Groups of 2D objects
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object2d1, object2d2, …, <
a = amin .. amax>,
plot::Group2d forms a group of any number
of graphical 2D objects.
Grouping together a larger number of graphical objects and accessing the group as a whole simplifies their handling. In particular, the main purpose of a group is to inherit graphical attributes that are shared by all members of the group.
To change the inherited attributes interactively, do not select the group itself in the interactive object browser of the MuPAD® graphics tool (see Viewer, Browser, and Inspector: Interactive Manipulation). Underneath the group object, find 'defaults' branches for the objects in the group. Select the 'defaults' branch for the object type that you want to set attributes for.
A group can contain groups.
When working with groups of points, the more efficient approach
is to use the specialized grouping construct
plot::PointList2d instead of generic
groups of points.
Consider a group
G1 consisting of two triangles
inscribed in an ellipse. Form a new group
of the group
G1, the ellipse and its focal points.
The entire figure given by the group
G2 is rotated
by an animated
G1 := plot::Group2d( plot::Polygon2d([[0, -1], [0, 1], [-2, 0]]), plot::Polygon2d([[0, -1], [0, 1], [ 2, 0]]), Closed = TRUE, Filled = TRUE, Color = RGB::Blue): G2 := plot::Group2d( G1, plot::Ellipse2d(2, 1,[0, 0]), plot::PointList2d([[-sqrt(3), 0], [sqrt(3), 0]]), PointSize = 2*unit::mm, PointColor = RGB::Red, LineColor = RGB::Black): plot(plot::Rotate2d(a, [0, 0], a = 0..2*PI, G2))
delete G1, G2:
Graphical 2D objects