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Mastering Polylines and Splines in Drawing

Learn to draw, edit polylines, arcs, and splines in AutoCAD with the PLINE command and PEDIT options. Discover techniques for creating polyline boundaries and continuous arcs effortlessly.

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Mastering Polylines and Splines in Drawing

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  1. Drawing and Editing Polylines and SplinesChapter 16 Sacramento City College EDT 310 EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  2. Objectives • Use the PLINE command to draw polylines and polyarcs. • Edit existing polylines with the PEDIT command. • Describe the function of each PEDIT command option. • Use the EXPLODE command to change polylines into individual line and arc segments. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  3. Objectives • Draw and edit spline curves. • Create a polyline boundary. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  4. The PLINE Command EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  5. PLINE Command • The PLINE command can be accessed by: • Picking the Polyline button in the Drawtoolbar • OR • Selecting Polyline from the Drawpull-down menu • OR • Type PL or PLINE at the Command: prompt. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  6. PLINE Command - The Arc option EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  7. PLINE Command • The Arc option of the PLINE command • Is similar to the ARC command • The PLINE Width and Halfwidth options can be used to set an arc width. • The arc width can range from 0 up to the radius of the arc. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  8. PLINE Command • A polyline arc with different end widths is drawn by • accessing the Width option and • changing the width values. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  9. Drawing a Continuous Polyline Arc • A polyline arccontinued from a previous line or polyline is tangent to the last object drawn. • The arc's center is determined automatically • You can pick a new center. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  10. Drawing a Continuous Polyline Arc • If a straight polyline is continued from a polyline arc, the arc's tangent direction remains the same as that of the previous line, arc, or polyline. • This may not be what you want. • Specify a different setting with one of the PLINEArcoptions. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  11. Drawing a Continuous Polyline Arc • Arc Options: • Angle • Center • Close • Direction • Radius • Second pt (second point). EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  12. Specifying the Included Angle • Angle option • You can specify the angle for a PLINE arc by using the Angle option. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  13. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  14. Specifying the Included Angle • Center option • When a polyline arc is continued from a drawn object, the center point is calculated automatically. • You can to pick a new center point. • The CEnter option allows you to specify a new center point for the arc. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  15. Specifying the Included Angle • If A is entered, the next prompt is: • Specify included angle: (enter an included angle and press [Enter]) • If L is entered, the next prompt is: • Specify length of chord: (enter a chord length and press [Enter]) EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  16. The Direction Option • The Direction option • changes the bearing of the arc. • It changes the default option of placing a polyline arc tangent to the last polyline, arc, or line. • The Directionoption functions much like the Direction option of the ARC command. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  17. Drawing a Polyline Arc by Radius • Radius Option • Polyline arcs can be drawn by giving the arc's radius. • Enter the Radiusoption inside the PLINE Arc command. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  18. Three-Point Polyline Arc EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  19. Three-Point Polyline Arc • A three-point polyline arc can be drawn by using the Second pt option. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  20. Three-Point Polyline Arc • The CLose option • adds the last segment to close a polygonal shape. • Used inside the PLINE Arc command sequence closes the shape with a polyline arc segment, rather than a straight polyline. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  21. Three-Point Polyline Arc • Two letters are required • CL = CLose • CE = CEnter option. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  22. Presetting Polyline WidthsThe PLINEWID System Variable EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  23. Presetting Polyline Widths • The PLINEWID system variable • Sets the constant width for polylines. • To change a PLINE width • Enter PLINEWID at the Command: prompt and • enter a new value. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  24. Presetting Polyline Widths • Polygons • are NOT affected by the PLINEWID system variable. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  25. Editing Polylines EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  26. Editing Polylines • Polylines are drawn as single segments. • Even though you draw connecting segments, AutoCAD puts them all together. • The result is one polyline treated as a single object. