Autodesk 00308-011408-9F30A User Guide - Page 26

AutoSketch expresses location in three ways: xy (Cartesian), polar, and isometric coordinates. X-and y-coordinates express location in terms of horizontal and vertical distances from another point. Polar coordinates express location in terms of distance (radius) and angle. For example, the xy coordinates 7,5 are equivalent to the polar coordinates 8.6,35.5. Isometric coordinates differ from x- or y-coordinates in that they add a third axis (z) to the expression. Isometric drawings are usually used to create twodimensional views of a three-dimensional object. Drawing Origin AutoSketch locates most points in relation to the drawing origin, even if you move the grid origin. If you move the drawing origin on the page, the entire drawing shifts to reflect that change. The drawing origin appears onscreen as colored arrows indicating the positive x and y (and, if isometric, z) directions. It does not appear on printed output. Normally, the drawing origin is located at the lower-left corner of your page, however, if you need to move it, you can center the Drawing Origin on the page, or relocate it with the mouse, or by entering new coordinates. For more information on moving or modifying the Drawing Origin, see "Moving the Drawing Origin" on page 49. 16 | Chapter 2 Important Concepts