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Point mode of the Bézier curve

After drawing a curve using the icon from the Draw toolbar or with the Edit

points command from the context menu, you can switch to point mode from which

you edit individual points on the curve. Points on the curve are shown with a square

handle ; the control points with a round handle . The starting point of a curve

appears somewhat larger than the other points. When you hover the mouse over a

curve point the mouse cursor changes to - over a control point it changes to .

In point mode the toolbar Edit Points should appear. If not, turn it on from View >

Toolbars > Edit Points.

You can switch on the option All control points in Bézier editor under Tools >

Options > OpenOffice.orgDraw > View. The default is to see the control points

and guide lines only when a point is marked by clicking on it. By holding the Shift key

down as you mark, you can select and mark several points at the same time. A

marked point is shown a little darker .

Drawing a succession of Bézier curves

Several lines or Bézier curves can be linked together. The single parts are referred to

as segments. Technically such a succession of Bézier curves and lines is known as a

path.

Begin the drawing as with a simple Bézier curve. At the end position of the first

segment, end not with a double-click but with one of the following:

• Click on the end point of the first segment but do not keep the mouse button

pressed. In this way you produce a curve point which is a control point for both

segments. This control point lies, however, on an actual curve point and so

does not influence the direction of the following curve segment. Move the

mouse to the end position of the second segment. This segment appears to be

a straight line but is in fact a Bézier curve. Either double-click to finish the

curve or repeat the above procedure to add successive segments.

• Go back and click once on the end point of the first segment and keep the

mouse button pressed. Now you can drag the initial control point for the

second segment into place, as described above. Release the mouse button at

the desired position of the control point and move the mouse to the end

position of the second segment. The curve follows the line of movement of the

mouse.

You can either end the drawing here with a double-click or continue and link in

further segments.

To generate a closed curve, select the curve and click on the Close Bézier icon

on the Edit Points toolbar, or right-click and select Close object from the context

menu.

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OpenOffice.org OpenOffice - 3.3 Guía de usuario Pagina 197