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  1. #1
    Join Date
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    Default How to draw this shape...

    ...Accurately?

    There are probably many ways, but, if you were drawing this shape, then how would you draw it accurately?
    So that, if it was turned/spun around its axis, it would still look exactly the same.
    (Hope I've explained that properly!)
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Featured Artist on Xara Xone . May 2011
    . A Shield . My First Tutorial
    . Bottle Cap . My Second Tutorial on Xara Xone

  2. #2
    Join Date
    Apr 2012
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    Default Re: How to draw this shape...

    Rik, this appears to be a constant breadth rotor of degree 3.
    If it is symmetrical on rotation of 120deg either way then it is a equilateral triangle where the arcs between vertices are circular with a radius of a triangle side.

    The cleanest Xara way I can use is to a create circle.
    Clone this twice more and position so the circumference of one cuts through the centres of the other two.
    Finally select all three overlapping circles and Intersect all shapes.

    The inner part is your shield.

    Acorn
    Last edited by Acorn; 21 September 2018 at 03:56 PM.
    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

  3. #3
    Join Date
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    Placitas, New Mexico, USA
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    Default Re: How to draw this shape...

    I would create one arc using an equilateral triangle for a guide. Duplicate and rotate the the arc and then use the shape tool to connect the arcs.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #4
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    Oct 2006
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    StPeters, MO USA
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    Default Re: How to draw this shape...

    Quote Originally Posted by gwpriester View Post
    I would create one arc using an equilateral triangle for a guide. Duplicate and rotate the the arc and then use the shape tool to connect the arcs.
    Looks like a good way to me Gary.
    Larry a.k.a wizard509

    Never give up. You will never fail, but you may find a lot of ways that don't work.

  5. #5
    Join Date
    Nov 2006
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    1,602

    Default Re: How to draw this shape...

    Quick shape>triangular shape>ctrl+drag in place>Select polygons+starredshapes+rounded corners
    Drag innermost handles outwards
    Drag corners to create sharp corner
    Drag other side handles towards the corner to create a smoother curve

    Name:  clipimage.jpg
Views: 109
Size:  2.1 KB

  6. #6
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    Default Re: How to draw this shape...

    Hi Rik, leaving aside the many ways to draw it the next problem is:

    So that, if it was turned/spun around its axis, it would still look exactly the same.
    By axis I assume you mean centre. Unfortunately Xara can sometimes miss interprets the centre and this can lead to odd unwanted effects. Xara appears to determine the centre of rotation as a point half the height and half the width. This is very rarely the case.

    I'll expand further should you require
    Egg

    Intel i7 - 4790K Quad Core + 16 GB Ram + NVIDIA Geforce GTX 1660 Graphics Card + MSI Optix Mag321 Curv monitor
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  7. #7
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    Default Re: How to draw this shape...

    Especially true with triangles.

  8. #8
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    Apr 2015
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    Germany
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    Default Re: How to draw this shape...

    Acorn, your method is very simple, quick and precise.

  9. #9
    Join Date
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    Default Re: How to draw this shape...

    Quote Originally Posted by Egg Bramhill View Post
    Hi Rik, leaving aside the many ways to draw it the next problem is:

    By axis I assume you mean centre. Unfortunately Xara can sometimes miss interprets the centre and this can lead to odd unwanted effects. Xara appears to determine the centre of rotation as a point half the height and half the width. This is very rarely the case.

    I'll expand further should you require
    No, Egg.
    You don't have to explain any further. I know exactly what you mean, as the attached pic shows.

    What I was trying to say was that when the shape is turned/spun, all the sides should be exactly the same.

    Click image for larger version. 

Name:	shape centre.png 
Views:	25 
Size:	15.5 KB 
ID:	122238

    Featured Artist on Xara Xone . May 2011
    . A Shield . My First Tutorial
    . Bottle Cap . My Second Tutorial on Xara Xone

  10. #10
    Join Date
    Jun 2009
    Location
    Reading. UK
    Posts
    6,970

    Default Re: How to draw this shape...

    Quote Originally Posted by haakoo View Post
    Quick shape>triangular shape>ctrl+drag in place>Select polygons+starredshapes+rounded corners
    Drag innermost handles outwards
    Drag corners to create sharp corner
    Drag other side handles towards the corner to create a smoother curve

    Name:  clipimage.jpg
Views: 109
Size:  2.1 KB
    Absolutely brilliant.

    Exactly what I was looking for.
    This answer is prize worthy!

    Featured Artist on Xara Xone . May 2011
    . A Shield . My First Tutorial
    . Bottle Cap . My Second Tutorial on Xara Xone

 

 

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