![]() Of course, construction of points shall also be memorized like point P8 is the intersection of line 元 and circle C3: and if there are two of them, it is the nextmost to the first endpoint of 元 and so on.Īll these relations shall be recorded when the geometrical construction is carried out. length LL5 (of L5 with endpoint PL5a and PL5e) is twice length LL1, radius RC3 of circle C3 (with center CC3) is equal to 1.5 times LL1+L元, L1 and 元 are parallel, the angle between 元 and L4 is 45° and so on). Of course the program shall be able to group entities in order to move, mirror, translate them as the whole group.įor this purpose, the parameters of the initial construction must have associated names and also it must be possible to define relations between them (points Px, Lines Lx, Circles Cx, Angles Ax and so on: e.g. define lengths in terms of other lengths differently and so on). stop the reconstruction in that step and give a message why the construction can't be completed and give the user a chance to edit the relations (e.g. ![]() In such cases, the program should point out the "critical conditions". ![]() if two circles don't intersect any more or such that their intersection points used in further construction steps become undefined, or if two lines which initially had an angle between them don't intersect any more because they become parallel, so that their intersection point used in the further construction does no longer exist). Of course, if to many lengths are given with fixed values rather than relations of other lengths, the geometrical construction may break (e.g. The CAD program shall be able to reproduce the whole geometrical construction in the same way, as the original one, but with varied numerical parameters. The CAD program shall record all the steps in the geometrical construction (which means it must keep track on the relations of endpoints, centers of circles and their radii, intersection/tangent points, parallelism and so on used in the construction). I am looking for a 2D CAD program where I can use variable lengths: All geometrical elements will be given initial numerical values, but the values may change later.
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