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New WINDEV, WEBDEV, WINDEV Mobile 24 feature!
  • Use in object syntax
  • Characteristics of drawings in the browser
  • Drawing in Browser code
  • Drawing with management of opacity
WINDEV
WindowsLinuxUniversal Windows 10 AppJavaReports and QueriesUser code (UMC)
WEBDEV
WindowsLinuxPHPWEBDEV - Browser code
WINDEV Mobile
AndroidAndroid Widget iPhone/iPadApple WatchUniversal Windows 10 AppWindows Mobile
Others
Stored procedures
Indicates that the drawing functions that will be used are intended for an Image variable.
Note: <Image variable>.StartDrawing initializes all the parameters required to create a drawing for a given element.
Example
MyImage is Image = "Test.gif"
// Start the drawing
ResDrawing = MyImage.StartDrawing()
// Drawings in the variable MyImage
...
// End of drawings in the variable MyImage
IMG_MyDrawing = MyImage
 
MyImage is Image = "Test.gif"
MyImage.StartDrawing()
MyImage.Font("Arial", 12, iNormal, 0)
MyImage.Text(4, 0, "I am writing my text on an actual image!")
IMG_MyDrawing = MyImage
 
Syntax
<Result> = StartDrawing(<Image> [, <Options>])
<Result>: Boolean
  • True if the drawing was initialized,
  • False otherwise.
<Image>: Image variable
Name of an Image variable.
<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.
AndroidUniversal Windows 10 AppJava This constant is not available.
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.
AndroidUniversal Windows 10 AppJava This constant is not available.
No drawing option is used if this parameter is not specified.
Remarks

Use in object syntax

<Image variable>.StartDrawing must be called before the other drawing functions. <Image variable>.StartDrawing makes it possible to define the drawing options used on the Image variable.
WINDEVWEBDEV - Server codeReports and QueriesAndroidUniversal Windows 10 AppJavaAjaxUser 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.
Versions 16 and later
Java The management of opacity is now available for the Java applications.
Android The management of opacity is now available for the Android applications.
New in version 16
Java The management of opacity is now available for the Java applications.
Android The management of opacity is now available for the Android applications.
Java The management of opacity is now available for the Java applications.
Android The management of opacity is now available for the Android applications.
To save a PNG drawing with management of Alpha layer:
  1. Use <Image 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:
    <Image variable>.BackgroundDeclares the background color and its opacity for the next drawings.
    <Image variable>.DrawPointDeclares the color of the points and their opacity for the next drawings.
    <Image variable>.PenDeclares the color of the lines and their opacity for the next drawings.

    Note: <Image variable>.PixelOpacity is used to find out the opacity of a point.
  3. Use <Image variable>.SavePNG to save your drawing in PNG format with management of alpha layer (opacity).
Limit: In "Management of opacity" mode, <Image 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 : wd240pnt.dll
Minimum version required
  • Version 24
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