BASE_SCREEN class implementation.
Handles how to draw a screen (a board, a schematic ...)
PCB_LAYER_ID m_Route_Layer_TOP
PCB_LAYER_ID m_Route_Layer_BOTTOM
PCB_LAYER_ID m_Active_Layer
PCB_SCREEN(const wxSize &aPageSizeIU)
PCB_LAYER_ID
A quick note on layer IDs: