Autodesk 00126-050008-1640A User Guide - Page 168

12 Tracing 2. After the line has been recognized, the command completes. To trace an arc 1. Run tracing using one of the following methods: On the Raster to Vector toolbar click Trace Arc button. -orFrom the rConvert menu select a tracing mode, and then Arc. If some available raster images are inserted into the picture, then the selection dialog box appears. Select the image that you want to trace with this box. 2. Specify the start, middle and end points of an arc lying over the raster object to be traced. 3. To trace another raster arc, repeat steps 1-2. To trace a circle 1. Run tracing using one of the following methods: On the Raster to Vector toolbar click Trace Circle button. -orFrom the rConvert menu select a tracing mode, and then Circle. If several available raster images are inserted into the picture, then the selection dialog box appears. Select the image that you want to trace from this box. 2. Specify two points - opposite sides of a raster circle to be traced. 3. To trace the next circle, repeat steps 1-2. ÞIn the above three methods if the program cannot recognize an object under the vector line, the following message will appear in the command line: Nothing has been recognized. Then the command is completed. Trace Hatch This sort of tracing enables you to trace a single raster hatch of a primary type (consisting of straight raster lines with the same angle), enclosed in a raster outline. To trace a hatch you need to draw a polyline crossing all the lines of the raster hatch. The program automatically detects the boundary of the hatched area and creates a hatch. Þ The hatch recognition of this type can only be used on monochrome images. 173