Learning AutoCAD 2010, Volume 1 phần 2 doc

Lesson: Displaying Objects ■ 33 Zoom Command Options Zoom Window ZOOM, Z; Pick 2 points to define the window in the drawing area To use the Zoom Window option, use any method listed above to start the command, click in the drawing to specify the first corner of the window (1), and then click to specify the second corner of the window (2). As a result, the drawing view is magnified and fills the drawing space with the area defined by the zoom window. Zoom Extents Use the Zoom Extents option to zoom to the extents of the drawing, that is, the area of the drawing in which objects are placed. When you zoom to the drawing extents, you magnify the drawing view so that all geometry in the current space (model space or paper space) is visible. ZOOM, Z; > E then press ENTER Zoom Previous Use the Zoom Previous option to return to the previous view. ZOOM, Z; > P then press ENTER 34 ■ Chapter 1: Taking the AutoCAD Tour Wheel Mouse Features The wheel mouse is a variant of the standard pointing device that is modified with a small wheel between the left and right buttons. You can rotate this wheel in small increments. You can use the wheel to zoom and pan in your drawing without using any commands. When zooming in, the location near your cursor is the focal point of the zoom and thus remains on the screen. The ZOOMFACTOR system variable controls the incremental change, whether forward or backward. The higher the number of the variable, the greater the zoom. How to Use the Wheel Mouse Do this To Roll the wheel forward Zoom In Roll the wheel backward Zoom Out Double-click the wheel button Zoom Extents Hold down the wheel button and drag the mouse Pan Press and hold the SHIFT key and the wheel button and drag the mouse Constrained Orbit Press and hold the CTRL key and the wheel button and drag the mouse Pan (Joystick) In some situations, when using the mouse wheel to pan or zoom, the actions have no effect on the drawing. For example, you might only be able to zoom out to a certain point. When this occurs, you must regenerate the drawing by clicking Regen on the View menu. Wheel Button Modes You can set the wheel button to function in two different modes. The value of the MBUTTONPAN system variable controls whether panning is supported. ■ If MBUTTONPAN is set to 1, the PAN command is activated when you use the wheel. ■ If MBUTTONPAN is set to 0, the Object Snap menu is displayed when you use the wheel. Lesson: Displaying Objects ■ 35 Regen Use the Regen command to regenerate all the geometry in the drawing.Use theRegenall command to regenerate all the geometry when there are multiple drawing viewports.When you regenerate the drawing, the screen coordinates for all objects in the drawing are recomputed and the drawing database is reindexed for optimal display performance. Command Access Regen Command Line: RE, REGEN, REGENALL Automatic Drawing Regeneration By default, when you create a new drawing, the REGENMODE system variable is set to 1. Thisenables the drawing to regenerate automatically whenever you perform an action that requires regeneration. Guidelines When Regenerating Large Drawings ■ Because regeneration recalculates the screen coordinates for all objects in the drawing, it usually takes longer to regenerate large drawings than smaller ones. ■ If you experience performance decreases on larger drawings, consider setting REGENMODE = 0 to prevent automatic regeneration. You can manually regenerate the drawing when you need to. 36 ■ Chapter 1: Taking the AutoCAD Tour Exercise: Zoom and Pan in the Drawing In this exercise, you open an existing drawing and use the Zoom and Pan tools to view different areas. The completed exercise Completing the Exercise To complete the exercise, follow the steps in this book or in the onscreen exercise. In the onscreen list of chapters and exercises, click Chapter 1: Taking the AutoCAD Tour. Click Exercise: Zoom and Pan in the Drawing. 1. Open C_Displaying-Objects.dwg. 2. On the View Tab, click Navigate Panel > Pan. 3. Alternatively: ■ Right-click anywhere in the drawing area. Click Pan. ■ Click and hold the mouse button and drag to change your view of the drawing. 4. While still panning the drawing, press and hold SHIFT. Note: This temporarily restricts the movement of the pan from any direction to orthogonal mode. 5. Right-click anywhere in the drawing. Click Exit to end the Pan command. Note: You can also press ESC to end the command. 