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Transition points

For the transition from one segment to the next, there are three different types of

points, each with its own properties.

Corner points

This is the only common point between two segments which are otherwise

independent of each other. It is likely that the curve has a kink at this point

(depending on the angle of the tangents, the lines from the corner point to each

control point; see Figure 242).

Figure 242: Corner point

Smooth transition points

The tangent lines to the common point have the same angle and form a straight line.

If you change the position of one of the control points the other also moves, so that

the tangents remain in a straight line. This also applies to the case where a Bézier

curve meets a straight line: the tangent line lies on the straight line and cannot be

moved sideways.

Figure 243: Smooth transition point

Symmetric transition points

In this case the tangents not only lie on a straight line but the distance of the control

points from the curve point is the same. The segments have the same direction and

the same curvature at the transition point.

Figure 244: Symmetric transition point

Changing point types

When a point is selected, the Edit Points toolbar activates the three corner point

icons (circled in the illustration below).

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