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Chapter 6: Creating Drawings with Draw
Combining Objects and Constructing Shapes
In Draw and Impress graphic objects may be combined in different ways. Several single
objects can be brought together to create new objects by using Boolean set operators on the
original geometry.
Combining Objects
1. Select several objects.
2. Choose Combine from the context menu.
In contrast to groups, which consist of single objects, a combination fuses the component
objects into one single new geometric object with its own new properties. The combination
may be undone again later, but the individual objects may not be recoverable.
The user should recognize the property that stands out the most in a combination when the
individual objects overlap. In this case, the combination is the result of the Boolean/logical
operator XOR, and shapes, discussed later, are other logical combinations. The areas of
overlap are the ones which stand out the most in a combination, as they will be converted into
“holes”.
In the illustration, several objects are shown to the left as they are before being combined,
and at the right after being combined. The combination is given the attributes of the object
farthest to the back (i.e. undermost object).
Constructing Shapes
The commands Shapes > Merge, Subtract and Intersect also form a new geometric object
out of the original objects. The new object comes into being through the use of logical
amount operators (boolean O) on the source geometries.
1. Select several objects.
2. Choose Shapes from the context menu. In the submenu, choose Merge, Subtract or
Intersect.
In the following illustrations the original shapes are shown on the left and the result on the
right.
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