func (a *Arch) addExternalPort(c pf.ChannelIf, mode gr.PositionMode, idx int) {
config := DrawConfig{ColorInit(ColorOption(NormalArchPort)),
ColorInit(ColorOption(HighlightArchPort)),
ColorInit(ColorOption(SelectArchPort)),
ColorInit(ColorOption(BoxFrame)),
Color{},
image.Point{}}
ap := c.ArchPort()
if ap == nil {
log.Printf("Arch.addExternalPort error: channel %v has no arch port\n", c)
return
}
positioner := gr.ModePositionerProxyNew(ap, mode)
a.AddPort(config, ap, positioner)
}
