Specifying Coordinates in .NET

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To turn on polar tracking, check Polar Tracking On on the Polar Tracking tab of the Drafting Settings dialog box. If you are not in the dialog box, press F10 or click the POLAR button on the status bar. To use polar tracking, you need to move the cursor slowly through the angles to give AutoCAD time to calculate and display the vector and tooltip. Say that you are drawing a line. Specify the start point. To specify the second point, move the cursor in the approximate angle of the line you want to draw. When you see the polar tracking vector and tooltip, leave the mouse where it is and type the length of the line. Then press Enter. AutoCAD creates the line with the proper length and angle. You will find this method easier than typing polar coordinates for lines with angles specified in your polar tracking settings.
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Turn on NumLock on your keyboard and use the numerical pad for typing in lengths. Use the Enter key on the numerical pad as well.
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You can specify a polar angle for just one command. If you re drawing a line, the polar angle applies for one segment only. If you re drawing a line, after specifying the first point, for example, type the angle preceded by the angle symbol (<). AutoCAD then locks the next segment to that angle while you type its length. A polar angle specified in this way is called a polar override angle because it overrides the current polar angles in effect. Of course, a polar override is not faster than simply typing a polar coordinate, but it does let you see the angle of the line segment (if you re drawing a line) before you type its length. In the following exercise, you practice using direct distance entry with ortho mode and polar tracking. Before beginning, check that Polar Tracking is set for 45 degrees, as described previously.
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The drawing (ab4-b.dwg) used in the following Step-by-Step exercise on using direct distance with ortho mode and polar tracking is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
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Step-by-Step: Using Direct Distance with Ortho Mode and Polar Tracking
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1. Open drawing ab4-b.dwg from the CD-ROM. 2. Choose File Save As to save the drawing in your AutoCAD Bible folder as ab4-3.dwg. If ORTHO is not on (that is, if the ORTHO button on the status bar doesn t look pushed in), click ORTHO. 3. Start the LINE command and, at the Specify first point: prompt, type 2,2 . 4. Move the mouse horizontally to the right, and then type .5 . 5. Move the mouse up vertically (in the 90-degree direction), and then type .5 . 6. Move the mouse horizontally to the right, and then type 2 . Your drawing should look like Figure 4-10.
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Figure 4-10: Drawing with direct distance entry enables you to specify coordinates by typing in a length after you move the pointer in the desired direction.
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7. Move the mouse up in the 90-degree direction, and then type .5 . 8. Move the mouse to the left in the 180-degree direction, and then type 2 . 9. Move the mouse up in the 90-degree direction, and then type .5 . 10. Move the mouse to the left in the 180-degree direction, and then type .5 . 11. Move the mouse down in the 270-degree direction, and then type 1.5 . Press Enter again to end the command. 12. Click POLAR on the status bar. The ORTHO button pops out. 13. With your cursor in the drawing area, right-click with your mouse and choose Repeat Line from the shortcut menu. 14. Press Enter to start the new line from the most recent point. At the Specify next point or [Undo]: prompt, move the cursor diagonally up and to the left so the line is approximately in the 135-degree direction. When you see the tooltip confirming the angle, let go of the mouse and type .7071 . 15. Move the cursor up until you see the polar tracking tooltip confirming a 90degree angle. Type .5 . 16. Move the cursor diagonally in the 45-degree direction until you see the tooltip. Type .7071 . Press Enter again to end the LINE command. 17. Save your drawing. It should look like Figure 4-11.
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