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  • Zoom on an image
  • Drawing in PHP
  • Drawing in Browser code
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Stored procedures
Warning
From version 18, this function is kept for backward compatibility for most of the platforms. It is recommended to use dCopy. Indeed:
  • dCopy manages transparency,
  • the different copy modes of dCopyBlt are replaced with:
Copies an image:
  • from an Image control to another Image control.
  • in a variable of type Image.
    WEBDEV - Browser codePHP This type of variable is not available.
AndroidJava Only the first syntax can be used with the Image type.
Example
// Simple copy of content from the "IMG_ImageDrawing" control
// into the "IMG_ImageCopy" Image control
ResCopy = dCopyBlt(IMG_ImageDrawing, IMG_ImageCopy)
WINDEVReports and QueriesUser code (UMC)
// Copy the image of the screen into an Image control
dCopyBlt(copyScreen, IMG_MyImage)
Syntax

Copying images from Image controls Hide the details

<Result> = dCopyBlt(<Source image control> , <Destination Image control> [, <Copy mode> [, <Source image X-coordinate> [, <Source image Y-coordinate> [, <Source image height> [, <Source image width> [, <Destination image X-coordinate> [, <Destination image Y-coordinate> [, <Destination image height> [, <Destination image width>]]]]]]]]])
<Result>: Boolean
  • True if the image was copied,
  • False otherwise.
Remark: dCopyBlt can return False if the screen driver does not support this function. In this case, a message is displayed in the copied image. We recommend that you update your screen driver in order to get the proper behavior.
<Source image control>: Control name
Name of the source Image control to be used.
To take a screenshot, use the copyScreen constant: the entire screen content is copied.
WEBDEV - Server codeWEBDEV - Browser code The copyScreen constant is not available. The image to copy must necessarily be found in an Image control and it must be a generated image.
Universal Windows 10 AppAndroid The copyScreen constant is not available.
AndroidJava This parameter can correspond to:
  • the name of an Image control,
  • the name of a variable of type Image.
<Destination Image control>: Control name
Name of the destination Image control the image will be copied to.
AndroidJava This parameter can correspond to:
  • the name of an Image control,
  • the name of a variable of type Image.
WEBDEV - Server codeWEBDEV - Browser code The destination Image control must contain a generated image.
<Copy mode>: Optional constant
Copy mode to be used.
copyBlacknessFills the destination Image control with black.
Universal Windows 10 AppAndroidJava This constant is not available.
copyDstInvertInverts the colors of the destination Image control.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyImageCombines the source image with the destination image using the transparency information of the destination image
Can be used to include a logo in the destination image for example.
Remark: The size and position in the source are ignored. No homothety and no zoom are allowed in this mode.
Universal Windows 10 AppiPhone/iPadIOS WidgetMac Catalyst This constant is not available.
copyMergeCopyMerges the source Image control and the destination Image control.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyMergePaintCombines the source Image control with the "pattern" of the destination Image control via the "Logical AND" method.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyNotSrcCopyInverts the colors of the source Image control.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyNotSrcEraseInverts the combination between the source and the destination Image controls via the "OR" method.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyPatCopyCopies the "pattern" from the source Image control to the destination Image control.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyPatInvertCombines the pattern of the source and destination Image controls via the "XOR" (Exclusive Or) method. The current brush, defined by dBackground, is used.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyPatPaintCombines the inverted source Image control with the "pattern" of the destination Image control via the "OR" method.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copySrcAndCombines the pixels of the source and destination Image controls via the "AND" method.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copySrcCopy
(Default value)
Copies the source Image control to the destination Image control (simple copy).
copySrcEraseInverts the destination Image control and combines the result with the copy of the source Image control.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copySrcInvertCombines the pixels of the source and destination Image controls via the "XOR" (Exclusive Or) method.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copySrcPaintCombines the pixels of the source and destination Image controls via the "OR" method.
Universal Windows 10 AppAndroidiPhone/iPadIOS WidgetMac CatalystJava This constant is not available.
copyWhitenessFills the destination Image control with white.
Universal Windows 10 AppAndroidJava This constant is not available.
<Source image X-coordinate>: Optional integer
X-coordinate (in pixels) of the upper-left corner of the area to copy (upper-left corner of the source Image control by default).
<Source image Y-coordinate>: Optional integer
Y-coordinate (in pixels) of the upper-left corner of the area to copy (upper-left corner of the source Image control by default).
<Source image height>: Optional integer
Height (in pixels) of the area to copy (height of the source Image control by default).
<Source image width>: Optional integer
Width (in pixels) of the area to copy (width of the source Image control by default).
<Destination image X-coordinate>: Optional integer
X-coordinate (in pixels) of the upper-left corner of the copy destination area (upper-left corner of the destination Image control by default).
<Destination image Y-coordinate>: Optional integer
Y-coordinate (in pixels) of the upper-left corner of the copy destination area (upper-left corner of the destination Image control by default).
<Destination image height>: Optional integer
Height (in pixels) of the area the image will be copied to (height of the destination Image control by default). If this height is greater than the height of the source image, the image will be enlarged when copied.
<Destination image width>: Optional integer
Width (in pixels) of the area the image will be copied to (width of the destination Image control by default). If this width is greater than the width of the source image, the image will be enlarged when copied.
WINDEVWEBDEV - Server codeReports and QueriesUniversal Windows 10 AppiPhone/iPadIOS WidgetMac CatalystUser code (UMC)

