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The DXF Editor is the graphical plotting program used in conjunction with RASPLOT to produce standardized NFIP Flood Insurance Study profile tables. In RASPLOT, data is converted from the database files to automatically generate water-surface profiles in the FEMA-approved format, which includes the water-surface profiles, table labels, legend, road crossings, bridges, and culverts. While the program generates most of the needed items for a profile table, there are several details that need to be modified and changed manually. A user will need to know how to use the tools featured in the DXF Editor in order to make these changes.

How To Use the DXF Editor: Modify Tools: Trim (Part 2)

The MODIFY Tools menu is located on the top main menu bar of the DXF Editor. There are several MODIFY tools that can be used to edit graphical details when creating flood profiles. Part 1 covered the following tools: Erase, Copy, Move, Rotation, Scale, Text, and Explode. Part 2 will cover the Trim tool, with 3 features: Trim Polylines, Trim Others, and Trim Box.

The following descriptions give step-by-step instructions on how to use each Trim tool:

Trim Polylines

This tool can be used when you have a polyline that needs to be cut at an intersecting point with another line. Water-surface and ground profiles are imported into the DXF editor as polylines (note: after a profile line is exploded, however, it is no longer a polyline). Note: Cut edges-lines to which you would like to trim another object-must must be ungrouped in order to be selected. Gridlines in the DXF editor are always grouped and need to be exploded to be ungrouped, prior to selecting (see the April bulletin for instructions regarding the Explode command).

Step-by-Step How-To's:
  1. Select "Trim>Trim Polylines" from the Modify dropdown menu.
  2. The Command line will display, "Select a cut edge."
  3. Using the mouse, select the polyline that you want to use to trim another with. Only one line can be selected at this point.
  4. The Command line will display, "Select a trim entity."
  5. At this point, using the mouse you can click on polylines that intersect the previously selected line, and they will be trimmed on the side that you click. Multiple polylines can be trimmed.
  6. Right-click or press "Enter" to exit Trim mode.
    Note: The "Trim Others" and "Trim Box" tools work on ungrouped drawing lines and objects. Data imported from RASPLOT (water-surface profiles, ground profiles, symbols, gridlines, etc.) into the DXF editor are typically grouped, and need to be exploded to be ungrouped, prior to editing (see the April bulletin for instructions regarding the Explode command). Before following the instructions mentioned below, make sure that target drawing objects are exploded first.

Trim Others

This tool can be used when you would like to trim drawing objects to two or more intersecting line points.

Step-by-Step How-To's:
  1. Select "Trim>Trim Others" from the Modify dropdown menu.
  2. The Command line will display, "Select entities."
  3. Using the mouse, select the entities that you want to use to trim with. Multiple objects can be selected at this point.
  4. Right-click the mouse or press "Enter" to continue.
  5. The Command line will display, "Select entity to trim."
  6. At this point, select the entity you would like to trim. The entity will be trimmed to the nearest selected trim lines.
  7. Right-click or press "Enter" to exit Trim mode.

Trim Box

This tool can be used when you would like to trim drawing objects within a box area drawn by the mouse.

Step-by-Step How-To's:
  1. Select "Trim>Trim Box" from the Modify dropdown menu.
  2. Using the mouse, draw a box over the area you would like to delete.
  3. When you release the mouse, the area within the box area will be deleted. Note: Remember that the Trim feature works with ungrouped items. Items may need to be exploded first before this tool is useful.

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Last Modified: Wednesday, 27-Jun-2007 11:57:20 EDT