QueriesWindows Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
New in version 24
Reports and QueriesWindows Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
Reports and QueriesWindows Image to use. This image can correspond to:
  • the name of an Image control.
  • the name of an Image variable.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<X1>: Integer
X coordinate (in pixels) of the start point of the line.
<Y1>: Integer
Y coordinate (in pixels) of the start point of the line.
<X2>: Integer
X coordinate (in pixels) of end point of the line.
<Y2>: Integer
Y coordinate (in pixels) of the end point of the line.
<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 was not used beforehand,
  • corresponds to the color specified in the last call to dPen.
<Line thickness>: Optional integer
Thickness (in pixels) of the line to draw. If this parameter is not specified, the value taken into account can be:
  • the last value specified in the last call to dPen.
  • 1 if dPen was not used beforehand.
Remarks

Coordinates

The coordinates are given in relation to the top left corner of the image or Image control ((0, 0) coordinates).

Using the drawing functions

The drawing functions can be used according to 2 methods:
  • Method 1: Using dStartDrawing
    • 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.
        The drawing will not be displayed if dEndDrawing and dStartDrawing are called in the same process: it will be automatically erased.
  • Versions 24 and later
    Reports and QueriesWindows Method 2: indicating the drawing target directly in the syntax (via a parameter)
    The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
    New in version 24
    Reports and QueriesWindows Method 2: indicating the drawing target directly in the syntax (via a parameter)
    The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
    Reports and QueriesWindows Method 2: indicating the drawing target directly in the syntax (via a parameter)
    The <Image> parameter is used to specify directly the target of the drawing. dStartDrawing becomes useless. This function must be deleted.
Related Examples:
The drawing functions 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 / GUI classification : Neutral code
Component : wd250pnt.dll
Minimum version required
  • Version 9
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