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LibreOffice Draw 4.3 Manual

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3) The color bar below the sample color area will show the new color on the left half of the bar
so that you can compare it with the original color on the right half of the bar.
4) If you are satisfied with the color created, click OK to use the color.
5) See “Using color values” on page 225 to save the color.
Deleting colors
1) To delete a color from a color palette, open the color dialog (Figure 256 or Figure 257).
2) Select the color from the Color drop-down list or the color table and click Delete.
3) Click Yes to confirm the deletion of the color.
4) Click OK to close the color dialog.
Bézier curves
In LibreOffice you can use Bézier curves in your drawing. 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
(Figure 259). 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.
Figure 259: Points in Bézier
curves
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
start 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
. The more distant a control is from its start 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.
Drawing Bézier curves
1) Click on the small triangle to the right of the Curve icon on the Drawing toolbar to open
the Lines toolbar (Figure 260). The Curve icon on the Lines toolbar is the last tool selected
on the Lines toolbar. To make this toolbar a floating toolbar, click at the bottom of the pop-
up toolbar and drag it onto the workspace.
2) Click on the Curve icon on the Lines toolbar.
Chapter 11 Advanced Draw Techniques 227
… 227 …


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