Object Creation/Modification/Removal

ADD/DELETE ARROWS

Add or delete arrow heads for POLYLINE, POLYGON, SPLINE or CLOSED SPLINE objects (points of a BOX can not be added or deleted).

ADD/DELETE POINTS

Add or delete points for POLYLINE, POLYGON, SPLINE or CLOSED SPLINE objects (points of a BOX can not be added or deleted).

ARC

Create an arc. Specify three points using the left button.

BOX

Create rectangular boxes. Start with the left button and terminate with the right button.

BREAK COMPOUND

Break a compound object to allow manipulation of its component parts. Click the left button on the bounding box of the compound object.

CIRCLE

Create cirs by specifying their radii or diameters. Click the left button on the canvas window, move the cursor until the desired radius or diameter is reached, then click the middle button to terminate. The circle will be drawn after the pressing of the middle button.

CLOSED INTERPOLATED SPLINE

Create closed or periodic splines. The function is similar to POLYGON except that a closed interpolated spline is drawn. The spline will pass through the points (knots).

CLOSED SPLINE

Create closed or periodic spline objects. The function is similar to POLYGON except that a closed spline will be drawn instead of polygon. The entered points are just control points; i.e., the spline will not pass any of these points.

COPY

Copy object. Click the left button over part of the object to be copied (for CIRCLE and ELLIPSE objects, position on their circumferences). Drag the object to the desired position and click the middle button. This function as well as the following three functions (MOVE, MOVE POINT, REMOVE) will cause point markers (manipulation aids) to be shown on the canvas window. There are no markers for CIRCLE or ELLIPSE objects.

ELLIPSE

Create ellipses using the same procedure as for the drawing of circles.

GLUE

Glue the objects within a bounding box into a compound object (the bounding box itself is not part of the figure; it is a visual aid for manipulating the compound).

INTERPOLATED SPLINE

Create (cubic spline) spline objects. Enter control vectors in the same way as for creation of a POLYLINE object. At least three points (two control vectors) must be entered. The spline will pass through the entered points.

MOVE

Move objects in the same way as in COPY.

MOVE POINT

Modify the position of points of POLYLINE, BOX, POLYGON, ELLIPSE, ARC and SPLINE objects. Click the left button over the desired point, reposition the point, and click the middle button. Note that BOX and POLYGON objects are internally stored as POLYLINE objects, and therefore moving certain points may open these objects.

POLYGON

Same as POLYLINE except that a line segment is drawn connecting the first and last points entered.

POLYLINE

Create polylines (line segments connecting a sequence of points). Enter points by clicking the left button at the desired positions on the canvas window. Click the middle button to terminate.

REMOVE

Remove (or delete) objects.

SCALE COMPOUND

Only compound objects can be scaled. Click the left button on a corner of the bounding box, stretch the bounding box to the desired size, and click the middle button. Or click the left button on a side of the bounding box, stretch that side to the desired size, and click the middle button.

SPLINE

Create (quadratic spline) spline objects. Enter control vectors in the same way as for creation of a POLYLINE object. At least three points (two control vectors) must be entered. The spline will pass only the two end points.

TEXT

Create text strings. Click the left button at the desired position on the canvas window, then enter text from the keyboard. A DEL or <Ctrl>-<H> (backspace) will delete a character, while a <Ctrl>-<U> will kill the entire line. Terminate by clicking the middle button or typing the return key. To edit text, click on an existing text string with the left button. Insertion of characters will take place at that point.

TURN

Turn POLYGON into a CLOSED INTERPOLATED SPLINE object, or turn POLYLINE into a INTERPOLATED SPLINE object.