Special cases Characteristics of drawings in the browser Drawing in Browser code Drawing with opacity dStartDrawing, zoom and automatic scrollbars Drawing in PHP
dStartDrawing (Function)
In french: dDébutDessin
ResDessin = dStartDrawing ( IMG_ImageDessin )
...
dStartDrawing ( IMG_Image1 )
dFont ( "Arial" , 12 , iNormal , 0 )
dText ( 4 , 0 , "J'écris mon texte dans un champ Image !" )
Syntax
Starting a drawing in an Image control Hide the details
<Result> = dStartDrawing(<Image control> [, <Options>])
<Result>: System integer
Memory DC (device context) of the Image control, 0 if an error occurs. This parameter can be used to call system routines (functions of Windows API). In this case, we recommend that you use a system integer. <Image control>: Control name
Name of Image control where the drawing will be performed. <Options>: Optional Integer constant (or combination of constants)
Drawing options:dDisplayAsynchronous dDisplayManual dErase (Default value)Erases the drawing found in the Image control. dGridlinesOpacity The drawing is displayed over gridlines in order to highlight the transparent or semi-transparent sections of the drawing. The gridlines are not saved in the image. dNoErase Does not erase the drawing found in the Image control. dOnChart Used to draw in an Image control in which a chart was already drawn. In this case, the chart drawing is not erased. dWithOpacity Allows the opacity to be managed in the different drawing functions used by the Image control. Used for example to create a PNG drawing with an Alpha channel.
Remarks
Special cases
dStartDrawing must be called before the other drawing functions. dStartDrawing is used to define the element (Image control or Image variable) onto which the drawing functions will be applied.When drawing in an Image control: the drawing functions operate on a copy ("bitmap") of image. You can use the drawing functions of Windows (via API or CallDLL32 ) but these Windows 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 processing as function dStartDrawing function, the drawing will not appear: it will be automatically 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
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