20.5 Reference: Sample Sheets

We describe some of the sheets that are supplied with dia. For each we list the collection of shapes (objects) provided and give an example diagram made from the shapes. The specification of each sheet is an XML document usually located in /usr/share/dia/sheets/.

20.5.1 Chronogram

The Chronogram sheet contains just two shapes, but with functionality that allows a considerable variety. %

20.5.2 Circuit

The Circuit sheet contains shapes useful for drawing electrical and electronic circuit diagrams. The sheet includes, in order, a Vertical Resistor, Horizontal Inductor, Vertical Inductor, and a Horizontal Resistor as the first row with their European counterparts as the second row. Then Horizontal and Vertical Capacitors, npn and pnp Bipolar Transistors, Horizontal and Vertical Diodes and Zener Diodes, Ground Point, Operational Amplifier, Horizontal and Vertical Fuses and Power Sources, Lamp, Speaker, Horizontal and Vertical LEDs, NMOS and PMOS Transistors, and a Horizontal Jumper. % All objects have object defaults accessible by double clicking the left mouse button on the corresponding object within the sheet. In general you can set the default text padding, alignment, font, and font size for each object.

20.5.3 ER

Entity-relationship diagrams are commonly used to design relational databases. The basic elements of an ER diagram are provided, including an Entity, Weak Entity, Relationship, Attribute, and Participation. %

20.5.4 Flowchart

The Flowchart sheet provides the diagram elements usually associated with drawing flowcharts of all types. All elements allow text to be included and the object properties can be used to set the fonts and for boxes to set the corner rounding. The elements supplied are a Box, Parallelogram, Diamond, Ellipse, Display, Transaction File, Off Page Connector, Document, Manual Operation, Preparation, Manual % Input, Predefined Process, Terminal, Magnetic Disk, Magnetic Drum, Magnetic Tape, Internal Storage, Merge, Extract, Delay, Summing Junction, Collate, Sort, Or, Punched Card, Punched Tape, Transmittal Tape, and Offline Storage.

20.5.5 FS

The FS sheet provides support for Function Structure Diagrams. There are three shapes: A Flow, an Orthogonal Polyline Flow, and a Function.

The Flows have object defaults where default labels (text) and flow types can be identified. These can also be changed by double clicking a Flow or Orthogonal Polyline Flow object on your canvas. The different flow types (Energy, Material, and Signal) change the properties (colour and type) of the line. The text label can be grabbed by the mouse and moved around.

The Function object is a box with a text label. It has object properties with which the Function can be identified as a Wish Function and/or a User Function. A Wish Function has a dotted box and a User Function has a double box.

A sample of the Function Structure (FS) Diagram sheet objects. This is not a true function structure diagram, but does illustrate the variety of shapes. {#fig:dia-sheet-fs-sample}

20.5.6 GRAFCET

GRAFCET charts have been standardised outside of France as Sequential Function Charts (IEC848). THey are often used to describe the mandated behaviour of sequential automates. They are in fact an offspring of Petri nets but oriented towards specification of actions % and mandated evolutions rather than simple descriptions of state and possible evolutions.

The supplied shapes of the GRAFCET sheet include a Regular Step, Initial Step, Macro Entry Step, Macro Exit Step, Macro Call Step, Macro Sub-Program Call Step. These are essentially variations of the same shape and one can be changed to another by editing the object properties. Next are an Action, Condition, Transition, OR Vergent, AND Vergent, and an Arc. The first nine shapes have object defaults for setting the font, font size and pen colour. The Arc can have arrow heads.

20.5.7 Ladder

Ladders are used as a pseudo-electric representation of boolean expressions. They are used by some vendors of industrial automats (including Schneider/T'el'em'ecanique and Siemens). %

20.5.8 Network Diagrams

Network diagrams include local area networks (LANs) and wide area networks (WANs). The Network sheet provides a collection of shapes often used in network diagrams. The sheet includes, in order, a % Computer, Monitor, Storage, Ethernet Bus, Printer, WAN Connection, Hub, Modular Switch, RJ45 Wall-Plug, scEAD Wall-Plug, Modem, Antenna (for wireless transmission), Network Cloud, Router Symbol, Switch Symbol, and an ATM Switch Symbol.

20.5.9 Pneumatic/Hydraulic

The Pneumatic/Hydraulic sheet provides tools to draw pneumatic and hydraulic schematics. It is a very incomplete sheet, and there are some tricks to using distributors properly. %

20.5.10 SADT

SADT stands for Structured Analysis and Design Technique which is a trademarked and copyrighted by Softech Inc. A SADT model is a collection of diagrams organised in a tree structure. Each SADT % diagram is composed of Boxes (representing activities) connected by Flows (arrows) representing flows of materials, data or information.

The SADT sheet provides the three basic components required for drawing SADT diagrams: Activity/Data Flow, Activity/Data box, and Flow Annotation. The activity/data flow can be one of several styles, including Normal, Import Resource, Imply Resource, Dotted Arrow, or with Disabled Arrows. The default is Normal but can be changed in the Object Defaults window (double click the Activity/Data Flow button).

A sample of the SADT digram objects. {#fig:dia-sheet-sadt-sample}

Flows have different roles in relation to the activities. The middle mouse button (or control right click on Windows) is used to add or remove segments.

The default flow is Vertical-Horizontal-Vertical. It is sometimes useful to do a bit of middle mouse button clicking to build a Horizontal-Vertical-Horizontal variant which can then serve for copy-and-paste in your diagram. A non Vertical-Horizontal-Vertical flow will be shown in black instead of the default grey. While this is not in the original SADT specification it is often handy to untangle a heavily loaded sheet (with more than 4 or 5 functions—though these sheets should be avoided).

Connections points can be added to or removed from the sides of an SADT box by clicking the middle mouse button. Function identifier (A0, A1, etc.) can be changed by opening the box properties. The associated function (the contents of the box) is changed by simply selecting the box and typing any text.

20.5.11 Sybase

The Sybase sheet provides various objects for the design of Sybase replication domain diagrams. The sheet includes a Dataserver, % Replication Server, Log Transfer Manager or Rep Agent, Stable Storage Device, Client Application, and a Replication Server Manager.

20.5.12 UML

Support for the Universal Modelling Language (UML) includes all of the static structure diagram elements specified in the UML specifications. The sheet includes, in order, a Class, Template Class, Note, Dependency, Realization (implements a specific interface), % Generalisation (class inheritance), Association, Aggregation (one class is part of another), Implements (class implements a specific interface), Constraint, Small Package, Large Package, Actor, Usecase, Lifeline, Object, Message, Component, Node, Class Stereotype Icon, State Machine, and a Branch.

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