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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: Extend & Break (Part 3)

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 covered the Trim tool, with 3 features: Trim Polylines, Trim Others, and Trim Box. Part 3 will cover the Extend and Break features.

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

Extend

This tool can be used when you have a drawing entity that needs to be extended to another line, maintaining the same slope or curve. Water-surface and ground profiles are imported into the DXF editor as polylines (note: only drawing entities with consistent attributes [slope, curve, angle, etc.] can be extended; this tool does not work with polylines consisting of segments with varying slopes. However, once exploded, linear portions may be extended).

Step-by-Step How-To's:

  1. Select "Extend" from the Modify dropdown menu.
  2. The Command line will display, "Select entities."
  3. Using the mouse, select the entities you would like to both extend and extend to. Multiple lines can be selected for each. Right-click when you are done selecting.
  4. The Command line will display, "Select Entity to Extend."
  5. At this point, using the mouse you can click on the lines you would like to extend. RASPLOT will automatically extend to the nearest possible intersecting line. Multiple clicks will continue to extend the line to the next possible intersection point of all the previously selected lines (as shown in Figures 3.1 to 3.4).

    One click on the green line extends the line with a uniform slope to the intersection point of the first selected vertical line:

    Second click on the green line the extends line with a uniform slope to the intersection point of the second selected vertical line:

    One click on the red line extends the line with a uniform slope to the intersection point of the first selected vertical line:

    Second click on the red line extends the line with a uniform slope to the intersection point of the second selected vertical line:

  6. Right-click or press the "Enter" key to exit Extend mode.

Break

This tool can be used when you would like to break apart a drawing object between two user-defined points (note: the portion between the selected points is automatically erased). This tool is useful in instances where you would like to manually insert a dash in a line while maintaining the same slope.

Step-by-Step How-To's:

  1. Select "Break" from the Modify dropdown menu.
  2. The Command line will display, "Select entities."
  3. Using the mouse, select the entity that you want to break apart by clicking once.
  4. The Command line will immediately display, "First point."
  5. Click once at the first point where you would like the break to occur. The Command Line will immediately display, "Second point."
  6. Click once at the second point where you would like the break to occur. The entity will break immediately and the broken portion will be erased.
  7. Deselect the remaining line portion (left piece) by pressing the "Esc" key. The new broken segment (right piece) will remain selected until you manually select and deselect it.

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