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  • Use in prefixed syntax
  • Drawing with management of opacity
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Stored procedures
Indicates that the drawing functions that will be used are intended for an Image variable.
Remark: <Image variable>.StartDrawing initializes all the parameters required to create a drawing for a given element.
Versions 16 and later
Android This function is now available for Android applications.
Universal Windows 10 App This function is now available for Windows Phone applications.
New in version 16
Android This function is now available for Android applications.
Universal Windows 10 App This function is now available for Windows Phone applications.
Android This function is now available for Android applications.
Universal Windows 10 App This function is now available for Windows Phone applications.
Versions 17 and later
iPhone/iPad This function is now available for iPhone/iPad applications.
New in version 17
iPhone/iPad This function is now available for iPhone/iPad applications.
iPhone/iPad This function is now available for iPhone/iPad applications.
Versions 18 and later
Universal Windows 10 App This function is now available in Windows Store apps mode.
New in version 18
Universal Windows 10 App This function is now available in Windows Store apps mode.
Universal Windows 10 App This function is now available in Windows Store apps mode.
Versions 21 and later
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
New in version 21
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Universal Windows 10 App This function is now available in Universal Windows 10 App mode.
Example
MyImage is Image = "Test.gif"
// Start of 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.DrawText(4, 0, "I'm writing in an Image variable!")
IMG_MyDrawing = MyImage
Syntax
<Result> = <Image variable>.StartDrawing([<Options>])
<Result>: Boolean
  • True if the drawing was initialized,
  • False otherwise.
<Image variable>: Image variable
Name of the Image 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.
AndroidUniversal Windows 10 App 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 App This constant is not available.

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

Use in prefixed 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.
AndroidUniversal Windows 10 App

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
Android The management of opacity is now available for the Android applications.
New in version 16
Android The management of opacity is now available for the Android 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.

    Remark: <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 : wd250pnt.dll
Minimum version required
  • Version 24
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