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Using the same method, copy both blocks twice more to the right. Select both blocks,

call up the Duplicate dialog, and use placement values of 30 mm (X) and 0 mm (Y).

Your drawing should look similar to Figure 219.

Figure 219: The blocks after duplication

For the INVERTER or NOT gate the connection leads must be amended. Move one

input and one output lead to the middle of the block and delete the superfluous input

lead.

Draw the missing circle for negation with a diameter of 2 mm, place it by eye in the

center and then position it and dimension the connections from the Position and Size

dialog as described above.

You can copy the circle to the Clipboard and then paste it as many times as you need,

positioning it and adjusting the lead lengths as above.

A wiring diagram also needs a symbol to show a connection point. Draw a filled circle

for this.

Next add text to the symbols (&, =1 etc.). Activate the icon on the Options

Toolbar. Double-clicking a symbol will now put you in a special text input mode. This

integrates the text as an element in the object (see also Chapter 2 of this guide). You

will find the OR symbol (≤) in the list of special characters (Insert > Special

Characters).

It is probably a good idea to create a group for each type of gate. This will make it

easier to use them in a diagram. Your diagram should now resemble Figure 215; save

it to disk.

If you want, you can add a name to each of the gate symbols (AND, OR ...). Use a

separate layer to add this text so that you can switch it off when necessary.

You can place glue points at the end of each connection lead. This will simplify the

actual “wiring up” later when you add in the connectors.

Setting glue points

This instruction assumes a basic knowledge of connectors and glue points. For

additional information refer to Chapters 2, 8, and 9 of this guide.

Note

If objects are included in a group, it is not possible in Draw 3.3 or

earlier to add glue points to them; glue points must be set before any

grouping is done. This will change in Draw 3.4.

The glue points on the connection leads must be placed exactly at the ends of the

lines (otherwise the wires will not be properly aligned). Unfortunately you cannot set

the position of glue points using numerical values. It is necessary to do it by hand.

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