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Black Box 4
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autocad
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acadtut.arj
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LESS3.EXE
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LESS3.TXT
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Lesson 3 Page 1 of 2
Mirror
Explode
Change
Qtext
1. Mirror
The command mirror is useful for getting a mirror image of
entities on an existing drawing. It may also save time to draw
only one half of a detail and mirror it, so that both halves
are perfectly symmetrical.
The objects are mirrored about a line defined by the user. This
line may be vertical, horizontal or angular, it important that
ortho mode be on or some strange effects may happen.
You should also note that layers that are turned off or frozen
will not be mirrored.
A system variable called mirrtext must be set to 0 for text to
be mirrored and not be in the mirror image mode. The command is
located on the tablet menu. This works only for text that is
horizontal.
Vertical text will mirror but, you will find that the bottom
lines of text will become the top line, dimension text will end
up under the dimension lines and you will spend much time
moving it to the proper locations. You may be farther ahead to
erase the text and reenter it, you will have to make that
judgment.
2. Explode
The explode command is used to break down blocks and sometimes
dimensions and entities called polylines into their individual
entities.
When a block is exploded it not only breaks down the block to
its individual lines, arcs, circles and text but it reverts the
entities back to the layer/layers which it was created on. A
block which was created on layer 0 will revert back to layer 0
and all entities within the block will loss the colors and
qualities that was assigned to them when they were inserted
into the drawing.
Blocks that have been mirrored can not normally be exploded. A
special command called "expblk" has been written to do this
function.
Lesson 3 Page 2 of 2
3. Change
As the name implies this command will change any entities
properties. Change works much the same as move or erase, in as
much as, you have to select the entities to change using single
pick, window or crossing. Change was meant to change the
location (x,y) of the end point of a line or several lines to a
new location. You may also change the properties of the
entities such as, layer, color, linetype, elevation and
thickness. It is not advisable to change the color of an
entity, in fact don't. It will only serve to confuse yourself
and other users as to what layer that entity resides. You may
change the placement of text by picking a new (change) point
then picking the text entity to move. You may also change the
text but, note, that this is done as one line of text and
therefore the entire line must be retyped. We have other
routines that are quicker and more accurate for modifying text,
please use them instead of change. Elevation and Thickness are
described in the manual and are not used much in our
application. Should you find that an entity or group of
entities is on the wrong layer the change command is a good way
to return them to the proper layer. Please be aware of the
color and line type characteristics for the layer you are
changing the entities too.
4. QTEXT
Qtext is short for Quick Text. When this command is invoked all
text existing in the drawing becomes represented by a rectangle
after a "regen". The text is no longer visible but the
rectangles appear as sort of a place holder for the text. The
advantage of qtext is that when a regen is performed the text
entities do not have to be mathematically calculated by the
computer hence making the regen much faster. The disadvantage
is that the text can no longer be read, until qtext is set to
"off" and another regen is forced by the command: "regen" <cr>.