VI10BeginDrawBuffer
V = Vector
I = Image
Function that is used to manage the Vector Image feature (object that resides on some versions of Qpaint).
The VI10BeginDrawBuffer function has the task of preparing the buffer to next add paint operations. The function also checks for errors and then places them in the variable given as the second argument.
Before you start building the buffer content, if you want to start a new drawing, you must call this function or function VI10InitBuffer.
IMPLEMENTATION
VI10BeginDrawBuffer (awBuffer, gwError)
Parameters:
| IN/OUT | VARIABLE TYPE | EXAMPLE NAME | DIM | |
|---|---|---|---|---|
| IN | ARRSYS / ARRGBL | awBuffer | W | Array that serves as a buffer for instructions/data |
| OUT | SYSTEM / GLOBAL | gwError | W | Error variable |
Example
TASK_00
MAIN:
IF gfDraw
VI11WaitBufferReadyUsingWAIT(awBuffer)
VI10BeginDrawBuffer(awBuffer, gwError)
IF gwError
; Error report
ELSE
...
VI10DrawBuffer(awBuffer)
ENDIF
gfDraw = 0
ENDIF
END
Note
In case the error variable already has a value other than zero, it will not be overwritten.