SYMBOL

Purpose:

To enable a user to change the properties on an existing symbol within a display.

Instructions:

1. On selecting this function the user is presented with a multiple choice Change Symbol box enabling him to change either the height or the rotation angle of a symbol, or to, if so required, to change an existing symbol to a wholly different one from within the set of standard symbols that are available in the overall project environment.

2. Depending on the selection that the user makes, he is presented with another dialog box in which to enter further data, as described below under Options.

3. When the input of the relevant change information has been completed, the user then selects, on the screen and with the cursor, the symbol that is to be changed and then followed by clicking the left-hand button.

Options:

The alternatives available to the user are Height, Rotation, and Symbol.

Height

The system presents the user with a Change Symbol Height dialog box. This provides the user with four means whereby the height of a symbol can be changed, namely 'Standard', 'Key- in', 'Same-as' and 'Two positions'.

The selection of 'Standard' means that a subsequently selected symbol is to be changed back to the originally programmed standard size. If the user selects 'Key-in' the system presents him with a simple box in which he is required to key-in the numeric value of the dimension to be used for the height symbol.

The selection of 'Same as' requires that the user, with the cursor, identifies the symbol that is to be used to redefine the height of the symbol that is to be subsequently modified.

If the user selects the 'Two positions' option, then with the aid of the cursor and at any convenient location on the screen, he is required to graphically indicate the required height of the symbol. Position the cursor and click the left-hand button. Drag the cursor to a new position, with the system drawing a line from the first position to the current position of the cursor as an aid to the user, until a point is reached that is considered to be sufficient to establish the height of the symbol and then again click the left-hand button.

It is to be noted that however the height is changed, using any of the above actions, that the overall proportions of the symbol remain unchanged.

Rotation

The system presents the user with a Change Symbol Rotation dialog box. This provides the user with four means whereby the height of a symbol can be changed, namely 'Standard', 'Key- in', 'Same-as' and 'Two positions'.

The inputs from the user for each of these actions are very similar to the corresponding 'Change Symbol Height' actions.

Symbol

The system presents the user with a Symbol Selection dialog box. By changing the Font number, using the simple drop-down list, and horizontally scrolling through the range of alternative symbols that are associated with each font number, the user can interactively search for and find the symbol that he requires.

With the cursor select the required symbol and click the Left-hand button on the mouse. The system responds by drawing a box around the selected symbol. If the required symbol has been 'seen' by the system, the user must then click the OK key in the dialog box.

Result:

Symbols are changed according to User requirements.