tailieunhanh - autocad 2007 and autocad lt 2007 bible - phần 2

Mở từ đĩa CD-ROM. 2. Lưu tập tin như trong thư mục AutoCAD Kinh Thánh của bạn. Nó trông giống như hình 10-20. 3. Chọn Kéo dài trên thanh công cụ Modify. Tại Chọn hoặc các đối tượng: dấu nhắc, chọn dòng tại 1 trong hình 10-20 và sau đó nhấn Enter. | 88 Part I AutoCAD and AutoCAD LT Basics 15. At the Specify next point or Undo prompt pick point 2 . If necessary rightclick the coordinates and choose Absolute to get absolute coordinates. 16. If Dynamic Input is not on click the DYN button on the status bar. Follow the prompts Specify next point or Undo Pick .5 180. This means that you see a length tooltip of .5 and an angle tooltip of 180 . Specify next point or Close Undo Pick 90. Specify next point or Close Undo If you turned off OSNAP in Step 13 press F3 to turn it on again. Pick the endpoint at 0 in Figure 4-26. Specify next point or Close Undo J 17. Save your drawing. Note Even if you have running object snaps if you specify an object snap during a command it overrides the running object snap. For example having a running endpoint object snap does not mean you can t use a midpoint object snap for any specific drawing command. By default if you type absolute or relative coordinates they take precedence over any running object snaps. This lets you leave running object snaps on but override them with keyboard entry of typed coordinates whenever you want. In general the default gives you the most control and flexibility. However you can change this default to give running object snaps precedence. To change the default choose Tools Options click the User Preferences tab and use the Priority for Coordinate Data Entry section of the dialog box. Locating Points Sometimes you need to locate a point that is not on an existing object. For example you may need a point a certain distance and angle from an existing object. This section explains three techniques that enable you to locate points that are not on objects object snap tracking point filters and the From feature. Object snap tracking The purpose of tracking is to let you specify a point based on the object snaps of existing objects. Temporary tracking lines are drawn from points you specify and guide you so that you can easily specify the point that you