Raster Snap Tab (Drafting Settings Dialog Box)

Use this tab to turn Raster Snap on or off and to control its behavior.

You can use the raster snap modes to help you trace a bitonal raster entity with the vectorization tools, to help you select raster objects for rubbing and cropping, and to help you select raster objects for Raster Entity Manipulation.

Raster Snap Modes

Snap modes determine where your cursor will snap to as you move it around the image. If you choose more than one snap mode, then the crosshairs snap to the closest snap points. When the crosshairs snap to a point you want to select, pick the point.

Center

Snaps to the center of a raster line. The entire width of the line must be in the aperture (snap window).

End

Snaps to the end of a raster line.

Note: When a line ends where it intersects another line, this is considered an intersection, not an end point.

Corner

Snaps to the intersection of two lines.

Intersection

Snaps to the intersection of three or more raster lines. The entire intersection must be in the snap window.

Edge

Snaps to the edge of a raster line. Any part of the raster line can be in the snap window.

Preferences

Show Aperture

Displays the aperture while using raster snap.

Aperture Size

Specifies a size for the aperture in pixels. The maximum size is 300 pixels. Where raster entities are close together, a large aperture can make it difficult to select specific entities when several entities are inside the aperture.

Note: Aperture is defined in image pixels, not screen pixels, so the size of the aperture changes with the zoom level. Therefore, if you are at the extents of an image and the aperture is 10 pixels, the window may appear small. However, if you zoom in, the same aperture appears larger.

Raster Snap Overrides

When Raster Snap is active, it takes priority over any cursor control mode selected here.

Snap

Raster Snap overrides the AutoCAD SNAP command.

Polar Tracking

Raster Snap overrides the AutoCAD Polar Tracking feature.

Ortho

Raster Snap overrides the AutoCAD ORTHO command.

Options

Displays the Drafting tab on the AutoCAD Options dialog box. In this dialog box, you can define your AutoSnap Marker Size and your Aperture Size.

See AutoCAD Help for further information about the AutoCAD Options dialog box.