Graphics Programs Reference
In-Depth Information
3.
Click Pick Points.
4.
Click in the interior of the flange shape. The entire shape is highlighted, including the
circle islands.
5.
Press ↵. You now have a polyline outline of the shape and the circles, although it won't
be obvious that polylines have been created because they're drawn over the boundary
objects.
6.
Continue by using the Measuregeom command's Add and Subtract options. Choose
Tools
Inquiry
Area from the menu bar.
7.
Type
A
↵ to enter Add area mode, and then type
O
↵ to select an object.
8.
Click a vertical edge of the flange outline. You see the selected area highlighted in green,
and the following message appears in the Command Line palette:
Area = 27.7080, Perimeter = 30.8496
Total area = 27.7080
9.
Press ↵ to exit Add area mode.
10.
Type
S
↵ to enter Subtract area mode, and then type
O
↵ to select an object.
11.
Click one of the circles. You see the following message:
Total area = 0.6070, Circumference = 2.7618
Total area = 27.1010
This shows you the area and perimeter of the selected object and a running count of the
total area of the flange outline minus the circle. You also see the area of the subtracted
circle change to a different color so you can differentiate between the calculated area and
the subtracted area.
12.
Click the other circle. You see the following message:
Total area = 0.6070, Perimeter = 2.7618
Total area = 26.4940
Again, you see a listing of the area and perimeter of the selected object along with a run-
ning count of the total area, which now shows a value of 26.4940. This last value is the
true area of the flange.
13.
Press ↵ and type
X
↵
X
↵ to exit the Measuregeom command. You can also press the Esc
key to exit the command.
In this exercise, you first selected the main object outline and then subtracted the island
objects. You don't have to follow this order; you can start by subtracting areas to get negative
area values and then add other areas to come up with a total. You can also alternate between
Add and Subtract modes, in case you forget to add or subtract areas.