Copying the images found in the Image variables Hide the details

<Result> = dCopyBlt(<Source image name> , <Destination image name> [, <Source image X-coordinate> [, <Source image Y-coordinate> [, <Source image height> [, <Source image width> [, <Destination image X-coordinate> [, <Destination image Y-coordinate> [, <Destination image height> [, <Destination image width>]]]]]]]])
<Result>: Boolean
  • True if the image was copied,
  • False otherwise.
Remark: dCopyBlt can return False if the screen driver does not support this function. In this case, a message is displayed in the copied image. We recommend that you update your screen driver in order to get the proper behavior.
<Source image name>: Image variable
Name of the Image variable to be used. This image is the source image.
<Destination image name>: Image variable
Name of the Image variable the image will be copied to.
<Source image X-coordinate>: Optional integer
X-coordinate (in pixels) of the upper-left corner of the area to copy (upper-left corner of the source image by default).
<Source image Y-coordinate>: Optional integer
Y-coordinate (in pixels) of the upper-left corner of the area to copy (upper-left corner of the source image by default).
<Source image height>: Optional integer
Height (in pixels) of the area to copy (height of the source image by default).
<Source image width>: Optional integer
Width (in pixels) of the area to copy (width of the source image by default).
<Destination image X-coordinate>: Optional integer
X-coordinate (in pixels) of the upper-left corner of the copy destination area (upper-left corner of the destination image by default).
<Destination image Y-coordinate>: Optional integer
Y-coordinate (in pixels) of the upper-left corner of the copy destination area (upper-left corner of the destination image by default).
<Destination image height>: Optional integer
Height (in pixels) of the area the image will be copied to (height of the destination image by default). If this height is greater than the height of the source image, the image will be enlarged when copied.
<Destination image width>: Optional integer
Width (in pixels) of the area the image will be copied to (width of the destination image by default). If this width is greater than the width of the source image, the image will be enlarged when copied.
Remarks

Zoom on an image

During a copy, you can enlarge or reduce a section of the source image when copying it to the destination image. To do so:
  • Define the area to enlarge (or reduce) in the source image (with the <Source image X-coordinate>, <Source image Y-coordinate>, <Source image height> and <Source image width> parameters),
  • Define the display area of the result image. This area must be larger to enlarge the image and smaller to reduce the image. By default, the entire destination image is taken into account. Use <Destination image X-coordinate>, <Destination image Y-coordinate>, <Destination image height> and <Destination image width> if necessary.
The zoom percentage depends on the multiplying coefficient between the dimensions of the two areas.
For example:
1. The area to zoom is included in a rectangle whose width is et to 30 pixels and whose height is set to 40 pixels.2. To perform a 200% zoom, the destination area must be twice the size of the source area: rectangle whose width is set to 60 pixels and whose height is set to 80 pixels.
area to zoom in
zoomed area
In this case, the following line of code is used to perform the zoom operation during the copy:
dCopyBlt(IMG_SourceControl, IMG_DestinationControl, copySrcCopy, 10, 10, 30, 40, 10, 10, 60, 80)
PHP

Drawing in PHP

In PHP, the drawing functions are based on the graphic library GD. This library is commonly used by the PHP hosting companies and therefore it is always enabled. The version of the GD library must be version 2.0.28 (or later). This library can be downloaded from the PHP site.
To enable (if necessary) this library locally, the following elements are required:
  • PHP installed.
  • the PHP.INI file found in the Windows directory must contain the following line: "extension=php_gd2.dll" (instead of ";extension=php_gd2.dll").
  • the php_gd2.dll file must exist in the directory of PHP extensions. This directory is defined in the PHP.INI file by the "extension_dir" variable.
WEBDEV - Browser code

Drawing in Browser code

Some drawing functions are available in Browser code. The drawing functions in Browser code are based on the HTML 5 standard. More specifically, these functions are based on the "canvas" tag of HTML 5.
The drawing features in browser code are available for the recent browsers only (supporting the HTML 5 standard). To find out whether the drawing features are proposed by your browser, use DrawingAvailable.
Caution: To use the drawing functions with Internet Explorer 9, the project must include the reference to the DTD file. To do so, the HTML mode must be "HTML 4.01 Transitional + DTD". This option is available in the "Advanced" tab of the description window of project.
Reminder: To open the project description window, go to the "Project" tab, "Project" group and click "Description".
Special case: Drawing in the browser of an Android phone: The browser drawing functions are only available starting with version 3 of Android.
Component: wd270obj.dll
Minimum version required
  • Version 9
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