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At first glance, the appearance of the combined objects can seem rather surprising.

However, once you understand the rules governing combination in Draw, it will

become clearer.

• The attributes (for example, area fill) of the resulting object are those of the

object furthest back. In this example, it is the circle.

• Where the objects overlap, the overlapping zone is either filled or empty

depending on the number of overlaps. When the number of overlaps is even,

you get an empty space; when the number is odd, you get a filled area.

Figure 109: Odd numbered overlaps are filled, even numbered

overlaps are empty

Tip

You can reorder objects before combining them so that they are further

back or further forward: right-click on the object and select Arrangement

from the pop-up menu. See also “Aids for positioning objects” on page 83.

An object which is a combination can be broken up again by selecting Modify >

Split or using the keyboard shortcut Control+Alt+Shift+K. The combination can also

be broken up into its constituent parts by selecting Modify > Break. These are not

an exact equivalent to ungrouping, as the objects were converted to Bézier curves

when they were combined. An object which is split will, for example, have an ellipse

converted to a Bézier curve.

A object which is broken will consist of a set of base level objects (for example, a

rectangle will be broken into 4 separate lines) and the original formatting—line

thickness, colors, and area properties—is not retained.

Connecting lines

Lines may be connected by selecting them and using Modify > Connect. The

connections established are based on joining the ends of pairs of lines with minimum

separation. Once a group of lines is connected, you can “close” the remaining gap by

selecting the line, right-clicking and choosing Close Object. The resultant object is

filled with the default fill. If you modified the line properties (color, weight) these are

retained in the resulting polygon.

Merging, subtracting, or intersecting shapes

After you have selected more than one object, the Merge, Subtract, and Intersect

functions can be reached in the Modify > Shapes menu or though the group’s right-

click menu under the heading Shapes.

Chapter 5 Combining Multiple Objects 81

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OpenOffice.org OpenOffice - 3.3 Guía de usuario Pagina 81