add objects

This menu is for introducing new points and lines to a vector image. It includes a variety of routines for generating smooth lines and geometric shapes. For all of the options other than DRAW LINES, the software uses the Vertex spacing menu field to figure out how far apart to put the vertices of the shape you are creating. You should enter the spacing before you start creating shapes.

DRAW LINES lets you create new lines in any shape. You just specify the sequence of vertices.
DRAW SMOOTH LINES lets you create smoothed lines. The interface is like DRAW LINES, but the vertices are spaced at intervals on a spline that connects all the vertices you specify.
DRAW CIRCLE BY RADIUS lets you create a circle by first specifying the center, then specifying a point on the circumference. As you specify the second defining point of a circle, the radius of the circle is displayed on the menu in real time.
DRAW CIRCLE BY DIAMETER lets you create a circle by specifying two points that define the circle's diameter. As you specify the second defining point of a circle, the diameter of the circle is displayed on the menu in real time.
DRAW ARC lets you create circular arcs. You first specify the endpoints of the arc, then a point on the arc. The radius of the arc is displayed in real time once the endpoints have been specified.
DRAW ELLIPSE lets you create ellipses. You first specify the endpoints of the major axis, then specify a third point that determines the flatness of the ellipse. After you define the major axis, the minor axis is displayed on the menu in real time. Note that, by convention, the major axis of an ellipse is the longest of the two axes, but for purposes of displaying axes on the menu, the major axis will always be the one specified by your first two clicks.

Both this menu and the Add Vectors menu have a mechanism for specifying the position of a click precisely in the image coordinate system. To use this feature when you are asked to click somewhere, just enter X and Y values and click on USE KEYIN VALUES. Note that the values you enter relate to the vector image, not the background image, if any. Thus, they may not correspond to the coordinates that appear when you move the pointer across the display.