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  1. #1
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    Question Construct an Ellipse from it Focal Points and Height

    To understand this Challenge, you need to be aware of http://www.xara.com/templates/: the triangle made between the centre, the minor axis (top) apex and a focal point has its longest side the same length as from the centre to a major axis (side) apex.

    Given a focal length and a height of both 400px, re-construct the ellipse.

    Click image for larger version. 

Name:	Ellipse.png 
Views:	128 
Size:	17.3 KB 
ID:	122810

    Acorn
    Acorn - installed Xara software: Cloud+/Pro+ and most others back through time (to CC's Artworks). Contact for technical remediation/consultancy for your web designs.
    When we provide assistance, your responses are valuable as they benefit the community. TG Nuggets you might like. Report faults: Xara Cloud+/Pro+/Magix Legacy; Xara KB & Chat

  2. #2
    Join Date
    Nov 2018
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    Default Re: Construct an Ellipse from it Focal Points and Height

    I'll wait a bit...

  3. #3
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    Default Re: Construct an Ellipse from it Focal Points and Height

    I can feel the tension building.

    Acorn
    Acorn - installed Xara software: Cloud+/Pro+ and most others back through time (to CC's Artworks). Contact for technical remediation/consultancy for your web designs.
    When we provide assistance, your responses are valuable as they benefit the community. TG Nuggets you might like. Report faults: Xara Cloud+/Pro+/Magix Legacy; Xara KB & Chat

  4. #4
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    Default Re: Construct an Ellipse from it Focal Points and Height

    Quote Originally Posted by Acorn View Post
    I can feel the tension building.

    Acorn
    ok, here is mine...

    Click image for larger version. 

Name:	ellipse_FPH.png 
Views:	123 
Size:	9.2 KB 
ID:	122822

    Of course you can use the same triangle. You rotate it first then create the circle and than stretch it horizontally while pressing the SHIFT key to get the ellipse.
    Last edited by Marco D; 05 December 2018 at 04:19 PM.

  5. #5
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    Info Re: Construct an Ellipse from it Focal Points and Height

    Quote Originally Posted by Marco D View Post
    ok, here is mine...

    Click image for larger version. 

Name:	ellipse_FPH.png 
Views:	123 
Size:	9.2 KB 
ID:	122822
    Marco, i like the elegance of your solution. Thank you.
    There is no need to delete the Node, just use the square and rotate it 45° around the circle's centre.

    I used the square's diagonal to become the circle's radius right off.
    I just then Shift-flattened the circle into the height of the square.

    Click image for larger version. 

Name:	Ellipse construction.png 
Views:	120 
Size:	15.9 KB 
ID:	122824

    Both solutions will work for any focal length and minor axis.

    Acorn
    Acorn - installed Xara software: Cloud+/Pro+ and most others back through time (to CC's Artworks). Contact for technical remediation/consultancy for your web designs.
    When we provide assistance, your responses are valuable as they benefit the community. TG Nuggets you might like. Report faults: Xara Cloud+/Pro+/Magix Legacy; Xara KB & Chat

  6. #6
    Join Date
    Nov 2018
    Location
    Italy
    Posts
    111

    Default Re: Construct an Ellipse from it Focal Points and Height

    Yes, of course, I made it triangular because of the image you posted.
    As you said there is no need to cancel the node.
    But your solution is even faster.
    Marco.

 

 

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