6. On the status bar, click Zoom. Enter E in the command line to select the Extents option. Notice how the view changes. Note: If you have a three-button mouse with a scroll wheel, you can double-click the wheel button for the Zoom Extents command. Lesson: Displaying Objects ■ 37 7. Zoom in real time: ■ On the status bar, click Zoom. ■ Press ENTER to select real time. ■ Click and hold your mouse button and move the cursor up. ■ Still holding the mouse button, move the cursor down. ■ Notice that as you move the cursor up, the drawing zooms in and as you move the cursor down, it zooms out. Note: You can also activate the Zoom Realtime command by rotating the wheel on a wheel mouse. Rotating the wheel away from you zooms in, and rotating toward you zooms out. 8. Zoom to a window: ■ On the View tab, click Navigate panel > Zoom drop-down > Window. ■ Click two points around the center section of the drawing as shown by the arrows in the following illustration. 9. Pan to the lower left corner of the drawing. 10. On the View tab, click Navigate panel > Zoom drop-down > Previous. This returns you to the last view of the drawing that you zoomed or panned to. Note: Only the last 10 view changes are saved. 11. Close all files. Do not save. 38 ■ Chapter 1: Taking the AutoCAD Tour Exercise: Hands-On Tour In this exercise, you open an existing drawing. You use display commands and explore the user interface. The completed exercise Completing the Exercise To complete the exercise, follow the steps in this book or in the onscreen exercise. In the onscreen list of chapters and exercises, click Chapter 1: Taking the AutoCAD Tour. Click Exercise: Hands-On Tour. 1. Open C_Hummer-Elevation.dwg. Because the drawing was last saved with the Color layout view active, the drawing opens to that layout. 2. On the status bar, click Zoom. Enter E and press ENTER to select the Zoom Extents option. The drawing is magnified to fill the screen. If your workstation is equipped with a wheel mouse, double-clicking the roller button also selects Zoom Extents. 3. Use the wheel mouse, if you have it. Position the cursor to the left of the top view and roll the wheel forward then backward. If you do not have a wheel mouse, right-click anywhere in the drawing window and click Zoom. Hold the left button down and drag the mouse up and down. See how the magnification changes. Exercise: Hands-On Tour ■ 39 4. On the View tab, click Navigate panel > Zoom drop-down > Extents to view the entire drawing layout. 5. Now you switch the drawing view to model space, which is where the geometry for the drawing resides. On the status bar, at the bottom of the AutoCAD window and to the right, click Model. 6. On the View tab, click Navigate panel > Zoom drop-down list > Window. Click near the points indicated in the following illustration to magnify the area defined by the window. 7. On the View tab, click Navigate panel > Zoom drop-down list > Previous. This returns you to the previous view. 8. On the Quick Access toolbar, click Save. 9. In the Application Menu, select File > Close. 10. In the Application Menu, top right, you see a list of previously opened files for quick access. 40 ■ Chapter 1: Taking the AutoCAD Tour Select the C_Hummer-Elevation drawing. Notice that it is opened to the last view in which it was saved. 11. On the bottom right of the AutoCAD window, click Layout to activate the color layout. Close the drawing. 12. Now you start a new drawing. On the Quick Access toolbar, click New. 13. In the Select Template dialog box, click the arrow next to Open. Click Open with no Template - Imperial. This opens a blank drawing with basic settings that you can change, such as the units format. Note: For AutoCAD LT users, click acadlt.dwt. 14. Move your cursor near the upper right corner of your drawing area. Observe that the coordinate readout shows a screen size of about 12 x 9 units. 15. Close all files. Do not save. Chapter Summary ■ 41 Chapter Summary Now that you have been introduced to several core features, you can begin learning how to create geometry. Having completed this chapter, you can: ■ Identify and state the purpose of the main interface elements. ■ Open, create, and save drawings. ■ Use the Zoom and Pan commands to view different areas of the drawing. 42 ■ Chapter 1: Taking the AutoCAD Tour [...]... coordinate 24 ,46 @24 ,46 Polar coordinate 15 . Cartesian or Polar coordinates would be as follows: Point 2: @4,0 or @4<0 Point 3: @0 ,2 or @2& lt;90 Point 4: @ -1, 0 or @1& lt ;18 0 About Dynamic Input The Dynamic Input interface. Absolute Relative Cartesian coordinate 24 ,46 @24 ,46 Polar coordinate 15 <45 @15 <45 50 ■ Chapter 2: Creating Basic Drawings Example of Cartesian Coordinate. last view in which it was saved. 11 . On the bottom right of the AutoCAD window, click Layout to activate the color layout. Close the drawing. 12 . Now you start a new drawing.