Autodesk AUTOSKETCH 8, Руководство пользователя

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There are also four automatic modifications you can have AutoSketch make
to the point you enter. These “lock modifiers” force the point you enter into
horizontal, vertical, orthogonal, or “normal” alignment with the last point.
You can choose a lock modifier at any time in the drawing or editing process
by clicking its button on the All-In-One toolbar or by typing the letter shown
on the button.
Snap and lock commands are also located on their own toolbars, which
contain the same commands as the toolsets but can be docked anywhere
onscreen.
When snaps involving the mouse are active, a red AutoPoint Indicator appears.
As you move the pointer over the drawing, each type of snap point is repre-
sented by a different symbol: squares for endpoints, triangles for midpoints,
circles for centerpoints, and so on. If a lock modifier is active as well, a dotted
line extends from the AutoPoint Indicator to the actual point, as constrained
by the lock modifier. For instance, if you draw a diagonal line from top to
bottom, then activate Endpoint snap and the Y-axis lock modifier, the square
AutoPoint Indicator identifies the endpoint nearest the pointer, but a dotted
line extends to the potential snap point based on the current snap and lock
modifier.
Keys used to specify snaps and lock modifiers
Key Snap
AutoPoint
Indicator Lock Modifier
2 2-Point Intersection snap
A Absolute
B Basepoint snap
C Centerpoint snap
E Endpoint snap
G Gridpoint snap