Snap Modes > Quadrant (Extra Menu)

The snap modes determine which type of point should be used as a snapping reference. There are various snap modes, some of which can be used together. The snap modes take effect when snapping is active. Snapping can be turned on or off using the F6 Key or the first button in the Panel. It can be temporarily (de)activated during point entry using the SHIFT key.

This snap mode enables quadrant points to be used as snapping references. With circles and circle parts these are the points on the circle which lie at angles of 0°, 90°, 180° and 270° relative to the circle's center. With ellipses, they lie at the four ends of the positive and negative half axes. If snapping is on and this snap mode is active, instead of entering a point, an object is identified whose quadrant points are then worked out.

Any part object in an existing object can be identified as a reference object. This can be the arc of an ellipse or a circle arc within a circle. A line can not be chosen.

The position at which the (part) object was identified (the "ID point") affects the rest of the command. It determines which of the four possible quadrant points is selected. The one nearest to the ID point is always chosen (see below).

After choosing the (part) object all quadrant points are worked out and the one nearest to the ID point is selected. This point is then used like a point entered by hand (see graphic).

Optionally, this snap mode can be turned on or off by left-clicking the button in the panel shown above. In addition the button always shows the snap mode's current status.