There are two cursors active within the Sketcher: the primary cursor and the secondary cursor. The two cursors are shown in Figure 19–4.
The primary cursor is the one you use with most applications on your computer, including ABAQUS/CAE. The primary cursor usually appears as an arrow pointer or a pointing hand; you position this cursor by moving the mouse. The secondary cursor is active only in the Sketcher; it appears near the primary cursor only when the Sketcher prompts you to select a point. The position of the secondary cursor allows you to see exactly which point is selected before committing the selection. If you move the primary cursor near a point that is eligible for selection, the secondary cursor jumps directly to the point while the primary cursor remains fixed. This behavior is called preselection. If you click the mouse button, ABAQUS/CAE selects the point under the secondary cursor.
The appearance of the secondary cursor changes as you move around the sketch. Table 19–3 shows the shape assumed by the secondary cursor when the primary cursor is close to the Sketcher entity listed.
Table 19–3 Preselection cursors.
| Preselection cursor | Sketcher entity |
|---|---|
 | A vertex |
| / | The midpoint of a line or curve |
| × | The intersection of lines and curves |
| ×—— | The projection of a line onto other lines and curves |
| ○ | Points along existing lines or curves |
| + | The intersection of grid lines with each other or with other lines and curves |
Table 19–4 Preselection symbols.
| Preselection symbol | Location and Meaning |
|---|---|
| At the starting point of a new line segment when the line starts on existing sketch, reference, or construction geometry. The new line segment is perpendicular to the existing geometry. |
| ⊥ | Near the secondary cursor when creating a new line. The new line segment is perpendicular to an existing edge at the cursor end. |
| // | Near the / secondary cursor. The preselected point is the midpoint of a line or arc. |
| /O | Near the starting point or near the secondary cursor when creating a new line. The new line segment is tangent to an existing edge; the position of the symbol indicates whether tangency is at the starting point or at the secondary cursor position. |
| H | Near the secondary cursor when creating a new line. The new line segment is horizontal. |
| V | Near the secondary cursor when creating a new line. The new line segment is vertical. |
Preselection applies to any entity that is a valid selection in the sketch. For example, as you move the cursor around the sketch, preselection highlights the following to indicate a valid selection:
Vertices, midpoints, intersections, projections, and points of tangency highlight when you are sketching a line, as shown in Table 19–3.
Circles and arcs highlight when you are adding a radial dimension.
Vertices and vertical lines highlight when you are adding a horizontal dimension.
Dimensions highlight when you are modifying a dimension.
By default, the secondary cursor snaps to grid points that are close to the primary cursor. If you turn off this snapping, the secondary cursor follows the primary cursor and can be positioned anywhere on the Sketcher sheet.
You can turn off preselection.
