Snap options let you select or deselect where Designer places snap points on an object. Snapping is based on the ruler units: if you change the number of snaps per ruler unit, you also change the number of snap points and the appearance of the on-screen grid. By default, the number of snaps per unit is the same as the standard ruler divisions. For example, an inch has 16 snaps, and a centimeter has ten snaps.
The number of snaps per ruler unit can be changed on the Rulers tab of the Options dialog box. The rulers adjust to correspond to the number of snaps per unit. For example, a centimeter with five snaps per unit displays five unit marks in the ruler.
Snapping to the ruler causes the mouse pointer to attract to the closest ruler intersection. If used in conjunction with Dragging Snap, an object's bounding box snaps to the closest ruler increment as you move it.
Guides are nonprinting horizontal and vertical reference lines that you can drag from the ruler. By turning on Snap to Guides, you can make nearby guidelines attract the mouse pointer as you draw an object. if used in conjunction with Dragging Snap, an object's bounding box snaps to the closest guide line as you move it.
Select the Dragging Snap option to cause an object's bounding box, rather than the mouse pointer, to snap to the rulers or guides when you are moving (dragging) the object. When Dragging Snap is selected, the mouse pointer will continue to snap to rulers or guides when drawing an object (if Snap to Ruler or Snap to Guides is currently selected).
Dragging Snap has no effect on object movement if Snap to Ruler and/or Snap to Guides is off, one of these must be selected to activate the Dragging Snap functionality.
Select the Dynamic Snap option to display dynamic snap points on an object when drawing.
Dynamic snap points show up as blue circles on an existing object when you are drawing another object. When you are close to a snap point, it becomes solid and is the point that will be snapped to. Dynamic snap points are attached to the object and move with it.
Dynamic snaps always appear when you are drawing sticky lines, dimension lines, or callout lines.