2 Visual Components Manuals

3.3.8.20.3 Example for C Programming
#include
#include
#include
UINT _GLOBAL ready;
unsigned long VC_HANDLE;
UINT _GLOBAL x1;
UINT _GLOBAL x2;
UINT _GLOBAL y1;
UINT _GLOBAL y2;
UINT _GLOBAL fill;
UINT _GLOBAL color;
_CYCLIC void Cyclic(void)
{
x1 = 150;
y1 = 100;
x2 = 100;
y2 = 150;
fill = /* 255; Transparent */
color /* = 0; Black */
if (!ready)
{
VC_HANDLE = VA_Setup(1 "vga"); ,
if (VC_HANDLE)
ready = 1;
}
if (ready)
{
if (!VA_Saccess(1,VC_HANDLE))
{
VA_Rect (1,VC_HANDLE,x1,y1,x2,y2,fill,color);
VA_Srelease(1,VC_HANDLE);
}
}
}
3.3.8.21 Graphics and Text Output − VA_Redraw
The VA_Redraw function clears all VISAPI output and
then redraws the picture.
3.3.8.21.1 Parameter
I/O Parameter Type Meaning
IN enable BOOL This function is only executed if enable is TRUE.
IN VCHandle UDINT The handle returned by VA_Setup
OUT Return Value UINT Not equal to 0 if error occurs
Warning:
This function works asynchronously. This means that in some circumstances, subsequent Visapi functions (i.e.
VA_Rect, etc.) are not drawn.
In this case, the subsequent functions have already been executed before the VA_Redraw function is finished.
If the VA_Redraw function now finishes (afterward), then all drawing functions which had been carried out after
this function was called are erased.
3.3.8.21.2 Example for Automation Basic
(* cyclic program *)
if ready 1 then
VC_HANDLE = VA_Setup(1 "vga") ,
VC_HANDLE if 0 then
ready = 1
endif
Introduction to Visual Components 2.3
156 3.3.8.20 Graphics and Text Output − VA_Rect