Introduction to Polylines

1. Introduction to Polylines Engineering Design Technology Sacramento City College Introduction to Polylines

2. Polylines Introduction to Polylines

3. Polylines • The term polyline is composed of the words "poly" and "line." • Poly means many. Introduction to Polylines

4. Polylines • A polyline is • A single object that can be • Made up of one or more varied-width line segments. Introduction to Polylines

5. The PLINE Command Introduction to Polylines

6. Polylines • Polylines are drawn with the PLINE command. • The TRACE command, is similar to the PLINE command. • Both commands can be used to draw thick lines. • PLINE has numerous advantages over TRACE Introduction to Polylines

7. Polylines • Polylines advantages over normal lines: • 1. Polylines can be drawn as thick or tapered lines. • 2. Polylines are more flexible than lines drawn with the TRACE command. • 3. Polylines can be any linetype. Introduction to Polylines

8. Polylines • 4. Polylines can be edited. • 5. Closed polygons can be drawn. • 6. The area or perimeter of a polyline object can be determined easily. • 7. Arcs and straight lines of varying thickness can be joined as single objects. Introduction to Polylines

9. Polylines • The PLINE command is similar to the LINE command. • But • All segments of a polyline are treated as a single object. • Lines drawn with the LINE command, are individual segments. Introduction to Polylines

10. Polylines • To draw a polyline, • Pick the Polyline button from the Draw toolbar • OR • Pick Polyline from the Drawpull-down menu • OR • Type PL or PLINE at the Command: prompt: Introduction to Polylines

11. Polylines • Command: PL or PLINE • Specify start point: (select a point) • Current line-width is 0.0000 • Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]: (select the next point) • Press [Enter] to end the PLINE command and return to the Command: prompt. Introduction to Polylines

12. Polylines • A line width of 0.0000 produces a line of minimum width. Introduction to Polylines

13. Setting the Polyline Width • To adjust the Width of a PLINE • Use the Width optionafter you enter the PLINE command to change the line width, and • have selected the first point of the PLINE. Introduction to Polylines

14. Polyline Options Introduction to Polylines

15. Polyline Options • Polyline Options • Width • Halfwidth • Length • Undo Introduction to Polylines

16. Setting the Polyline Width • Width option • Specify the starting and ending widths of the line. • The starting width value that you specify becomes the default setting for the endingwidth. • To keep the line the same width, press [Enter] at the second prompt. Introduction to Polylines

17. Setting the Polyline Width • If a tapered line is desired, enter different values for the starting and ending widths. Starting Width = 0.0000 Ending Width = 1.0000 Introduction to Polylines

18. Halfwidth Option • Halfwidth option • Allows you to specify the width of the polyline from the center to one side. Introduction to Polylines

19. Length Option • Length option • Not intuitive • Allows you to draw another polyline having the same angle as the previous polyline. • To use: After drawing a polyline: • Reissue the PLINE command • Pick a starting point. • Enter the Length option • Give the desired length. • The 2nd PLINE will be parallel to the first PLINE. Introduction to Polylines

20. Undoing Previously Drawn Polylines • Undo option • Use while inside the PLINE command • Erases the last polyline segment drawn. • Enter U at the prompt line and then press [Enter] • Each time you use the Undo option, another polyline segment is erased. Introduction to Polylines

21. Undoing Previously Drawn Polylines • The cursor remains attached to the end of the polyline segment that was drawn before the undone segment. • You can now continue to draw additional polyline segments • OR • Type U and press [Enter] again to undoanothersegment. Introduction to Polylines

22. Undoing Previously Drawn Polylines • Undo Option • You can use the Undo option to remove all of the polyline segments up to the first point of the polyline. • The segments are removed in reverse order (from the order in which they were drawn). Introduction to Polylines

23. The U Command Introduction to Polylines

24. The U Command • The U command works in much the same way. • The U Command is not the Undo option of the PLINE command. • The U command can be used to undo any previous commands. Introduction to Polylines

25. The U Command • To execute the U command: • Pick the Undo button from the Standardtoolbar • OR • Pick Undo from the Editpull-down menu • OR • Pressing the [Ctrl]+[Z] key combination • OR • Enter U at the Command: prompt. Introduction to Polylines

26. The U Command • The U command can also be activated by: • Right-clicking in the drawing area. • Selecting Undo from the shortcut menu. • AutoCAD gives you a message indicating which command was undone: • Command: U • PLINE • Command: Introduction to Polylines

