Intersection

DRAW Reference Manual

Point and Line Construction : Intersection

Here, a point is constructed which is at the intersection of two primitives. The primitives should be chosen from STRA, ARC, or CIRC, although line-parts of more complex primitives may be identified by cursor. An ellipse (ELLI) is also an allowable primitive, but it is only possible to calculate the intersection point between an ellipse and a straight line. A qualifying point may also be specified when there is more than one point of intersection (Refer to Endpoint Position for further information).

1.

INT @

This variation uses a single cursor hit to pick the intersection point explicitly.

2.

INT BETW @ @

This constructs a point at the intersection of two hit primitives:

3.

INT BETW @ @

In this case the second cursor hit acts as a qualifier:

4.

INT /CIRC1 AND /STRA1 QUAL X100 Y100

Here, the intersection point is the one closest to (X100, Y100)

5.

NEW STRA
FPT INT BETW PREV ARC AND PREV CIRC QUAL X200 Y300
TPT MIDP OF PREV STRA

Here, the STRA has one endpoint defined as that intersection between the specified arc and the specified circle which is the nearest to the qualifying point, the other endpoint being the midpoint of a specified line.

Figure 19:11.

Use of the INTERSECTION BETWEEN Construction

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