(I have had this draft sitting in the blog for a couple of years with the intention of making a quick demo video... but it's not gonna happen. I'll publish it now as, if nothing else, it is a nice and simple DDD example)
Download the following DGN file which includes a simple arc calculator to determine:
Any Two Parameters must be known - and the rest will be returned real-time on-screen.
The Arc (solution) can be re-located using the Modify and Re-Solve Constraints Tool on the Right-Angled Arrow ‘Handles'.
For more information about Dimension Driven Design Solutions, see my previous Blog Post.
DGN Download
Colin,
I have avidly watched all your video demonstrations on DDD and really appreciate all your effort and instruction, it has helped me out in determining much of what Bentley has neglected to include on their Learn Server... i was slightly disturbed by one of your Equations, and found this Arc Calculator to contain the same formula... in your video you admit you don't have a knack for math... the formula you use to calculate the length of an arc is incorrect... the correct formula for LengthofArc is L=R*2*pi*(A/360) where L is Length of arc, R is Radius of Arc and A is AngleSubtended... this can be proven by the formula for the Circumference of a circle and applied to an arc.. C=D*pi or C=R*2*pi.. the angle is a fraction of the total angle of a circle A/360 since there are 360 degrees in a full circle and you need to equate the angle length to the fraction of the whole circle which the arc spans.
Thanks again for your instructional videos, please let me know if you update this Arc Calculator
Brent James