isCOBOL Evolve : Appendices : Library Routines : W$BITMAP : WBITMAP-DISPLAY
WBITMAP-DISPLAY
The WBITMAP-DISPLAY function loads an image into memory and then displays it on the screen. The position of the image is expressed in cells. It is not possible to define a custom size or a "zoom level" for the image. By default, the screen cells occupied by the image are filled with the window's background color, unless the WBITMAP-NO-FILL flag is specified.
The bitmap shown by this op-code is not erased if it’s overlapped by another control.
Syntax:
 CALL "W$BITMAP" USING WBITMAP-DISPLAY 
                       name
                       row 
                       column
                       flags
                GIVING bitmapHandle
Parameters:
WBITMAP-DISPLAY
Constant
 
name
PIC X(n)
Specifies the name of a regular disk file containing the image to be displayed.
row
any numeric data item or numeric literal
Specifies the row, measured in window's cells, where the upper-left image corner is positioned. Decimal values are allowed.
column
any numeric data item or numeric literal
Specifies the column, measured in window's cells, where the upper-left image corner is positioned. Decimal values are allowed.
flags
any numeric data item or numeric literal
Its value affects the way the image is displayed. At present it is possible to assign to it the following symbolic value only:
 
WBITMAP-NO-FILL
The screen cells occupied by the image are not filled with the window's background color.
Return code:
bitmapHandle must be declared as PIC S9(9) COMP-4 and provides additional information:
> 0
Receives the handle to the bitmap
-1
Error: file not found or not readable
-2
Error: out of memory loading the bitmap
-3
Error: not a valid bitmap
-4
Error: format not supported