func LineStipple(factor int32, pattern uint16) {
	syscall.Syscall(gpLineStipple, 2, uintptr(factor), uintptr(pattern), 0)
}
func LineStipple(factor int32, pattern uint16) {
	syscall.Syscall(gpLineStipple, 2, uintptr(factor), uintptr(pattern), 0)
}
func LineStipple ( factor int32 , pattern uint16 ) { syscall . Syscall ( gpLineStipple , 2 , uintptr ( factor ) , uintptr ( pattern ) , 0 ) }
// specify the line stipple pattern
specify the line stipple pattern