2 Visual Components Manuals

Introduction to Visual Components 2.3
3.3.8.27 Setting the Palette Color − VA_SetPaletteColor
It is possible to dynamically change color values for each individual color using the VA_SetPaletteColor function.
Naturally, this is only possible on an IPC (color or black/white display).
If a palette color is changed, it will remain so until it is either changed again or a warm/cold restart is executed.
3.3.8.27.1 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.
IN index UINT Index of the color which should be changed (0−255).
IN color UDINT
New color. The color value is arranged as follows:
Bits 00 − 80 Red value (0−255)
Bits 08 − 16 Green value (0−255)
Bits 16 − 24 Blue value (0−255)
Bits 24 − 32 0
OUT Return Value UINT Not equal to 0 if error occurs
3.3.8.27.2 Example for Automation Basic
(* cyclic program *)
if ready 1 then
VC_HANDLE = VA_Setup(1 "vga") ,
if VC_HANDLE 0 then
ready = 1
endif
endif
if ready = 1 then
if VA_Saccess(1,VC_HANDLE)= 0 then
color = (255 OR SHL(255,8) OR SHL(255,16))
VA_SetPaletteColor(1,VC_HANDLE,color_index, color)
VA_Srelease(1,VC_HANDLE)
endif
endif
3.3.8.27.3 Example for C Programming
#include
#include
#include
UINT _GLOBAL ready;
UINT _GLOBAL color_index
UDINT _GLOBAL color;
unsigned long VC_HANDLE;
_CYCLIC void Cyclic(void)
{
if (!ready)
{
VC_HANDLE = VA_Setup(1 "vga"); ,
if (VC_HANDLE)
ready = 1;
}
if (ready)
{
if (!VA_Saccess(1,VC_HANDLE))
{
color = (0xFF | (0xFF