The capture and selection of AutoCAD objects

2.7.1 using object capture

Object capture is one of the most important tools in AutoCAD, the use of object capture can be precisely positioned, so that users can directly use the cursor in the drawing process to accurately determine the target point, such as center, endpoint, pedal and so on.

In AutoCAD, the user can do the object capture mode at any time through the following ways:

(1) Use the object snap (object capture) toolbar.

(2) Press the SHIFT key while right-clicking, pop-up shortcut menu.

(3) Enter the appropriate abbreviation in the command.

Here's a description of the various capture types, see figure 2-27.

(1) "Endpoint (Endpoint)": Abbreviated as "end" to capture the endpoints of objects such as arcs or lines.

(2) "Midpoint (midpoint)": Abbreviated as "MID", used to capture the middle point (dividing points) of the object.

(3) "intersection": Abbreviated to "INT" to capture the intersection of two objects.

(4) "Apparent Intersect": abbreviated as "APP", used to capture the intersection point after two objects are extended or projected. When two objects do not intersect directly, the system can automatically calculate the intersection point of the extension, or the intersection points of the space different plane lines in the projection direction.

(5) "Extension (Extended)": Abbreviated as "EXT", used to capture a point on an object and its extended path. In this capture mode, when you move the cursor over a line or an arc, a dashed line is displayed along the line or ARC path, and the user can select a point on the dotted line.

(6) "Center (center)": Abbreviated as "CEN", used to capture a circle or arc of the center.

(7) "Quadrant (Quadrant Point)": Abbreviated as "QUA" for capturing the quadrant points on a circle or circular arc. A quadrant is a point on a circle at 0°, 90°, 180°, and 270° directions.

(8) "Tangent (Tangent)": Abbreviated to "TAN", used to capture the tangent point between objects.

(9) "Perpendicular (pedal)": Abbreviated to "per", used to capture the drop point of a specified point to another object.

(a) "Parallel (parallel)": Abbreviated to "PAR" to capture a point parallel to the specified line. After you create a line and determine the first endpoint, this capture method allows you to move the cursor over an existing line object that displays a parallel capture tag, and then moves the cursor to the specified position, displaying a dashed line parallel to the original line, where the user can select a point.

(one) "Node (nodes)": Abbreviated as "NOD" for capturing point objects.

(An Insert point): abbreviated to "INS" to capture the insertion point of an object such as a block, shape, text, property, or property definition.

(nearest): abbreviated as "NEA", used to capture the point closest to the specified points of the object.

(zero) "None": Abbreviated to "NON", not using object capture.

(a) "from (Start)": Abbreviated as "FRO", which can be used in conjunction with other capture methods to specify the base point of the capture.

(a) "temporary track point (temporary Trace)": Abbreviated as "TT", which can be tracked by polar axes at specified points. About polar Axis tracking see Chapter 3rd.

In addition to capturing objects in a variety of ways, the user can also set some capture mode to automatically capture the state, and AutoCAD will automatically determine the target point that matches the capture settings and display the capture tag. For automatic object capture settings, see section 3rd 3.2.2.