2.9 Current layer

All user operations work on the current layer. Typically, the application implements a dialog that lets you set the current layer. Please note that an empty drawing has no Layer, nor a current layer.

Important

• Unlike user operations, 4D CAD methods don’t necessarily operate on the current layer, see the section on Parameter passing
• Implementation of a dialog to set the current layer is left to the application developer (for example code see the Layer editor... menu item in the CAD menu of DemoCAD, called through the TAppMenuEvent_I method).

Programming
To create a current layer in an empty drawing, call CADAddLayer and CADSetCurrentLayer.

Methods
CADAddLayer, CADGetCurrentLayer, CADSetCurrentLayer.