Use this function to set a graphical area to refresh on lcd. If a function call concerning graphical output doesnt sets a refresh area itself, you should call this function before to set the correct refresh area. The syntax is a follows:

%LCD.Gfx_SetRefreshArea(x1,y1,x2,y2)

x1,y1 = upper left point of refresh area rectangle
x2,y2 = lower right point of refresh area rectangle

Example:

%LCD.Gfx_SetRefreshArea(10,10,100,20)

This function sets a refresh area rectangle. The application refreshes the graphical output from x-position 10px to 100px and y-position 10px to 20px.