The page with the text document has the background property set to transparent. If
you change the background color of the OLE object in Edit mode, it will also show in
the Draw document.
The Format menu has the entries Area and Line grayed out because they are not
usable, but the menu entries Paragraph, Character, Text, and Bullets and Numbering
are all available. These relate not to the text object which you are currently editing
but rather to a separate independent text element within the object, which you can
open by pressing F2. (This is similar to the way that pictures are linked with an OLE
object.) The double-click, which opens the text element in images, does not work here
because it puts you into the OLE object’s edit mode. Whether it makes sense to use a
text element within text like this is questionable!
Guide to Bézier curves
Bézier curves—what are they?
OpenOffice.org uses cubic Bézier curves. A curve is defined
by means of a start point P
0
, an end point P
3
, and two
control points P
1
and P
2
(see the figure at left). For points
on the curve the terms nodes or anchors are often used.
For the mathematical background of Bézier curves, see
http://en.wikipedia.org/wiki/Bezier_curve.
Bézier curves are very useful for experimenting with the shape and form of curves. In
point mode you can change the curve alignment by dragging the points with the
mouse. The curve leaves the starting point P
0
in the direction of the control point P
1
and arrives at the end point P
3
from the direction of the control point P
2
. These
directions are shown in Draw by blue lines. The more distant a control is from its
starting or end point the smaller the curvature at that point. If a control point lies
directly on one of these points, it has no influence on the curve.
Chapter 10 Advanced Draw Techniques 195
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