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  • Use in prefix syntax
  • Drawing with management of opacity
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Stored procedures
Indicates that the drawing functions that will be used are intended for a WDPic variable.
Remark: <WDPic variable>.StartDrawing initializes all the parameters required to create a drawing for a given element.
Example
MonWDPic est un WDPic = "Test.gif"
// Début du dessin
ResDessin = MonWDPic.DébutDessin()
// Dessins dans la variable MonWDPic
...
// Fin des dessins dans la variable MonWDPic
IMG_MonDessin = MonWDPic
MonWDPic est un WDPic = "Test.gif"
MonWDPic.DébutDessin()
MonWDPic.Police("Arial", 12, iNormal, 0)
MonWDPic.DessineTexte(4, 0, "J'écris mon texte dans une variable WDPic!")
IMG_MonDessin = MonWDPic
<Result> = <WDPic image>.StartDrawing([<Options>])
<Result>: Boolean
  • True if the drawing was initialized,
  • False otherwise.
<WDPic image>: WDPic variable
Name of the variable of type WDPic to be used. Only the background layer will be handled.
<Options>: Optional Integer constant (or combination of constants)
Drawing options:
dWithOpacityAllows managing opacity in the different drawing functions used with the variable. Used for example to create a drawing saved in PNG format with management of alpha layer.
dGridlinesOpacityThe drawing is displayed over gridlines in order to highlight the transparent or semi-transparent sections of drawing. The gridlines are not saved in the image.
dNoEraseDoes not erase the drawing in the variable.
dOnChartUsed to draw in a variable in which a chart has already been drawn. In this case, the chart drawing is not erased.

No drawing option is used if this parameter is not specified.
Remarks

Use in prefix syntax

<WDPic variable>.StartDrawing must be called before the other drawing functions. <WDPic variable>.StartDrawing makes it possible to define the drawing options used on the WDPic variable.
Reports and Queries

Drawing with management of opacity

Creating a drawing with management of opacity is used to easily save the images in PNG format with management of Alpha layer.
To save a PNG drawing with management of Alpha layer:
  1. Use <WDPic variable>.StartDrawing. This function is used to define, if necessary, the element onto which the drawing functions will be applied as well as the drawing mode. The dWithOpacity constant is used to indicate that the drawing will manage the opacity. The dGridlinesOpacity constant is used to display gridlines underneath the different drawing areas.
  2. Configure the opacity of your drawings with the following functions:
    <WDPic variable>.BackgroundDeclares the background color and its opacity for the next drawings.
    <WDPic variable>.DrawPointDeclares the color of the points and their opacity for the next drawings.
    <WDPic variable>.PenDeclares the color of the lines and their opacity for the next drawings.

    Remark: <WDPic variable>.PixelOpacity is used to find out the opacity of a point.
  3. Use dSaveImagePNG to save your drawing in PNG format with management of alpha layer (opacity).
Limit: In "Management of opacity" mode, <WDPic variable>.DrawText is limited to the use of True Type fonts.
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
Component: wd270pnt.dll
Minimum version required
  • Version 25
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