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Drawing to scale

Draw is not a CAD (computer-aided design) program but a graphics program with

which you can produce drawings to scale. The example used for this chapter is a

drawing of a Logic Circuit Diagram. The exact meaning of the individual symbols is

not described here as we are only interested in the drawing techniques used to

produce the diagram.

The logic symbols in Figure 215 form the building block library for our scale drawing.

Figure 215: Logic Symbol library

Working with the Position and Size dialog

To ensure that the edges of the building block symbols do not coincide with the

wiring, they should be 8 mm wide and 8 mm high. The connections to the symbols

should have a length and separation of at least 5 mm. These values are somewhat

arbitrary and you can substitute values that suit your own needs.

For the drawing we used a measurement unit of millimeters, a grid spacing of 5 mm,

and a grid subdivision of 4 points. In addition you should probably activate Display

grid and Guides when moving as well as Snap to grid (see Chapter 8). This drawing

will serve later as a collection of available symbols, so you should not only draw the

symbols but fully detail them as well.

The first step is to draw a base element, an AND gate block. You can then dimension

and detail this element (use the Position and Size dialog, as shown in Figure 216;

double-click on the status bar or context menu to help with dimensioning). For this

example, the left upper corner of the block is at x=10 mm and y=5 mm.

Figure 216: Positioning and dimensioning a Draw object

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OpenOffice.org OpenOffice - 3.3 Guía de usuario Pagina 172