
Figure 10 -
Asymmetrical
Tangent
Figure 11 - Inflexion
Point
Figure 12 - Moving a junction
point
Editing Objects Part I
The button lets you separate the lengths of the two parts of
a tangent. In the drawing opposite, you can clearly see that the
curve is flatter on the longest side of the tangent. This kind of
tangent is known as a smooth junction. This button is not to
be confused with the preceding one, since their
representations are fairly similar.
It is also possible to completely detach both sides of the
tangent. In this case, the central point is known as the
inflexion point. Using this technique, you can draw spikes and
troughs in objects. Use the button to create an inflexion
point around the selected point.
Examples
The following examples start from a filled circle. As mentioned earlier, in order to use the
Edit Points mode, you need to convert the object to a curve. This can be done on the selected
object by clicking the right mouse button or by choosing Modify >Convert > To Curve
from the Menu Bar.
You will notice that after conversion, the handles located in the corners of the rectangle have
disappeared. This behavior is normal in that the handles which are used in Edit Points mode
are located along the trace of the drawn object.
The Move Points mode is the default mode when editing
points. If it hasn't been activated, click on the button. When
this mode is active, the mouse cursor has the following shape
when it is hovered over an edit point:
Movement of the junction point is one of the easiest
manipulations to do. The drawing opposite illustrates how an
egg can be drawn very easily by starting from a circle and
dragging the the top edit point upwards.
Draw Guide 31
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