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  1. #1
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    Jul 2007
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    Marlow UK and Puymeras France
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    Default Draw accurate circular arc

    I am sure this must be possible but I can't find it as a forum question or see a simple way to do it...
    To start with I just want to draw a circular arc!
    I am actually trying to illustrate the tracks that would be left by a vehicle making first a 130 deg right and then a 20 deg left turn, so there would be 2 lines with concentric arcs. The actual values for the turns will result from imposing the lines on an aerial photo or plan. Any pointers would be very welcome!

  2. #2
    Join Date
    Aug 2000
    Location
    Placitas, New Mexico, USA
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    Default Re: Draw accurate circular arc

    In the best of all worlds, Xara would have an arc tool. But they don't.


    1. Create a circle to match the tire tracks.
    2. Add an outline and set the fill to none.
    3. Convert to Editable Shapes (Arrange menu)
    4. Select the circle, then the Shape Tool (F4).
    5. Click on the circle at the first place you want to start the arc.
    6. On the Infobar, click Break at Points.
    7. Repeat this step for where you want to end the arc.
    8. Select the portion you are not using and delete.
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    Gary W. Priester
    Mr. Moderator Emeritus Dude
    , Sir

    gwpriester.com | Custom-Stereograms.com | eyeTricks on Facebook






  3. #3
    Join Date
    Oct 2006
    Location
    StPeters, MO USA
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    10,365

    Default Re: Draw accurate circular arc

    Quote Originally Posted by gwpriester View Post
    In the best of all worlds, Xara would have an arc tool. But they don't.


    1. Create a circle to match the tire tracks.
    2. Add an outline and set the fill to none.
    3. Convert to Editable Shapes (Arrange menu)
    4. Select the circle, then the Shape Tool (F4).
    5. Click on the circle at the first place you want to start the arc.
    6. On the Infobar, click Break at Points.
    7. Repeat this step for where you want to end the arc.
    8. Select the portion you are not using and delete.
    Gary I personally am having difficulty with this I did it of course but how are you setting fill to "none" I can clear the fill but that is as far as I
    can follow your suggestion.




    .
    Larry a.k.a wizard509

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

  4. #4
    Join Date
    Feb 2007
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    UK
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    19,398

    Default Re: Draw accurate circular arc

    larry - the fill tool does not have such a setting, but what gary means is click on 'set no colour' on the colour bar which removes the fill; we all assume things are understood sometimes

    @ slast
    - is this a schematic or realistic... realistic tracks are modified by vehicle inertia/momentum, tyre drag, surface traction....
    -------------------------------
    Wyrd bi ful ard

  5. #5
    Join Date
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    Placitas, New Mexico, USA
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    Default Re: Draw accurate circular arc

    It really does not matter about the fill as long as the circle has an outline. Once you break at a point, the circle is no longer a circle. It is now a line.
    Gary W. Priester
    Mr. Moderator Emeritus Dude
    , Sir

    gwpriester.com | Custom-Stereograms.com | eyeTricks on Facebook






  6. #6
    Join Date
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    UK
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    Default Re: Draw accurate circular arc

    true
    -------------------------------
    Wyrd bi ful ard

  7. #7
    Join Date
    Apr 2012
    Location
    SW England
    Posts
    14,199

    Default Re: Draw accurate circular arc

    Quote Originally Posted by slast View Post
    I am sure this must be possible but I can't find it as a forum question or see a simple way to do it...
    To start with I just want to draw a circular arc!
    I am actually trying to illustrate the tracks that would be left by a vehicle making first a 130 deg right and then a 20 deg left turn, so there would be 2 lines with concentric arcs. The actual values for the turns will result from imposing the lines on an aerial photo or plan. Any pointers would be very welcome!
    What is the steering angle in these curves? This determines the radius.
    You also need to supply the wheelbase and width of the vehicle as well as the speed.

    I don't know if your XDA has the SmartShape Ring Segment where you can drag to 36.1% (130deg) and 5.6% (20deg) for an inner and an outer arc.

    Acorn
    Acorn - installed and active Xara software: Cloud+/Pro+, XDPX, XWD Premium 15 & 12, XPGD10, X3D7, Xara Xtreme 5, back through time (to CC's Artworks).
    Raise software faults with MagiXara: http://support.magix.net/; if Cloud+/Pro+: https://xara.com/contact-us/

  8. #8
    Join Date
    Feb 2007
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    UK
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    19,398

    Default Re: Draw accurate circular arc

    that as well
    -------------------------------
    Wyrd bi ful ard

  9. #9
    Join Date
    Oct 2006
    Location
    StPeters, MO USA
    Posts
    10,365

    Default Re: Draw accurate circular arc

    Quote Originally Posted by handrawn View Post
    larry - the fill tool does not have such a setting, but what gary means is click on 'set no colour' on the colour bar which removes the fill; we all assume things are understood sometimes

    that is exactly what I did, a big thank-you guys I guess I knew more than I thought.
    Larry a.k.a wizard509

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

  10. #10
    Join Date
    Oct 2006
    Location
    StPeters, MO USA
    Posts
    10,365

    Default Re: Draw accurate circular arc

    Quote Originally Posted by gwpriester View Post
    It really does not matter about the fill as long as the circle has an outline. Once you break at a point, the circle is no longer a circle. It is now a line.

    Yeah I knew that too'
    Larry a.k.a wizard509

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

 

 

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