Forced tarce

Forced trace

This functionality is available only in the Raster module

Forced tracing allows you to replace raster objects with vector ones of a specified type. The user selects one of the three object types (line, arc or cirle) to be used as reference object for tracing (line, arc or circle), and then specifies points on a raster line, as if drawing a vector entity above the raster entity. The program tries to trace the specified object with a vector of the same shape. If possible, the raster line is traced. Unlike the TraceAuto command, these methods allow you to trace a part of a raster entity, as well as entities with significant shape distortions.
If the object width exceeds the value of Max. thickness parameter, or its shape cannot be approximated by the object of the specified type, then it is not traced.
When tracing by Line and Arc method, the ends (both or one of them) of reference lines and arcs can be specified outside the traced raster objects – on their imaginary continuation. In this case, the raster object is traced to its endpoints. If the ends of the reference objects lie on a raster object, then the part of the raster object located under the reference object is traced. If you want to recognize the line up to its finite limits, Check the Auto-extend vectors box in the Trace tab of the R2V Conversion Options dialog box.
Trace line
Ribbon: Raster– Trace – Trace > Line
Menu: Raster– Trace > Line
Command line: TRACELINE

• Run the command;
• specify the beginning and end of the line lying on the raster object to be traced.
  If the program cannot recognize the object under the vector line, a beep sounds.
  

Trace arc
Ribbon: Raster– Trace – Trace > Arc
Menu: Raster– Trace > Arc
Command line: TRACEARC

• Run the command;
• Specify the first, middle and end points of the arc, lying on the raster arc to be traced.
  To trace the next raster arc, repeat steps 1 and 2.
  

Trace circle
Ribbon: Raster– Trace – Trace > Circle
menu: Raster– Trace > Circle
Command line: TRACECIRCLE

• Run the command;
• Specify two points – the ends of diameter of the raster circle to be traced.
  To trace the next circle, repeat steps 1 and 2.
  

Trace outline
Ribbon: Raster– Trace – Trace > Outline
Menu: Raster– Trace > Outline
Command line: TRACEOUTLINE
The Trace outline method is intended for tracing raster objects with closed boundaries. As a result of this operation, a closed polyline is created, it reproduces the object outline and the hatched area inside the outline.
To trace the outline:

• In the Trace tab of the R2V Conversion Options dialogue box, set parameters for tracing outline with the selected method;
• Run the command;
• Specify a point inside the outline.
  The outline trace results depend on the parameters set in the Trace tab of the R2V Conversion Options dialogue box.
  

Trace options

Specified option	Trace result	View
Auto extend vectors – disabled	The vector is created along the border of two colors; the hatch type depends on the type selected in the Options tab
Auto extend vectors – enabled	Creates a vector at the center of the raster line, taking into account its width; the line thickness is set in the Options tab
Export single contour – disabled	Creates outer and inner contours based on raster data within the boundaries of the specified area
Export single contour – enabled	Creates an outer contour only; raster data are ignored

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