Draw arc between two points with fixed radius

JakeJake Global Mapper UserPosts: 269Trusted User
edited January 2012 in Vector Data
Is there a way to draw an arc between two fixed points with a predetermined radius?

A rather lengthy alternative is, I draw a range ring around the two points and determine the two intersection points. Then use the correct intersection point to generate another range ring, convert to a line, split line at point of tangency and keep only the portion running between the two points.

Comments

  • global_mapperglobal_mapper Administrator Posts: 17,238
    edited January 2012
    Yes if you select the Digitizer Tool, then right-click and select the option to create an area or line shape and choose arc, you can then specify the start and end angle of the arc and either manually draw the arc or just specify the radius directly there.

    Let me know if I can be of further assistance.

    Thanks,

    Mike
    Global Mapper Guru
    gmsupport@bluemarblegeo.com
    http://www.globalmapper.com
  • JakeJake Global Mapper User Posts: 269Trusted User
    edited January 2012
    Thanks. Unfortunately in the scenario I am describing you don't have the start and end angles nor the origin. You could calculate them with the intersect and measure tool but it is quite a few extra steps and then you have to ensure the vector intersects the point.

    To illustrate what I am talking about take a look at the AutoCAD function. It is the 7th function listed on the right.

    http://docs.autodesk.com/ACD/2010/ENU/AutoCAD%202010%20User%20Documentation/files/WS1a9193826455f5ffa23ce210c4a30acaf-6f60.htm
    You can create an arc using a start point, endpoint, and a radius.
    The direction of the bulge of the arc is determined by the order in which you specify its endpoints.

    Ideally I would select two points and CREATE ARC LINE dialog would pop up. You could have the option of entering a radius or picking a 3rd point on the screen.

    Highway curves are an example where you know the design radius of a curve and you have the coordinates of two points on said curve. I am using it for layout but not a highway.
  • global_mapperglobal_mapper Administrator Posts: 17,238
    edited January 2012
    Ah I see what you are saying. There is not currently a way to do this, but I have added a todo item to our list and linked it to this thread, so when we add this we'll update this thread with a link to the new build.

    Thanks,

    Mike
    Global Mapper Guru
    gmsupport@bluemarblegeo.com
    http://www.globalmapper.com
  • JakeJake Global Mapper User Posts: 269Trusted User
    edited January 2012
    Thank you. This assumes a 2D curve.
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