Snap and Grid are two modes used to aid you in creating and editing objects. The Object snap mode is one of the most important mode for locking onto key object points. Figure 2-76
LINE commands are
Object snap mode that were activated by holding down the shift key and pressing the right mouse button. This pop down menu will display on the screen whenever the cursor is currently
positioned another method of entering Object
Snap modes is from the keyboard, when entering
object snap modes from the keyboard only the first
three letters are required.
Using Options of the OSNAP Command
Snap-Center
Use this mode to snap to the center of a circle or are. To
accomplish this, activate the mode by clicking on the
Snap –Center button and moving the cursor along the edge of the circle or are similar to Figure 2-78 Notice the Auto snap symbol appearing at the center of the circle or are
Snap-Endpoint
This is one of the more popular Object snap modes that is very helpful in snapping to the endpoints of lines or Arc. Activate this mode by clicking on the Snap Endpoint button and move
the cursor along the edge of the object to snap to the
from option requires a base point. Identity the point at the
intersection of corner” A” The next prompt asks for an offset
.This completes the use of the from option and identifies the center of the circle at “B”.
Osnap-Isert
This object snap option snaps to the insertion point of ab object.
Activating the Osnap Insert mode and positioning the cursor any place on the text snap to its insertion point in this case at the lower left corner of the text at “A” The other object illustrated o Figure 1-81 is called a block .It appears to be constructed of numbers line objects that make up the block are considered to be a single object.
OSNAP-Intersection
Use this mode to snap the intersection of two objects Position the cursor anywhere near the intersection of two objects and the intersection symbol appears see
Osnap-Apparent Intersection
Use the Osnap Apparent Intersection mode to snap to an intersection not considered obvious from the previous example Figure 2-83
shown two lines that do not intersect Activate the Osnap-Apparent In persecution mode node click on both lines Notice the intersection symbol present where the two lines apparently interest.
Osnap-Midpoint
This Object Snap mode snaps t the midpoint f objects Line
examples are shown in Figure 2-84 When activating the
Osnap-Midpoint mod touch the objects any whare with some portion of the cursor; the midpoint symbol will appear at the exact midpoint of the object.
Osanap- Nearest
This Objects mode anaps to the nearsest point it finds on an object. The nearest point is calculated based on the closest distance from the intersection of the crosshairs
perpendicular to the object; or the shortest distance from the crosshairs to the objects. In Figure 2-85,
Osnap- Node
This Objects mode snaps to node or point touching the point in Figure 2-86 to its center, The Osnap Nearest shown in Figure 2-85 can be used snap to a point.
Osnap-Perpendicular
This is a helpful Objects Snap mode for snapping to an objects normal or perpendicular from a previously identified point. Figure 2-87. Shows a line segment drawn perpendicular from the point at “A” to the inclined line “B” A 90-degree angle is formed with the perpendicular line segment and the inclined line “B” with mode, you are also able to construct lines perpendicular to circles.
Figure 2-84 Figure 2-82
Figure 2-83
Figure 2-85
Osnap- Quadrant
Circle quadrants are defined as points located at the 0-, 90-, 180, and 270 of a circle, as in figure 2-88. Using the Osnap-Quadrant option will snap to one of these four positions as the edge of a circle or arc is selected. Circle in Figure 2-88, the edge of the circle is selected by the cursor location. The closest quadrant to the cursor is selected.
Osnap-Tangent
In this case, the Osnap- Tan-gent mode is being used in conjuction with the LINE command. The point at “A” is anchored to the top of the circle using the Osnap-Quadrant mode. Follow this command prompt sequence constructling a line segment tangent to two circles.
Command: LINE From point: Qua
From (Selecting the circle near “A”) TO point : Tan
mode will provide a quick and easy way to locate
the center of the rectangle without drawing
any extra geometry.
When tracking is started and a point is picked on
the screen, AutoCAD forces the next point to
from that could extend vertically or
horizontally from the first point. The first point may
retain separate X or Y values. Use the operation
of tracking mode. For best be sure Ortho mode is turned off.
Command : CIRCLE
3p/2P/TT/<Center point>:TK (For tracking) First tracking point : MID
Of (Select the midpoint at “A” in Figure 2-91A) Of (Select the midpoint at “B” in Figure 2-91A)
Next point (Press ENTER to end tracking):(PressENTER Diameter/<Radius>:D(For diameter)
Diameter: 0.50
The result is illustrated in Figure 2-91B with the hole drawn in the center of the rectangular shape.
Alternate Methods of Choosing Osnap Options
here is an additional aid to bring up all options of Objects snap. Holding down (Shift) key located on the keyboard and pressing the ENTER button of the mouse automatically brings up a pull down menu containing all objects snap modes (See Figure 2-92).
Figure 2-90
Choosing Running Osnap from the Osnap Setting Dialog Box
So far al Osnap modes have continuously been selected from the popdown menu of entered in at the keyboard. The problem with these methods is that if a certain mode was used over a a series of commands. The Osnap mode has to be selected every time. These Osnap button illustrated in Figure 2-93B. is clicked on twice this turns off the current Running Osnap options. Cick twice again on the Osnap on the modes will be back in effect.