Autodesk 05720-017408-9641 User Guide - Page 171

WiseImage - User's Guide When tracing raster polylines you can also use the orthogonalization mode. It allows you to align obtained line segments by the base angle. In the orthogonalization mode the program will generate a vector polyline consisting of segments perpendicular and parallel to the direction specified by you or automatically calculated by the program. * More detailed information on customizing polyline orthogonalization mode is provided in section "Trace Tab" on page 186. Tracing raster polyline is also influenced by the parameters Max Width, Max Break and Approximation that specify the maximum width of a raster line, the size of ignored breaks and the accuracy of raster line approximation. * More detailed information on these parameters customizing is provided in section "Options tab", page 185. When tracing polylines you can use several input options: to enter a keyletter into the command line, the cursor menu, or the Line Following panel buttons. Button and option Description Direction Inverts a tracing direction Backstep Cancels the latest tracing step backSegment Cancels the latest polyline segment DrawLine Center Redraw Enables adding a linear segment of a polyline without tracing. Several segments can be added with SHIFT pressed. Zooms the image to show the last added polyline vertex in the screen center Redraws AutoCAD screen in the Line Follow mode We will now describe in detail the procedure for polyline tracing without autodetection of tracing direction. To trace a polyline 1. Run tracing using one of the following methods: On the Raster to Vector toolbar click the Trace Linefollow button. - or From the rConvert menu, choose a tracing mode, and then Linefollow. If some available raster images are inserted into the picture, then the selection dialog box appears. Select an image to be traced from this box. 176