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Use Coordinate Filters

May 20, 2011

       Point filters provide a method of locating a point in a drawing relative to another point without specifying the entire coordinate. Using a point filter, you can enter partial coordinates, and then the program prompts you for the remaining coordinate information. To use xyz point filters, respond to the prompt for a coordinate with a filter in the following form:

.coordinate

       where coordinate is one or more of the letters x, y, and z. The program then prompts you for the filtered coordinate(s). For example, if you type .xy, the program prompts you to select a point whose xy coordinate you want, and then prompts you for the z coordinate. The filters .x, .y, .z, .xy, .xz, and .yz are all valid filters.


Using point filters in two dimensions

       You can use point filters when you work in two dimensions to locate points in relation to existing entities. For example, to draw a circle centered in a rectangle, start the Circle command, and then respond to the prompts as follows:

2Point/3Point/Ttr(tan tan radius)/Arc/Multiple/<Center of circle>: .y

Select Y of: mid

of: (select the left side of the rectangle)

Still need XZ of: mid

of: (select top of the rectangle)

Diameter/<Radius>: (specify radius of circle)

\

 

You can use point filters to center the circle by separately selecting the midpoints of two sides of the rectangle (A and B) and then specifying its radius.


Using point filters in three dimensions

       You can use point filters when you work in three dimensional space to locate points in two dimensions and then specify the z coordinate as the elevation above the xy plane. For example, to begin drawing a line from a point with a z coordinate 3 units above the center of a circle, insert the circle, and then start the Line command and respond to the prompts as follows:

ENTER to use last point/Follow/<Start of line>: .xy

Select XY of: cen

of: (select a point on the circle)

Still need Z of: 3 (locates the starting point 3 units above the center of the circle)

Length of line: (specify the length of the line)

\

 

You can use point filters to draw a line by first selecting a point in the xy plane (A), specifying the z coordinate (B), and then specifying the length of the line (C).

Commands Reference

BLIPMODE: Controls the display of marker blips

ID: Displays the coordinate of a location

LIST: Displays database information for selected objects

GRID: Displays a dot grid in the current viewport

SNAP: Restricts cursor movement to specified intervals

TABLET: Calibrates, configures, and turns on and off an attached digitizing tablet

UCS: Manages user coordinate systems

UCSICON: Manages defined user coordinate systems

UNITS: Controls coordinate and angle display formats and precision

System Variables Reference

BLIPMODE: Controls whether marker blips are visible

COORDS: Controls when coordinates are updated on the status line

LASTPOINT: Stores the last point entered, expressed as a UCS coordinate for the current space; referenced by the at symbol (@) during keyboard entry

ELEVATION: Stores the current elevation relative to the current UCS for the current viewport in the current space

TABMODE: Controls the use of the tablet

 

 

 

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