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Chapter 6: Creating Drawings with Draw

The curves, that have been drawn using the above steps, are Bézier curves. The points on a

Bézier curve are called data points.

• Each data point on the Bézier curve can be “symmetric”. The curve then has the same

curvature either side of the point.

• Or the data point is “smooth”. The curve then has different curvatures either side of the

point.

• If the curve is not steadily continued at the data point, but instead forms a corner or tip, it

is a corner point. Any type of data point can be converted into any other, thus giving good

control over the shape of the curve.

Note: When precisely linking two existing points in a drawing using lines, click the

Line

icon on the main toolbar

and also activate the

option

bar via View > Toolbars > Option Bar. Select the Snap to Object Points icon on this

toolbar.

Editing Curves

Data points can be edited if they are displayed as small rectangles. To work on a curve later,

when it is no longer selected, click the Edit Points icon on the object bar and select the

curve. If the object bar is not visible, click briefly on Select on the main toolbar:

1. Now click Edit Points on the far left of the object bar or on the option bar.

2. Click once on the point for editing. It will appear as a filled square, and there should be

two Bézier lines with control points at the ends. (Please note that sometimes one of the

control points is directly on top of the Bézier point and thus hard to see.) In the case of

corner points, which define right angles, the control points lie directly on the Bézier point.

Now move the Bézier point and the control points as needed. Note how the curve changes

accordingly. The change in form of the cursor indicates in each case the function that can

be executed.

The object bar contains several icons with which can, among other options, change the

type of the selected point. A detailed explanation of the various options can be found in

Help.

3. To convert the type of data point, select the point. The object bar shows the type of point:

corner point, smooth transition or symmetric transition.

4. Click one of the icons to change the type of point.

Of course, curves can also be edited in the “conventional” manner, i.e., changing width,

colour, and (in the case of a filled curve) the object fill. The options for changing these

attributes are found in the Object bar. If the Edit points icon is not pressed, use the context

menu or the Format and Modify menus.

Also try out the other icons on the Curves floating toolbar. When a filled curve is finished by

double-clicking, it is automatically closed and all “internal areas” are filled.

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OpenOffice.org 2.x Guía de usuario Pagina 354