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Figure 55:

Inflexion point

Figure 53:

Symmetric

tangent

1 Points 5 Split Curve 9 Symmetric Transition

2 Move Points 6 Convert to Curve 10 Close Bézier

3 Insert Points 7 Corner Point 11 Eliminate Points

4 Delete Points 8 Smooth Transition

Figure 52: Edit Points toolbar

The three kinds of tangent

Three buttons in the Edit Points Toolbar let you select the type of tangent and convert

from one type to another. Only one of these buttons can be active at any given time.

Their use is described in the following chapter.

Choose the Symmetric Transition button to work

with a symmetrical tangent (Figure 53). Any movement of

one or the other of the handles is carried over

symmetrically to the other handle.

Figure 54:

Asymmetric

tangent

Choose the Smooth Transition button to separately

adjust the lengths of the two parts of a tangent and so

make the curve flatter or steeper. In Figure 54, the curve

is flatter on the longest side of the tangent. The tangent

remains as a single straight line. This kind of tangent is

known as a smooth junction.

It is also possible to separate both sides of the tangent

from the curve. In this case, the central point is known as

the inflexion point. Using this technique, you can draw

spikes and troughs in objects. Choose the Corner Point

button to create an inflexion point around the

selected point.

Examples

The other buttons in the Edit Points Toolbar are described here in relation to working

examples. The following examples start from a filled circle. As mentioned earlier, in

order to use Edit Points mode, you first need to convert the object to a curve.

You will notice that after the conversion, the handles located in the corners of the

rectangle have disappeared. This behavior is normal in that the handles which are

used in the Edit Points mode are located along the outline or trace of the drawn

object.

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