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The input and output leads of the INVERTER lie at Y=4.5 cm and Y=6.5 cm. Move the
mouse over a guiding line. When the mouse cursor changes to a double arrow, drag
the guiding line (with the left mouse button pressed) onto the input and output leads
of the block. If the grid snap is still active, this should be exactly positioned without
much effort.
The leads of the AND gate lie 1.5 mm below the upper edges of the two horizontal
guiding lines. They must be moved up for the next step. The Y coordinates are
reduced to 4.35 cm and 6.35 cm (the top edges of the AND gates). When you have
moved the lines, you can drag both AND gates from the Gallery and position them.
Your drawing should now resemble that in Figure 224.
Next drag the horizontal guiding lines again over the input and output of the gates
(Y=4.5/6.5 cm), so that when you position the connection point of the leads (a small
black circle) it will sit exactly on top of the leads from the gates.
Figure 224: Drawing a half adder – Step 2
To position the two last gates, you need to set the following additional guiding lines: a
vertical line with X=11 cm and two horizontal lines (C,D) at Y=5.5 cm and Y=7.5 cm
respectively. Shift the horizontal lines C and D each 1.5mm upwards (so that Y=5.35
cm and Y=7.35 cm).
Drag the OR and the last AND gate from the gallery and position them as in Figure
225.
Figure 225: Drawing a half adder – Step 3
178 OpenOffice.org 3.3 Draw Guide
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