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  27. Editing Polylines • When editing a polyline, you must • Edit it as one object • OR • Divide it into its individual segments. • This method destroys the PLINE (!) • Not recommended. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  28. Editing Polylines • The PEDIT (PE) command is accessed by: • Picking the Edit Polyline button from the Modify II toolbar • OR • By typing PE or PEDIT at the Command: prompt, • OR • By selecting Polyline from the Modify pull-down menu. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  29. Editing Polylines • PEDIT • You can also • select a polyline and • then right-click in the drawing area to display a shortcut menu. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  30. Editing Polylines • Use the pick box to select a polyline to be edited. • If you use the pick box on a wide polyline, you must pick it on the edge of a polyline segment, rather than in the center. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  31. Editing Polylines • If the object you select is a line or arc object (not a polyline), the following message is displayed: • Object selected is not a polyline • Do you want to turn it into one? <Y> • Entering Y or pressing [Enter] turns the selected object into a polyline. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  32. Editing Polylines • Join Option • Allows a group of connected lines and arcs can be turned into a continuous polyline. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  33. Editing Polylines • There is no default option for the PEDIT command • You must enter one of the options. • Pressing [Enter] returns you to the Command: prompt. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  34. Opening and Closing a Polyline EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  35. Opening and Closing a Polyline • Open PLINEs can be Closed. • Closed PLINEs can be Opened. • hese functions are performed with the Open and Closeoptions of the PEDIT command. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  36. Opening and Closing a Polyline • If the PLINE is OPEN • It can only be CLOSED • If the PLINE is CLOSED • It can only be OPENed • AutoCAD displays only the appropriate option – NOT both options. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  37. Opening and Closing a Polyline • The Open optionis not displayed if you select a polyline that was closed bymanually drawing the final segment. • It is only available if the polygon was closed using the Close option of the PLINE command. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  38. Joining Polylines to Other Polylines EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  39. Joining Polylines to Other Polylines • Join Option • Allows polylines, lines, and arcs that share an EXACT endpoint can be joined to create a single polyline. • AutoCAD computes line vertices to 25 decimal places • Lines may appear to have the same endpoints, BUT in reality, do NOT. • You CANNOT join objects with PEDIT unless the endpoints match EXACTLY. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  40. Joining Polylines to Other Polylines • This option works only if the polyline and other existing objects meet exactly. • They cannot cross. • There cannot be any spaces or breaks between the objects. • Select each object to be joined EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  41. Joining Polylines to Other Polylines • To get the endpoints to match EXACTLY • You may have to MOVE an object • Turn OSNAP on • And MOVE the object using the ENDPOINT OSNAP to get the endpoints aligned. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  42. Changing the Polyline Width EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  43. Changing the Polyline Width • The Width Option • of the PEDIT command • allows you to change a polyline width to a new width. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  44. Editing a Polyline Vertex EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  45. Editing a Polyline Vertex • The Edit vertex option of the PEDIT command is used to • Edit polyline vertices and • Points of tangency. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  46. Editing a Polyline Vertex • A polyline vertex • is where straight polyline segments meet. • A point of tangency • is where straight polyline segments or polyline arcs join other polyline arcs. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  47. Editing a Polyline Vertex • When you enter the Edit vertex option, • an "X" marker • appears on screen at the first polyline vertex or point of tangency. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  48. Next Previous Break Insert Move Regen Straighten Tangent Width eXit Editing a Polyline Vertex The Edit vertex option has 10 options EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  49. Editing a Polyline Vertex • Next • Moves the "X" marker on screen to the next vertex or point of tangency on the polyline. • Previous • Moves the marker to the previous vertex or point of tangency on the polyline. • Break • Breaks a portion out of the polyline. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

  50. Editing a Polyline Vertex • Insert • Adds a new polyline vertex. • Move • Moves a polyline vertex to a new location. • Regen • Generates the revised version of the polyline. • Straighten • Straightens polyline segments. EDT 310 - Chapter 16 - Drawing and Editing Polylines and Splines

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