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  • Using the drawing functions
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Stored procedures
Declares the default background color for the rectangles, circles, etc.::
  • in an Image control,
  • in a variable of type Image.
Example
// Initialize the drawing in an Image control
dStartDrawing(IMG_Drawing)
 
// Declare the background color of different drawings
// made in the Image control
dBackground(LightGreen)
Reports and Queries
// Declare the background color of different drawings
// made in the Image control IMG_Drawing
dBackground(IMG_Drawing, LightGreen)
Syntax
dBackground([<Image>, ] <Color> [, <Fill style> [, <Type of hatching> [, <Opacity>]]])
<Image>: Optional control name or optional Image, WDPic or picLayer variable
Reports and QueriesWindows Image to use. The image can correspond to:
  • the name of an Image control.
  • the name of a variable of type Image.
If this parameter is not specified, it is necessary to define the drawing destination with dStartDrawing.
<Color>: Integer or constant
Default background color of different drawings. 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. In this case, the opacity specified in the variable is taken into account.
<Fill style>: Optional integer or Integer constant
Default background fill of different drawings:
BackgroundHatchedBackground filled with hatching.
Corresponds to value 2 for compatibility.
BackgroundSolid
(Default value)
Solid background.
Corresponds to value 0 for compatibility.
BackgroundTransparentTransparent background (<Color> is ignored).
Corresponds to value 1 for compatibility.

<Type of hatching>: Optional integer
Type of background hatching used by default in the different drawings. To use this parameter, the value of <Fill style> must be equal to 2. If the value of <Fill style> is different from 2, <Type of hatching> is ignored. The different types of hatching are:
  • 0: Horizontal hatching
  • 1: Vertical hatching
  • 2: Diagonal hatching at 60%
  • 3: Diagonal hatching at 120%
  • 4 (by default): Criss-crossed hatching
  • 5: Diagonal crossed hatching
<Opacity>: Optional integer
Opacity of color, included between 0 (transparent) and 255 (opaque). An opacity set to 128 is used to blend 50% of the color with the existing color found in the control.
Remarks:
  • This opacity will be taken into account if the drawing was initialized with the dWithOpacity constant (dStartDrawing).
  • If the <Color> parameter corresponds to a variable of type Color, this parameter must not be specified: the opacity specified in the variable will be taken into account.
Remarks

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.
  • 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 / UI classification: Neutral code
Component: wd270pnt.dll
Minimum version required
  • Version 9
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