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New WINDEV, WEBDEV 25 feature!
  • Use in prefixed syntax
  • Characteristics of drawings in the browser
  • Drawing in Browser code
  • Drawing with management of opacity
  • Drawing in PHP
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Stored procedures
Indicates that the drawing functions that will be used are intended for an picLayer variable.
Remark: <picLayer variable>.StartDrawing initializes all the parameters required to create a drawing for a given element.
Versions 15 and later
WEBDEV - Server code This function is now available for WEBDEV sites in Linux.
New in version 15
WEBDEV - Server code This function is now available for WEBDEV sites in Linux.
WEBDEV - Server code This function is now available for WEBDEV sites in Linux.
Example
MyImage is WDPic = "Test.gif"
MyLayer is picLayer
// Start drawing in the layer
ResDrawing = MyLayer.StartDrawing()
// Drawings in MyLayer
...
// End of drawings in MyLayer
IMG_MyDrawing = MyImage
MyWDPic is WDPic = "Test.gif"
MyLayer is picLayer
 
MyLayer.StartDrawing()
MyLayer.Font("Arial", 12, iNormal, 0)
MyLayer.DrawText(4, 0, "I'm writing in a picLayer variable!")
IMG_MyDrawing = MyWDPic
WINDEVWEBDEV - Server codeReports and QueriesUser code (UMC)
<Result> = <picLayer image>.StartDrawing([<Options>])
<Result>: Boolean
  • True if the drawing was initialized,
  • False otherwise.
<picLayer image>: picLayer variable
Name of the picLayer variable to use.
<Options>: Optional Integer constant (or combination of constants)
Drawing options:
dWithOpacityAllows the opacity to be managed in the different drawing functions used by the Image variable. Used for example to create a drawing saved in PNG format with management of alpha layer.
dGridlinesOpacityThe drawing is displayed on a gridline 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 found in the Image variable.
dOnChartUsed to draw in an Image variable in which a chart was already drawn. In this case, the chart drawing is not erased.

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

Use in prefixed syntax

<picLayer variable>.StartDrawing must be called before the other drawing functions. <picLayer variable>.StartDrawing makes it possible to define the drawing options used on the picLayer variable.
WINDEVWEBDEV - Server codeReports and QueriesAjaxUser code (UMC)

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 <picLayer 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:
    <picLayer variable>.BackgroundDeclares the background color and its opacity for the next drawings.
    <Variable picCalque>.DessinePointDeclares the color of the points and their opacity for the next drawings.
    <Image>.PenDeclares the color of the lines and their opacity for the next drawings.

    Remark: <Variable picCalque>.PixelOpacité is used to find out the opacity of a point.
  3. Use <Image>.SavePNG to save your drawing in PNG format with management of alpha layer (opacity).
Limit: In "Management of opacity" mode, <Variable picCalque>.DessineTexte 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 : wd250pnt.dll
Minimum version required
  • Version 25
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