T-FLEX Parametric CAD. Fundamentals. 2D Design

Fundamentals. Two-Dimensional Design
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For a simple way of defining an exact value of the circle radius while
rubberbanding, use the property window in transparent mode. Besides,
one can call a dialog box with the complete set of circle parameters via
the option of the automenu.
The parameters dialog box allows defining, besides the radius, the
circle’s general system parameters, such as visibility level, layer and
color. For instance, the default drawing settings of visibility are such
that construction entities with the level defined in the range 0-127 are
visible (see the command “SH: Set Levels”). This means, changing
the level value of the circle being created to “-1”, will hide the circle
from display, as the level value is not in the range 0-127.
For already created circles, in command waiting mode point the cursor
at the circle and double-click . The circle parameters dialog box
will appear on the screen. Change the level value to “-1” and
press [OK] to confirm the input. Note that the circle disappeared from display. However, this does not mean
that the circle is completely removed from the model Move the cursor to the location where the circle used to
be, and once again click . The circle will be selected, in spite of being invisible. Call the parameters dialog
box again and set a different value for the visibility level, for example, “0” (zero). Now, as you press [OK],
the circle becomes visible again.
Note: to actually make the hidden drawing elements unselectable, set the appropriate value for the
parameter “Screen|Element selection” in the “Customize|Status” command.
Another way of making a circle invisible is by using layers. Place the circle on a certain layer, and then set
the layer invisible in the command “QL: Configure Layers”. To place the circle on a layer, enter the layer
name either in the “Layer” entry of the circle parameters dialog box, or in the respective field of the system
toolbar.
Another type of a circle often used in base geometry construction is a circle tangent to two lines. In order to
try creating this type of a circle, begin again with the “C: Construct Circle” command.
First, move the cursor over the vertical line that already exists on the
drawing, and type . The line will get highlighted, and the cursor will
start rubberbanding a circle locked tangent to the selected line.
Now move the cursor over the horizontal line and once again type . The
second line will be selected, and the rubberbanded circle will now be
tangent to two lines.
The dynamically changing circle radius will be displayed in the coordinate field of the status bar. Note that
you can move the cursor to any of the four quadrants defined by the lines, and the rubberbanded circle will
correctly follow the cursor.