27. The U Command • You can only undo one command at a time. • Repeated UNDO’s can be executed. • The UNDO command, • Has more options than the U command • Is more versatile than the U command. Introduction to Polylines

28. The REDO Command Introduction to Polylines

29. The REDO Command • The REDO command • is used to bring back objects that were erased with the UNDO and U commands. Introduction to Polylines

30. The REDO Command • Enter REDO at the Command: prompt • OR • Pick Redo from the Edit pull-down menu • OR • Press the [Ctrl]+[Y] key combination • OR • Pick the Redo button from the Standard toolbar to activate the command. Introduction to Polylines

31. The UNDO Mark • The REDO command works only immediately after undoing something. • REDO does not bring back polyline segments that were removed using the Undo option of the PLINE command. Introduction to Polylines

32. Filling Polylines and TracesThe FILL Command Introduction to Polylines

33. The FILL Command • Traces and polylines can be • Filled in, or • Shown as an outline. • These functions are controlled by the FILL command. • The FILL command has two modes, ON and OFF. Introduction to Polylines

34. The FILL Command • Command: FILL • Enter mode [ON/OFF] <current>: • When the FILL is on, traces and polylines appear filled after they are drawn. • When FILL is off, traces and polylines appear as outlines, and the corners are mitered. Introduction to Polylines

35. The FILL Command • After turning FILL off, REGEN to have the fill removed. Introduction to Polylines

36. The FILL Command • FILL on • May slow down your computer. • If you have many wide polylines or traces in a drawing, keep FILL mode turned off. • This saves time when redrawing, regenerating, or plotting a check copy of the drawing. Introduction to Polylines

37. The UNDO Command Introduction to Polylines

38. The UNDO Command • The UNDO command is different from the U command. • The UNDO command offers several options that allow you to undo a single command or a number of commands at once. Introduction to Polylines

39. The UNDO Command • The command sequence is as follows: • Command: UNDO • Enter the number of operations to undo or [Auto/Control/BEgin/End/Mark/Back]: Introduction to Polylines

40. The UNDO Command • The default option allows you to designate the number of previous command sequences you wish to remove. • If you enter 1, the previous command sequence is removed. • If you enter 2, the previous two command sequences are removed. • AutoCAD tells you which commands were undone with a message after you press [Enter]. Introduction to Polylines

41. The UNDO Command • Command: UNDO • Enter the number of operations to undo or [Auto/Control/BEgin/End/Mark/Back]: 2 • PLINE LINE • Command: Introduction to Polylines

42. The UNDO Command • There are several other types of undo operations that can be performed with the UNDO command. Introduction to Polylines

43. The UNDO Command - Auto Option • The Autooption can be turned on or off. • When Auto option is on, any commands that are part of a group and used to perform a single operation are removed together. • When a command contains other commands, all of the commands in that group are removed as one single command. • The Auto option is on by default. Introduction to Polylines

44. The UNDO Command - Auto Option • If Auto is turned off, each command in a group of commands is treated individually. Introduction to Polylines

45. The UNDO Command - Control Option • The Control option allows you to specify how many of the UNDO command options you want active. • You can even disable the UNDO command altogether. Introduction to Polylines

46. The UNDO Command - Control Option • To use the Controloption: • Enter C after issuing the UNDO command: • Enter the number of operations to undo or [Auto/Control/BEgin/End/Mark/Back]: C • Enter an UNDO control option [All/None/One] <All>: (enter a control option and press [Enter]) Introduction to Polylines

47. The UNDO Command - All Option • The All suboption keeps the full range of UNDO command options active. • All is the default setting. Introduction to Polylines

48. The UNDO Command - None Option • The None suboption disables the U and UNDO commands. • When disabled, and the U command is entered, the following prompt appears: • Command: U • U command disabled. Use UNDO command to turn it on • This prompt indicates how to reactivate the U and UNDO commands. Introduction to Polylines

49. The UNDO Command - Auto Option • If you type UNDO at the Command: prompt, the following appears: • Command: UNDO • Enter an UNDO control option [All/None/One] <All>: • To activate the UNDO options, press [Enter] for All. Introduction to Polylines

50. The UNDO Command - One Option • Enter 0 for the One suboption. • This setting limits UNDO to one operation only. • Command: UNDO • Control/<l>: -i • LINE • Everything has been undone Command: Introduction to Polylines