11. FORMWORK

CHAPTER 11 'FORMWORK' 64 4.2 Interventions Undo : Each time you activate the "UNDO" command, you return to a previous state with step 1, cancelling the last command. The 'UNDOcommand is subject to the 'Delete' and 'Transfer' commands. Redo : Reset to pre-Undo state Delete : delete entities from your design (lines, points, plines, plines, blocks, texts, etc.). To delete an entity the layer to which it belongs must be SELECTED. Deletion can be done by selecting individual objects or by selecting a group of objects with the help of a window (see also paragraph II.A.). In this case, the objects which belong entirely within the window will be deleted. After selecting the items to be deleted, with the left mouse button (either individually or in a window), press the right mouse button and the deletion process is completed, In case there are "remnants" of the deleted entities left after the deletion, on our screen we select the "Redraw" command or press the button and they are cleaned. Restoring deleted entities can be done with the "UNDO" command or with the . Trim : to remove parts of entities which are enclosed by some boundaries. Example : Suppose you want to delete the part of line c-c' lying between lines a-a' and b-b' (section 2). 1. You activate the "trim" option. 2. Use the mouse to point to the first cut-off point (line a-a') and then to the second (line b-b'). 3. Cancel by pressing the right mouse button once. 4. Pressing the left mouse button on section 2 of line c-c' deletes it.